/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp

Bug Summary

File:	llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
Warning:	line 2714, column 62 The result of the right shift is undefined due to shifting by '32', which is greater or equal to the width of type 'unsigned int'

Annotated Source Code

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1//===- AMDGPULegalizerInfo.cpp -----------------------------------*- C++ -*-==//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8/// \file
9/// This file implements the targeting of the Machinelegalizer class for
10/// AMDGPU.
11/// \todo This should be generated by TableGen.
12//===----------------------------------------------------------------------===//

14#include "AMDGPULegalizerInfo.h"

16#include "AMDGPU.h"
17#include "AMDGPUGlobalISelUtils.h"
18#include "AMDGPUInstrInfo.h"
19#include "AMDGPUTargetMachine.h"
20#include "SIMachineFunctionInfo.h"
21#include "llvm/ADT/ScopeExit.h"
22#include "llvm/CodeGen/GlobalISel/LegalizerHelper.h"
23#include "llvm/CodeGen/GlobalISel/MIPatternMatch.h"
24#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
25#include "llvm/IR/DiagnosticInfo.h"
26#include "llvm/IR/IntrinsicsAMDGPU.h"

28#define DEBUG_TYPE"amdgpu-legalinfo" "amdgpu-legalinfo"

30using namespace llvm;
31using namespace LegalizeActions;
32using namespace LegalizeMutations;
33using namespace LegalityPredicates;
34using namespace MIPatternMatch;

36// Hack until load/store selection patterns support any tuple of legal types.
37static cl::opt<bool> EnableNewLegality(
"amdgpu-global-isel-new-legality",
cl::desc("Use GlobalISel desired legality, rather than try to use"
         "rules compatible with selection patterns"),
cl::init(false),
cl::ReallyHidden);

44static constexpr unsigned MaxRegisterSize = 1024;

46// Round the number of elements to the next power of two elements
47static LLT getPow2VectorType(LLT Ty) {
unsigned NElts = Ty.getNumElements();
unsigned Pow2NElts = 1 <<  Log2_32_Ceil(NElts);
return Ty.changeNumElements(Pow2NElts);
51}

53// Round the number of bits to the next power of two bits
54static LLT getPow2ScalarType(LLT Ty) {
unsigned Bits = Ty.getSizeInBits();
unsigned Pow2Bits = 1 <<  Log2_32_Ceil(Bits);
return LLT::scalar(Pow2Bits);
58}

60/// \returs true if this is an odd sized vector which should widen by adding an
61/// additional element. This is mostly to handle <3 x s16> -> <4 x s16>. This
62/// excludes s1 vectors, which should always be scalarized.
63static LegalityPredicate isSmallOddVector(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT Ty = Query.Types[TypeIdx];
  if (!Ty.isVector())
    return false;

  const LLT EltTy = Ty.getElementType();
  const unsigned EltSize = EltTy.getSizeInBits();
  return Ty.getNumElements() % 2 != 0 &&
         EltSize > 1 && EltSize < 32 &&
         Ty.getSizeInBits() % 32 != 0;
};
75}

77static LegalityPredicate sizeIsMultipleOf32(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT Ty = Query.Types[TypeIdx];
  return Ty.getSizeInBits() % 32 == 0;
};
82}

84static LegalityPredicate isWideVec16(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT Ty = Query.Types[TypeIdx];
  const LLT EltTy = Ty.getScalarType();
  return EltTy.getSizeInBits() == 16 && Ty.getNumElements() > 2;
};
90}

92static LegalizeMutation oneMoreElement(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT Ty = Query.Types[TypeIdx];
  const LLT EltTy = Ty.getElementType();
  return std::make_pair(TypeIdx, LLT::vector(Ty.getNumElements() + 1, EltTy));
};
98}

100static LegalizeMutation fewerEltsToSize64Vector(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT Ty = Query.Types[TypeIdx];
  const LLT EltTy = Ty.getElementType();
  unsigned Size = Ty.getSizeInBits();
  unsigned Pieces = (Size + 63) / 64;
  unsigned NewNumElts = (Ty.getNumElements() + 1) / Pieces;
  return std::make_pair(TypeIdx, LLT::scalarOrVector(NewNumElts, EltTy));
};
109}

111// Increase the number of vector elements to reach the next multiple of 32-bit
112// type.
113static LegalizeMutation moreEltsToNext32Bit(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT Ty = Query.Types[TypeIdx];

  const LLT EltTy = Ty.getElementType();
  const int Size = Ty.getSizeInBits();
  const int EltSize = EltTy.getSizeInBits();
  const int NextMul32 = (Size + 31) / 32;

  assert(EltSize < 32)((EltSize < 32) ? static_cast<void> (0) : __assert_fail
 ("EltSize < 32", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 122, __PRETTY_FUNCTION__));

  const int NewNumElts = (32 * NextMul32 + EltSize - 1) / EltSize;
  return std::make_pair(TypeIdx, LLT::vector(NewNumElts, EltTy));
};
127}

129static LLT getBitcastRegisterType(const LLT Ty) {
const unsigned Size = Ty.getSizeInBits();

LLT CoercedTy;
if (Size <= 32) {
  // <2 x s8> -> s16
  // <4 x s8> -> s32
  return LLT::scalar(Size);
}

return LLT::scalarOrVector(Size / 32, 32);
140}

142static LegalizeMutation bitcastToRegisterType(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT Ty = Query.Types[TypeIdx];
  return std::make_pair(TypeIdx, getBitcastRegisterType(Ty));
};
147}

149static LegalizeMutation bitcastToVectorElement32(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT Ty = Query.Types[TypeIdx];
  unsigned Size = Ty.getSizeInBits();
  assert(Size % 32 == 0)((Size % 32 == 0) ? static_cast<void> (0) : __assert_fail
 ("Size % 32 == 0", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 153, __PRETTY_FUNCTION__));
  return std::make_pair(TypeIdx, LLT::scalarOrVector(Size / 32, 32));
};
156}

158static LegalityPredicate vectorSmallerThan(unsigned TypeIdx, unsigned Size) {
return [=](const LegalityQuery &Query) {
  const LLT QueryTy = Query.Types[TypeIdx];
  return QueryTy.isVector() && QueryTy.getSizeInBits() < Size;
};
163}

165static LegalityPredicate vectorWiderThan(unsigned TypeIdx, unsigned Size) {
return [=](const LegalityQuery &Query) {
  const LLT QueryTy = Query.Types[TypeIdx];
  return QueryTy.isVector() && QueryTy.getSizeInBits() > Size;
};
170}

172static LegalityPredicate numElementsNotEven(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT QueryTy = Query.Types[TypeIdx];
  return QueryTy.isVector() && QueryTy.getNumElements() % 2 != 0;
};
177}

179static bool isRegisterSize(unsigned Size) {
return Size % 32 == 0 && Size <= MaxRegisterSize;
181}

183static bool isRegisterVectorElementType(LLT EltTy) {
const int EltSize = EltTy.getSizeInBits();
return EltSize == 16 || EltSize % 32 == 0;
186}

188static bool isRegisterVectorType(LLT Ty) {
const int EltSize = Ty.getElementType().getSizeInBits();
return EltSize == 32 || EltSize == 64 ||
       (EltSize == 16 && Ty.getNumElements() % 2 == 0) ||
       EltSize == 128 || EltSize == 256;
193}

195static bool isRegisterType(LLT Ty) {
if (!isRegisterSize(Ty.getSizeInBits()))
  return false;

if (Ty.isVector())
  return isRegisterVectorType(Ty);

return true;
203}

205// Any combination of 32 or 64-bit elements up the maximum register size, and
206// multiples of v2s16.
207static LegalityPredicate isRegisterType(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  return isRegisterType(Query.Types[TypeIdx]);
};
211}

213static LegalityPredicate elementTypeIsLegal(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT QueryTy = Query.Types[TypeIdx];
  if (!QueryTy.isVector())
    return false;
  const LLT EltTy = QueryTy.getElementType();
  return EltTy == LLT::scalar(16) || EltTy.getSizeInBits() >= 32;
};
221}

223static LegalityPredicate isWideScalarTruncStore(unsigned TypeIdx) {
return [=](const LegalityQuery &Query) {
  const LLT Ty = Query.Types[TypeIdx];
  return !Ty.isVector() && Ty.getSizeInBits() > 32 &&
         Query.MMODescrs[0].SizeInBits < Ty.getSizeInBits();
};
229}

231// TODO: Should load to s16 be legal? Most loads extend to 32-bits, but we
232// handle some operations by just promoting the register during
233// selection. There are also d16 loads on GFX9+ which preserve the high bits.
234static unsigned maxSizeForAddrSpace(const GCNSubtarget &ST, unsigned AS,
                                  bool IsLoad) {
switch (AS) {
case AMDGPUAS::PRIVATE_ADDRESS:
  // FIXME: Private element size.
  return ST.enableFlatScratch() ? 128 : 32;
case AMDGPUAS::LOCAL_ADDRESS:
  return ST.useDS128() ? 128 : 64;
case AMDGPUAS::GLOBAL_ADDRESS:
case AMDGPUAS::CONSTANT_ADDRESS:
case AMDGPUAS::CONSTANT_ADDRESS_32BIT:
  // Treat constant and global as identical. SMRD loads are sometimes usable for
  // global loads (ideally constant address space should be eliminated)
  // depending on the context. Legality cannot be context dependent, but
  // RegBankSelect can split the load as necessary depending on the pointer
  // register bank/uniformity and if the memory is invariant or not written in a
  // kernel.
  return IsLoad ? 512 : 128;
default:
  // Flat addresses may contextually need to be split to 32-bit parts if they
  // may alias scratch depending on the subtarget.
  return 128;
}
257}

259static bool isLoadStoreSizeLegal(const GCNSubtarget &ST,
                               const LegalityQuery &Query,
                               unsigned Opcode) {
const LLT Ty = Query.Types[0];

// Handle G_LOAD, G_ZEXTLOAD, G_SEXTLOAD
const bool IsLoad = Opcode != AMDGPU::G_STORE;

unsigned RegSize = Ty.getSizeInBits();
unsigned MemSize = Query.MMODescrs[0].SizeInBits;
unsigned AlignBits = Query.MMODescrs[0].AlignInBits;
unsigned AS = Query.Types[1].getAddressSpace();

// All of these need to be custom lowered to cast the pointer operand.
if (AS == AMDGPUAS::CONSTANT_ADDRESS_32BIT)
  return false;

// TODO: We should be able to widen loads if the alignment is high enough, but
// we also need to modify the memory access size.
278#if 0
// Accept widening loads based on alignment.
if (IsLoad && MemSize < Size)
  MemSize = std::max(MemSize, Align);
282#endif

// Only 1-byte and 2-byte to 32-bit extloads are valid.
if (MemSize != RegSize && RegSize != 32)
  return false;

if (MemSize > maxSizeForAddrSpace(ST, AS, IsLoad))
  return false;

switch (MemSize) {
case 8:
case 16:
case 32:
case 64:
case 128:
  break;
case 96:
  if (!ST.hasDwordx3LoadStores())
    return false;
  break;
case 256:
case 512:
  // These may contextually need to be broken down.
  break;
default:
  return false;
}

assert(RegSize >= MemSize)((RegSize >= MemSize) ? static_cast<void> (0) : __assert_fail
 ("RegSize >= MemSize", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 310, __PRETTY_FUNCTION__));

if (AlignBits < MemSize) {
  const SITargetLowering *TLI = ST.getTargetLowering();
  if (!TLI->allowsMisalignedMemoryAccessesImpl(MemSize, AS,
                                               Align(AlignBits / 8)))
    return false;
}

return true;
320}

322// The current selector can't handle <6 x s16>, <8 x s16>, s96, s128 etc, so
323// workaround this. Eventually it should ignore the type for loads and only care
324// about the size. Return true in cases where we will workaround this for now by
325// bitcasting.
326static bool loadStoreBitcastWorkaround(const LLT Ty) {
if (EnableNewLegality)
  return false;

const unsigned Size = Ty.getSizeInBits();
if (Size <= 64)
  return false;
if (!Ty.isVector())
  return true;

LLT EltTy = Ty.getElementType();
if (EltTy.isPointer())
  return true;

unsigned EltSize = EltTy.getSizeInBits();
return EltSize != 32 && EltSize != 64;
342}

344static bool isLoadStoreLegal(const GCNSubtarget &ST, const LegalityQuery &Query,
                           unsigned Opcode) {
const LLT Ty = Query.Types[0];
return isRegisterType(Ty) && isLoadStoreSizeLegal(ST, Query, Opcode) &&
       !loadStoreBitcastWorkaround(Ty);
349}

351/// Return true if a load or store of the type should be lowered with a bitcast
352/// to a different type.
353static bool shouldBitcastLoadStoreType(const GCNSubtarget &ST, const LLT Ty,
                                     const unsigned MemSizeInBits) {
const unsigned Size = Ty.getSizeInBits();
  if (Size != MemSizeInBits)
    return Size <= 32 && Ty.isVector();

if (loadStoreBitcastWorkaround(Ty) && isRegisterType(Ty))
  return true;
return Ty.isVector() && (Size <= 32 || isRegisterSize(Size)) &&
       !isRegisterVectorElementType(Ty.getElementType());
363}

365/// Return true if we should legalize a load by widening an odd sized memory
366/// access up to the alignment. Note this case when the memory access itself
367/// changes, not the size of the result register.
368static bool shouldWidenLoad(const GCNSubtarget &ST, unsigned SizeInBits,
                          unsigned AlignInBits, unsigned AddrSpace,
                          unsigned Opcode) {
// We don't want to widen cases that are naturally legal.
if (isPowerOf2_32(SizeInBits))
  return false;

// If we have 96-bit memory operations, we shouldn't touch them. Note we may
// end up widening these for a scalar load during RegBankSelect, since there
// aren't 96-bit scalar loads.
if (SizeInBits == 96 && ST.hasDwordx3LoadStores())
  return false;

if (SizeInBits >= maxSizeForAddrSpace(ST, AddrSpace, Opcode))
  return false;

// A load is known dereferenceable up to the alignment, so it's legal to widen
// to it.
//
// TODO: Could check dereferenceable for less aligned cases.
unsigned RoundedSize = NextPowerOf2(SizeInBits);
if (AlignInBits < RoundedSize)
  return false;

// Do not widen if it would introduce a slow unaligned load.
const SITargetLowering *TLI = ST.getTargetLowering();
bool Fast = false;
return TLI->allowsMisalignedMemoryAccessesImpl(
           RoundedSize, AddrSpace, Align(AlignInBits / 8),
           MachineMemOperand::MOLoad, &Fast) &&
       Fast;
399}

401static bool shouldWidenLoad(const GCNSubtarget &ST, const LegalityQuery &Query,
                          unsigned Opcode) {
if (Query.MMODescrs[0].Ordering != AtomicOrdering::NotAtomic)
  return false;

return shouldWidenLoad(ST, Query.MMODescrs[0].SizeInBits,
                       Query.MMODescrs[0].AlignInBits,
                       Query.Types[1].getAddressSpace(), Opcode);
409}

411AMDGPULegalizerInfo::AMDGPULegalizerInfo(const GCNSubtarget &ST_,
                                       const GCNTargetMachine &TM)
:  ST(ST_) {
using namespace TargetOpcode;

auto GetAddrSpacePtr = [&TM](unsigned AS) {
  return LLT::pointer(AS, TM.getPointerSizeInBits(AS));
};

const LLT S1 = LLT::scalar(1);
const LLT S8 = LLT::scalar(8);
const LLT S16 = LLT::scalar(16);
const LLT S32 = LLT::scalar(32);
const LLT S64 = LLT::scalar(64);
const LLT S128 = LLT::scalar(128);
const LLT S256 = LLT::scalar(256);
const LLT S512 = LLT::scalar(512);
const LLT MaxScalar = LLT::scalar(MaxRegisterSize);

const LLT V2S8 = LLT::vector(2, 8);
const LLT V2S16 = LLT::vector(2, 16);
const LLT V4S16 = LLT::vector(4, 16);

const LLT V2S32 = LLT::vector(2, 32);
const LLT V3S32 = LLT::vector(3, 32);
const LLT V4S32 = LLT::vector(4, 32);
const LLT V5S32 = LLT::vector(5, 32);
const LLT V6S32 = LLT::vector(6, 32);
const LLT V7S32 = LLT::vector(7, 32);
const LLT V8S32 = LLT::vector(8, 32);
const LLT V9S32 = LLT::vector(9, 32);
const LLT V10S32 = LLT::vector(10, 32);
const LLT V11S32 = LLT::vector(11, 32);
const LLT V12S32 = LLT::vector(12, 32);
const LLT V13S32 = LLT::vector(13, 32);
const LLT V14S32 = LLT::vector(14, 32);
const LLT V15S32 = LLT::vector(15, 32);
const LLT V16S32 = LLT::vector(16, 32);
const LLT V32S32 = LLT::vector(32, 32);

const LLT V2S64 = LLT::vector(2, 64);
const LLT V3S64 = LLT::vector(3, 64);
const LLT V4S64 = LLT::vector(4, 64);
const LLT V5S64 = LLT::vector(5, 64);
const LLT V6S64 = LLT::vector(6, 64);
const LLT V7S64 = LLT::vector(7, 64);
const LLT V8S64 = LLT::vector(8, 64);
const LLT V16S64 = LLT::vector(16, 64);

std::initializer_list<LLT> AllS32Vectors =
  {V2S32, V3S32, V4S32, V5S32, V6S32, V7S32, V8S32,
   V9S32, V10S32, V11S32, V12S32, V13S32, V14S32, V15S32, V16S32, V32S32};
std::initializer_list<LLT> AllS64Vectors =
  {V2S64, V3S64, V4S64, V5S64, V6S64, V7S64, V8S64, V16S64};

const LLT GlobalPtr = GetAddrSpacePtr(AMDGPUAS::GLOBAL_ADDRESS);
const LLT ConstantPtr = GetAddrSpacePtr(AMDGPUAS::CONSTANT_ADDRESS);
const LLT Constant32Ptr = GetAddrSpacePtr(AMDGPUAS::CONSTANT_ADDRESS_32BIT);
const LLT LocalPtr = GetAddrSpacePtr(AMDGPUAS::LOCAL_ADDRESS);
const LLT RegionPtr = GetAddrSpacePtr(AMDGPUAS::REGION_ADDRESS);
const LLT FlatPtr = GetAddrSpacePtr(AMDGPUAS::FLAT_ADDRESS);
const LLT PrivatePtr = GetAddrSpacePtr(AMDGPUAS::PRIVATE_ADDRESS);

const LLT CodePtr = FlatPtr;

const std::initializer_list<LLT> AddrSpaces64 = {
  GlobalPtr, ConstantPtr, FlatPtr
};

const std::initializer_list<LLT> AddrSpaces32 = {
  LocalPtr, PrivatePtr, Constant32Ptr, RegionPtr
};

const std::initializer_list<LLT> FPTypesBase = {
  S32, S64
};

const std::initializer_list<LLT> FPTypes16 = {
  S32, S64, S16
};

const std::initializer_list<LLT> FPTypesPK16 = {
  S32, S64, S16, V2S16
};

const LLT MinScalarFPTy = ST.has16BitInsts() ? S16 : S32;

setAction({G_BRCOND, S1}, Legal); // VCC branches
setAction({G_BRCOND, S32}, Legal); // SCC branches

// TODO: All multiples of 32, vectors of pointers, all v2s16 pairs, more
// elements for v3s16
getActionDefinitionsBuilder(G_PHI)
  .legalFor({S32, S64, V2S16, S16, V4S16, S1, S128, S256})
  .legalFor(AllS32Vectors)
  .legalFor(AllS64Vectors)
  .legalFor(AddrSpaces64)
  .legalFor(AddrSpaces32)
  .legalIf(isPointer(0))
  .clampScalar(0, S16, S256)
  .widenScalarToNextPow2(0, 32)
  .clampMaxNumElements(0, S32, 16)
  .moreElementsIf(isSmallOddVector(0), oneMoreElement(0))
  .scalarize(0);

if (ST.hasVOP3PInsts() && ST.hasAddNoCarry() && ST.hasIntClamp()) {
  // Full set of gfx9 features.
  getActionDefinitionsBuilder({G_ADD, G_SUB, G_MUL})
    .legalFor({S32, S16, V2S16})
    .clampScalar(0, S16, S32)
    .clampMaxNumElements(0, S16, 2)
    .scalarize(0)
    .widenScalarToNextPow2(0, 32);

  getActionDefinitionsBuilder({G_UADDSAT, G_USUBSAT, G_SADDSAT, G_SSUBSAT})
    .legalFor({S32, S16, V2S16}) // Clamp modifier
    .minScalarOrElt(0, S16)
    .clampMaxNumElements(0, S16, 2)
    .scalarize(0)
    .widenScalarToNextPow2(0, 32)
    .lower();
} else if (ST.has16BitInsts()) {
  getActionDefinitionsBuilder({G_ADD, G_SUB, G_MUL})
    .legalFor({S32, S16})
    .clampScalar(0, S16, S32)
    .scalarize(0)
    .widenScalarToNextPow2(0, 32); // FIXME: min should be 16

  // Technically the saturating operations require clamp bit support, but this
  // was introduced at the same time as 16-bit operations.
  getActionDefinitionsBuilder({G_UADDSAT, G_USUBSAT})
    .legalFor({S32, S16}) // Clamp modifier
    .minScalar(0, S16)
    .scalarize(0)
    .widenScalarToNextPow2(0, 16)
    .lower();

  // We're just lowering this, but it helps get a better result to try to
  // coerce to the desired type first.
  getActionDefinitionsBuilder({G_SADDSAT, G_SSUBSAT})
    .minScalar(0, S16)
    .scalarize(0)
    .lower();
} else {
  getActionDefinitionsBuilder({G_ADD, G_SUB, G_MUL})
    .legalFor({S32})
    .clampScalar(0, S32, S32)
    .scalarize(0);

  if (ST.hasIntClamp()) {
    getActionDefinitionsBuilder({G_UADDSAT, G_USUBSAT})
      .legalFor({S32}) // Clamp modifier.
      .scalarize(0)
      .minScalarOrElt(0, S32)
      .lower();
  } else {
    // Clamp bit support was added in VI, along with 16-bit operations.
    getActionDefinitionsBuilder({G_UADDSAT, G_USUBSAT})
      .minScalar(0, S32)
      .scalarize(0)
      .lower();
  }

  // FIXME: DAG expansion gets better results. The widening uses the smaller
  // range values and goes for the min/max lowering directly.
  getActionDefinitionsBuilder({G_SADDSAT, G_SSUBSAT})
    .minScalar(0, S32)
    .scalarize(0)
    .lower();
}

getActionDefinitionsBuilder({G_SDIV, G_UDIV, G_SREM, G_UREM})
  .customFor({S32, S64})
  .clampScalar(0, S32, S64)
  .widenScalarToNextPow2(0, 32)
  .scalarize(0);

auto &Mulh = getActionDefinitionsBuilder({G_UMULH, G_SMULH})
                 .legalFor({S32})
                 .maxScalarOrElt(0, S32);

if (ST.hasVOP3PInsts()) {
  Mulh
    .clampMaxNumElements(0, S8, 2)
    .lowerFor({V2S8});
}

Mulh
  .scalarize(0)
  .lower();

// Report legal for any types we can handle anywhere. For the cases only legal
// on the SALU, RegBankSelect will be able to re-legalize.
getActionDefinitionsBuilder({G_AND, G_OR, G_XOR})
  .legalFor({S32, S1, S64, V2S32, S16, V2S16, V4S16})
  .clampScalar(0, S32, S64)
  .moreElementsIf(isSmallOddVector(0), oneMoreElement(0))
  .fewerElementsIf(vectorWiderThan(0, 64), fewerEltsToSize64Vector(0))
  .widenScalarToNextPow2(0)
  .scalarize(0);

getActionDefinitionsBuilder({G_UADDO, G_USUBO,
                             G_UADDE, G_SADDE, G_USUBE, G_SSUBE})
  .legalFor({{S32, S1}, {S32, S32}})
  .minScalar(0, S32)
  // TODO: .scalarize(0)
  .lower();

getActionDefinitionsBuilder(G_BITCAST)
  // Don't worry about the size constraint.
  .legalIf(all(isRegisterType(0), isRegisterType(1)))
  .lower();


getActionDefinitionsBuilder(G_CONSTANT)
  .legalFor({S1, S32, S64, S16, GlobalPtr,
             LocalPtr, ConstantPtr, PrivatePtr, FlatPtr })
  .legalIf(isPointer(0))
  .clampScalar(0, S32, S64)
  .widenScalarToNextPow2(0);

getActionDefinitionsBuilder(G_FCONSTANT)
  .legalFor({S32, S64, S16})
  .clampScalar(0, S16, S64);

getActionDefinitionsBuilder({G_IMPLICIT_DEF, G_FREEZE})
    .legalIf(isRegisterType(0))
    // s1 and s16 are special cases because they have legal operations on
    // them, but don't really occupy registers in the normal way.
    .legalFor({S1, S16})
    .moreElementsIf(isSmallOddVector(0), oneMoreElement(0))
    .clampScalarOrElt(0, S32, MaxScalar)
    .widenScalarToNextPow2(0, 32)
    .clampMaxNumElements(0, S32, 16);

setAction({G_FRAME_INDEX, PrivatePtr}, Legal);

// If the amount is divergent, we have to do a wave reduction to get the
// maximum value, so this is expanded during RegBankSelect.
getActionDefinitionsBuilder(G_DYN_STACKALLOC)
  .legalFor({{PrivatePtr, S32}});

getActionDefinitionsBuilder(G_GLOBAL_VALUE)
  .customIf(typeIsNot(0, PrivatePtr));

setAction({G_BLOCK_ADDR, CodePtr}, Legal);

auto &FPOpActions = getActionDefinitionsBuilder(
  { G_FADD, G_FMUL, G_FMA, G_FCANONICALIZE})
  .legalFor({S32, S64});
auto &TrigActions = getActionDefinitionsBuilder({G_FSIN, G_FCOS})
  .customFor({S32, S64});
auto &FDIVActions = getActionDefinitionsBuilder(G_FDIV)
  .customFor({S32, S64});

if (ST.has16BitInsts()) {
  if (ST.hasVOP3PInsts())
    FPOpActions.legalFor({S16, V2S16});
  else
    FPOpActions.legalFor({S16});

  TrigActions.customFor({S16});
  FDIVActions.customFor({S16});
}

auto &MinNumMaxNum = getActionDefinitionsBuilder({
    G_FMINNUM, G_FMAXNUM, G_FMINNUM_IEEE, G_FMAXNUM_IEEE});

if (ST.hasVOP3PInsts()) {
  MinNumMaxNum.customFor(FPTypesPK16)
    .moreElementsIf(isSmallOddVector(0), oneMoreElement(0))
    .clampMaxNumElements(0, S16, 2)
    .clampScalar(0, S16, S64)
    .scalarize(0);
} else if (ST.has16BitInsts()) {
  MinNumMaxNum.customFor(FPTypes16)
    .clampScalar(0, S16, S64)
    .scalarize(0);
} else {
  MinNumMaxNum.customFor(FPTypesBase)
    .clampScalar(0, S32, S64)
    .scalarize(0);
}

if (ST.hasVOP3PInsts())
  FPOpActions.clampMaxNumElements(0, S16, 2);

FPOpActions
  .scalarize(0)
  .clampScalar(0, ST.has16BitInsts() ? S16 : S32, S64);

TrigActions
  .scalarize(0)
  .clampScalar(0, ST.has16BitInsts() ? S16 : S32, S64);

FDIVActions
  .scalarize(0)
  .clampScalar(0, ST.has16BitInsts() ? S16 : S32, S64);

getActionDefinitionsBuilder({G_FNEG, G_FABS})
  .legalFor(FPTypesPK16)
  .clampMaxNumElements(0, S16, 2)
  .scalarize(0)
  .clampScalar(0, S16, S64);

if (ST.has16BitInsts()) {
  getActionDefinitionsBuilder({G_FSQRT, G_FFLOOR})
    .legalFor({S32, S64, S16})
    .scalarize(0)
    .clampScalar(0, S16, S64);
} else {
  getActionDefinitionsBuilder(G_FSQRT)
    .legalFor({S32, S64})
    .scalarize(0)
    .clampScalar(0, S32, S64);

  if (ST.hasFractBug()) {
    getActionDefinitionsBuilder(G_FFLOOR)
      .customFor({S64})
      .legalFor({S32, S64})
      .scalarize(0)
      .clampScalar(0, S32, S64);
  } else {
    getActionDefinitionsBuilder(G_FFLOOR)
      .legalFor({S32, S64})
      .scalarize(0)
      .clampScalar(0, S32, S64);
  }
}

getActionDefinitionsBuilder(G_FPTRUNC)
  .legalFor({{S32, S64}, {S16, S32}})
  .scalarize(0)
  .lower();

getActionDefinitionsBuilder(G_FPEXT)
  .legalFor({{S64, S32}, {S32, S16}})
  .narrowScalarFor({{S64, S16}}, changeTo(0, S32))
  .scalarize(0);

getActionDefinitionsBuilder(G_FSUB)
    // Use actual fsub instruction
    .legalFor({S32})
    // Must use fadd + fneg
    .lowerFor({S64, S16, V2S16})
    .scalarize(0)
    .clampScalar(0, S32, S64);

// Whether this is legal depends on the floating point mode for the function.
auto &FMad = getActionDefinitionsBuilder(G_FMAD);
if (ST.hasMadF16() && ST.hasMadMacF32Insts())
  FMad.customFor({S32, S16});
else if (ST.hasMadMacF32Insts())
  FMad.customFor({S32});
else if (ST.hasMadF16())
  FMad.customFor({S16});
FMad.scalarize(0)
    .lower();

auto &FRem = getActionDefinitionsBuilder(G_FREM);
if (ST.has16BitInsts()) {
  FRem.customFor({S16, S32, S64});
} else {
  FRem.minScalar(0, S32)
      .customFor({S32, S64});
}
FRem.scalarize(0);

// TODO: Do we need to clamp maximum bitwidth?
getActionDefinitionsBuilder(G_TRUNC)
  .legalIf(isScalar(0))
  .legalFor({{V2S16, V2S32}})
  .clampMaxNumElements(0, S16, 2)
  // Avoid scalarizing in cases that should be truly illegal. In unresolvable
  // situations (like an invalid implicit use), we don't want to infinite loop
  // in the legalizer.
  .fewerElementsIf(elementTypeIsLegal(0), LegalizeMutations::scalarize(0))
  .alwaysLegal();

getActionDefinitionsBuilder({G_SEXT, G_ZEXT, G_ANYEXT})
  .legalFor({{S64, S32}, {S32, S16}, {S64, S16},
             {S32, S1}, {S64, S1}, {S16, S1}})
  .scalarize(0)
  .clampScalar(0, S32, S64)
  .widenScalarToNextPow2(1, 32);

// TODO: Split s1->s64 during regbankselect for VALU.
auto &IToFP = getActionDefinitionsBuilder({G_SITOFP, G_UITOFP})
  .legalFor({{S32, S32}, {S64, S32}, {S16, S32}})
  .lowerFor({{S32, S64}})
  .lowerIf(typeIs(1, S1))
  .customFor({{S64, S64}});
if (ST.has16BitInsts())
  IToFP.legalFor({{S16, S16}});
IToFP.clampScalar(1, S32, S64)
     .minScalar(0, S32)
     .scalarize(0)
     .widenScalarToNextPow2(1);

auto &FPToI = getActionDefinitionsBuilder({G_FPTOSI, G_FPTOUI})
  .legalFor({{S32, S32}, {S32, S64}, {S32, S16}})
  .customFor({{S64, S64}})
  .narrowScalarFor({{S64, S16}}, changeTo(0, S32));
if (ST.has16BitInsts())
  FPToI.legalFor({{S16, S16}});
else
  FPToI.minScalar(1, S32);

FPToI.minScalar(0, S32)
     .scalarize(0)
     .lower();

// Lower roundeven into G_FRINT
getActionDefinitionsBuilder({G_INTRINSIC_ROUND, G_INTRINSIC_ROUNDEVEN})
  .scalarize(0)
  .lower();

if (ST.has16BitInsts()) {
  getActionDefinitionsBuilder({G_INTRINSIC_TRUNC, G_FCEIL, G_FRINT})
    .legalFor({S16, S32, S64})
    .clampScalar(0, S16, S64)
    .scalarize(0);
} else if (ST.getGeneration() >= AMDGPUSubtarget::SEA_ISLANDS) {
  getActionDefinitionsBuilder({G_INTRINSIC_TRUNC, G_FCEIL, G_FRINT})
    .legalFor({S32, S64})
    .clampScalar(0, S32, S64)
    .scalarize(0);
} else {
  getActionDefinitionsBuilder({G_INTRINSIC_TRUNC, G_FCEIL, G_FRINT})
    .legalFor({S32})
    .customFor({S64})
    .clampScalar(0, S32, S64)
    .scalarize(0);
}

getActionDefinitionsBuilder(G_PTR_ADD)
  .legalIf(all(isPointer(0), sameSize(0, 1)))
  .scalarize(0)
  .scalarSameSizeAs(1, 0);

getActionDefinitionsBuilder(G_PTRMASK)
  .legalIf(all(sameSize(0, 1), typeInSet(1, {S64, S32})))
  .scalarSameSizeAs(1, 0)
  .scalarize(0);

auto &CmpBuilder =
  getActionDefinitionsBuilder(G_ICMP)
  // The compare output type differs based on the register bank of the output,
  // so make both s1 and s32 legal.
  //
  // Scalar compares producing output in scc will be promoted to s32, as that
  // is the allocatable register type that will be needed for the copy from
  // scc. This will be promoted during RegBankSelect, and we assume something
  // before that won't try to use s32 result types.
  //
  // Vector compares producing an output in vcc/SGPR will use s1 in VCC reg
  // bank.
  .legalForCartesianProduct(
    {S1}, {S32, S64, GlobalPtr, LocalPtr, ConstantPtr, PrivatePtr, FlatPtr})
  .legalForCartesianProduct(
    {S32}, {S32, S64, GlobalPtr, LocalPtr, ConstantPtr, PrivatePtr, FlatPtr});
if (ST.has16BitInsts()) {
  CmpBuilder.legalFor({{S1, S16}});
}

CmpBuilder
  .widenScalarToNextPow2(1)
  .clampScalar(1, S32, S64)
  .scalarize(0)
  .legalIf(all(typeInSet(0, {S1, S32}), isPointer(1)));

getActionDefinitionsBuilder(G_FCMP)
  .legalForCartesianProduct({S1}, ST.has16BitInsts() ? FPTypes16 : FPTypesBase)
  .widenScalarToNextPow2(1)
  .clampScalar(1, S32, S64)
  .scalarize(0);

// FIXME: fpow has a selection pattern that should move to custom lowering.
auto &Exp2Ops = getActionDefinitionsBuilder({G_FEXP2, G_FLOG2});
if (ST.has16BitInsts())
  Exp2Ops.legalFor({S32, S16});
else
  Exp2Ops.legalFor({S32});
Exp2Ops.clampScalar(0, MinScalarFPTy, S32);
Exp2Ops.scalarize(0);

auto &ExpOps = getActionDefinitionsBuilder({G_FEXP, G_FLOG, G_FLOG10, G_FPOW});
if (ST.has16BitInsts())
  ExpOps.customFor({{S32}, {S16}});
else
  ExpOps.customFor({S32});
ExpOps.clampScalar(0, MinScalarFPTy, S32)
      .scalarize(0);

getActionDefinitionsBuilder(G_FPOWI)
  .clampScalar(0, MinScalarFPTy, S32)
  .lower();

// The 64-bit versions produce 32-bit results, but only on the SALU.
getActionDefinitionsBuilder(G_CTPOP)
  .legalFor({{S32, S32}, {S32, S64}})
  .clampScalar(0, S32, S32)
  .clampScalar(1, S32, S64)
  .scalarize(0)
  .widenScalarToNextPow2(0, 32)
  .widenScalarToNextPow2(1, 32);

// The hardware instructions return a different result on 0 than the generic
// instructions expect. The hardware produces -1, but these produce the
// bitwidth.
getActionDefinitionsBuilder({G_CTLZ, G_CTTZ})
  .scalarize(0)
  .clampScalar(0, S32, S32)
  .clampScalar(1, S32, S64)
  .widenScalarToNextPow2(0, 32)
  .widenScalarToNextPow2(1, 32)
  .lower();

// The 64-bit versions produce 32-bit results, but only on the SALU.
getActionDefinitionsBuilder({G_CTLZ_ZERO_UNDEF, G_CTTZ_ZERO_UNDEF})
  .legalFor({{S32, S32}, {S32, S64}})
  .clampScalar(0, S32, S32)
  .clampScalar(1, S32, S64)
  .scalarize(0)
  .widenScalarToNextPow2(0, 32)
  .widenScalarToNextPow2(1, 32);

getActionDefinitionsBuilder(G_BITREVERSE)
  .legalFor({S32})
  .clampScalar(0, S32, S32)
  .scalarize(0);

if (ST.has16BitInsts()) {
  getActionDefinitionsBuilder(G_BSWAP)
    .legalFor({S16, S32, V2S16})
    .clampMaxNumElements(0, S16, 2)
    // FIXME: Fixing non-power-of-2 before clamp is workaround for
    // narrowScalar limitation.
    .widenScalarToNextPow2(0)
    .clampScalar(0, S16, S32)
    .scalarize(0);

  if (ST.hasVOP3PInsts()) {
    getActionDefinitionsBuilder({G_SMIN, G_SMAX, G_UMIN, G_UMAX})
      .legalFor({S32, S16, V2S16})
      .moreElementsIf(isSmallOddVector(0), oneMoreElement(0))
      .clampMaxNumElements(0, S16, 2)
      .minScalar(0, S16)
      .widenScalarToNextPow2(0)
      .scalarize(0)
      .lower();
  } else {
    getActionDefinitionsBuilder({G_SMIN, G_SMAX, G_UMIN, G_UMAX})
      .legalFor({S32, S16})
      .widenScalarToNextPow2(0)
      .minScalar(0, S16)
      .scalarize(0)
      .lower();
  }
} else {
  // TODO: Should have same legality without v_perm_b32
  getActionDefinitionsBuilder(G_BSWAP)
    .legalFor({S32})
    .lowerIf(scalarNarrowerThan(0, 32))
    // FIXME: Fixing non-power-of-2 before clamp is workaround for
    // narrowScalar limitation.
    .widenScalarToNextPow2(0)
    .maxScalar(0, S32)
    .scalarize(0)
    .lower();

  getActionDefinitionsBuilder({G_SMIN, G_SMAX, G_UMIN, G_UMAX})
    .legalFor({S32})
    .minScalar(0, S32)
    .widenScalarToNextPow2(0)
    .scalarize(0)
    .lower();
}

getActionDefinitionsBuilder(G_INTTOPTR)
  // List the common cases
  .legalForCartesianProduct(AddrSpaces64, {S64})
  .legalForCartesianProduct(AddrSpaces32, {S32})
  .scalarize(0)
  // Accept any address space as long as the size matches
  .legalIf(sameSize(0, 1))
  .widenScalarIf(smallerThan(1, 0),
    [](const LegalityQuery &Query) {
      return std::make_pair(1, LLT::scalar(Query.Types[0].getSizeInBits()));
    })
  .narrowScalarIf(largerThan(1, 0),
    [](const LegalityQuery &Query) {
      return std::make_pair(1, LLT::scalar(Query.Types[0].getSizeInBits()));
    });

getActionDefinitionsBuilder(G_PTRTOINT)
  // List the common cases
  .legalForCartesianProduct(AddrSpaces64, {S64})
  .legalForCartesianProduct(AddrSpaces32, {S32})
  .scalarize(0)
  // Accept any address space as long as the size matches
  .legalIf(sameSize(0, 1))
  .widenScalarIf(smallerThan(0, 1),
    [](const LegalityQuery &Query) {
      return std::make_pair(0, LLT::scalar(Query.Types[1].getSizeInBits()));
    })
  .narrowScalarIf(
    largerThan(0, 1),
    [](const LegalityQuery &Query) {
      return std::make_pair(0, LLT::scalar(Query.Types[1].getSizeInBits()));
    });

getActionDefinitionsBuilder(G_ADDRSPACE_CAST)
  .scalarize(0)
  .custom();

const auto needToSplitMemOp = [=](const LegalityQuery &Query,
                                  bool IsLoad) -> bool {
  const LLT DstTy = Query.Types[0];

  // Split vector extloads.
  unsigned MemSize = Query.MMODescrs[0].SizeInBits;
  unsigned AlignBits = Query.MMODescrs[0].AlignInBits;

  if (MemSize < DstTy.getSizeInBits())
    MemSize = std::max(MemSize, AlignBits);

  if (DstTy.isVector() && DstTy.getSizeInBits() > MemSize)
    return true;

  const LLT PtrTy = Query.Types[1];
  unsigned AS = PtrTy.getAddressSpace();
  if (MemSize > maxSizeForAddrSpace(ST, AS, IsLoad))
    return true;

  // Catch weird sized loads that don't evenly divide into the access sizes
  // TODO: May be able to widen depending on alignment etc.
  unsigned NumRegs = (MemSize + 31) / 32;
  if (NumRegs == 3) {
    if (!ST.hasDwordx3LoadStores())
      return true;
  } else {
    // If the alignment allows, these should have been widened.
    if (!isPowerOf2_32(NumRegs))
      return true;
  }

  if (AlignBits < MemSize) {
    const SITargetLowering *TLI = ST.getTargetLowering();
    return !TLI->allowsMisalignedMemoryAccessesImpl(MemSize, AS,
                                                    Align(AlignBits / 8));
  }

  return false;
};

unsigned GlobalAlign32 = ST.hasUnalignedBufferAccessEnabled() ? 0 : 32;
unsigned GlobalAlign16 = ST.hasUnalignedBufferAccessEnabled() ? 0 : 16;
unsigned GlobalAlign8 = ST.hasUnalignedBufferAccessEnabled() ? 0 : 8;

// TODO: Refine based on subtargets which support unaligned access or 128-bit
// LDS
// TODO: Unsupported flat for SI.

for (unsigned Op : {G_LOAD, G_STORE}) {
  const bool IsStore = Op == G_STORE;

  auto &Actions = getActionDefinitionsBuilder(Op);
  // Explicitly list some common cases.
  // TODO: Does this help compile time at all?
  Actions.legalForTypesWithMemDesc({{S32, GlobalPtr, 32, GlobalAlign32},
                                    {V2S32, GlobalPtr, 64, GlobalAlign32},
                                    {V4S32, GlobalPtr, 128, GlobalAlign32},
                                    {S64, GlobalPtr, 64, GlobalAlign32},
                                    {V2S64, GlobalPtr, 128, GlobalAlign32},
                                    {V2S16, GlobalPtr, 32, GlobalAlign32},
                                    {S32, GlobalPtr, 8, GlobalAlign8},
                                    {S32, GlobalPtr, 16, GlobalAlign16},

                                    {S32, LocalPtr, 32, 32},
                                    {S64, LocalPtr, 64, 32},
                                    {V2S32, LocalPtr, 64, 32},
                                    {S32, LocalPtr, 8, 8},
                                    {S32, LocalPtr, 16, 16},
                                    {V2S16, LocalPtr, 32, 32},

                                    {S32, PrivatePtr, 32, 32},
                                    {S32, PrivatePtr, 8, 8},
                                    {S32, PrivatePtr, 16, 16},
                                    {V2S16, PrivatePtr, 32, 32},

                                    {S32, ConstantPtr, 32, GlobalAlign32},
                                    {V2S32, ConstantPtr, 64, GlobalAlign32},
                                    {V4S32, ConstantPtr, 128, GlobalAlign32},
                                    {S64, ConstantPtr, 64, GlobalAlign32},
                                    {V2S32, ConstantPtr, 32, GlobalAlign32}});
  Actions.legalIf(
    [=](const LegalityQuery &Query) -> bool {
      return isLoadStoreLegal(ST, Query, Op);
    });

  // Constant 32-bit is handled by addrspacecasting the 32-bit pointer to
  // 64-bits.
  //
  // TODO: Should generalize bitcast action into coerce, which will also cover
  // inserting addrspacecasts.
  Actions.customIf(typeIs(1, Constant32Ptr));

  // Turn any illegal element vectors into something easier to deal
  // with. These will ultimately produce 32-bit scalar shifts to extract the
  // parts anyway.
  //
  // For odd 16-bit element vectors, prefer to split those into pieces with
  // 16-bit vector parts.
  Actions.bitcastIf(
    [=](const LegalityQuery &Query) -> bool {
      return shouldBitcastLoadStoreType(ST, Query.Types[0],
                                        Query.MMODescrs[0].SizeInBits);
    }, bitcastToRegisterType(0));

  if (!IsStore) {
    // Widen suitably aligned loads by loading extra bytes. The standard
    // legalization actions can't properly express widening memory operands.
    Actions.customIf([=](const LegalityQuery &Query) -> bool {
      return shouldWidenLoad(ST, Query, G_LOAD);
    });
  }

  // FIXME: load/store narrowing should be moved to lower action
  Actions
      .narrowScalarIf(
          [=](const LegalityQuery &Query) -> bool {
            return !Query.Types[0].isVector() &&
                   needToSplitMemOp(Query, Op == G_LOAD);
          },
          [=](const LegalityQuery &Query) -> std::pair<unsigned, LLT> {
            const LLT DstTy = Query.Types[0];
            const LLT PtrTy = Query.Types[1];

            const unsigned DstSize = DstTy.getSizeInBits();
            unsigned MemSize = Query.MMODescrs[0].SizeInBits;

            // Split extloads.
            if (DstSize > MemSize)
              return std::make_pair(0, LLT::scalar(MemSize));

            if (!isPowerOf2_32(DstSize)) {
              // We're probably decomposing an odd sized store. Try to split
              // to the widest type. TODO: Account for alignment. As-is it
              // should be OK, since the new parts will be further legalized.
              unsigned FloorSize = PowerOf2Floor(DstSize);
              return std::make_pair(0, LLT::scalar(FloorSize));
            }

            if (DstSize > 32 && (DstSize % 32 != 0)) {
              // FIXME: Need a way to specify non-extload of larger size if
              // suitably aligned.
              return std::make_pair(0, LLT::scalar(32 * (DstSize / 32)));
            }

            unsigned MaxSize = maxSizeForAddrSpace(ST,
                                                   PtrTy.getAddressSpace(),
                                                   Op == G_LOAD);
            if (MemSize > MaxSize)
              return std::make_pair(0, LLT::scalar(MaxSize));

            unsigned Align = Query.MMODescrs[0].AlignInBits;
            return std::make_pair(0, LLT::scalar(Align));
          })
      .fewerElementsIf(
          [=](const LegalityQuery &Query) -> bool {
            return Query.Types[0].isVector() &&
                   needToSplitMemOp(Query, Op == G_LOAD);
          },
          [=](const LegalityQuery &Query) -> std::pair<unsigned, LLT> {
            const LLT DstTy = Query.Types[0];
            const LLT PtrTy = Query.Types[1];

            LLT EltTy = DstTy.getElementType();
            unsigned MaxSize = maxSizeForAddrSpace(ST,
                                                   PtrTy.getAddressSpace(),
                                                   Op == G_LOAD);

            // FIXME: Handle widened to power of 2 results better. This ends
            // up scalarizing.
            // FIXME: 3 element stores scalarized on SI

            // Split if it's too large for the address space.
            if (Query.MMODescrs[0].SizeInBits > MaxSize) {
              unsigned NumElts = DstTy.getNumElements();
              unsigned EltSize = EltTy.getSizeInBits();

              if (MaxSize % EltSize == 0) {
                return std::make_pair(
                  0, LLT::scalarOrVector(MaxSize / EltSize, EltTy));
              }

              unsigned NumPieces = Query.MMODescrs[0].SizeInBits / MaxSize;

              // FIXME: Refine when odd breakdowns handled
              // The scalars will need to be re-legalized.
              if (NumPieces == 1 || NumPieces >= NumElts ||
                  NumElts % NumPieces != 0)
                return std::make_pair(0, EltTy);

              return std::make_pair(0,
                                    LLT::vector(NumElts / NumPieces, EltTy));
            }

            // FIXME: We could probably handle weird extending loads better.
            unsigned MemSize = Query.MMODescrs[0].SizeInBits;
            if (DstTy.getSizeInBits() > MemSize)
              return std::make_pair(0, EltTy);

            unsigned EltSize = EltTy.getSizeInBits();
            unsigned DstSize = DstTy.getSizeInBits();
            if (!isPowerOf2_32(DstSize)) {
              // We're probably decomposing an odd sized store. Try to split
              // to the widest type. TODO: Account for alignment. As-is it
              // should be OK, since the new parts will be further legalized.
              unsigned FloorSize = PowerOf2Floor(DstSize);
              return std::make_pair(
                0, LLT::scalarOrVector(FloorSize / EltSize, EltTy));
            }

            // Need to split because of alignment.
            unsigned Align = Query.MMODescrs[0].AlignInBits;
            if (EltSize > Align &&
                (EltSize / Align < DstTy.getNumElements())) {
              return std::make_pair(0, LLT::vector(EltSize / Align, EltTy));
            }

            // May need relegalization for the scalars.
            return std::make_pair(0, EltTy);
          })
  .lowerIfMemSizeNotPow2()
  .minScalar(0, S32);

  if (IsStore)
    Actions.narrowScalarIf(isWideScalarTruncStore(0), changeTo(0, S32));

  Actions
      .widenScalarToNextPow2(0)
      .moreElementsIf(vectorSmallerThan(0, 32), moreEltsToNext32Bit(0))
      .lower();
}

auto &ExtLoads = getActionDefinitionsBuilder({G_SEXTLOAD, G_ZEXTLOAD})
                     .legalForTypesWithMemDesc({{S32, GlobalPtr, 8, 8},
                                                {S32, GlobalPtr, 16, 2 * 8},
                                                {S32, LocalPtr, 8, 8},
                                                {S32, LocalPtr, 16, 16},
                                                {S32, PrivatePtr, 8, 8},
                                                {S32, PrivatePtr, 16, 16},
                                                {S32, ConstantPtr, 8, 8},
                                                {S32, ConstantPtr, 16, 2 * 8}});
if (ST.hasFlatAddressSpace()) {
  ExtLoads.legalForTypesWithMemDesc(
      {{S32, FlatPtr, 8, 8}, {S32, FlatPtr, 16, 16}});
}

ExtLoads.clampScalar(0, S32, S32)
        .widenScalarToNextPow2(0)
        .unsupportedIfMemSizeNotPow2()
        .lower();

auto &Atomics = getActionDefinitionsBuilder(
  {G_ATOMICRMW_XCHG, G_ATOMICRMW_ADD, G_ATOMICRMW_SUB,
   G_ATOMICRMW_AND, G_ATOMICRMW_OR, G_ATOMICRMW_XOR,
   G_ATOMICRMW_MAX, G_ATOMICRMW_MIN, G_ATOMICRMW_UMAX,
   G_ATOMICRMW_UMIN})
  .legalFor({{S32, GlobalPtr}, {S32, LocalPtr},
             {S64, GlobalPtr}, {S64, LocalPtr},
             {S32, RegionPtr}, {S64, RegionPtr}});
if (ST.hasFlatAddressSpace()) {
  Atomics.legalFor({{S32, FlatPtr}, {S64, FlatPtr}});
}

if (ST.hasLDSFPAtomics()) {
  getActionDefinitionsBuilder(G_ATOMICRMW_FADD)
    .legalFor({{S32, LocalPtr}, {S32, RegionPtr}});
}

// BUFFER/FLAT_ATOMIC_CMP_SWAP on GCN GPUs needs input marshalling, and output
// demarshalling
getActionDefinitionsBuilder(G_ATOMIC_CMPXCHG)
  .customFor({{S32, GlobalPtr}, {S64, GlobalPtr},
              {S32, FlatPtr}, {S64, FlatPtr}})
  .legalFor({{S32, LocalPtr}, {S64, LocalPtr},
             {S32, RegionPtr}, {S64, RegionPtr}});
// TODO: Pointer types, any 32-bit or 64-bit vector

// Condition should be s32 for scalar, s1 for vector.
getActionDefinitionsBuilder(G_SELECT)
  .legalForCartesianProduct({S32, S64, S16, V2S32, V2S16, V4S16,
        GlobalPtr, LocalPtr, FlatPtr, PrivatePtr,
        LLT::vector(2, LocalPtr), LLT::vector(2, PrivatePtr)}, {S1, S32})
  .clampScalar(0, S16, S64)
  .scalarize(1)
  .moreElementsIf(isSmallOddVector(0), oneMoreElement(0))
  .fewerElementsIf(numElementsNotEven(0), scalarize(0))
  .clampMaxNumElements(0, S32, 2)
  .clampMaxNumElements(0, LocalPtr, 2)
  .clampMaxNumElements(0, PrivatePtr, 2)
  .scalarize(0)
  .widenScalarToNextPow2(0)
  .legalIf(all(isPointer(0), typeInSet(1, {S1, S32})));

// TODO: Only the low 4/5/6 bits of the shift amount are observed, so we can
// be more flexible with the shift amount type.
auto &Shifts = getActionDefinitionsBuilder({G_SHL, G_LSHR, G_ASHR})
  .legalFor({{S32, S32}, {S64, S32}});
if (ST.has16BitInsts()) {
  if (ST.hasVOP3PInsts()) {
    Shifts.legalFor({{S16, S16}, {V2S16, V2S16}})
          .clampMaxNumElements(0, S16, 2);
  } else
    Shifts.legalFor({{S16, S16}});

  // TODO: Support 16-bit shift amounts for all types
  Shifts.widenScalarIf(
    [=](const LegalityQuery &Query) {
      // Use 16-bit shift amounts for any 16-bit shift. Otherwise we want a
      // 32-bit amount.
      const LLT ValTy = Query.Types[0];
      const LLT AmountTy = Query.Types[1];
      return ValTy.getSizeInBits() <= 16 &&
             AmountTy.getSizeInBits() < 16;
    }, changeTo(1, S16));
  Shifts.maxScalarIf(typeIs(0, S16), 1, S16);
  Shifts.clampScalar(1, S32, S32);
  Shifts.clampScalar(0, S16, S64);
  Shifts.widenScalarToNextPow2(0, 16);

  getActionDefinitionsBuilder({G_SSHLSAT, G_USHLSAT})
    .minScalar(0, S16)
    .scalarize(0)
    .lower();
} else {
  // Make sure we legalize the shift amount type first, as the general
  // expansion for the shifted type will produce much worse code if it hasn't
  // been truncated already.
  Shifts.clampScalar(1, S32, S32);
  Shifts.clampScalar(0, S32, S64);
  Shifts.widenScalarToNextPow2(0, 32);

  getActionDefinitionsBuilder({G_SSHLSAT, G_USHLSAT})
    .minScalar(0, S32)
    .scalarize(0)
    .lower();
}
Shifts.scalarize(0);

for (unsigned Op : {G_EXTRACT_VECTOR_ELT, G_INSERT_VECTOR_ELT}) {
  unsigned VecTypeIdx = Op == G_EXTRACT_VECTOR_ELT ? 1 : 0;
  unsigned EltTypeIdx = Op == G_EXTRACT_VECTOR_ELT ? 0 : 1;
  unsigned IdxTypeIdx = 2;

  getActionDefinitionsBuilder(Op)
    .customIf([=](const LegalityQuery &Query) {
        const LLT EltTy = Query.Types[EltTypeIdx];
        const LLT VecTy = Query.Types[VecTypeIdx];
        const LLT IdxTy = Query.Types[IdxTypeIdx];
        const unsigned EltSize = EltTy.getSizeInBits();
        return (EltSize == 32 || EltSize == 64) &&
                VecTy.getSizeInBits() % 32 == 0 &&
                VecTy.getSizeInBits() <= MaxRegisterSize &&
                IdxTy.getSizeInBits() == 32;
      })
    .bitcastIf(all(sizeIsMultipleOf32(VecTypeIdx), scalarOrEltNarrowerThan(VecTypeIdx, 32)),
               bitcastToVectorElement32(VecTypeIdx))
    //.bitcastIf(vectorSmallerThan(1, 32), bitcastToScalar(1))
    .bitcastIf(
      all(sizeIsMultipleOf32(VecTypeIdx), scalarOrEltWiderThan(VecTypeIdx, 64)),
      [=](const LegalityQuery &Query) {
        // For > 64-bit element types, try to turn this into a 64-bit
        // element vector since we may be able to do better indexing
        // if this is scalar. If not, fall back to 32.
        const LLT EltTy = Query.Types[EltTypeIdx];
        const LLT VecTy = Query.Types[VecTypeIdx];
        const unsigned DstEltSize = EltTy.getSizeInBits();
        const unsigned VecSize = VecTy.getSizeInBits();

        const unsigned TargetEltSize = DstEltSize % 64 == 0 ? 64 : 32;
        return std::make_pair(
          VecTypeIdx, LLT::vector(VecSize / TargetEltSize, TargetEltSize));
      })
    .clampScalar(EltTypeIdx, S32, S64)
    .clampScalar(VecTypeIdx, S32, S64)
    .clampScalar(IdxTypeIdx, S32, S32)
    .clampMaxNumElements(VecTypeIdx, S32, 32)
    // TODO: Clamp elements for 64-bit vectors?
    // It should only be necessary with variable indexes.
    // As a last resort, lower to the stack
    .lower();
}

getActionDefinitionsBuilder(G_EXTRACT_VECTOR_ELT)
  .unsupportedIf([=](const LegalityQuery &Query) {
      const LLT &EltTy = Query.Types[1].getElementType();
      return Query.Types[0] != EltTy;
    });

for (unsigned Op : {G_EXTRACT, G_INSERT}) {
  unsigned BigTyIdx = Op == G_EXTRACT ? 1 : 0;
  unsigned LitTyIdx = Op == G_EXTRACT ? 0 : 1;

  // FIXME: Doesn't handle extract of illegal sizes.
  getActionDefinitionsBuilder(Op)
    .lowerIf(all(typeIs(LitTyIdx, S16), sizeIs(BigTyIdx, 32)))
    // FIXME: Multiples of 16 should not be legal.
    .legalIf([=](const LegalityQuery &Query) {
        const LLT BigTy = Query.Types[BigTyIdx];
        const LLT LitTy = Query.Types[LitTyIdx];
        return (BigTy.getSizeInBits() % 32 == 0) &&
               (LitTy.getSizeInBits() % 16 == 0);
      })
    .widenScalarIf(
      [=](const LegalityQuery &Query) {
        const LLT BigTy = Query.Types[BigTyIdx];
        return (BigTy.getScalarSizeInBits() < 16);
      },
      LegalizeMutations::widenScalarOrEltToNextPow2(BigTyIdx, 16))
    .widenScalarIf(
      [=](const LegalityQuery &Query) {
        const LLT LitTy = Query.Types[LitTyIdx];
        return (LitTy.getScalarSizeInBits() < 16);
      },
      LegalizeMutations::widenScalarOrEltToNextPow2(LitTyIdx, 16))
    .moreElementsIf(isSmallOddVector(BigTyIdx), oneMoreElement(BigTyIdx))
    .widenScalarToNextPow2(BigTyIdx, 32);

}

auto &BuildVector = getActionDefinitionsBuilder(G_BUILD_VECTOR)
  .legalForCartesianProduct(AllS32Vectors, {S32})
  .legalForCartesianProduct(AllS64Vectors, {S64})
  .clampNumElements(0, V16S32, V32S32)
  .clampNumElements(0, V2S64, V16S64)
  .fewerElementsIf(isWideVec16(0), changeTo(0, V2S16));

if (ST.hasScalarPackInsts()) {
  BuildVector
    // FIXME: Should probably widen s1 vectors straight to s32
    .minScalarOrElt(0, S16)
    // Widen source elements and produce a G_BUILD_VECTOR_TRUNC
    .minScalar(1, S32);

  getActionDefinitionsBuilder(G_BUILD_VECTOR_TRUNC)
    .legalFor({V2S16, S32})
    .lower();
  BuildVector.minScalarOrElt(0, S32);
} else {
  BuildVector.customFor({V2S16, S16});
  BuildVector.minScalarOrElt(0, S32);

  getActionDefinitionsBuilder(G_BUILD_VECTOR_TRUNC)
    .customFor({V2S16, S32})
    .lower();
}

BuildVector.legalIf(isRegisterType(0));

// FIXME: Clamp maximum size
getActionDefinitionsBuilder(G_CONCAT_VECTORS)
  .legalIf(all(isRegisterType(0), isRegisterType(1)))
  .clampMaxNumElements(0, S32, 32)
  .clampMaxNumElements(1, S16, 2) // TODO: Make 4?
  .clampMaxNumElements(0, S16, 64);

// TODO: Don't fully scalarize v2s16 pieces? Or combine out thosse
// pre-legalize.
if (ST.hasVOP3PInsts()) {
  getActionDefinitionsBuilder(G_SHUFFLE_VECTOR)
    .customFor({V2S16, V2S16})
    .lower();
} else
  getActionDefinitionsBuilder(G_SHUFFLE_VECTOR).lower();

// Merge/Unmerge
for (unsigned Op : {G_MERGE_VALUES, G_UNMERGE_VALUES}) {
  unsigned BigTyIdx = Op == G_MERGE_VALUES ? 0 : 1;
  unsigned LitTyIdx = Op == G_MERGE_VALUES ? 1 : 0;

  auto notValidElt = [=](const LegalityQuery &Query, unsigned TypeIdx) {
    const LLT Ty = Query.Types[TypeIdx];
    if (Ty.isVector()) {
      const LLT &EltTy = Ty.getElementType();
      if (EltTy.getSizeInBits() < 8 || EltTy.getSizeInBits() > 512)
        return true;
      if (!isPowerOf2_32(EltTy.getSizeInBits()))
        return true;
    }
    return false;
  };

  auto &Builder = getActionDefinitionsBuilder(Op)
    .legalIf(all(isRegisterType(0), isRegisterType(1)))
    .lowerFor({{S16, V2S16}})
    .lowerIf([=](const LegalityQuery &Query) {
        const LLT BigTy = Query.Types[BigTyIdx];
        return BigTy.getSizeInBits() == 32;
      })
    // Try to widen to s16 first for small types.
    // TODO: Only do this on targets with legal s16 shifts
    .minScalarOrEltIf(scalarNarrowerThan(LitTyIdx, 16), LitTyIdx, S16)
    .widenScalarToNextPow2(LitTyIdx, /*Min*/ 16)
    .moreElementsIf(isSmallOddVector(BigTyIdx), oneMoreElement(BigTyIdx))
    .fewerElementsIf(all(typeIs(0, S16), vectorWiderThan(1, 32),
                         elementTypeIs(1, S16)),
                     changeTo(1, V2S16))
    // Clamp the little scalar to s8-s256 and make it a power of 2. It's not
    // worth considering the multiples of 64 since 2*192 and 2*384 are not
    // valid.
    .clampScalar(LitTyIdx, S32, S512)
    .widenScalarToNextPow2(LitTyIdx, /*Min*/ 32)
    // Break up vectors with weird elements into scalars
    .fewerElementsIf(
      [=](const LegalityQuery &Query) { return notValidElt(Query, LitTyIdx); },
      scalarize(0))
    .fewerElementsIf(
      [=](const LegalityQuery &Query) { return notValidElt(Query, BigTyIdx); },
      scalarize(1))
    .clampScalar(BigTyIdx, S32, MaxScalar);

  if (Op == G_MERGE_VALUES) {
    Builder.widenScalarIf(
      // TODO: Use 16-bit shifts if legal for 8-bit values?
      [=](const LegalityQuery &Query) {
        const LLT Ty = Query.Types[LitTyIdx];
        return Ty.getSizeInBits() < 32;
      },
      changeTo(LitTyIdx, S32));
  }

  Builder.widenScalarIf(
    [=](const LegalityQuery &Query) {
      const LLT Ty = Query.Types[BigTyIdx];
      return !isPowerOf2_32(Ty.getSizeInBits()) &&
        Ty.getSizeInBits() % 16 != 0;
    },
    [=](const LegalityQuery &Query) {
      // Pick the next power of 2, or a multiple of 64 over 128.
      // Whichever is smaller.
      const LLT &Ty = Query.Types[BigTyIdx];
      unsigned NewSizeInBits = 1 << Log2_32_Ceil(Ty.getSizeInBits() + 1);
      if (NewSizeInBits >= 256) {
        unsigned RoundedTo = alignTo<64>(Ty.getSizeInBits() + 1);
        if (RoundedTo < NewSizeInBits)
          NewSizeInBits = RoundedTo;
      }
      return std::make_pair(BigTyIdx, LLT::scalar(NewSizeInBits));
    })
    // Any vectors left are the wrong size. Scalarize them.
    .scalarize(0)
    .scalarize(1);
}

// S64 is only legal on SALU, and needs to be broken into 32-bit elements in
// RegBankSelect.
auto &SextInReg = getActionDefinitionsBuilder(G_SEXT_INREG)
  .legalFor({{S32}, {S64}});

if (ST.hasVOP3PInsts()) {
  SextInReg.lowerFor({{V2S16}})
    // Prefer to reduce vector widths for 16-bit vectors before lowering, to
    // get more vector shift opportunities, since we'll get those when
    // expanded.
    .fewerElementsIf(elementTypeIs(0, S16), changeTo(0, V2S16));
} else if (ST.has16BitInsts()) {
  SextInReg.lowerFor({{S32}, {S64}, {S16}});
} else {
  // Prefer to promote to s32 before lowering if we don't have 16-bit
  // shifts. This avoid a lot of intermediate truncate and extend operations.
  SextInReg.lowerFor({{S32}, {S64}});
}

SextInReg
  .scalarize(0)
  .clampScalar(0, S32, S64)
  .lower();

getActionDefinitionsBuilder(G_FSHR)
  .legalFor({{S32, S32}})
  .scalarize(0)
  .lower();

getActionDefinitionsBuilder(G_READCYCLECOUNTER)
  .legalFor({S64});

getActionDefinitionsBuilder(G_FENCE)
  .alwaysLegal();

getActionDefinitionsBuilder({
    // TODO: Verify V_BFI_B32 is generated from expanded bit ops
    G_FCOPYSIGN,

    G_ATOMIC_CMPXCHG_WITH_SUCCESS,
    G_ATOMICRMW_NAND,
    G_ATOMICRMW_FSUB,
    G_READ_REGISTER,
    G_WRITE_REGISTER,

    G_SADDO, G_SSUBO,

     // TODO: Implement
    G_FMINIMUM, G_FMAXIMUM,
    G_FSHL
  }).lower();

getActionDefinitionsBuilder({G_VASTART, G_VAARG, G_BRJT, G_JUMP_TABLE,
      G_INDEXED_LOAD, G_INDEXED_SEXTLOAD,
      G_INDEXED_ZEXTLOAD, G_INDEXED_STORE})
  .unsupported();

computeTables();
verify(*ST.getInstrInfo());
1628}

1630bool AMDGPULegalizerInfo::legalizeCustom(LegalizerHelper &Helper,
                                       MachineInstr &MI) const {
MachineIRBuilder &B = Helper.MIRBuilder;
MachineRegisterInfo &MRI = *B.getMRI();

switch (MI.getOpcode()) {
case TargetOpcode::G_ADDRSPACE_CAST:
  return legalizeAddrSpaceCast(MI, MRI, B);
case TargetOpcode::G_FRINT:
  return legalizeFrint(MI, MRI, B);
case TargetOpcode::G_FCEIL:
  return legalizeFceil(MI, MRI, B);
case TargetOpcode::G_FREM:
  return legalizeFrem(MI, MRI, B);
case TargetOpcode::G_INTRINSIC_TRUNC:
  return legalizeIntrinsicTrunc(MI, MRI, B);
case TargetOpcode::G_SITOFP:
  return legalizeITOFP(MI, MRI, B, true);
case TargetOpcode::G_UITOFP:
  return legalizeITOFP(MI, MRI, B, false);
case TargetOpcode::G_FPTOSI:
  return legalizeFPTOI(MI, MRI, B, true);
case TargetOpcode::G_FPTOUI:
  return legalizeFPTOI(MI, MRI, B, false);
case TargetOpcode::G_FMINNUM:
case TargetOpcode::G_FMAXNUM:
case TargetOpcode::G_FMINNUM_IEEE:
case TargetOpcode::G_FMAXNUM_IEEE:
  return legalizeMinNumMaxNum(Helper, MI);
case TargetOpcode::G_EXTRACT_VECTOR_ELT:
  return legalizeExtractVectorElt(MI, MRI, B);
case TargetOpcode::G_INSERT_VECTOR_ELT:
  return legalizeInsertVectorElt(MI, MRI, B);
case TargetOpcode::G_SHUFFLE_VECTOR:
  return legalizeShuffleVector(MI, MRI, B);
case TargetOpcode::G_FSIN:
case TargetOpcode::G_FCOS:
  return legalizeSinCos(MI, MRI, B);
case TargetOpcode::G_GLOBAL_VALUE:
  return legalizeGlobalValue(MI, MRI, B);
case TargetOpcode::G_LOAD:
  return legalizeLoad(Helper, MI);
case TargetOpcode::G_FMAD:
  return legalizeFMad(MI, MRI, B);
case TargetOpcode::G_FDIV:
  return legalizeFDIV(MI, MRI, B);
case TargetOpcode::G_UDIV:
case TargetOpcode::G_UREM:
  return legalizeUDIV_UREM(MI, MRI, B);
case TargetOpcode::G_SDIV:
case TargetOpcode::G_SREM:
  return legalizeSDIV_SREM(MI, MRI, B);
case TargetOpcode::G_ATOMIC_CMPXCHG:
  return legalizeAtomicCmpXChg(MI, MRI, B);
case TargetOpcode::G_FLOG:
  return legalizeFlog(MI, B, numbers::ln2f);
case TargetOpcode::G_FLOG10:
  return legalizeFlog(MI, B, numbers::ln2f / numbers::ln10f);
case TargetOpcode::G_FEXP:
  return legalizeFExp(MI, B);
case TargetOpcode::G_FPOW:
  return legalizeFPow(MI, B);
case TargetOpcode::G_FFLOOR:
  return legalizeFFloor(MI, MRI, B);
case TargetOpcode::G_BUILD_VECTOR:
  return legalizeBuildVector(MI, MRI, B);
default:
  return false;
}

llvm_unreachable("expected switch to return")::llvm::llvm_unreachable_internal("expected switch to return"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 1700);
1701}

1703Register AMDGPULegalizerInfo::getSegmentAperture(
unsigned AS,
MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {
MachineFunction &MF = B.getMF();
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
const LLT S32 = LLT::scalar(32);

assert(AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::PRIVATE_ADDRESS)((AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::PRIVATE_ADDRESS
) ? static_cast<void> (0) : __assert_fail ("AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::PRIVATE_ADDRESS"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 1711, __PRETTY_FUNCTION__));

if (ST.hasApertureRegs()) {
  // FIXME: Use inline constants (src_{shared, private}_base) instead of
  // getreg.
  unsigned Offset = AS == AMDGPUAS::LOCAL_ADDRESS ?
      AMDGPU::Hwreg::OFFSET_SRC_SHARED_BASE :
      AMDGPU::Hwreg::OFFSET_SRC_PRIVATE_BASE;
  unsigned WidthM1 = AS == AMDGPUAS::LOCAL_ADDRESS ?
      AMDGPU::Hwreg::WIDTH_M1_SRC_SHARED_BASE :
      AMDGPU::Hwreg::WIDTH_M1_SRC_PRIVATE_BASE;
  unsigned Encoding =
      AMDGPU::Hwreg::ID_MEM_BASES << AMDGPU::Hwreg::ID_SHIFT_ |
      Offset << AMDGPU::Hwreg::OFFSET_SHIFT_ |
      WidthM1 << AMDGPU::Hwreg::WIDTH_M1_SHIFT_;

  Register GetReg = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass);

  B.buildInstr(AMDGPU::S_GETREG_B32)
    .addDef(GetReg)
    .addImm(Encoding);
  MRI.setType(GetReg, S32);

  auto ShiftAmt = B.buildConstant(S32, WidthM1 + 1);
  return B.buildShl(S32, GetReg, ShiftAmt).getReg(0);
}

Register QueuePtr = MRI.createGenericVirtualRegister(
  LLT::pointer(AMDGPUAS::CONSTANT_ADDRESS, 64));

if (!loadInputValue(QueuePtr, B, AMDGPUFunctionArgInfo::QUEUE_PTR))
  return Register();

// Offset into amd_queue_t for group_segment_aperture_base_hi /
// private_segment_aperture_base_hi.
uint32_t StructOffset = (AS == AMDGPUAS::LOCAL_ADDRESS) ? 0x40 : 0x44;

// TODO: can we be smarter about machine pointer info?
MachinePointerInfo PtrInfo(AMDGPUAS::CONSTANT_ADDRESS);
MachineMemOperand *MMO = MF.getMachineMemOperand(
    PtrInfo,
    MachineMemOperand::MOLoad | MachineMemOperand::MODereferenceable |
        MachineMemOperand::MOInvariant,
    4, commonAlignment(Align(64), StructOffset));

Register LoadAddr;

B.materializePtrAdd(LoadAddr, QueuePtr, LLT::scalar(64), StructOffset);
return B.buildLoad(S32, LoadAddr, *MMO).getReg(0);
1760}

1762bool AMDGPULegalizerInfo::legalizeAddrSpaceCast(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {
MachineFunction &MF = B.getMF();

const LLT S32 = LLT::scalar(32);
Register Dst = MI.getOperand(0).getReg();
Register Src = MI.getOperand(1).getReg();

LLT DstTy = MRI.getType(Dst);
LLT SrcTy = MRI.getType(Src);
unsigned DestAS = DstTy.getAddressSpace();
unsigned SrcAS = SrcTy.getAddressSpace();

// TODO: Avoid reloading from the queue ptr for each cast, or at least each
// vector element.
assert(!DstTy.isVector())((!DstTy.isVector()) ? static_cast<void> (0) : __assert_fail
 ("!DstTy.isVector()", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 1778, __PRETTY_FUNCTION__));

const AMDGPUTargetMachine &TM
  = static_cast<const AMDGPUTargetMachine &>(MF.getTarget());

if (TM.isNoopAddrSpaceCast(SrcAS, DestAS)) {
  MI.setDesc(B.getTII().get(TargetOpcode::G_BITCAST));
  return true;
}

if (DestAS == AMDGPUAS::CONSTANT_ADDRESS_32BIT) {
  // Truncate.
  B.buildExtract(Dst, Src, 0);
  MI.eraseFromParent();
  return true;
}

if (SrcAS == AMDGPUAS::CONSTANT_ADDRESS_32BIT) {
  const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
  uint32_t AddrHiVal = Info->get32BitAddressHighBits();

  // FIXME: This is a bit ugly due to creating a merge of 2 pointers to
  // another. Merge operands are required to be the same type, but creating an
  // extra ptrtoint would be kind of pointless.
  auto HighAddr = B.buildConstant(
    LLT::pointer(AMDGPUAS::CONSTANT_ADDRESS_32BIT, 32), AddrHiVal);
  B.buildMerge(Dst, {Src, HighAddr});
  MI.eraseFromParent();
  return true;
}

if (SrcAS == AMDGPUAS::FLAT_ADDRESS) {
  assert(DestAS == AMDGPUAS::LOCAL_ADDRESS ||((DestAS == AMDGPUAS::LOCAL_ADDRESS || DestAS == AMDGPUAS::PRIVATE_ADDRESS
) ? static_cast<void> (0) : __assert_fail ("DestAS == AMDGPUAS::LOCAL_ADDRESS || DestAS == AMDGPUAS::PRIVATE_ADDRESS"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 1811, __PRETTY_FUNCTION__))
         DestAS == AMDGPUAS::PRIVATE_ADDRESS)((DestAS == AMDGPUAS::LOCAL_ADDRESS || DestAS == AMDGPUAS::PRIVATE_ADDRESS
) ? static_cast<void> (0) : __assert_fail ("DestAS == AMDGPUAS::LOCAL_ADDRESS || DestAS == AMDGPUAS::PRIVATE_ADDRESS"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 1811, __PRETTY_FUNCTION__));
  unsigned NullVal = TM.getNullPointerValue(DestAS);

  auto SegmentNull = B.buildConstant(DstTy, NullVal);
  auto FlatNull = B.buildConstant(SrcTy, 0);

  // Extract low 32-bits of the pointer.
  auto PtrLo32 = B.buildExtract(DstTy, Src, 0);

  auto CmpRes =
      B.buildICmp(CmpInst::ICMP_NE, LLT::scalar(1), Src, FlatNull.getReg(0));
  B.buildSelect(Dst, CmpRes, PtrLo32, SegmentNull.getReg(0));

  MI.eraseFromParent();
  return true;
}

if (SrcAS != AMDGPUAS::LOCAL_ADDRESS && SrcAS != AMDGPUAS::PRIVATE_ADDRESS)
  return false;

if (!ST.hasFlatAddressSpace())
  return false;

auto SegmentNull =
    B.buildConstant(SrcTy, TM.getNullPointerValue(SrcAS));
auto FlatNull =
    B.buildConstant(DstTy, TM.getNullPointerValue(DestAS));

Register ApertureReg = getSegmentAperture(SrcAS, MRI, B);
if (!ApertureReg.isValid())
  return false;

auto CmpRes =
    B.buildICmp(CmpInst::ICMP_NE, LLT::scalar(1), Src, SegmentNull.getReg(0));

// Coerce the type of the low half of the result so we can use merge_values.
Register SrcAsInt = B.buildPtrToInt(S32, Src).getReg(0);

// TODO: Should we allow mismatched types but matching sizes in merges to
// avoid the ptrtoint?
auto BuildPtr = B.buildMerge(DstTy, {SrcAsInt, ApertureReg});
B.buildSelect(Dst, CmpRes, BuildPtr, FlatNull);

MI.eraseFromParent();
return true;
1856}

1858bool AMDGPULegalizerInfo::legalizeFrint(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {
Register Src = MI.getOperand(1).getReg();
LLT Ty = MRI.getType(Src);
assert(Ty.isScalar() && Ty.getSizeInBits() == 64)((Ty.isScalar() && Ty.getSizeInBits() == 64) ? static_cast
<void> (0) : __assert_fail ("Ty.isScalar() && Ty.getSizeInBits() == 64"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 1863, __PRETTY_FUNCTION__));

APFloat C1Val(APFloat::IEEEdouble(), "0x1.0p+52");
APFloat C2Val(APFloat::IEEEdouble(), "0x1.fffffffffffffp+51");

auto C1 = B.buildFConstant(Ty, C1Val);
auto CopySign = B.buildFCopysign(Ty, C1, Src);

// TODO: Should this propagate fast-math-flags?
auto Tmp1 = B.buildFAdd(Ty, Src, CopySign);
auto Tmp2 = B.buildFSub(Ty, Tmp1, CopySign);

auto C2 = B.buildFConstant(Ty, C2Val);
auto Fabs = B.buildFAbs(Ty, Src);

auto Cond = B.buildFCmp(CmpInst::FCMP_OGT, LLT::scalar(1), Fabs, C2);
B.buildSelect(MI.getOperand(0).getReg(), Cond, Src, Tmp2);
MI.eraseFromParent();
return true;
1882}

1884bool AMDGPULegalizerInfo::legalizeFceil(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {

const LLT S1 = LLT::scalar(1);
const LLT S64 = LLT::scalar(64);

Register Src = MI.getOperand(1).getReg();
assert(MRI.getType(Src) == S64)((MRI.getType(Src) == S64) ? static_cast<void> (0) : __assert_fail
 ("MRI.getType(Src) == S64", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 1892, __PRETTY_FUNCTION__));

// result = trunc(src)
// if (src > 0.0 && src != result)
//   result += 1.0

auto Trunc = B.buildIntrinsicTrunc(S64, Src);

const auto Zero = B.buildFConstant(S64, 0.0);
const auto One = B.buildFConstant(S64, 1.0);
auto Lt0 = B.buildFCmp(CmpInst::FCMP_OGT, S1, Src, Zero);
auto NeTrunc = B.buildFCmp(CmpInst::FCMP_ONE, S1, Src, Trunc);
auto And = B.buildAnd(S1, Lt0, NeTrunc);
auto Add = B.buildSelect(S64, And, One, Zero);

// TODO: Should this propagate fast-math-flags?
B.buildFAdd(MI.getOperand(0).getReg(), Trunc, Add);
return true;
1910}

1912bool AMDGPULegalizerInfo::legalizeFrem(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {
  Register DstReg = MI.getOperand(0).getReg();
  Register Src0Reg = MI.getOperand(1).getReg();
  Register Src1Reg = MI.getOperand(2).getReg();
  auto Flags = MI.getFlags();
  LLT Ty = MRI.getType(DstReg);

  auto Div = B.buildFDiv(Ty, Src0Reg, Src1Reg, Flags);
  auto Trunc = B.buildIntrinsicTrunc(Ty, Div, Flags);
  auto Neg = B.buildFNeg(Ty, Trunc, Flags);
  B.buildFMA(DstReg, Neg, Src1Reg, Src0Reg, Flags);
  MI.eraseFromParent();
  return true;
1927}

1929static MachineInstrBuilder extractF64Exponent(Register Hi,
                                            MachineIRBuilder &B) {
const unsigned FractBits = 52;
const unsigned ExpBits = 11;
LLT S32 = LLT::scalar(32);

auto Const0 = B.buildConstant(S32, FractBits - 32);
auto Const1 = B.buildConstant(S32, ExpBits);

auto ExpPart = B.buildIntrinsic(Intrinsic::amdgcn_ubfe, {S32}, false)
  .addUse(Hi)
  .addUse(Const0.getReg(0))
  .addUse(Const1.getReg(0));

return B.buildSub(S32, ExpPart, B.buildConstant(S32, 1023));
1944}

1946bool AMDGPULegalizerInfo::legalizeIntrinsicTrunc(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {
const LLT S1 = LLT::scalar(1);
const LLT S32 = LLT::scalar(32);
const LLT S64 = LLT::scalar(64);

Register Src = MI.getOperand(1).getReg();
assert(MRI.getType(Src) == S64)((MRI.getType(Src) == S64) ? static_cast<void> (0) : __assert_fail
 ("MRI.getType(Src) == S64", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 1954, __PRETTY_FUNCTION__));

// TODO: Should this use extract since the low half is unused?
auto Unmerge = B.buildUnmerge({S32, S32}, Src);
Register Hi = Unmerge.getReg(1);

// Extract the upper half, since this is where we will find the sign and
// exponent.
auto Exp = extractF64Exponent(Hi, B);

const unsigned FractBits = 52;

// Extract the sign bit.
const auto SignBitMask = B.buildConstant(S32, UINT32_C(1)1U << 31);
auto SignBit = B.buildAnd(S32, Hi, SignBitMask);

const auto FractMask = B.buildConstant(S64, (UINT64_C(1)1UL << FractBits) - 1);

const auto Zero32 = B.buildConstant(S32, 0);

// Extend back to 64-bits.
auto SignBit64 = B.buildMerge(S64, {Zero32, SignBit});

auto Shr = B.buildAShr(S64, FractMask, Exp);
auto Not = B.buildNot(S64, Shr);
auto Tmp0 = B.buildAnd(S64, Src, Not);
auto FiftyOne = B.buildConstant(S32, FractBits - 1);

auto ExpLt0 = B.buildICmp(CmpInst::ICMP_SLT, S1, Exp, Zero32);
auto ExpGt51 = B.buildICmp(CmpInst::ICMP_SGT, S1, Exp, FiftyOne);

auto Tmp1 = B.buildSelect(S64, ExpLt0, SignBit64, Tmp0);
B.buildSelect(MI.getOperand(0).getReg(), ExpGt51, Src, Tmp1);
MI.eraseFromParent();
return true;
1989}

1991bool AMDGPULegalizerInfo::legalizeITOFP(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B, bool Signed) const {

Register Dst = MI.getOperand(0).getReg();
Register Src = MI.getOperand(1).getReg();

const LLT S64 = LLT::scalar(64);
const LLT S32 = LLT::scalar(32);

assert(MRI.getType(Src) == S64 && MRI.getType(Dst) == S64)((MRI.getType(Src) == S64 && MRI.getType(Dst) == S64)
 ? static_cast<void> (0) : __assert_fail ("MRI.getType(Src) == S64 && MRI.getType(Dst) == S64"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2001, __PRETTY_FUNCTION__));

auto Unmerge = B.buildUnmerge({S32, S32}, Src);

auto CvtHi = Signed ?
  B.buildSITOFP(S64, Unmerge.getReg(1)) :
  B.buildUITOFP(S64, Unmerge.getReg(1));

auto CvtLo = B.buildUITOFP(S64, Unmerge.getReg(0));

auto ThirtyTwo = B.buildConstant(S32, 32);
auto LdExp = B.buildIntrinsic(Intrinsic::amdgcn_ldexp, {S64}, false)
  .addUse(CvtHi.getReg(0))
  .addUse(ThirtyTwo.getReg(0));

// TODO: Should this propagate fast-math-flags?
B.buildFAdd(Dst, LdExp, CvtLo);
MI.eraseFromParent();
return true;
2020}

2022// TODO: Copied from DAG implementation. Verify logic and document how this
2023// actually works.
2024bool AMDGPULegalizerInfo::legalizeFPTOI(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B, bool Signed) const {

Register Dst = MI.getOperand(0).getReg();
Register Src = MI.getOperand(1).getReg();

const LLT S64 = LLT::scalar(64);
const LLT S32 = LLT::scalar(32);

assert(MRI.getType(Src) == S64 && MRI.getType(Dst) == S64)((MRI.getType(Src) == S64 && MRI.getType(Dst) == S64)
 ? static_cast<void> (0) : __assert_fail ("MRI.getType(Src) == S64 && MRI.getType(Dst) == S64"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2034, __PRETTY_FUNCTION__));

unsigned Flags = MI.getFlags();

auto Trunc = B.buildIntrinsicTrunc(S64, Src, Flags);
auto K0 = B.buildFConstant(S64, BitsToDouble(UINT64_C(0x3df0000000000000)0x3df0000000000000UL));
auto K1 = B.buildFConstant(S64, BitsToDouble(UINT64_C(0xc1f0000000000000)0xc1f0000000000000UL));

auto Mul = B.buildFMul(S64, Trunc, K0, Flags);
auto FloorMul = B.buildFFloor(S64, Mul, Flags);
auto Fma = B.buildFMA(S64, FloorMul, K1, Trunc, Flags);

auto Hi = Signed ?
  B.buildFPTOSI(S32, FloorMul) :
  B.buildFPTOUI(S32, FloorMul);
auto Lo = B.buildFPTOUI(S32, Fma);

B.buildMerge(Dst, { Lo, Hi });
MI.eraseFromParent();

return true;
2055}

2057bool AMDGPULegalizerInfo::legalizeMinNumMaxNum(LegalizerHelper &Helper,
                                             MachineInstr &MI) const {
MachineFunction &MF = Helper.MIRBuilder.getMF();
const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();

const bool IsIEEEOp = MI.getOpcode() == AMDGPU::G_FMINNUM_IEEE ||
                      MI.getOpcode() == AMDGPU::G_FMAXNUM_IEEE;

// With ieee_mode disabled, the instructions have the correct behavior
// already for G_FMINNUM/G_FMAXNUM
if (!MFI->getMode().IEEE)
  return !IsIEEEOp;

if (IsIEEEOp)
  return true;

return Helper.lowerFMinNumMaxNum(MI) == LegalizerHelper::Legalized;
2074}

2076bool AMDGPULegalizerInfo::legalizeExtractVectorElt(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {
// TODO: Should move some of this into LegalizerHelper.

// TODO: Promote dynamic indexing of s16 to s32

// FIXME: Artifact combiner probably should have replaced the truncated
// constant before this, so we shouldn't need
// getConstantVRegValWithLookThrough.
Optional<ValueAndVReg> MaybeIdxVal =
    getConstantVRegValWithLookThrough(MI.getOperand(2).getReg(), MRI);
if (!MaybeIdxVal) // Dynamic case will be selected to register indexing.
  return true;
const int64_t IdxVal = MaybeIdxVal->Value.getSExtValue();

Register Dst = MI.getOperand(0).getReg();
Register Vec = MI.getOperand(1).getReg();

LLT VecTy = MRI.getType(Vec);
LLT EltTy = VecTy.getElementType();
assert(EltTy == MRI.getType(Dst))((EltTy == MRI.getType(Dst)) ? static_cast<void> (0) : __assert_fail
 ("EltTy == MRI.getType(Dst)", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2097, __PRETTY_FUNCTION__));

if (IdxVal < VecTy.getNumElements())
  B.buildExtract(Dst, Vec, IdxVal * EltTy.getSizeInBits());
else
  B.buildUndef(Dst);

MI.eraseFromParent();
return true;
2106}

2108bool AMDGPULegalizerInfo::legalizeInsertVectorElt(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {
// TODO: Should move some of this into LegalizerHelper.

// TODO: Promote dynamic indexing of s16 to s32

// FIXME: Artifact combiner probably should have replaced the truncated
// constant before this, so we shouldn't need
// getConstantVRegValWithLookThrough.
Optional<ValueAndVReg> MaybeIdxVal =
    getConstantVRegValWithLookThrough(MI.getOperand(3).getReg(), MRI);
if (!MaybeIdxVal) // Dynamic case will be selected to register indexing.
  return true;

int64_t IdxVal = MaybeIdxVal->Value.getSExtValue();
Register Dst = MI.getOperand(0).getReg();
Register Vec = MI.getOperand(1).getReg();
Register Ins = MI.getOperand(2).getReg();

LLT VecTy = MRI.getType(Vec);
LLT EltTy = VecTy.getElementType();
assert(EltTy == MRI.getType(Ins))((EltTy == MRI.getType(Ins)) ? static_cast<void> (0) : __assert_fail
 ("EltTy == MRI.getType(Ins)", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2130, __PRETTY_FUNCTION__));

if (IdxVal < VecTy.getNumElements())
  B.buildInsert(Dst, Vec, Ins, IdxVal * EltTy.getSizeInBits());
else
  B.buildUndef(Dst);

MI.eraseFromParent();
return true;
2139}

2141bool AMDGPULegalizerInfo::legalizeShuffleVector(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {
const LLT V2S16 = LLT::vector(2, 16);

Register Dst = MI.getOperand(0).getReg();
Register Src0 = MI.getOperand(1).getReg();
LLT DstTy = MRI.getType(Dst);
LLT SrcTy = MRI.getType(Src0);

if (SrcTy == V2S16 && DstTy == V2S16 &&
    AMDGPU::isLegalVOP3PShuffleMask(MI.getOperand(3).getShuffleMask()))
  return true;

MachineIRBuilder HelperBuilder(MI);
GISelObserverWrapper DummyObserver;
LegalizerHelper Helper(B.getMF(), DummyObserver, HelperBuilder);
return Helper.lowerShuffleVector(MI) == LegalizerHelper::Legalized;
2159}

2161bool AMDGPULegalizerInfo::legalizeSinCos(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {

Register DstReg = MI.getOperand(0).getReg();
Register SrcReg = MI.getOperand(1).getReg();
LLT Ty = MRI.getType(DstReg);
unsigned Flags = MI.getFlags();

Register TrigVal;
auto OneOver2Pi = B.buildFConstant(Ty, 0.5 * numbers::inv_pi);
if (ST.hasTrigReducedRange()) {
  auto MulVal = B.buildFMul(Ty, SrcReg, OneOver2Pi, Flags);
  TrigVal = B.buildIntrinsic(Intrinsic::amdgcn_fract, {Ty}, false)
    .addUse(MulVal.getReg(0))
    .setMIFlags(Flags).getReg(0);
} else
  TrigVal = B.buildFMul(Ty, SrcReg, OneOver2Pi, Flags).getReg(0);

Intrinsic::ID TrigIntrin = MI.getOpcode() == AMDGPU::G_FSIN ?
  Intrinsic::amdgcn_sin : Intrinsic::amdgcn_cos;
B.buildIntrinsic(TrigIntrin, makeArrayRef<Register>(DstReg), false)
  .addUse(TrigVal)
  .setMIFlags(Flags);
MI.eraseFromParent();
return true;
2187}

2189bool AMDGPULegalizerInfo::buildPCRelGlobalAddress(Register DstReg, LLT PtrTy,
                                                MachineIRBuilder &B,
                                                const GlobalValue *GV,
                                                int64_t Offset,
                                                unsigned GAFlags) const {
assert(isInt<32>(Offset + 4) && "32-bit offset is expected!")((isInt<32>(Offset + 4) && "32-bit offset is expected!"
) ? static_cast<void> (0) : __assert_fail ("isInt<32>(Offset + 4) && \"32-bit offset is expected!\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2194, __PRETTY_FUNCTION__));
// In order to support pc-relative addressing, SI_PC_ADD_REL_OFFSET is lowered
// to the following code sequence:
//
// For constant address space:
//   s_getpc_b64 s[0:1]
//   s_add_u32 s0, s0, $symbol
//   s_addc_u32 s1, s1, 0
//
//   s_getpc_b64 returns the address of the s_add_u32 instruction and then
//   a fixup or relocation is emitted to replace $symbol with a literal
//   constant, which is a pc-relative offset from the encoding of the $symbol
//   operand to the global variable.
//
// For global address space:
//   s_getpc_b64 s[0:1]
//   s_add_u32 s0, s0, $symbol@{gotpc}rel32@lo
//   s_addc_u32 s1, s1, $symbol@{gotpc}rel32@hi
//
//   s_getpc_b64 returns the address of the s_add_u32 instruction and then
//   fixups or relocations are emitted to replace $symbol@*@lo and
//   $symbol@*@hi with lower 32 bits and higher 32 bits of a literal constant,
//   which is a 64-bit pc-relative offset from the encoding of the $symbol
//   operand to the global variable.
//
// What we want here is an offset from the value returned by s_getpc
// (which is the address of the s_add_u32 instruction) to the global
// variable, but since the encoding of $symbol starts 4 bytes after the start
// of the s_add_u32 instruction, we end up with an offset that is 4 bytes too
// small. This requires us to add 4 to the global variable offset in order to
// compute the correct address. Similarly for the s_addc_u32 instruction, the
// encoding of $symbol starts 12 bytes after the start of the s_add_u32
// instruction.

LLT ConstPtrTy = LLT::pointer(AMDGPUAS::CONSTANT_ADDRESS, 64);

Register PCReg = PtrTy.getSizeInBits() != 32 ? DstReg :
  B.getMRI()->createGenericVirtualRegister(ConstPtrTy);

MachineInstrBuilder MIB = B.buildInstr(AMDGPU::SI_PC_ADD_REL_OFFSET)
  .addDef(PCReg);

MIB.addGlobalAddress(GV, Offset + 4, GAFlags);
if (GAFlags == SIInstrInfo::MO_NONE)
  MIB.addImm(0);
else
  MIB.addGlobalAddress(GV, Offset + 12, GAFlags + 1);

B.getMRI()->setRegClass(PCReg, &AMDGPU::SReg_64RegClass);

if (PtrTy.getSizeInBits() == 32)
  B.buildExtract(DstReg, PCReg, 0);
return true;
}

2249bool AMDGPULegalizerInfo::legalizeGlobalValue(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {
Register DstReg = MI.getOperand(0).getReg();
LLT Ty = MRI.getType(DstReg);
unsigned AS = Ty.getAddressSpace();

const GlobalValue *GV = MI.getOperand(1).getGlobal();
MachineFunction &MF = B.getMF();
SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();

if (AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::REGION_ADDRESS) {
  if (!MFI->isModuleEntryFunction()) {
    const Function &Fn = MF.getFunction();
    DiagnosticInfoUnsupported BadLDSDecl(
      Fn, "local memory global used by non-kernel function", MI.getDebugLoc(),
      DS_Warning);
    Fn.getContext().diagnose(BadLDSDecl);

    // We currently don't have a way to correctly allocate LDS objects that
    // aren't directly associated with a kernel. We do force inlining of
    // functions that use local objects. However, if these dead functions are
    // not eliminated, we don't want a compile time error. Just emit a warning
    // and a trap, since there should be no callable path here.
    B.buildIntrinsic(Intrinsic::trap, ArrayRef<Register>(), true);
    B.buildUndef(DstReg);
    MI.eraseFromParent();
    return true;
  }

  // TODO: We could emit code to handle the initialization somewhere.
  if (!AMDGPUTargetLowering::hasDefinedInitializer(GV)) {
    const SITargetLowering *TLI = ST.getTargetLowering();
    if (!TLI->shouldUseLDSConstAddress(GV)) {
      MI.getOperand(1).setTargetFlags(SIInstrInfo::MO_ABS32_LO);
      return true; // Leave in place;
    }

    if (AS == AMDGPUAS::LOCAL_ADDRESS && GV->hasExternalLinkage()) {
      Type *Ty = GV->getValueType();
      // HIP uses an unsized array `extern __shared__ T s[]` or similar
      // zero-sized type in other languages to declare the dynamic shared
      // memory which size is not known at the compile time. They will be
      // allocated by the runtime and placed directly after the static
      // allocated ones. They all share the same offset.
      if (B.getDataLayout().getTypeAllocSize(Ty).isZero()) {
        // Adjust alignment for that dynamic shared memory array.
        MFI->setDynLDSAlign(B.getDataLayout(), *cast<GlobalVariable>(GV));
        LLT S32 = LLT::scalar(32);
        auto Sz =
            B.buildIntrinsic(Intrinsic::amdgcn_groupstaticsize, {S32}, false);
        B.buildIntToPtr(DstReg, Sz);
        MI.eraseFromParent();
        return true;
      }
    }

    B.buildConstant(
        DstReg,
        MFI->allocateLDSGlobal(B.getDataLayout(), *cast<GlobalVariable>(GV)));
    MI.eraseFromParent();
    return true;
  }

  const Function &Fn = MF.getFunction();
  DiagnosticInfoUnsupported BadInit(
    Fn, "unsupported initializer for address space", MI.getDebugLoc());
  Fn.getContext().diagnose(BadInit);
  return true;
}

const SITargetLowering *TLI = ST.getTargetLowering();

if (TLI->shouldEmitFixup(GV)) {
  buildPCRelGlobalAddress(DstReg, Ty, B, GV, 0);
  MI.eraseFromParent();
  return true;
}

if (TLI->shouldEmitPCReloc(GV)) {
  buildPCRelGlobalAddress(DstReg, Ty, B, GV, 0, SIInstrInfo::MO_REL32);
  MI.eraseFromParent();
  return true;
}

LLT PtrTy = LLT::pointer(AMDGPUAS::CONSTANT_ADDRESS, 64);
Register GOTAddr = MRI.createGenericVirtualRegister(PtrTy);

MachineMemOperand *GOTMMO = MF.getMachineMemOperand(
    MachinePointerInfo::getGOT(MF),
    MachineMemOperand::MOLoad | MachineMemOperand::MODereferenceable |
        MachineMemOperand::MOInvariant,
    8 /*Size*/, Align(8));

buildPCRelGlobalAddress(GOTAddr, PtrTy, B, GV, 0, SIInstrInfo::MO_GOTPCREL32);

if (Ty.getSizeInBits() == 32) {
  // Truncate if this is a 32-bit constant adrdess.
  auto Load = B.buildLoad(PtrTy, GOTAddr, *GOTMMO);
  B.buildExtract(DstReg, Load, 0);
} else
  B.buildLoad(DstReg, GOTAddr, *GOTMMO);

MI.eraseFromParent();
return true;
2354}

2356static LLT widenToNextPowerOf2(LLT Ty) {
if (Ty.isVector())
  return Ty.changeNumElements(PowerOf2Ceil(Ty.getNumElements()));
return LLT::scalar(PowerOf2Ceil(Ty.getSizeInBits()));
2360}

2362bool AMDGPULegalizerInfo::legalizeLoad(LegalizerHelper &Helper,
                                     MachineInstr &MI) const {
MachineIRBuilder &B = Helper.MIRBuilder;
MachineRegisterInfo &MRI = *B.getMRI();
GISelChangeObserver &Observer = Helper.Observer;

Register PtrReg = MI.getOperand(1).getReg();
LLT PtrTy = MRI.getType(PtrReg);
unsigned AddrSpace = PtrTy.getAddressSpace();

if (AddrSpace == AMDGPUAS::CONSTANT_ADDRESS_32BIT) {
  LLT ConstPtr = LLT::pointer(AMDGPUAS::CONSTANT_ADDRESS, 64);
  auto Cast = B.buildAddrSpaceCast(ConstPtr, PtrReg);
  Observer.changingInstr(MI);
  MI.getOperand(1).setReg(Cast.getReg(0));
  Observer.changedInstr(MI);
  return true;
}

Register ValReg = MI.getOperand(0).getReg();
LLT ValTy = MRI.getType(ValReg);

MachineMemOperand *MMO = *MI.memoperands_begin();
const unsigned ValSize = ValTy.getSizeInBits();
const unsigned MemSize = 8 * MMO->getSize();
const Align MemAlign = MMO->getAlign();
const unsigned AlignInBits = 8 * MemAlign.value();

// Widen non-power-of-2 loads to the alignment if needed
if (shouldWidenLoad(ST, MemSize, AlignInBits, AddrSpace, MI.getOpcode())) {
  const unsigned WideMemSize = PowerOf2Ceil(MemSize);

  // This was already the correct extending load result type, so just adjust
  // the memory type.
  if (WideMemSize == ValSize) {
    MachineFunction &MF = B.getMF();

    MachineMemOperand *WideMMO =
        MF.getMachineMemOperand(MMO, 0, WideMemSize / 8);
    Observer.changingInstr(MI);
    MI.setMemRefs(MF, {WideMMO});
    Observer.changedInstr(MI);
    return true;
  }

  // Don't bother handling edge case that should probably never be produced.
  if (ValSize > WideMemSize)
    return false;

  LLT WideTy = widenToNextPowerOf2(ValTy);

  Register WideLoad;
  if (!WideTy.isVector()) {
    WideLoad = B.buildLoadFromOffset(WideTy, PtrReg, *MMO, 0).getReg(0);
    B.buildTrunc(ValReg, WideLoad).getReg(0);
  } else {
    // Extract the subvector.

    if (isRegisterType(ValTy)) {
      // If this a case where G_EXTRACT is legal, use it.
      // (e.g. <3 x s32> -> <4 x s32>)
      WideLoad = B.buildLoadFromOffset(WideTy, PtrReg, *MMO, 0).getReg(0);
      B.buildExtract(ValReg, WideLoad, 0);
    } else {
      // For cases where the widened type isn't a nice register value, unmerge
      // from a widened register (e.g. <3 x s16> -> <4 x s16>)
      B.setInsertPt(B.getMBB(), ++B.getInsertPt());
      WideLoad = Helper.widenWithUnmerge(WideTy, ValReg);
      B.setInsertPt(B.getMBB(), MI.getIterator());
      B.buildLoadFromOffset(WideLoad, PtrReg, *MMO, 0);
    }
  }

  MI.eraseFromParent();
  return true;
}

return false;
2440}

2442bool AMDGPULegalizerInfo::legalizeFMad(
MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &B) const {
LLT Ty = MRI.getType(MI.getOperand(0).getReg());
assert(Ty.isScalar())((Ty.isScalar()) ? static_cast<void> (0) : __assert_fail
 ("Ty.isScalar()", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2446, __PRETTY_FUNCTION__));

MachineFunction &MF = B.getMF();
const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();

// TODO: Always legal with future ftz flag.
// FIXME: Do we need just output?
if (Ty == LLT::scalar(32) && !MFI->getMode().allFP32Denormals())
  return true;
if (Ty == LLT::scalar(16) && !MFI->getMode().allFP64FP16Denormals())
  return true;

MachineIRBuilder HelperBuilder(MI);
GISelObserverWrapper DummyObserver;
LegalizerHelper Helper(MF, DummyObserver, HelperBuilder);
return Helper.lowerFMad(MI) == LegalizerHelper::Legalized;
2462}

2464bool AMDGPULegalizerInfo::legalizeAtomicCmpXChg(
MachineInstr &MI, MachineRegisterInfo &MRI, MachineIRBuilder &B) const {
Register DstReg = MI.getOperand(0).getReg();
Register PtrReg = MI.getOperand(1).getReg();
Register CmpVal = MI.getOperand(2).getReg();
Register NewVal = MI.getOperand(3).getReg();

assert(AMDGPU::isFlatGlobalAddrSpace(MRI.getType(PtrReg).getAddressSpace()) &&((AMDGPU::isFlatGlobalAddrSpace(MRI.getType(PtrReg).getAddressSpace
()) && "this should not have been custom lowered") ? static_cast
<void> (0) : __assert_fail ("AMDGPU::isFlatGlobalAddrSpace(MRI.getType(PtrReg).getAddressSpace()) && \"this should not have been custom lowered\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2472, __PRETTY_FUNCTION__))
       "this should not have been custom lowered")((AMDGPU::isFlatGlobalAddrSpace(MRI.getType(PtrReg).getAddressSpace
()) && "this should not have been custom lowered") ? static_cast
<void> (0) : __assert_fail ("AMDGPU::isFlatGlobalAddrSpace(MRI.getType(PtrReg).getAddressSpace()) && \"this should not have been custom lowered\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2472, __PRETTY_FUNCTION__));

LLT ValTy = MRI.getType(CmpVal);
LLT VecTy = LLT::vector(2, ValTy);

Register PackedVal = B.buildBuildVector(VecTy, { NewVal, CmpVal }).getReg(0);

B.buildInstr(AMDGPU::G_AMDGPU_ATOMIC_CMPXCHG)
  .addDef(DstReg)
  .addUse(PtrReg)
  .addUse(PackedVal)
  .setMemRefs(MI.memoperands());

MI.eraseFromParent();
return true;
2487}

2489bool AMDGPULegalizerInfo::legalizeFlog(
MachineInstr &MI, MachineIRBuilder &B, double Log2BaseInverted) const {
Register Dst = MI.getOperand(0).getReg();
Register Src = MI.getOperand(1).getReg();
LLT Ty = B.getMRI()->getType(Dst);
unsigned Flags = MI.getFlags();

auto Log2Operand = B.buildFLog2(Ty, Src, Flags);
auto Log2BaseInvertedOperand = B.buildFConstant(Ty, Log2BaseInverted);

B.buildFMul(Dst, Log2Operand, Log2BaseInvertedOperand, Flags);
MI.eraseFromParent();
return true;
2502}

2504bool AMDGPULegalizerInfo::legalizeFExp(MachineInstr &MI,
                                     MachineIRBuilder &B) const {
Register Dst = MI.getOperand(0).getReg();
Register Src = MI.getOperand(1).getReg();
unsigned Flags = MI.getFlags();
LLT Ty = B.getMRI()->getType(Dst);

auto K = B.buildFConstant(Ty, numbers::log2e);
auto Mul = B.buildFMul(Ty, Src, K, Flags);
B.buildFExp2(Dst, Mul, Flags);
MI.eraseFromParent();
return true;
2516}

2518bool AMDGPULegalizerInfo::legalizeFPow(MachineInstr &MI,
                                     MachineIRBuilder &B) const {
Register Dst = MI.getOperand(0).getReg();
Register Src0 = MI.getOperand(1).getReg();
Register Src1 = MI.getOperand(2).getReg();
unsigned Flags = MI.getFlags();
LLT Ty = B.getMRI()->getType(Dst);
const LLT S16 = LLT::scalar(16);
const LLT S32 = LLT::scalar(32);

if (Ty == S32) {
  auto Log = B.buildFLog2(S32, Src0, Flags);
  auto Mul = B.buildIntrinsic(Intrinsic::amdgcn_fmul_legacy, {S32}, false)
    .addUse(Log.getReg(0))
    .addUse(Src1)
    .setMIFlags(Flags);
  B.buildFExp2(Dst, Mul, Flags);
} else if (Ty == S16) {
  // There's no f16 fmul_legacy, so we need to convert for it.
  auto Log = B.buildFLog2(S16, Src0, Flags);
  auto Ext0 = B.buildFPExt(S32, Log, Flags);
  auto Ext1 = B.buildFPExt(S32, Src1, Flags);
  auto Mul = B.buildIntrinsic(Intrinsic::amdgcn_fmul_legacy, {S32}, false)
    .addUse(Ext0.getReg(0))
    .addUse(Ext1.getReg(0))
    .setMIFlags(Flags);

  B.buildFExp2(Dst, B.buildFPTrunc(S16, Mul), Flags);
} else
  return false;

MI.eraseFromParent();
return true;
2551}

2553// Find a source register, ignoring any possible source modifiers.
2554static Register stripAnySourceMods(Register OrigSrc, MachineRegisterInfo &MRI) {
Register ModSrc = OrigSrc;
if (MachineInstr *SrcFNeg = getOpcodeDef(AMDGPU::G_FNEG, ModSrc, MRI)) {
  ModSrc = SrcFNeg->getOperand(1).getReg();
  if (MachineInstr *SrcFAbs = getOpcodeDef(AMDGPU::G_FABS, ModSrc, MRI))
    ModSrc = SrcFAbs->getOperand(1).getReg();
} else if (MachineInstr *SrcFAbs = getOpcodeDef(AMDGPU::G_FABS, ModSrc, MRI))
  ModSrc = SrcFAbs->getOperand(1).getReg();
return ModSrc;
2563}

2565bool AMDGPULegalizerInfo::legalizeFFloor(MachineInstr &MI,
                                       MachineRegisterInfo &MRI,
                                       MachineIRBuilder &B) const {

const LLT S1 = LLT::scalar(1);
const LLT S64 = LLT::scalar(64);
Register Dst = MI.getOperand(0).getReg();
Register OrigSrc = MI.getOperand(1).getReg();
unsigned Flags = MI.getFlags();
assert(ST.hasFractBug() && MRI.getType(Dst) == S64 &&((ST.hasFractBug() && MRI.getType(Dst) == S64 &&
 "this should not have been custom lowered") ? static_cast<
void> (0) : __assert_fail ("ST.hasFractBug() && MRI.getType(Dst) == S64 && \"this should not have been custom lowered\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2575, __PRETTY_FUNCTION__))
       "this should not have been custom lowered")((ST.hasFractBug() && MRI.getType(Dst) == S64 &&
 "this should not have been custom lowered") ? static_cast<
void> (0) : __assert_fail ("ST.hasFractBug() && MRI.getType(Dst) == S64 && \"this should not have been custom lowered\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2575, __PRETTY_FUNCTION__));

// V_FRACT is buggy on SI, so the F32 version is never used and (x-floor(x))
// is used instead. However, SI doesn't have V_FLOOR_F64, so the most
// efficient way to implement it is using V_FRACT_F64. The workaround for the
// V_FRACT bug is:
//    fract(x) = isnan(x) ? x : min(V_FRACT(x), 0.99999999999999999)
//
// Convert floor(x) to (x - fract(x))

auto Fract = B.buildIntrinsic(Intrinsic::amdgcn_fract, {S64}, false)
  .addUse(OrigSrc)
  .setMIFlags(Flags);

// Give source modifier matching some assistance before obscuring a foldable
// pattern.

// TODO: We can avoid the neg on the fract? The input sign to fract
// shouldn't matter?
Register ModSrc = stripAnySourceMods(OrigSrc, MRI);

auto Const = B.buildFConstant(S64, BitsToDouble(0x3fefffffffffffff));

Register Min = MRI.createGenericVirtualRegister(S64);

// We don't need to concern ourselves with the snan handling difference, so
// use the one which will directly select.
const SIMachineFunctionInfo *MFI = B.getMF().getInfo<SIMachineFunctionInfo>();
if (MFI->getMode().IEEE)
  B.buildFMinNumIEEE(Min, Fract, Const, Flags);
else
  B.buildFMinNum(Min, Fract, Const, Flags);

Register CorrectedFract = Min;
if (!MI.getFlag(MachineInstr::FmNoNans)) {
  auto IsNan = B.buildFCmp(CmpInst::FCMP_ORD, S1, ModSrc, ModSrc, Flags);
  CorrectedFract = B.buildSelect(S64, IsNan, ModSrc, Min, Flags).getReg(0);
}

auto NegFract = B.buildFNeg(S64, CorrectedFract, Flags);
B.buildFAdd(Dst, OrigSrc, NegFract, Flags);

MI.eraseFromParent();
return true;
2619}

2621// Turn an illegal packed v2s16 build vector into bit operations.
2622// TODO: This should probably be a bitcast action in LegalizerHelper.
2623bool AMDGPULegalizerInfo::legalizeBuildVector(
MachineInstr &MI, MachineRegisterInfo &MRI, MachineIRBuilder &B) const {
Register Dst = MI.getOperand(0).getReg();
const LLT S32 = LLT::scalar(32);
assert(MRI.getType(Dst) == LLT::vector(2, 16))((MRI.getType(Dst) == LLT::vector(2, 16)) ? static_cast<void
> (0) : __assert_fail ("MRI.getType(Dst) == LLT::vector(2, 16)"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2627, __PRETTY_FUNCTION__));

Register Src0 = MI.getOperand(1).getReg();
Register Src1 = MI.getOperand(2).getReg();
assert(MRI.getType(Src0) == LLT::scalar(16))((MRI.getType(Src0) == LLT::scalar(16)) ? static_cast<void
> (0) : __assert_fail ("MRI.getType(Src0) == LLT::scalar(16)"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2631, __PRETTY_FUNCTION__));

auto Merge = B.buildMerge(S32, {Src0, Src1});
B.buildBitcast(Dst, Merge);

MI.eraseFromParent();
return true;
2638}

2640// Check that this is a G_XOR x, -1
2641static bool isNot(const MachineRegisterInfo &MRI, const MachineInstr &MI) {
if (MI.getOpcode() != TargetOpcode::G_XOR)
  return false;
auto ConstVal = getConstantVRegSExtVal(MI.getOperand(2).getReg(), MRI);
return ConstVal && *ConstVal == -1;
2646}

2648// Return the use branch instruction, otherwise null if the usage is invalid.
2649static MachineInstr *
2650verifyCFIntrinsic(MachineInstr &MI, MachineRegisterInfo &MRI, MachineInstr *&Br,
                MachineBasicBlock *&UncondBrTarget, bool &Negated) {
Register CondDef = MI.getOperand(0).getReg();
if (!MRI.hasOneNonDBGUse(CondDef))
  return nullptr;

MachineBasicBlock *Parent = MI.getParent();
MachineInstr *UseMI = &*MRI.use_instr_nodbg_begin(CondDef);

if (isNot(MRI, *UseMI)) {
  Register NegatedCond = UseMI->getOperand(0).getReg();
  if (!MRI.hasOneNonDBGUse(NegatedCond))
    return nullptr;

  // We're deleting the def of this value, so we need to remove it.
  UseMI->eraseFromParent();

  UseMI = &*MRI.use_instr_nodbg_begin(NegatedCond);
  Negated = true;
}

if (UseMI->getParent() != Parent || UseMI->getOpcode() != AMDGPU::G_BRCOND)
  return nullptr;

// Make sure the cond br is followed by a G_BR, or is the last instruction.
MachineBasicBlock::iterator Next = std::next(UseMI->getIterator());
if (Next == Parent->end()) {
  MachineFunction::iterator NextMBB = std::next(Parent->getIterator());
  if (NextMBB == Parent->getParent()->end()) // Illegal intrinsic use.
    return nullptr;
  UncondBrTarget = &*NextMBB;
} else {
  if (Next->getOpcode() != AMDGPU::G_BR)
    return nullptr;
  Br = &*Next;
  UncondBrTarget = Br->getOperand(0).getMBB();
}

return UseMI;
2689}

2691bool AMDGPULegalizerInfo::loadInputValue(Register DstReg, MachineIRBuilder &B,
                                       const ArgDescriptor *Arg,
                                       const TargetRegisterClass *ArgRC,
                                       LLT ArgTy) const {
MCRegister SrcReg = Arg->getRegister();
assert(Register::isPhysicalRegister(SrcReg) && "Physical register expected")((Register::isPhysicalRegister(SrcReg) && "Physical register expected"
) ? static_cast<void> (0) : __assert_fail ("Register::isPhysicalRegister(SrcReg) && \"Physical register expected\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2696, __PRETTY_FUNCTION__));
6
←
'?' condition is true→
assert(DstReg.isVirtual() && "Virtual register expected")((DstReg.isVirtual() && "Virtual register expected") ?
 static_cast<void> (0) : __assert_fail ("DstReg.isVirtual() && \"Virtual register expected\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 2697, __PRETTY_FUNCTION__));
7
←
'?' condition is true→

Register LiveIn = getFunctionLiveInPhysReg(B.getMF(), B.getTII(), SrcReg, *ArgRC,
                                           ArgTy);
if (Arg->isMasked()) {
8
←
Calling 'ArgDescriptor::isMasked'→
11
←
Returning from 'ArgDescriptor::isMasked'→
12
←
Taking true branch→
  // TODO: Should we try to emit this once in the entry block?
  const LLT S32 = LLT::scalar(32);
  const unsigned Mask = Arg->getMask();
  const unsigned Shift = countTrailingZeros<unsigned>(Mask);
13
←
Calling 'countTrailingZeros<unsigned int>'→
20
←
Returning from 'countTrailingZeros<unsigned int>'→
21
←
'Shift' initialized to 32→

  Register AndMaskSrc = LiveIn;

  if (Shift21.1
'Shift' is not equal to 0
1
'Shift' is not equal to 0
1
'Shift' is not equal to 0
 != 0) {
22
←
Taking true branch→
    auto ShiftAmt = B.buildConstant(S32, Shift);
    AndMaskSrc = B.buildLShr(S32, LiveIn, ShiftAmt).getReg(0);
  }

  B.buildAnd(DstReg, AndMaskSrc, B.buildConstant(S32, Mask >> Shift));
23
←
The result of the right shift is undefined due to shifting by '32', which is greater or equal to the width of type 'unsigned int'
} else {
  B.buildCopy(DstReg, LiveIn);
}

return true;
2720}

2722bool AMDGPULegalizerInfo::loadInputValue(
  Register DstReg, MachineIRBuilder &B,
  AMDGPUFunctionArgInfo::PreloadedValue ArgType) const {
const SIMachineFunctionInfo *MFI = B.getMF().getInfo<SIMachineFunctionInfo>();
const ArgDescriptor *Arg;
const TargetRegisterClass *ArgRC;
LLT ArgTy;
std::tie(Arg, ArgRC, ArgTy) = MFI->getPreloadedValue(ArgType);

if (!Arg->isRegister() || !Arg->getRegister().isValid())
4
←
Taking false branch→
  return false; // TODO: Handle these
return loadInputValue(DstReg, B, Arg, ArgRC, ArgTy);
5
←
Calling 'AMDGPULegalizerInfo::loadInputValue'→
2734}

2736bool AMDGPULegalizerInfo::legalizePreloadedArgIntrin(
  MachineInstr &MI, MachineRegisterInfo &MRI, MachineIRBuilder &B,
  AMDGPUFunctionArgInfo::PreloadedValue ArgType) const {
if (!loadInputValue(MI.getOperand(0).getReg(), B, ArgType))
3
←
Calling 'AMDGPULegalizerInfo::loadInputValue'→
  return false;

MI.eraseFromParent();
return true;
2744}

2746bool AMDGPULegalizerInfo::legalizeFDIV(MachineInstr &MI,
                                     MachineRegisterInfo &MRI,
                                     MachineIRBuilder &B) const {
Register Dst = MI.getOperand(0).getReg();
LLT DstTy = MRI.getType(Dst);
LLT S16 = LLT::scalar(16);
LLT S32 = LLT::scalar(32);
LLT S64 = LLT::scalar(64);

if (DstTy == S16)
  return legalizeFDIV16(MI, MRI, B);
if (DstTy == S32)
  return legalizeFDIV32(MI, MRI, B);
if (DstTy == S64)
  return legalizeFDIV64(MI, MRI, B);

return false;
2763}

2765void AMDGPULegalizerInfo::legalizeUDIV_UREM32Impl(MachineIRBuilder &B,
                                                Register DstReg,
                                                Register X,
                                                Register Y,
                                                bool IsDiv) const {
const LLT S1 = LLT::scalar(1);
const LLT S32 = LLT::scalar(32);

// See AMDGPUCodeGenPrepare::expandDivRem32 for a description of the
// algorithm used here.

// Initial estimate of inv(y).
auto FloatY = B.buildUITOFP(S32, Y);
auto RcpIFlag = B.buildInstr(AMDGPU::G_AMDGPU_RCP_IFLAG, {S32}, {FloatY});
auto Scale = B.buildFConstant(S32, BitsToFloat(0x4f7ffffe));
auto ScaledY = B.buildFMul(S32, RcpIFlag, Scale);
auto Z = B.buildFPTOUI(S32, ScaledY);

// One round of UNR.
auto NegY = B.buildSub(S32, B.buildConstant(S32, 0), Y);
auto NegYZ = B.buildMul(S32, NegY, Z);
Z = B.buildAdd(S32, Z, B.buildUMulH(S32, Z, NegYZ));

// Quotient/remainder estimate.
auto Q = B.buildUMulH(S32, X, Z);
auto R = B.buildSub(S32, X, B.buildMul(S32, Q, Y));

// First quotient/remainder refinement.
auto One = B.buildConstant(S32, 1);
auto Cond = B.buildICmp(CmpInst::ICMP_UGE, S1, R, Y);
if (IsDiv)
  Q = B.buildSelect(S32, Cond, B.buildAdd(S32, Q, One), Q);
R = B.buildSelect(S32, Cond, B.buildSub(S32, R, Y), R);

// Second quotient/remainder refinement.
Cond = B.buildICmp(CmpInst::ICMP_UGE, S1, R, Y);
if (IsDiv)
  B.buildSelect(DstReg, Cond, B.buildAdd(S32, Q, One), Q);
else
  B.buildSelect(DstReg, Cond, B.buildSub(S32, R, Y), R);
2805}

2807bool AMDGPULegalizerInfo::legalizeUDIV_UREM32(MachineInstr &MI,
                                            MachineRegisterInfo &MRI,
                                            MachineIRBuilder &B) const {
const bool IsDiv = MI.getOpcode() == AMDGPU::G_UDIV;
Register DstReg = MI.getOperand(0).getReg();
Register Num = MI.getOperand(1).getReg();
Register Den = MI.getOperand(2).getReg();
legalizeUDIV_UREM32Impl(B, DstReg, Num, Den, IsDiv);
MI.eraseFromParent();
return true;
2817}

2819// Build integer reciprocal sequence arounud V_RCP_IFLAG_F32
2820//
2821// Return lo, hi of result
2822//
2823// %cvt.lo = G_UITOFP Val.lo
2824// %cvt.hi = G_UITOFP Val.hi
2825// %mad = G_FMAD %cvt.hi, 2**32, %cvt.lo
2826// %rcp = G_AMDGPU_RCP_IFLAG %mad
2827// %mul1 = G_FMUL %rcp, 0x5f7ffffc
2828// %mul2 = G_FMUL %mul1, 2**(-32)
2829// %trunc = G_INTRINSIC_TRUNC %mul2
2830// %mad2 = G_FMAD %trunc, -(2**32), %mul1
2831// return {G_FPTOUI %mad2, G_FPTOUI %trunc}
2832static std::pair<Register, Register> emitReciprocalU64(MachineIRBuilder &B,
                                                     Register Val) {
const LLT S32 = LLT::scalar(32);
auto Unmerge = B.buildUnmerge(S32, Val);

auto CvtLo = B.buildUITOFP(S32, Unmerge.getReg(0));
auto CvtHi = B.buildUITOFP(S32, Unmerge.getReg(1));

auto Mad = B.buildFMAD(S32, CvtHi, // 2**32
                       B.buildFConstant(S32, BitsToFloat(0x4f800000)), CvtLo);

auto Rcp = B.buildInstr(AMDGPU::G_AMDGPU_RCP_IFLAG, {S32}, {Mad});
auto Mul1 =
    B.buildFMul(S32, Rcp, B.buildFConstant(S32, BitsToFloat(0x5f7ffffc)));

// 2**(-32)
auto Mul2 =
    B.buildFMul(S32, Mul1, B.buildFConstant(S32, BitsToFloat(0x2f800000)));
auto Trunc = B.buildIntrinsicTrunc(S32, Mul2);

// -(2**32)
auto Mad2 = B.buildFMAD(S32, Trunc,
                        B.buildFConstant(S32, BitsToFloat(0xcf800000)), Mul1);

auto ResultLo = B.buildFPTOUI(S32, Mad2);
auto ResultHi = B.buildFPTOUI(S32, Trunc);

return {ResultLo.getReg(0), ResultHi.getReg(0)};
2860}

2862void AMDGPULegalizerInfo::legalizeUDIV_UREM64Impl(MachineIRBuilder &B,
                                                Register DstReg,
                                                Register Numer,
                                                Register Denom,
                                                bool IsDiv) const {
const LLT S32 = LLT::scalar(32);
const LLT S64 = LLT::scalar(64);
const LLT S1 = LLT::scalar(1);
Register RcpLo, RcpHi;

std::tie(RcpLo, RcpHi) = emitReciprocalU64(B, Denom);

auto Rcp = B.buildMerge(S64, {RcpLo, RcpHi});

auto Zero64 = B.buildConstant(S64, 0);
auto NegDenom = B.buildSub(S64, Zero64, Denom);

auto MulLo1 = B.buildMul(S64, NegDenom, Rcp);
auto MulHi1 = B.buildUMulH(S64, Rcp, MulLo1);

auto UnmergeMulHi1 = B.buildUnmerge(S32, MulHi1);
Register MulHi1_Lo = UnmergeMulHi1.getReg(0);
Register MulHi1_Hi = UnmergeMulHi1.getReg(1);

auto Add1_Lo = B.buildUAddo(S32, S1, RcpLo, MulHi1_Lo);
auto Add1_Hi = B.buildUAdde(S32, S1, RcpHi, MulHi1_Hi, Add1_Lo.getReg(1));
auto Add1_HiNc = B.buildAdd(S32, RcpHi, MulHi1_Hi);
auto Add1 = B.buildMerge(S64, {Add1_Lo, Add1_Hi});

auto MulLo2 = B.buildMul(S64, NegDenom, Add1);
auto MulHi2 = B.buildUMulH(S64, Add1, MulLo2);
auto UnmergeMulHi2 = B.buildUnmerge(S32, MulHi2);
Register MulHi2_Lo = UnmergeMulHi2.getReg(0);
Register MulHi2_Hi = UnmergeMulHi2.getReg(1);

auto Zero32 = B.buildConstant(S32, 0);
auto Add2_Lo = B.buildUAddo(S32, S1, Add1_Lo, MulHi2_Lo);
auto Add2_HiC =
    B.buildUAdde(S32, S1, Add1_HiNc, MulHi2_Hi, Add1_Lo.getReg(1));
auto Add2_Hi = B.buildUAdde(S32, S1, Add2_HiC, Zero32, Add2_Lo.getReg(1));
auto Add2 = B.buildMerge(S64, {Add2_Lo, Add2_Hi});

auto UnmergeNumer = B.buildUnmerge(S32, Numer);
Register NumerLo = UnmergeNumer.getReg(0);
Register NumerHi = UnmergeNumer.getReg(1);

auto MulHi3 = B.buildUMulH(S64, Numer, Add2);
auto Mul3 = B.buildMul(S64, Denom, MulHi3);
auto UnmergeMul3 = B.buildUnmerge(S32, Mul3);
Register Mul3_Lo = UnmergeMul3.getReg(0);
Register Mul3_Hi = UnmergeMul3.getReg(1);
auto Sub1_Lo = B.buildUSubo(S32, S1, NumerLo, Mul3_Lo);
auto Sub1_Hi = B.buildUSube(S32, S1, NumerHi, Mul3_Hi, Sub1_Lo.getReg(1));
auto Sub1_Mi = B.buildSub(S32, NumerHi, Mul3_Hi);
auto Sub1 = B.buildMerge(S64, {Sub1_Lo, Sub1_Hi});

auto UnmergeDenom = B.buildUnmerge(S32, Denom);
Register DenomLo = UnmergeDenom.getReg(0);
Register DenomHi = UnmergeDenom.getReg(1);

auto CmpHi = B.buildICmp(CmpInst::ICMP_UGE, S1, Sub1_Hi, DenomHi);
auto C1 = B.buildSExt(S32, CmpHi);

auto CmpLo = B.buildICmp(CmpInst::ICMP_UGE, S1, Sub1_Lo, DenomLo);
auto C2 = B.buildSExt(S32, CmpLo);

auto CmpEq = B.buildICmp(CmpInst::ICMP_EQ, S1, Sub1_Hi, DenomHi);
auto C3 = B.buildSelect(S32, CmpEq, C2, C1);

// TODO: Here and below portions of the code can be enclosed into if/endif.
// Currently control flow is unconditional and we have 4 selects after
// potential endif to substitute PHIs.

// if C3 != 0 ...
auto Sub2_Lo = B.buildUSubo(S32, S1, Sub1_Lo, DenomLo);
auto Sub2_Mi = B.buildUSube(S32, S1, Sub1_Mi, DenomHi, Sub1_Lo.getReg(1));
auto Sub2_Hi = B.buildUSube(S32, S1, Sub2_Mi, Zero32, Sub2_Lo.getReg(1));
auto Sub2 = B.buildMerge(S64, {Sub2_Lo, Sub2_Hi});

auto One64 = B.buildConstant(S64, 1);
auto Add3 = B.buildAdd(S64, MulHi3, One64);

auto C4 =
    B.buildSExt(S32, B.buildICmp(CmpInst::ICMP_UGE, S1, Sub2_Hi, DenomHi));
auto C5 =
    B.buildSExt(S32, B.buildICmp(CmpInst::ICMP_UGE, S1, Sub2_Lo, DenomLo));
auto C6 = B.buildSelect(
    S32, B.buildICmp(CmpInst::ICMP_EQ, S1, Sub2_Hi, DenomHi), C5, C4);

// if (C6 != 0)
auto Add4 = B.buildAdd(S64, Add3, One64);
auto Sub3_Lo = B.buildUSubo(S32, S1, Sub2_Lo, DenomLo);

auto Sub3_Mi = B.buildUSube(S32, S1, Sub2_Mi, DenomHi, Sub2_Lo.getReg(1));
auto Sub3_Hi = B.buildUSube(S32, S1, Sub3_Mi, Zero32, Sub3_Lo.getReg(1));
auto Sub3 = B.buildMerge(S64, {Sub3_Lo, Sub3_Hi});

// endif C6
// endif C3

if (IsDiv) {
  auto Sel1 = B.buildSelect(
      S64, B.buildICmp(CmpInst::ICMP_NE, S1, C6, Zero32), Add4, Add3);
  B.buildSelect(DstReg,
                B.buildICmp(CmpInst::ICMP_NE, S1, C3, Zero32), Sel1, MulHi3);
} else {
  auto Sel2 = B.buildSelect(
      S64, B.buildICmp(CmpInst::ICMP_NE, S1, C6, Zero32), Sub3, Sub2);
  B.buildSelect(DstReg,
                B.buildICmp(CmpInst::ICMP_NE, S1, C3, Zero32), Sel2, Sub1);
}
2973}

2975bool AMDGPULegalizerInfo::legalizeUDIV_UREM(MachineInstr &MI,
                                          MachineRegisterInfo &MRI,
                                          MachineIRBuilder &B) const {
const LLT S64 = LLT::scalar(64);
const LLT S32 = LLT::scalar(32);
const bool IsDiv = MI.getOpcode() == AMDGPU::G_UDIV;
Register DstReg = MI.getOperand(0).getReg();
Register Num = MI.getOperand(1).getReg();
Register Den = MI.getOperand(2).getReg();
LLT Ty = MRI.getType(DstReg);

if (Ty == S32)
  legalizeUDIV_UREM32Impl(B, DstReg, Num, Den, IsDiv);
else if (Ty == S64)
  legalizeUDIV_UREM64Impl(B, DstReg, Num, Den, IsDiv);
else
  return false;

MI.eraseFromParent();
return true;

2996}

2998bool AMDGPULegalizerInfo::legalizeSDIV_SREM(MachineInstr &MI,
                                          MachineRegisterInfo &MRI,
                                          MachineIRBuilder &B) const {
const LLT S64 = LLT::scalar(64);
const LLT S32 = LLT::scalar(32);

Register DstReg = MI.getOperand(0).getReg();
const LLT Ty = MRI.getType(DstReg);
if (Ty != S32 && Ty != S64)
  return false;

const bool IsDiv = MI.getOpcode() == AMDGPU::G_SDIV;

Register LHS = MI.getOperand(1).getReg();
Register RHS = MI.getOperand(2).getReg();

auto SignBitOffset = B.buildConstant(S32, Ty.getSizeInBits() - 1);
auto LHSign = B.buildAShr(Ty, LHS, SignBitOffset);
auto RHSign = B.buildAShr(Ty, RHS, SignBitOffset);

LHS = B.buildAdd(Ty, LHS, LHSign).getReg(0);
RHS = B.buildAdd(Ty, RHS, RHSign).getReg(0);

LHS = B.buildXor(Ty, LHS, LHSign).getReg(0);
RHS = B.buildXor(Ty, RHS, RHSign).getReg(0);

Register UDivRem = MRI.createGenericVirtualRegister(Ty);
if (Ty == S32)
  legalizeUDIV_UREM32Impl(B, UDivRem, LHS, RHS, IsDiv);
else
  legalizeUDIV_UREM64Impl(B, UDivRem, LHS, RHS, IsDiv);

Register Sign;
if (IsDiv)
  Sign = B.buildXor(Ty, LHSign, RHSign).getReg(0);
else
  Sign = LHSign.getReg(0); // Remainder sign is the same as LHS

UDivRem = B.buildXor(Ty, UDivRem, Sign).getReg(0);
B.buildSub(DstReg, UDivRem, Sign);

MI.eraseFromParent();
return true;
3041}

3043bool AMDGPULegalizerInfo::legalizeFastUnsafeFDIV(MachineInstr &MI,
                                               MachineRegisterInfo &MRI,
                                               MachineIRBuilder &B) const {
Register Res = MI.getOperand(0).getReg();
Register LHS = MI.getOperand(1).getReg();
Register RHS = MI.getOperand(2).getReg();
uint16_t Flags = MI.getFlags();
LLT ResTy = MRI.getType(Res);

const MachineFunction &MF = B.getMF();
bool AllowInaccurateRcp = MF.getTarget().Options.UnsafeFPMath ||
                          MI.getFlag(MachineInstr::FmAfn);

if (!AllowInaccurateRcp)
  return false;

if (auto CLHS = getConstantFPVRegVal(LHS, MRI)) {
  // 1 / x -> RCP(x)
  if (CLHS->isExactlyValue(1.0)) {
    B.buildIntrinsic(Intrinsic::amdgcn_rcp, Res, false)
      .addUse(RHS)
      .setMIFlags(Flags);

    MI.eraseFromParent();
    return true;
  }

  // -1 / x -> RCP( FNEG(x) )
  if (CLHS->isExactlyValue(-1.0)) {
    auto FNeg = B.buildFNeg(ResTy, RHS, Flags);
    B.buildIntrinsic(Intrinsic::amdgcn_rcp, Res, false)
      .addUse(FNeg.getReg(0))
      .setMIFlags(Flags);

    MI.eraseFromParent();
    return true;
  }
}

// x / y -> x * (1.0 / y)
auto RCP = B.buildIntrinsic(Intrinsic::amdgcn_rcp, {ResTy}, false)
  .addUse(RHS)
  .setMIFlags(Flags);
B.buildFMul(Res, LHS, RCP, Flags);

MI.eraseFromParent();
return true;
3090}

3092bool AMDGPULegalizerInfo::legalizeFastUnsafeFDIV64(MachineInstr &MI,
                                                 MachineRegisterInfo &MRI,
                                                 MachineIRBuilder &B) const {
Register Res = MI.getOperand(0).getReg();
Register X = MI.getOperand(1).getReg();
Register Y = MI.getOperand(2).getReg();
uint16_t Flags = MI.getFlags();
LLT ResTy = MRI.getType(Res);

const MachineFunction &MF = B.getMF();
bool AllowInaccurateRcp = MF.getTarget().Options.UnsafeFPMath ||
                          MI.getFlag(MachineInstr::FmAfn);

if (!AllowInaccurateRcp)
  return false;

auto NegY = B.buildFNeg(ResTy, Y);
auto One = B.buildFConstant(ResTy, 1.0);

auto R = B.buildIntrinsic(Intrinsic::amdgcn_rcp, {ResTy}, false)
  .addUse(Y)
  .setMIFlags(Flags);

auto Tmp0 = B.buildFMA(ResTy, NegY, R, One);
R = B.buildFMA(ResTy, Tmp0, R, R);

auto Tmp1 = B.buildFMA(ResTy, NegY, R, One);
R = B.buildFMA(ResTy, Tmp1, R, R);

auto Ret = B.buildFMul(ResTy, X, R);
auto Tmp2 = B.buildFMA(ResTy, NegY, Ret, X);

B.buildFMA(Res, Tmp2, R, Ret);
MI.eraseFromParent();
return true;
3127}

3129bool AMDGPULegalizerInfo::legalizeFDIV16(MachineInstr &MI,
                                       MachineRegisterInfo &MRI,
                                       MachineIRBuilder &B) const {
if (legalizeFastUnsafeFDIV(MI, MRI, B))
  return true;

Register Res = MI.getOperand(0).getReg();
Register LHS = MI.getOperand(1).getReg();
Register RHS = MI.getOperand(2).getReg();

uint16_t Flags = MI.getFlags();

LLT S16 = LLT::scalar(16);
LLT S32 = LLT::scalar(32);

auto LHSExt = B.buildFPExt(S32, LHS, Flags);
auto RHSExt = B.buildFPExt(S32, RHS, Flags);

auto RCP = B.buildIntrinsic(Intrinsic::amdgcn_rcp, {S32}, false)
  .addUse(RHSExt.getReg(0))
  .setMIFlags(Flags);

auto QUOT = B.buildFMul(S32, LHSExt, RCP, Flags);
auto RDst = B.buildFPTrunc(S16, QUOT, Flags);

B.buildIntrinsic(Intrinsic::amdgcn_div_fixup, Res, false)
  .addUse(RDst.getReg(0))
  .addUse(RHS)
  .addUse(LHS)
  .setMIFlags(Flags);

MI.eraseFromParent();
return true;
3162}

3164// Enable or disable FP32 denorm mode. When 'Enable' is true, emit instructions
3165// to enable denorm mode. When 'Enable' is false, disable denorm mode.
3166static void toggleSPDenormMode(bool Enable,
                             MachineIRBuilder &B,
                             const GCNSubtarget &ST,
                             AMDGPU::SIModeRegisterDefaults Mode) {
// Set SP denorm mode to this value.
unsigned SPDenormMode =
  Enable ? FP_DENORM_FLUSH_NONE3 : Mode.fpDenormModeSPValue();

if (ST.hasDenormModeInst()) {
  // Preserve default FP64FP16 denorm mode while updating FP32 mode.
  uint32_t DPDenormModeDefault = Mode.fpDenormModeDPValue();

  uint32_t NewDenormModeValue = SPDenormMode | (DPDenormModeDefault << 2);
  B.buildInstr(AMDGPU::S_DENORM_MODE)
    .addImm(NewDenormModeValue);

} else {
  // Select FP32 bit field in mode register.
  unsigned SPDenormModeBitField = AMDGPU::Hwreg::ID_MODE |
                                  (4 << AMDGPU::Hwreg::OFFSET_SHIFT_) |
                                  (1 << AMDGPU::Hwreg::WIDTH_M1_SHIFT_);

  B.buildInstr(AMDGPU::S_SETREG_IMM32_B32)
    .addImm(SPDenormMode)
    .addImm(SPDenormModeBitField);
}
3192}

3194bool AMDGPULegalizerInfo::legalizeFDIV32(MachineInstr &MI,
                                       MachineRegisterInfo &MRI,
                                       MachineIRBuilder &B) const {
if (legalizeFastUnsafeFDIV(MI, MRI, B))
  return true;

Register Res = MI.getOperand(0).getReg();
Register LHS = MI.getOperand(1).getReg();
Register RHS = MI.getOperand(2).getReg();
const SIMachineFunctionInfo *MFI = B.getMF().getInfo<SIMachineFunctionInfo>();
AMDGPU::SIModeRegisterDefaults Mode = MFI->getMode();

uint16_t Flags = MI.getFlags();

LLT S32 = LLT::scalar(32);
LLT S1 = LLT::scalar(1);

auto One = B.buildFConstant(S32, 1.0f);

auto DenominatorScaled =
  B.buildIntrinsic(Intrinsic::amdgcn_div_scale, {S32, S1}, false)
    .addUse(LHS)
    .addUse(RHS)
    .addImm(0)
    .setMIFlags(Flags);
auto NumeratorScaled =
  B.buildIntrinsic(Intrinsic::amdgcn_div_scale, {S32, S1}, false)
    .addUse(LHS)
    .addUse(RHS)
    .addImm(1)
    .setMIFlags(Flags);

auto ApproxRcp = B.buildIntrinsic(Intrinsic::amdgcn_rcp, {S32}, false)
  .addUse(DenominatorScaled.getReg(0))
  .setMIFlags(Flags);
auto NegDivScale0 = B.buildFNeg(S32, DenominatorScaled, Flags);

// FIXME: Doesn't correctly model the FP mode switch, and the FP operations
// aren't modeled as reading it.
if (!Mode.allFP32Denormals())
  toggleSPDenormMode(true, B, ST, Mode);

auto Fma0 = B.buildFMA(S32, NegDivScale0, ApproxRcp, One, Flags);
auto Fma1 = B.buildFMA(S32, Fma0, ApproxRcp, ApproxRcp, Flags);
auto Mul = B.buildFMul(S32, NumeratorScaled, Fma1, Flags);
auto Fma2 = B.buildFMA(S32, NegDivScale0, Mul, NumeratorScaled, Flags);
auto Fma3 = B.buildFMA(S32, Fma2, Fma1, Mul, Flags);
auto Fma4 = B.buildFMA(S32, NegDivScale0, Fma3, NumeratorScaled, Flags);

if (!Mode.allFP32Denormals())
  toggleSPDenormMode(false, B, ST, Mode);

auto Fmas = B.buildIntrinsic(Intrinsic::amdgcn_div_fmas, {S32}, false)
  .addUse(Fma4.getReg(0))
  .addUse(Fma1.getReg(0))
  .addUse(Fma3.getReg(0))
  .addUse(NumeratorScaled.getReg(1))
  .setMIFlags(Flags);

B.buildIntrinsic(Intrinsic::amdgcn_div_fixup, Res, false)
  .addUse(Fmas.getReg(0))
  .addUse(RHS)
  .addUse(LHS)
  .setMIFlags(Flags);

MI.eraseFromParent();
return true;
3261}

3263bool AMDGPULegalizerInfo::legalizeFDIV64(MachineInstr &MI,
                                       MachineRegisterInfo &MRI,
                                       MachineIRBuilder &B) const {
if (legalizeFastUnsafeFDIV64(MI, MRI, B))
  return true;

Register Res = MI.getOperand(0).getReg();
Register LHS = MI.getOperand(1).getReg();
Register RHS = MI.getOperand(2).getReg();

uint16_t Flags = MI.getFlags();

LLT S64 = LLT::scalar(64);
LLT S1 = LLT::scalar(1);

auto One = B.buildFConstant(S64, 1.0);

auto DivScale0 = B.buildIntrinsic(Intrinsic::amdgcn_div_scale, {S64, S1}, false)
  .addUse(LHS)
  .addUse(RHS)
  .addImm(0)
  .setMIFlags(Flags);

auto NegDivScale0 = B.buildFNeg(S64, DivScale0.getReg(0), Flags);

auto Rcp = B.buildIntrinsic(Intrinsic::amdgcn_rcp, {S64}, false)
  .addUse(DivScale0.getReg(0))
  .setMIFlags(Flags);

auto Fma0 = B.buildFMA(S64, NegDivScale0, Rcp, One, Flags);
auto Fma1 = B.buildFMA(S64, Rcp, Fma0, Rcp, Flags);
auto Fma2 = B.buildFMA(S64, NegDivScale0, Fma1, One, Flags);

auto DivScale1 = B.buildIntrinsic(Intrinsic::amdgcn_div_scale, {S64, S1}, false)
  .addUse(LHS)
  .addUse(RHS)
  .addImm(1)
  .setMIFlags(Flags);

auto Fma3 = B.buildFMA(S64, Fma1, Fma2, Fma1, Flags);
auto Mul = B.buildFMul(S64, DivScale1.getReg(0), Fma3, Flags);
auto Fma4 = B.buildFMA(S64, NegDivScale0, Mul, DivScale1.getReg(0), Flags);

Register Scale;
if (!ST.hasUsableDivScaleConditionOutput()) {
  // Workaround a hardware bug on SI where the condition output from div_scale
  // is not usable.

  LLT S32 = LLT::scalar(32);

  auto NumUnmerge = B.buildUnmerge(S32, LHS);
  auto DenUnmerge = B.buildUnmerge(S32, RHS);
  auto Scale0Unmerge = B.buildUnmerge(S32, DivScale0);
  auto Scale1Unmerge = B.buildUnmerge(S32, DivScale1);

  auto CmpNum = B.buildICmp(ICmpInst::ICMP_EQ, S1, NumUnmerge.getReg(1),
                            Scale1Unmerge.getReg(1));
  auto CmpDen = B.buildICmp(ICmpInst::ICMP_EQ, S1, DenUnmerge.getReg(1),
                            Scale0Unmerge.getReg(1));
  Scale = B.buildXor(S1, CmpNum, CmpDen).getReg(0);
} else {
  Scale = DivScale1.getReg(1);
}

auto Fmas = B.buildIntrinsic(Intrinsic::amdgcn_div_fmas, {S64}, false)
  .addUse(Fma4.getReg(0))
  .addUse(Fma3.getReg(0))
  .addUse(Mul.getReg(0))
  .addUse(Scale)
  .setMIFlags(Flags);

B.buildIntrinsic(Intrinsic::amdgcn_div_fixup, makeArrayRef(Res), false)
  .addUse(Fmas.getReg(0))
  .addUse(RHS)
  .addUse(LHS)
  .setMIFlags(Flags);

MI.eraseFromParent();
return true;
3342}

3344bool AMDGPULegalizerInfo::legalizeFDIVFastIntrin(MachineInstr &MI,
                                               MachineRegisterInfo &MRI,
                                               MachineIRBuilder &B) const {
Register Res = MI.getOperand(0).getReg();
Register LHS = MI.getOperand(2).getReg();
Register RHS = MI.getOperand(3).getReg();
uint16_t Flags = MI.getFlags();

LLT S32 = LLT::scalar(32);
LLT S1 = LLT::scalar(1);

auto Abs = B.buildFAbs(S32, RHS, Flags);
const APFloat C0Val(1.0f);

auto C0 = B.buildConstant(S32, 0x6f800000);
auto C1 = B.buildConstant(S32, 0x2f800000);
auto C2 = B.buildConstant(S32, FloatToBits(1.0f));

auto CmpRes = B.buildFCmp(CmpInst::FCMP_OGT, S1, Abs, C0, Flags);
auto Sel = B.buildSelect(S32, CmpRes, C1, C2, Flags);

auto Mul0 = B.buildFMul(S32, RHS, Sel, Flags);

auto RCP = B.buildIntrinsic(Intrinsic::amdgcn_rcp, {S32}, false)
  .addUse(Mul0.getReg(0))
  .setMIFlags(Flags);

auto Mul1 = B.buildFMul(S32, LHS, RCP, Flags);

B.buildFMul(Res, Sel, Mul1, Flags);

MI.eraseFromParent();
return true;
3377}

3379// Expand llvm.amdgcn.rsq.clamp on targets that don't support the instruction.
3380// FIXME: Why do we handle this one but not other removed instructions?
3381//
3382// Reciprocal square root.  The clamp prevents infinite results, clamping
3383// infinities to max_float.  D.f = 1.0 / sqrt(S0.f), result clamped to
3384// +-max_float.
3385bool AMDGPULegalizerInfo::legalizeRsqClampIntrinsic(MachineInstr &MI,
                                                  MachineRegisterInfo &MRI,
                                                  MachineIRBuilder &B) const {
if (ST.getGeneration() < AMDGPUSubtarget::VOLCANIC_ISLANDS)
  return true;

Register Dst = MI.getOperand(0).getReg();
Register Src = MI.getOperand(2).getReg();
auto Flags = MI.getFlags();

LLT Ty = MRI.getType(Dst);

const fltSemantics *FltSemantics;
if (Ty == LLT::scalar(32))
  FltSemantics = &APFloat::IEEEsingle();
else if (Ty == LLT::scalar(64))
  FltSemantics = &APFloat::IEEEdouble();
else
  return false;

auto Rsq = B.buildIntrinsic(Intrinsic::amdgcn_rsq, {Ty}, false)
  .addUse(Src)
  .setMIFlags(Flags);

// We don't need to concern ourselves with the snan handling difference, since
// the rsq quieted (or not) so use the one which will directly select.
const SIMachineFunctionInfo *MFI = B.getMF().getInfo<SIMachineFunctionInfo>();
const bool UseIEEE = MFI->getMode().IEEE;

auto MaxFlt = B.buildFConstant(Ty, APFloat::getLargest(*FltSemantics));
auto ClampMax = UseIEEE ? B.buildFMinNumIEEE(Ty, Rsq, MaxFlt, Flags) :
                          B.buildFMinNum(Ty, Rsq, MaxFlt, Flags);

auto MinFlt = B.buildFConstant(Ty, APFloat::getLargest(*FltSemantics, true));

if (UseIEEE)
  B.buildFMaxNumIEEE(Dst, ClampMax, MinFlt, Flags);
else
  B.buildFMaxNum(Dst, ClampMax, MinFlt, Flags);
MI.eraseFromParent();
return true;
3426}

3428static unsigned getDSFPAtomicOpcode(Intrinsic::ID IID) {
switch (IID) {
case Intrinsic::amdgcn_ds_fadd:
  return AMDGPU::G_ATOMICRMW_FADD;
case Intrinsic::amdgcn_ds_fmin:
  return AMDGPU::G_AMDGPU_ATOMIC_FMIN;
case Intrinsic::amdgcn_ds_fmax:
  return AMDGPU::G_AMDGPU_ATOMIC_FMAX;
default:
  llvm_unreachable("not a DS FP intrinsic")::llvm::llvm_unreachable_internal("not a DS FP intrinsic", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 3437);
}
3439}

3441bool AMDGPULegalizerInfo::legalizeDSAtomicFPIntrinsic(LegalizerHelper &Helper,
                                                    MachineInstr &MI,
                                                    Intrinsic::ID IID) const {
GISelChangeObserver &Observer = Helper.Observer;
Observer.changingInstr(MI);

MI.setDesc(ST.getInstrInfo()->get(getDSFPAtomicOpcode(IID)));

// The remaining operands were used to set fields in the MemOperand on
// construction.
for (int I = 6; I > 3; --I)
  MI.RemoveOperand(I);

MI.RemoveOperand(1); // Remove the intrinsic ID.
Observer.changedInstr(MI);
return true;
3457}

3459bool AMDGPULegalizerInfo::getImplicitArgPtr(Register DstReg,
                                          MachineRegisterInfo &MRI,
                                          MachineIRBuilder &B) const {
uint64_t Offset =
  ST.getTargetLowering()->getImplicitParameterOffset(
    B.getMF(), AMDGPUTargetLowering::FIRST_IMPLICIT);
LLT DstTy = MRI.getType(DstReg);
LLT IdxTy = LLT::scalar(DstTy.getSizeInBits());

Register KernargPtrReg = MRI.createGenericVirtualRegister(DstTy);
if (!loadInputValue(KernargPtrReg, B,
                    AMDGPUFunctionArgInfo::KERNARG_SEGMENT_PTR))
  return false;

// FIXME: This should be nuw
B.buildPtrAdd(DstReg, KernargPtrReg, B.buildConstant(IdxTy, Offset).getReg(0));
return true;
3476}

3478bool AMDGPULegalizerInfo::legalizeImplicitArgPtr(MachineInstr &MI,
                                               MachineRegisterInfo &MRI,
                                               MachineIRBuilder &B) const {
const SIMachineFunctionInfo *MFI = B.getMF().getInfo<SIMachineFunctionInfo>();
if (!MFI->isEntryFunction()) {
  return legalizePreloadedArgIntrin(MI, MRI, B,
                                    AMDGPUFunctionArgInfo::IMPLICIT_ARG_PTR);
}

Register DstReg = MI.getOperand(0).getReg();
if (!getImplicitArgPtr(DstReg, MRI, B))
  return false;

MI.eraseFromParent();
return true;
3493}

3495bool AMDGPULegalizerInfo::legalizeIsAddrSpace(MachineInstr &MI,
                                            MachineRegisterInfo &MRI,
                                            MachineIRBuilder &B,
                                            unsigned AddrSpace) const {
Register ApertureReg = getSegmentAperture(AddrSpace, MRI, B);
auto Unmerge = B.buildUnmerge(LLT::scalar(32), MI.getOperand(2).getReg());
Register Hi32 = Unmerge.getReg(1);

B.buildICmp(ICmpInst::ICMP_EQ, MI.getOperand(0), Hi32, ApertureReg);
MI.eraseFromParent();
return true;
3506}

3508// The raw.(t)buffer and struct.(t)buffer intrinsics have two offset args:
3509// offset (the offset that is included in bounds checking and swizzling, to be
3510// split between the instruction's voffset and immoffset fields) and soffset
3511// (the offset that is excluded from bounds checking and swizzling, to go in
3512// the instruction's soffset field).  This function takes the first kind of
3513// offset and figures out how to split it between voffset and immoffset.
3514std::tuple<Register, unsigned, unsigned>
3515AMDGPULegalizerInfo::splitBufferOffsets(MachineIRBuilder &B,
                                      Register OrigOffset) const {
const unsigned MaxImm = 4095;
Register BaseReg;
unsigned TotalConstOffset;
const LLT S32 = LLT::scalar(32);

std::tie(BaseReg, TotalConstOffset) =
    AMDGPU::getBaseWithConstantOffset(*B.getMRI(), OrigOffset);

unsigned ImmOffset = TotalConstOffset;

// If the immediate value is too big for the immoffset field, put the value
// and -4096 into the immoffset field so that the value that is copied/added
// for the voffset field is a multiple of 4096, and it stands more chance
// of being CSEd with the copy/add for another similar load/store.
// However, do not do that rounding down to a multiple of 4096 if that is a
// negative number, as it appears to be illegal to have a negative offset
// in the vgpr, even if adding the immediate offset makes it positive.
unsigned Overflow = ImmOffset & ~MaxImm;
ImmOffset -= Overflow;
if ((int32_t)Overflow < 0) {
  Overflow += ImmOffset;
  ImmOffset = 0;
}

if (Overflow != 0) {
  if (!BaseReg) {
    BaseReg = B.buildConstant(S32, Overflow).getReg(0);
  } else {
    auto OverflowVal = B.buildConstant(S32, Overflow);
    BaseReg = B.buildAdd(S32, BaseReg, OverflowVal).getReg(0);
  }
}

if (!BaseReg)
  BaseReg = B.buildConstant(S32, 0).getReg(0);

return std::make_tuple(BaseReg, ImmOffset, TotalConstOffset);
3554}

3556/// Handle register layout difference for f16 images for some subtargets.
3557Register AMDGPULegalizerInfo::handleD16VData(MachineIRBuilder &B,
                                           MachineRegisterInfo &MRI,
                                           Register Reg,
                                           bool ImageStore) const {
const LLT S16 = LLT::scalar(16);
const LLT S32 = LLT::scalar(32);
LLT StoreVT = MRI.getType(Reg);
assert(StoreVT.isVector() && StoreVT.getElementType() == S16)((StoreVT.isVector() && StoreVT.getElementType() == S16
) ? static_cast<void> (0) : __assert_fail ("StoreVT.isVector() && StoreVT.getElementType() == S16"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 3564, __PRETTY_FUNCTION__));

if (ST.hasUnpackedD16VMem()) {
  auto Unmerge = B.buildUnmerge(S16, Reg);

  SmallVector<Register, 4> WideRegs;
  for (int I = 0, E = Unmerge->getNumOperands() - 1; I != E; ++I)
    WideRegs.push_back(B.buildAnyExt(S32, Unmerge.getReg(I)).getReg(0));

  int NumElts = StoreVT.getNumElements();

  return B.buildBuildVector(LLT::vector(NumElts, S32), WideRegs).getReg(0);
}

if (ImageStore && ST.hasImageStoreD16Bug()) {
  if (StoreVT.getNumElements() == 2) {
    SmallVector<Register, 4> PackedRegs;
    Reg = B.buildBitcast(S32, Reg).getReg(0);
    PackedRegs.push_back(Reg);
    PackedRegs.resize(2, B.buildUndef(S32).getReg(0));
    return B.buildBuildVector(LLT::vector(2, S32), PackedRegs).getReg(0);
  }

  if (StoreVT.getNumElements() == 3) {
    SmallVector<Register, 4> PackedRegs;
    auto Unmerge = B.buildUnmerge(S16, Reg);
    for (int I = 0, E = Unmerge->getNumOperands() - 1; I != E; ++I)
      PackedRegs.push_back(Unmerge.getReg(I));
    PackedRegs.resize(6, B.buildUndef(S16).getReg(0));
    Reg = B.buildBuildVector(LLT::vector(6, S16), PackedRegs).getReg(0);
    return B.buildBitcast(LLT::vector(3, S32), Reg).getReg(0);
  }

  if (StoreVT.getNumElements() == 4) {
    SmallVector<Register, 4> PackedRegs;
    Reg = B.buildBitcast(LLT::vector(2, S32), Reg).getReg(0);
    auto Unmerge = B.buildUnmerge(S32, Reg);
    for (int I = 0, E = Unmerge->getNumOperands() - 1; I != E; ++I)
      PackedRegs.push_back(Unmerge.getReg(I));
    PackedRegs.resize(4, B.buildUndef(S32).getReg(0));
    return B.buildBuildVector(LLT::vector(4, S32), PackedRegs).getReg(0);
  }

  llvm_unreachable("invalid data type")::llvm::llvm_unreachable_internal("invalid data type", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 3607);
}

return Reg;
3611}

3613Register AMDGPULegalizerInfo::fixStoreSourceType(
MachineIRBuilder &B, Register VData, bool IsFormat) const {
MachineRegisterInfo *MRI = B.getMRI();
LLT Ty = MRI->getType(VData);

const LLT S16 = LLT::scalar(16);

// Fixup illegal register types for i8 stores.
if (Ty == LLT::scalar(8) || Ty == S16) {
  Register AnyExt = B.buildAnyExt(LLT::scalar(32), VData).getReg(0);
  return AnyExt;
}

if (Ty.isVector()) {
  if (Ty.getElementType() == S16 && Ty.getNumElements() <= 4) {
    if (IsFormat)
      return handleD16VData(B, *MRI, VData);
  }
}

return VData;
3634}

3636bool AMDGPULegalizerInfo::legalizeBufferStore(MachineInstr &MI,
                                            MachineRegisterInfo &MRI,
                                            MachineIRBuilder &B,
                                            bool IsTyped,
                                            bool IsFormat) const {
Register VData = MI.getOperand(1).getReg();
LLT Ty = MRI.getType(VData);
LLT EltTy = Ty.getScalarType();
const bool IsD16 = IsFormat && (EltTy.getSizeInBits() == 16);
const LLT S32 = LLT::scalar(32);

VData = fixStoreSourceType(B, VData, IsFormat);
Register RSrc = MI.getOperand(2).getReg();

MachineMemOperand *MMO = *MI.memoperands_begin();
const int MemSize = MMO->getSize();

unsigned ImmOffset;
unsigned TotalOffset;

// The typed intrinsics add an immediate after the registers.
const unsigned NumVIndexOps = IsTyped ? 8 : 7;

// The struct intrinsic variants add one additional operand over raw.
const bool HasVIndex = MI.getNumOperands() == NumVIndexOps;
Register VIndex;
int OpOffset = 0;
if (HasVIndex) {
  VIndex = MI.getOperand(3).getReg();
  OpOffset = 1;
}

Register VOffset = MI.getOperand(3 + OpOffset).getReg();
Register SOffset = MI.getOperand(4 + OpOffset).getReg();

unsigned Format = 0;
if (IsTyped) {
  Format = MI.getOperand(5 + OpOffset).getImm();
  ++OpOffset;
}

unsigned AuxiliaryData = MI.getOperand(5 + OpOffset).getImm();

std::tie(VOffset, ImmOffset, TotalOffset) = splitBufferOffsets(B, VOffset);
if (TotalOffset != 0)
  MMO = B.getMF().getMachineMemOperand(MMO, TotalOffset, MemSize);

unsigned Opc;
if (IsTyped) {
  Opc = IsD16 ? AMDGPU::G_AMDGPU_TBUFFER_STORE_FORMAT_D16 :
                AMDGPU::G_AMDGPU_TBUFFER_STORE_FORMAT;
} else if (IsFormat) {
  Opc = IsD16 ? AMDGPU::G_AMDGPU_BUFFER_STORE_FORMAT_D16 :
                AMDGPU::G_AMDGPU_BUFFER_STORE_FORMAT;
} else {
  switch (MemSize) {
  case 1:
    Opc = AMDGPU::G_AMDGPU_BUFFER_STORE_BYTE;
    break;
  case 2:
    Opc = AMDGPU::G_AMDGPU_BUFFER_STORE_SHORT;
    break;
  default:
    Opc = AMDGPU::G_AMDGPU_BUFFER_STORE;
    break;
  }
}

if (!VIndex)
  VIndex = B.buildConstant(S32, 0).getReg(0);

auto MIB = B.buildInstr(Opc)
  .addUse(VData)              // vdata
  .addUse(RSrc)               // rsrc
  .addUse(VIndex)             // vindex
  .addUse(VOffset)            // voffset
  .addUse(SOffset)            // soffset
  .addImm(ImmOffset);         // offset(imm)

if (IsTyped)
  MIB.addImm(Format);

MIB.addImm(AuxiliaryData)      // cachepolicy, swizzled buffer(imm)
   .addImm(HasVIndex ? -1 : 0) // idxen(imm)
   .addMemOperand(MMO);

MI.eraseFromParent();
return true;
3724}

3726bool AMDGPULegalizerInfo::legalizeBufferLoad(MachineInstr &MI,
                                           MachineRegisterInfo &MRI,
                                           MachineIRBuilder &B,
                                           bool IsFormat,
                                           bool IsTyped) const {
// FIXME: Verifier should enforce 1 MMO for these intrinsics.
MachineMemOperand *MMO = *MI.memoperands_begin();
const int MemSize = MMO->getSize();
const LLT S32 = LLT::scalar(32);

Register Dst = MI.getOperand(0).getReg();
Register RSrc = MI.getOperand(2).getReg();

// The typed intrinsics add an immediate after the registers.
const unsigned NumVIndexOps = IsTyped ? 8 : 7;

// The struct intrinsic variants add one additional operand over raw.
const bool HasVIndex = MI.getNumOperands() == NumVIndexOps;
Register VIndex;
int OpOffset = 0;
if (HasVIndex) {
  VIndex = MI.getOperand(3).getReg();
  OpOffset = 1;
}

Register VOffset = MI.getOperand(3 + OpOffset).getReg();
Register SOffset = MI.getOperand(4 + OpOffset).getReg();

unsigned Format = 0;
if (IsTyped) {
  Format = MI.getOperand(5 + OpOffset).getImm();
  ++OpOffset;
}

unsigned AuxiliaryData = MI.getOperand(5 + OpOffset).getImm();
unsigned ImmOffset;
unsigned TotalOffset;

LLT Ty = MRI.getType(Dst);
LLT EltTy = Ty.getScalarType();
const bool IsD16 = IsFormat && (EltTy.getSizeInBits() == 16);
const bool Unpacked = ST.hasUnpackedD16VMem();

std::tie(VOffset, ImmOffset, TotalOffset) = splitBufferOffsets(B, VOffset);
if (TotalOffset != 0)
  MMO = B.getMF().getMachineMemOperand(MMO, TotalOffset, MemSize);

unsigned Opc;

if (IsTyped) {
  Opc = IsD16 ? AMDGPU::G_AMDGPU_TBUFFER_LOAD_FORMAT_D16 :
                AMDGPU::G_AMDGPU_TBUFFER_LOAD_FORMAT;
} else if (IsFormat) {
  Opc = IsD16 ? AMDGPU::G_AMDGPU_BUFFER_LOAD_FORMAT_D16 :
                AMDGPU::G_AMDGPU_BUFFER_LOAD_FORMAT;
} else {
  switch (MemSize) {
  case 1:
    Opc = AMDGPU::G_AMDGPU_BUFFER_LOAD_UBYTE;
    break;
  case 2:
    Opc = AMDGPU::G_AMDGPU_BUFFER_LOAD_USHORT;
    break;
  default:
    Opc = AMDGPU::G_AMDGPU_BUFFER_LOAD;
    break;
  }
}

Register LoadDstReg;

bool IsExtLoad = (!IsD16 && MemSize < 4) || (IsD16 && !Ty.isVector());
LLT UnpackedTy = Ty.changeElementSize(32);

if (IsExtLoad)
  LoadDstReg = B.getMRI()->createGenericVirtualRegister(S32);
else if (Unpacked && IsD16 && Ty.isVector())
  LoadDstReg = B.getMRI()->createGenericVirtualRegister(UnpackedTy);
else
  LoadDstReg = Dst;

if (!VIndex)
  VIndex = B.buildConstant(S32, 0).getReg(0);

auto MIB = B.buildInstr(Opc)
  .addDef(LoadDstReg)         // vdata
  .addUse(RSrc)               // rsrc
  .addUse(VIndex)             // vindex
  .addUse(VOffset)            // voffset
  .addUse(SOffset)            // soffset
  .addImm(ImmOffset);         // offset(imm)

if (IsTyped)
  MIB.addImm(Format);

MIB.addImm(AuxiliaryData)      // cachepolicy, swizzled buffer(imm)
   .addImm(HasVIndex ? -1 : 0) // idxen(imm)
   .addMemOperand(MMO);

if (LoadDstReg != Dst) {
  B.setInsertPt(B.getMBB(), ++B.getInsertPt());

  // Widen result for extending loads was widened.
  if (IsExtLoad)
    B.buildTrunc(Dst, LoadDstReg);
  else {
    // Repack to original 16-bit vector result
    // FIXME: G_TRUNC should work, but legalization currently fails
    auto Unmerge = B.buildUnmerge(S32, LoadDstReg);
    SmallVector<Register, 4> Repack;
    for (unsigned I = 0, N = Unmerge->getNumOperands() - 1; I != N; ++I)
      Repack.push_back(B.buildTrunc(EltTy, Unmerge.getReg(I)).getReg(0));
    B.buildMerge(Dst, Repack);
  }
}

MI.eraseFromParent();
return true;
3844}

3846bool AMDGPULegalizerInfo::legalizeAtomicIncDec(MachineInstr &MI,
                                             MachineIRBuilder &B,
                                             bool IsInc) const {
unsigned Opc = IsInc ? AMDGPU::G_AMDGPU_ATOMIC_INC :
                       AMDGPU::G_AMDGPU_ATOMIC_DEC;
B.buildInstr(Opc)
  .addDef(MI.getOperand(0).getReg())
  .addUse(MI.getOperand(2).getReg())
  .addUse(MI.getOperand(3).getReg())
  .cloneMemRefs(MI);
MI.eraseFromParent();
return true;
3858}

3860static unsigned getBufferAtomicPseudo(Intrinsic::ID IntrID) {
switch (IntrID) {
case Intrinsic::amdgcn_raw_buffer_atomic_swap:
case Intrinsic::amdgcn_struct_buffer_atomic_swap:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_SWAP;
case Intrinsic::amdgcn_raw_buffer_atomic_add:
case Intrinsic::amdgcn_struct_buffer_atomic_add:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_ADD;
case Intrinsic::amdgcn_raw_buffer_atomic_sub:
case Intrinsic::amdgcn_struct_buffer_atomic_sub:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_SUB;
case Intrinsic::amdgcn_raw_buffer_atomic_smin:
case Intrinsic::amdgcn_struct_buffer_atomic_smin:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_SMIN;
case Intrinsic::amdgcn_raw_buffer_atomic_umin:
case Intrinsic::amdgcn_struct_buffer_atomic_umin:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_UMIN;
case Intrinsic::amdgcn_raw_buffer_atomic_smax:
case Intrinsic::amdgcn_struct_buffer_atomic_smax:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_SMAX;
case Intrinsic::amdgcn_raw_buffer_atomic_umax:
case Intrinsic::amdgcn_struct_buffer_atomic_umax:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_UMAX;
case Intrinsic::amdgcn_raw_buffer_atomic_and:
case Intrinsic::amdgcn_struct_buffer_atomic_and:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_AND;
case Intrinsic::amdgcn_raw_buffer_atomic_or:
case Intrinsic::amdgcn_struct_buffer_atomic_or:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_OR;
case Intrinsic::amdgcn_raw_buffer_atomic_xor:
case Intrinsic::amdgcn_struct_buffer_atomic_xor:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_XOR;
case Intrinsic::amdgcn_raw_buffer_atomic_inc:
case Intrinsic::amdgcn_struct_buffer_atomic_inc:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_INC;
case Intrinsic::amdgcn_raw_buffer_atomic_dec:
case Intrinsic::amdgcn_struct_buffer_atomic_dec:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_DEC;
case Intrinsic::amdgcn_raw_buffer_atomic_cmpswap:
case Intrinsic::amdgcn_struct_buffer_atomic_cmpswap:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_CMPSWAP;
case Intrinsic::amdgcn_raw_buffer_atomic_fadd:
case Intrinsic::amdgcn_struct_buffer_atomic_fadd:
  return AMDGPU::G_AMDGPU_BUFFER_ATOMIC_FADD;
default:
  llvm_unreachable("unhandled atomic opcode")::llvm::llvm_unreachable_internal("unhandled atomic opcode", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 3905);
}
3907}

3909bool AMDGPULegalizerInfo::legalizeBufferAtomic(MachineInstr &MI,
                                             MachineIRBuilder &B,
                                             Intrinsic::ID IID) const {
const bool IsCmpSwap = IID == Intrinsic::amdgcn_raw_buffer_atomic_cmpswap ||
                       IID == Intrinsic::amdgcn_struct_buffer_atomic_cmpswap;
const bool HasReturn = MI.getNumExplicitDefs() != 0;

Register Dst;

int OpOffset = 0;
if (HasReturn) {
  // A few FP atomics do not support return values.
  Dst = MI.getOperand(0).getReg();
} else {
  OpOffset = -1;
}

Register VData = MI.getOperand(2 + OpOffset).getReg();
Register CmpVal;

if (IsCmpSwap) {
  CmpVal = MI.getOperand(3 + OpOffset).getReg();
  ++OpOffset;
}

Register RSrc = MI.getOperand(3 + OpOffset).getReg();
const unsigned NumVIndexOps = (IsCmpSwap ? 8 : 7) + HasReturn;

// The struct intrinsic variants add one additional operand over raw.
const bool HasVIndex = MI.getNumOperands() == NumVIndexOps;
Register VIndex;
if (HasVIndex) {
  VIndex = MI.getOperand(4 + OpOffset).getReg();
  ++OpOffset;
}

Register VOffset = MI.getOperand(4 + OpOffset).getReg();
Register SOffset = MI.getOperand(5 + OpOffset).getReg();
unsigned AuxiliaryData = MI.getOperand(6 + OpOffset).getImm();

MachineMemOperand *MMO = *MI.memoperands_begin();

unsigned ImmOffset;
unsigned TotalOffset;
std::tie(VOffset, ImmOffset, TotalOffset) = splitBufferOffsets(B, VOffset);
if (TotalOffset != 0)
  MMO = B.getMF().getMachineMemOperand(MMO, TotalOffset, MMO->getSize());

if (!VIndex)
  VIndex = B.buildConstant(LLT::scalar(32), 0).getReg(0);

auto MIB = B.buildInstr(getBufferAtomicPseudo(IID));

if (HasReturn)
  MIB.addDef(Dst);

MIB.addUse(VData); // vdata

if (IsCmpSwap)
  MIB.addReg(CmpVal);

MIB.addUse(RSrc)               // rsrc
   .addUse(VIndex)             // vindex
   .addUse(VOffset)            // voffset
   .addUse(SOffset)            // soffset
   .addImm(ImmOffset)          // offset(imm)
   .addImm(AuxiliaryData)      // cachepolicy, swizzled buffer(imm)
   .addImm(HasVIndex ? -1 : 0) // idxen(imm)
   .addMemOperand(MMO);

MI.eraseFromParent();
return true;
3981}

3983/// Turn a set of s16 typed registers in \p A16AddrRegs into a dword sized
3984/// vector with s16 typed elements.
3985static void packImageA16AddressToDwords(
  MachineIRBuilder &B, MachineInstr &MI,
  SmallVectorImpl<Register> &PackedAddrs, unsigned ArgOffset,
  const AMDGPU::ImageDimIntrinsicInfo *Intr, unsigned EndIdx) {
const LLT S16 = LLT::scalar(16);
const LLT V2S16 = LLT::vector(2, 16);

for (unsigned I = Intr->VAddrStart; I < EndIdx; I++) {
  MachineOperand &SrcOp = MI.getOperand(ArgOffset + I);
  if (!SrcOp.isReg())
    continue; // _L to _LZ may have eliminated this.

  Register AddrReg = SrcOp.getReg();

  if (I < Intr->GradientStart) {
    AddrReg = B.buildBitcast(V2S16, AddrReg).getReg(0);
    PackedAddrs.push_back(AddrReg);
  } else {
    // Dz/dh, dz/dv and the last odd coord are packed with undef. Also, in 1D,
    // derivatives dx/dh and dx/dv are packed with undef.
    if (((I + 1) >= EndIdx) ||
        ((Intr->NumGradients / 2) % 2 == 1 &&
         (I == static_cast<unsigned>(Intr->GradientStart +
                                     (Intr->NumGradients / 2) - 1) ||
          I == static_cast<unsigned>(Intr->GradientStart +
                                     Intr->NumGradients - 1))) ||
        // Check for _L to _LZ optimization
        !MI.getOperand(ArgOffset + I + 1).isReg()) {
      PackedAddrs.push_back(
          B.buildBuildVector(V2S16, {AddrReg, B.buildUndef(S16).getReg(0)})
              .getReg(0));
    } else {
      PackedAddrs.push_back(
          B.buildBuildVector(
               V2S16, {AddrReg, MI.getOperand(ArgOffset + I + 1).getReg()})
              .getReg(0));
      ++I;
    }
  }
}
4025}

4027/// Convert from separate vaddr components to a single vector address register,
4028/// and replace the remaining operands with $noreg.
4029static void convertImageAddrToPacked(MachineIRBuilder &B, MachineInstr &MI,
                                   int DimIdx, int NumVAddrs) {
const LLT S32 = LLT::scalar(32);

SmallVector<Register, 8> AddrRegs;
for (int I = 0; I != NumVAddrs; ++I) {
  MachineOperand &SrcOp = MI.getOperand(DimIdx + I);
  if (SrcOp.isReg()) {
    AddrRegs.push_back(SrcOp.getReg());
    assert(B.getMRI()->getType(SrcOp.getReg()) == S32)((B.getMRI()->getType(SrcOp.getReg()) == S32) ? static_cast
<void> (0) : __assert_fail ("B.getMRI()->getType(SrcOp.getReg()) == S32"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 4038, __PRETTY_FUNCTION__));
  }
}

int NumAddrRegs = AddrRegs.size();
if (NumAddrRegs != 1) {
  // Round up to 8 elements for v5-v7
  // FIXME: Missing intermediate sized register classes and instructions.
  if (NumAddrRegs > 4 && !isPowerOf2_32(NumAddrRegs)) {
    const int RoundedNumRegs = NextPowerOf2(NumAddrRegs);
    auto Undef = B.buildUndef(S32);
    AddrRegs.append(RoundedNumRegs - NumAddrRegs, Undef.getReg(0));
    NumAddrRegs = RoundedNumRegs;
  }

  auto VAddr = B.buildBuildVector(LLT::vector(NumAddrRegs, 32), AddrRegs);
  MI.getOperand(DimIdx).setReg(VAddr.getReg(0));
}

for (int I = 1; I != NumVAddrs; ++I) {
  MachineOperand &SrcOp = MI.getOperand(DimIdx + I);
  if (SrcOp.isReg())
    MI.getOperand(DimIdx + I).setReg(AMDGPU::NoRegister);
}
4062}

4064/// Rewrite image intrinsics to use register layouts expected by the subtarget.
4065///
4066/// Depending on the subtarget, load/store with 16-bit element data need to be
4067/// rewritten to use the low half of 32-bit registers, or directly use a packed
4068/// layout. 16-bit addresses should also sometimes be packed into 32-bit
4069/// registers.
4070///
4071/// We don't want to directly select image instructions just yet, but also want
4072/// to exposes all register repacking to the legalizer/combiners. We also don't
4073/// want a selected instrution entering RegBankSelect. In order to avoid
4074/// defining a multitude of intermediate image instructions, directly hack on
4075/// the intrinsic's arguments. In cases like a16 addreses, this requires padding
4076/// now unnecessary arguments with $noreg.
4077bool AMDGPULegalizerInfo::legalizeImageIntrinsic(
  MachineInstr &MI, MachineIRBuilder &B, GISelChangeObserver &Observer,
  const AMDGPU::ImageDimIntrinsicInfo *Intr) const {

const unsigned NumDefs = MI.getNumExplicitDefs();
const unsigned ArgOffset = NumDefs + 1;
bool IsTFE = NumDefs == 2;
// We are only processing the operands of d16 image operations on subtargets
// that use the unpacked register layout, or need to repack the TFE result.

// TODO: Do we need to guard against already legalized intrinsics?
const AMDGPU::MIMGBaseOpcodeInfo *BaseOpcode =
    AMDGPU::getMIMGBaseOpcodeInfo(Intr->BaseOpcode);

MachineRegisterInfo *MRI = B.getMRI();
const LLT S32 = LLT::scalar(32);
const LLT S16 = LLT::scalar(16);
const LLT V2S16 = LLT::vector(2, 16);

unsigned DMask = 0;

// Check for 16 bit addresses and pack if true.
LLT GradTy =
    MRI->getType(MI.getOperand(ArgOffset + Intr->GradientStart).getReg());
LLT AddrTy =
    MRI->getType(MI.getOperand(ArgOffset + Intr->CoordStart).getReg());
const bool IsG16 = GradTy == S16;
const bool IsA16 = AddrTy == S16;

int DMaskLanes = 0;
if (!BaseOpcode->Atomic) {
  DMask = MI.getOperand(ArgOffset + Intr->DMaskIndex).getImm();
  if (BaseOpcode->Gather4) {
    DMaskLanes = 4;
  } else if (DMask != 0) {
    DMaskLanes = countPopulation(DMask);
  } else if (!IsTFE && !BaseOpcode->Store) {
    // If dmask is 0, this is a no-op load. This can be eliminated.
    B.buildUndef(MI.getOperand(0));
    MI.eraseFromParent();
    return true;
  }
}

Observer.changingInstr(MI);
auto ChangedInstr = make_scope_exit([&] { Observer.changedInstr(MI); });

unsigned NewOpcode = NumDefs == 0 ?
  AMDGPU::G_AMDGPU_INTRIN_IMAGE_STORE : AMDGPU::G_AMDGPU_INTRIN_IMAGE_LOAD;

// Track that we legalized this
MI.setDesc(B.getTII().get(NewOpcode));

// Expecting to get an error flag since TFC is on - and dmask is 0 Force
// dmask to be at least 1 otherwise the instruction will fail
if (IsTFE && DMask == 0) {
  DMask = 0x1;
  DMaskLanes = 1;
  MI.getOperand(ArgOffset + Intr->DMaskIndex).setImm(DMask);
}

if (BaseOpcode->Atomic) {
  Register VData0 = MI.getOperand(2).getReg();
  LLT Ty = MRI->getType(VData0);

  // TODO: Allow atomic swap and bit ops for v2s16/v4s16
  if (Ty.isVector())
    return false;

  if (BaseOpcode->AtomicX2) {
    Register VData1 = MI.getOperand(3).getReg();
    // The two values are packed in one register.
    LLT PackedTy = LLT::vector(2, Ty);
    auto Concat = B.buildBuildVector(PackedTy, {VData0, VData1});
    MI.getOperand(2).setReg(Concat.getReg(0));
    MI.getOperand(3).setReg(AMDGPU::NoRegister);
  }
}

unsigned CorrectedNumVAddrs = Intr->NumVAddrs;

// Optimize _L to _LZ when _L is zero
if (const AMDGPU::MIMGLZMappingInfo *LZMappingInfo =
        AMDGPU::getMIMGLZMappingInfo(Intr->BaseOpcode)) {
  const ConstantFP *ConstantLod;

  if (mi_match(MI.getOperand(ArgOffset + Intr->LodIndex).getReg(), *MRI,
               m_GFCst(ConstantLod))) {
    if (ConstantLod->isZero() || ConstantLod->isNegative()) {
      // Set new opcode to _lz variant of _l, and change the intrinsic ID.
      const AMDGPU::ImageDimIntrinsicInfo *NewImageDimIntr =
          AMDGPU::getImageDimInstrinsicByBaseOpcode(LZMappingInfo->LZ,
                                                    Intr->Dim);

      // The starting indexes should remain in the same place.
      --CorrectedNumVAddrs;

      MI.getOperand(MI.getNumExplicitDefs())
          .setIntrinsicID(static_cast<Intrinsic::ID>(NewImageDimIntr->Intr));
      MI.RemoveOperand(ArgOffset + Intr->LodIndex);
      Intr = NewImageDimIntr;
    }
  }
}

// Optimize _mip away, when 'lod' is zero
if (AMDGPU::getMIMGMIPMappingInfo(Intr->BaseOpcode)) {
  int64_t ConstantLod;
  if (mi_match(MI.getOperand(ArgOffset + Intr->MipIndex).getReg(), *MRI,
               m_ICst(ConstantLod))) {
    if (ConstantLod == 0) {
      // TODO: Change intrinsic opcode and remove operand instead or replacing
      // it with 0, as the _L to _LZ handling is done above.
      MI.getOperand(ArgOffset + Intr->MipIndex).ChangeToImmediate(0);
      --CorrectedNumVAddrs;
    }
  }
}

// Rewrite the addressing register layout before doing anything else.
if (IsA16 || IsG16) {
  if (IsA16) {
    // Target must support the feature and gradients need to be 16 bit too
    if (!ST.hasA16() || !IsG16)
      return false;
  } else if (!ST.hasG16())
    return false;

  if (Intr->NumVAddrs > 1) {
    SmallVector<Register, 4> PackedRegs;
    // Don't compress addresses for G16
    const int PackEndIdx = IsA16 ? Intr->VAddrEnd : Intr->CoordStart;
    packImageA16AddressToDwords(B, MI, PackedRegs, ArgOffset, Intr,
                                PackEndIdx);

    if (!IsA16) {
      // Add uncompressed address
      for (unsigned I = Intr->CoordStart; I < Intr->VAddrEnd; I++) {
        int AddrReg = MI.getOperand(ArgOffset + I).getReg();
        assert(B.getMRI()->getType(AddrReg) == LLT::scalar(32))((B.getMRI()->getType(AddrReg) == LLT::scalar(32)) ? static_cast
<void> (0) : __assert_fail ("B.getMRI()->getType(AddrReg) == LLT::scalar(32)"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 4216, __PRETTY_FUNCTION__));
        PackedRegs.push_back(AddrReg);
      }
    }

    // See also below in the non-a16 branch
    const bool UseNSA = PackedRegs.size() >= 3 && ST.hasNSAEncoding();

    if (!UseNSA && PackedRegs.size() > 1) {
      LLT PackedAddrTy = LLT::vector(2 * PackedRegs.size(), 16);
      auto Concat = B.buildConcatVectors(PackedAddrTy, PackedRegs);
      PackedRegs[0] = Concat.getReg(0);
      PackedRegs.resize(1);
    }

    const unsigned NumPacked = PackedRegs.size();
    for (unsigned I = Intr->VAddrStart; I < Intr->VAddrEnd; I++) {
      MachineOperand &SrcOp = MI.getOperand(ArgOffset + I);
      if (!SrcOp.isReg()) {
        assert(SrcOp.isImm() && SrcOp.getImm() == 0)((SrcOp.isImm() && SrcOp.getImm() == 0) ? static_cast
<void> (0) : __assert_fail ("SrcOp.isImm() && SrcOp.getImm() == 0"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 4235, __PRETTY_FUNCTION__));
        continue;
      }

      assert(SrcOp.getReg() != AMDGPU::NoRegister)((SrcOp.getReg() != AMDGPU::NoRegister) ? static_cast<void
> (0) : __assert_fail ("SrcOp.getReg() != AMDGPU::NoRegister"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 4239, __PRETTY_FUNCTION__));

      if (I - Intr->VAddrStart < NumPacked)
        SrcOp.setReg(PackedRegs[I - Intr->VAddrStart]);
      else
        SrcOp.setReg(AMDGPU::NoRegister);
    }
  }
} else {
  // If the register allocator cannot place the address registers contiguously
  // without introducing moves, then using the non-sequential address encoding
  // is always preferable, since it saves VALU instructions and is usually a
  // wash in terms of code size or even better.
  //
  // However, we currently have no way of hinting to the register allocator
  // that MIMG addresses should be placed contiguously when it is possible to
  // do so, so force non-NSA for the common 2-address case as a heuristic.
  //
  // SIShrinkInstructions will convert NSA encodings to non-NSA after register
  // allocation when possible.
  const bool UseNSA = CorrectedNumVAddrs >= 3 && ST.hasNSAEncoding();

  if (!UseNSA && Intr->NumVAddrs > 1)
    convertImageAddrToPacked(B, MI, ArgOffset + Intr->VAddrStart,
                             Intr->NumVAddrs);
}

int Flags = 0;
if (IsA16)
  Flags |= 1;
if (IsG16)
  Flags |= 2;
MI.addOperand(MachineOperand::CreateImm(Flags));

if (BaseOpcode->Store) { // No TFE for stores?
  // TODO: Handle dmask trim
  Register VData = MI.getOperand(1).getReg();
  LLT Ty = MRI->getType(VData);
  if (!Ty.isVector() || Ty.getElementType() != S16)
    return true;

  Register RepackedReg = handleD16VData(B, *MRI, VData, true);
  if (RepackedReg != VData) {
    MI.getOperand(1).setReg(RepackedReg);
  }

  return true;
}

Register DstReg = MI.getOperand(0).getReg();
LLT Ty = MRI->getType(DstReg);
const LLT EltTy = Ty.getScalarType();
const bool IsD16 = Ty.getScalarType() == S16;
const int NumElts = Ty.isVector() ? Ty.getNumElements() : 1;

// Confirm that the return type is large enough for the dmask specified
if (NumElts < DMaskLanes)
  return false;

if (NumElts > 4 || DMaskLanes > 4)
  return false;

const unsigned AdjustedNumElts = DMaskLanes == 0 ? 1 : DMaskLanes;
const LLT AdjustedTy = Ty.changeNumElements(AdjustedNumElts);

// The raw dword aligned data component of the load. The only legal cases
// where this matters should be when using the packed D16 format, for
// s16 -> <2 x s16>, and <3 x s16> -> <4 x s16>,
LLT RoundedTy;

// S32 vector to to cover all data, plus TFE result element.
LLT TFETy;

// Register type to use for each loaded component. Will be S32 or V2S16.
LLT RegTy;

if (IsD16 && ST.hasUnpackedD16VMem()) {
  RoundedTy = LLT::scalarOrVector(AdjustedNumElts, 32);
  TFETy = LLT::vector(AdjustedNumElts + 1, 32);
  RegTy = S32;
} else {
  unsigned EltSize = EltTy.getSizeInBits();
  unsigned RoundedElts = (AdjustedTy.getSizeInBits() + 31) / 32;
  unsigned RoundedSize = 32 * RoundedElts;
  RoundedTy = LLT::scalarOrVector(RoundedSize / EltSize, EltSize);
  TFETy = LLT::vector(RoundedSize / 32 + 1, S32);
  RegTy = !IsTFE && EltSize == 16 ? V2S16 : S32;
}

// The return type does not need adjustment.
// TODO: Should we change s16 case to s32 or <2 x s16>?
if (!IsTFE && (RoundedTy == Ty || !Ty.isVector()))
  return true;

Register Dst1Reg;

// Insert after the instruction.
B.setInsertPt(*MI.getParent(), ++MI.getIterator());

// TODO: For TFE with d16, if we used a TFE type that was a multiple of <2 x
// s16> instead of s32, we would only need 1 bitcast instead of multiple.
const LLT LoadResultTy = IsTFE ? TFETy : RoundedTy;
const int ResultNumRegs = LoadResultTy.getSizeInBits() / 32;

Register NewResultReg = MRI->createGenericVirtualRegister(LoadResultTy);

MI.getOperand(0).setReg(NewResultReg);

// In the IR, TFE is supposed to be used with a 2 element struct return
// type. The intruction really returns these two values in one contiguous
// register, with one additional dword beyond the loaded data. Rewrite the
// return type to use a single register result.

if (IsTFE) {
  Dst1Reg = MI.getOperand(1).getReg();
  if (MRI->getType(Dst1Reg) != S32)
    return false;

  // TODO: Make sure the TFE operand bit is set.
  MI.RemoveOperand(1);

  // Handle the easy case that requires no repack instructions.
  if (Ty == S32) {
    B.buildUnmerge({DstReg, Dst1Reg}, NewResultReg);
    return true;
  }
}

// Now figure out how to copy the new result register back into the old
// result.
SmallVector<Register, 5> ResultRegs(ResultNumRegs, Dst1Reg);

const int NumDataRegs = IsTFE ? ResultNumRegs - 1  : ResultNumRegs;

if (ResultNumRegs == 1) {
  assert(!IsTFE)((!IsTFE) ? static_cast<void> (0) : __assert_fail ("!IsTFE"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 4374, __PRETTY_FUNCTION__));
  ResultRegs[0] = NewResultReg;
} else {
  // We have to repack into a new vector of some kind.
  for (int I = 0; I != NumDataRegs; ++I)
    ResultRegs[I] = MRI->createGenericVirtualRegister(RegTy);
  B.buildUnmerge(ResultRegs, NewResultReg);

  // Drop the final TFE element to get the data part. The TFE result is
  // directly written to the right place already.
  if (IsTFE)
    ResultRegs.resize(NumDataRegs);
}

// For an s16 scalar result, we form an s32 result with a truncate regardless
// of packed vs. unpacked.
if (IsD16 && !Ty.isVector()) {
  B.buildTrunc(DstReg, ResultRegs[0]);
  return true;
}

// Avoid a build/concat_vector of 1 entry.
if (Ty == V2S16 && NumDataRegs == 1 && !ST.hasUnpackedD16VMem()) {
  B.buildBitcast(DstReg, ResultRegs[0]);
  return true;
}

assert(Ty.isVector())((Ty.isVector()) ? static_cast<void> (0) : __assert_fail
 ("Ty.isVector()", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 4401, __PRETTY_FUNCTION__));

if (IsD16) {
  // For packed D16 results with TFE enabled, all the data components are
  // S32. Cast back to the expected type.
  //
  // TODO: We don't really need to use load s32 elements. We would only need one
  // cast for the TFE result if a multiple of v2s16 was used.
  if (RegTy != V2S16 && !ST.hasUnpackedD16VMem()) {
    for (Register &Reg : ResultRegs)
      Reg = B.buildBitcast(V2S16, Reg).getReg(0);
  } else if (ST.hasUnpackedD16VMem()) {
    for (Register &Reg : ResultRegs)
      Reg = B.buildTrunc(S16, Reg).getReg(0);
  }
}

auto padWithUndef = [&](LLT Ty, int NumElts) {
  if (NumElts == 0)
    return;
  Register Undef = B.buildUndef(Ty).getReg(0);
  for (int I = 0; I != NumElts; ++I)
    ResultRegs.push_back(Undef);
};

// Pad out any elements eliminated due to the dmask.
LLT ResTy = MRI->getType(ResultRegs[0]);
if (!ResTy.isVector()) {
  padWithUndef(ResTy, NumElts - ResultRegs.size());
  B.buildBuildVector(DstReg, ResultRegs);
  return true;
}

assert(!ST.hasUnpackedD16VMem() && ResTy == V2S16)((!ST.hasUnpackedD16VMem() && ResTy == V2S16) ? static_cast
<void> (0) : __assert_fail ("!ST.hasUnpackedD16VMem() && ResTy == V2S16"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp"
, 4434, __PRETTY_FUNCTION__));
const int RegsToCover = (Ty.getSizeInBits() + 31) / 32;

// Deal with the one annoying legal case.
const LLT V3S16 = LLT::vector(3, 16);
if (Ty == V3S16) {
  padWithUndef(ResTy, RegsToCover - ResultRegs.size() + 1);
  auto Concat = B.buildConcatVectors(LLT::vector(6, 16), ResultRegs);
  B.buildUnmerge({DstReg, MRI->createGenericVirtualRegister(V3S16)}, Concat);
  return true;
}

padWithUndef(ResTy, RegsToCover - ResultRegs.size());
B.buildConcatVectors(DstReg, ResultRegs);
return true;
4449}

4451bool AMDGPULegalizerInfo::legalizeSBufferLoad(
LegalizerHelper &Helper, MachineInstr &MI) const {
MachineIRBuilder &B = Helper.MIRBuilder;
GISelChangeObserver &Observer = Helper.Observer;

Register Dst = MI.getOperand(0).getReg();
LLT Ty = B.getMRI()->getType(Dst);
unsigned Size = Ty.getSizeInBits();
MachineFunction &MF = B.getMF();

Observer.changingInstr(MI);

if (shouldBitcastLoadStoreType(ST, Ty, Size)) {
  Ty = getBitcastRegisterType(Ty);
  Helper.bitcastDst(MI, Ty, 0);
  Dst = MI.getOperand(0).getReg();
  B.setInsertPt(B.getMBB(), MI);
}

// FIXME: We don't really need this intermediate instruction. The intrinsic
// should be fixed to have a memory operand. Since it's readnone, we're not
// allowed to add one.
MI.setDesc(B.getTII().get(AMDGPU::G_AMDGPU_S_BUFFER_LOAD));
MI.RemoveOperand(1); // Remove intrinsic ID

// FIXME: When intrinsic definition is fixed, this should have an MMO already.
// TODO: Should this use datalayout alignment?
const unsigned MemSize = (Size + 7) / 8;
const Align MemAlign(4);
MachineMemOperand *MMO = MF.getMachineMemOperand(
    MachinePointerInfo(),
    MachineMemOperand::MOLoad | MachineMemOperand::MODereferenceable |
        MachineMemOperand::MOInvariant,
    MemSize, MemAlign);
MI.addMemOperand(MF, MMO);

// There are no 96-bit result scalar loads, but widening to 128-bit should
// always be legal. We may need to restore this to a 96-bit result if it turns
// out this needs to be converted to a vector load during RegBankSelect.
if (!isPowerOf2_32(Size)) {
  if (Ty.isVector())
    Helper.moreElementsVectorDst(MI, getPow2VectorType(Ty), 0);
  else
    Helper.widenScalarDst(MI, getPow2ScalarType(Ty), 0);
}

Observer.changedInstr(MI);
return true;
4499}

4501// TODO: Move to selection
4502bool AMDGPULegalizerInfo::legalizeTrapIntrinsic(MachineInstr &MI,
                                              MachineRegisterInfo &MRI,
                                              MachineIRBuilder &B) const {
// Is non-HSA path or trap-handler disabled? then, insert s_endpgm instruction
if (ST.getTrapHandlerAbi() != GCNSubtarget::TrapHandlerAbiHsa ||
    !ST.isTrapHandlerEnabled()) {
  B.buildInstr(AMDGPU::S_ENDPGM).addImm(0);
} else {
  // Pass queue pointer to trap handler as input, and insert trap instruction
  // Reference: https://llvm.org/docs/AMDGPUUsage.html#trap-handler-abi
  MachineRegisterInfo &MRI = *B.getMRI();

  Register LiveIn =
    MRI.createGenericVirtualRegister(LLT::pointer(AMDGPUAS::CONSTANT_ADDRESS, 64));
  if (!loadInputValue(LiveIn, B, AMDGPUFunctionArgInfo::QUEUE_PTR))
    return false;

  Register SGPR01(AMDGPU::SGPR0_SGPR1);
  B.buildCopy(SGPR01, LiveIn);
  B.buildInstr(AMDGPU::S_TRAP)
      .addImm(GCNSubtarget::TrapIDLLVMTrap)
      .addReg(SGPR01, RegState::Implicit);
}

MI.eraseFromParent();
return true;
4528}

4530bool AMDGPULegalizerInfo::legalizeDebugTrapIntrinsic(
  MachineInstr &MI, MachineRegisterInfo &MRI, MachineIRBuilder &B) const {
// Is non-HSA path or trap-handler disabled? then, report a warning
// accordingly
if (ST.getTrapHandlerAbi() != GCNSubtarget::TrapHandlerAbiHsa ||
    !ST.isTrapHandlerEnabled()) {
  DiagnosticInfoUnsupported NoTrap(B.getMF().getFunction(),
                                   "debugtrap handler not supported",
                                   MI.getDebugLoc(), DS_Warning);
  LLVMContext &Ctx = B.getMF().getFunction().getContext();
  Ctx.diagnose(NoTrap);
} else {
  // Insert debug-trap instruction
  B.buildInstr(AMDGPU::S_TRAP).addImm(GCNSubtarget::TrapIDLLVMDebugTrap);
}

MI.eraseFromParent();
return true;
4548}

4550bool AMDGPULegalizerInfo::legalizeBVHIntrinsic(MachineInstr &MI,
                                             MachineIRBuilder &B) const {
MachineRegisterInfo &MRI = *B.getMRI();
const LLT S16 = LLT::scalar(16);
const LLT S32 = LLT::scalar(32);

Register DstReg = MI.getOperand(0).getReg();
Register NodePtr = MI.getOperand(2).getReg();
Register RayExtent = MI.getOperand(3).getReg();
Register RayOrigin = MI.getOperand(4).getReg();
Register RayDir = MI.getOperand(5).getReg();
Register RayInvDir = MI.getOperand(6).getReg();
Register TDescr = MI.getOperand(7).getReg();

bool IsA16 = MRI.getType(RayDir).getElementType().getSizeInBits() == 16;
bool Is64 =  MRI.getType(NodePtr).getSizeInBits() == 64;
unsigned Opcode = IsA16 ? Is64 ? AMDGPU::IMAGE_BVH64_INTERSECT_RAY_a16_nsa
                               : AMDGPU::IMAGE_BVH_INTERSECT_RAY_a16_nsa
                        : Is64 ? AMDGPU::IMAGE_BVH64_INTERSECT_RAY_nsa
                               : AMDGPU::IMAGE_BVH_INTERSECT_RAY_nsa;

SmallVector<Register, 12> Ops;
if (Is64) {
  auto Unmerge = B.buildUnmerge({S32, S32}, NodePtr);
  Ops.push_back(Unmerge.getReg(0));
  Ops.push_back(Unmerge.getReg(1));
} else {
  Ops.push_back(NodePtr);
}
Ops.push_back(RayExtent);

auto packLanes = [&Ops, &S32, &B] (Register Src) {
  auto Unmerge = B.buildUnmerge({S32, S32, S32, S32}, Src);
  Ops.push_back(Unmerge.getReg(0));
  Ops.push_back(Unmerge.getReg(1));
  Ops.push_back(Unmerge.getReg(2));
};

packLanes(RayOrigin);
if (IsA16) {
  auto UnmergeRayDir = B.buildUnmerge({S16, S16, S16, S16}, RayDir);
  auto UnmergeRayInvDir = B.buildUnmerge({S16, S16, S16, S16}, RayInvDir);
  Register R1 = MRI.createGenericVirtualRegister(S32);
  Register R2 = MRI.createGenericVirtualRegister(S32);
  Register R3 = MRI.createGenericVirtualRegister(S32);
  B.buildMerge(R1, {UnmergeRayDir.getReg(0), UnmergeRayDir.getReg(1)});
  B.buildMerge(R2, {UnmergeRayDir.getReg(2), UnmergeRayInvDir.getReg(0)});
  B.buildMerge(R3, {UnmergeRayInvDir.getReg(1), UnmergeRayInvDir.getReg(2)});
  Ops.push_back(R1);
  Ops.push_back(R2);
  Ops.push_back(R3);
} else {
  packLanes(RayDir);
  packLanes(RayInvDir);
}

auto MIB = B.buildInstr(AMDGPU::G_AMDGPU_INTRIN_BVH_INTERSECT_RAY)
  .addDef(DstReg)
  .addImm(Opcode);

for (Register R : Ops) {
  MIB.addUse(R);
}

MIB.addUse(TDescr)
   .addImm(IsA16 ? 1 : 0)
   .cloneMemRefs(MI);

MI.eraseFromParent();
return true;
4620}

4622bool AMDGPULegalizerInfo::legalizeIntrinsic(LegalizerHelper &Helper,
                                          MachineInstr &MI) const {
MachineIRBuilder &B = Helper.MIRBuilder;
MachineRegisterInfo &MRI = *B.getMRI();

// Replace the use G_BRCOND with the exec manipulate and branch pseudos.
auto IntrID = MI.getIntrinsicID();
switch (IntrID) {
1
Control jumps to 'case amdgcn_dispatch_id:'  at line 4751→
case Intrinsic::amdgcn_if:
case Intrinsic::amdgcn_else: {
  MachineInstr *Br = nullptr;
  MachineBasicBlock *UncondBrTarget = nullptr;
  bool Negated = false;
  if (MachineInstr *BrCond =
          verifyCFIntrinsic(MI, MRI, Br, UncondBrTarget, Negated)) {
    const SIRegisterInfo *TRI
      = static_cast<const SIRegisterInfo *>(MRI.getTargetRegisterInfo());

    Register Def = MI.getOperand(1).getReg();
    Register Use = MI.getOperand(3).getReg();

    MachineBasicBlock *CondBrTarget = BrCond->getOperand(1).getMBB();

    if (Negated)
      std::swap(CondBrTarget, UncondBrTarget);

    B.setInsertPt(B.getMBB(), BrCond->getIterator());
    if (IntrID == Intrinsic::amdgcn_if) {
      B.buildInstr(AMDGPU::SI_IF)
        .addDef(Def)
        .addUse(Use)
        .addMBB(UncondBrTarget);
    } else {
      B.buildInstr(AMDGPU::SI_ELSE)
          .addDef(Def)
          .addUse(Use)
          .addMBB(UncondBrTarget);
    }

    if (Br) {
      Br->getOperand(0).setMBB(CondBrTarget);
    } else {
      // The IRTranslator skips inserting the G_BR for fallthrough cases, but
      // since we're swapping branch targets it needs to be reinserted.
      // FIXME: IRTranslator should probably not do this
      B.buildBr(*CondBrTarget);
    }

    MRI.setRegClass(Def, TRI->getWaveMaskRegClass());
    MRI.setRegClass(Use, TRI->getWaveMaskRegClass());
    MI.eraseFromParent();
    BrCond->eraseFromParent();
    return true;
  }

  return false;
}
case Intrinsic::amdgcn_loop: {
  MachineInstr *Br = nullptr;
  MachineBasicBlock *UncondBrTarget = nullptr;
  bool Negated = false;
  if (MachineInstr *BrCond =
          verifyCFIntrinsic(MI, MRI, Br, UncondBrTarget, Negated)) {
    const SIRegisterInfo *TRI
      = static_cast<const SIRegisterInfo *>(MRI.getTargetRegisterInfo());

    MachineBasicBlock *CondBrTarget = BrCond->getOperand(1).getMBB();
    Register Reg = MI.getOperand(2).getReg();

    if (Negated)
      std::swap(CondBrTarget, UncondBrTarget);

    B.setInsertPt(B.getMBB(), BrCond->getIterator());
    B.buildInstr(AMDGPU::SI_LOOP)
      .addUse(Reg)
      .addMBB(UncondBrTarget);

    if (Br)
      Br->getOperand(0).setMBB(CondBrTarget);
    else
      B.buildBr(*CondBrTarget);

    MI.eraseFromParent();
    BrCond->eraseFromParent();
    MRI.setRegClass(Reg, TRI->getWaveMaskRegClass());
    return true;
  }

  return false;
}
case Intrinsic::amdgcn_kernarg_segment_ptr:
  if (!AMDGPU::isKernel(B.getMF().getFunction().getCallingConv())) {
    // This only makes sense to call in a kernel, so just lower to null.
    B.buildConstant(MI.getOperand(0).getReg(), 0);
    MI.eraseFromParent();
    return true;
  }

  return legalizePreloadedArgIntrin(
    MI, MRI, B, AMDGPUFunctionArgInfo::KERNARG_SEGMENT_PTR);
case Intrinsic::amdgcn_implicitarg_ptr:
  return legalizeImplicitArgPtr(MI, MRI, B);
case Intrinsic::amdgcn_workitem_id_x:
  return legalizePreloadedArgIntrin(MI, MRI, B,
                                    AMDGPUFunctionArgInfo::WORKITEM_ID_X);
case Intrinsic::amdgcn_workitem_id_y:
  return legalizePreloadedArgIntrin(MI, MRI, B,
                                    AMDGPUFunctionArgInfo::WORKITEM_ID_Y);
case Intrinsic::amdgcn_workitem_id_z:
  return legalizePreloadedArgIntrin(MI, MRI, B,
                                    AMDGPUFunctionArgInfo::WORKITEM_ID_Z);
case Intrinsic::amdgcn_workgroup_id_x:
  return legalizePreloadedArgIntrin(MI, MRI, B,
                                    AMDGPUFunctionArgInfo::WORKGROUP_ID_X);
case Intrinsic::amdgcn_workgroup_id_y:
  return legalizePreloadedArgIntrin(MI, MRI, B,
                                    AMDGPUFunctionArgInfo::WORKGROUP_ID_Y);
case Intrinsic::amdgcn_workgroup_id_z:
  return legalizePreloadedArgIntrin(MI, MRI, B,
                                    AMDGPUFunctionArgInfo::WORKGROUP_ID_Z);
case Intrinsic::amdgcn_dispatch_ptr:
  return legalizePreloadedArgIntrin(MI, MRI, B,
                                    AMDGPUFunctionArgInfo::DISPATCH_PTR);
case Intrinsic::amdgcn_queue_ptr:
  return legalizePreloadedArgIntrin(MI, MRI, B,
                                    AMDGPUFunctionArgInfo::QUEUE_PTR);
case Intrinsic::amdgcn_implicit_buffer_ptr:
  return legalizePreloadedArgIntrin(
    MI, MRI, B, AMDGPUFunctionArgInfo::IMPLICIT_BUFFER_PTR);
case Intrinsic::amdgcn_dispatch_id:
  return legalizePreloadedArgIntrin(MI, MRI, B,
2
←
Calling 'AMDGPULegalizerInfo::legalizePreloadedArgIntrin'→
                                    AMDGPUFunctionArgInfo::DISPATCH_ID);
case Intrinsic::amdgcn_fdiv_fast:
  return legalizeFDIVFastIntrin(MI, MRI, B);
case Intrinsic::amdgcn_is_shared:
  return legalizeIsAddrSpace(MI, MRI, B, AMDGPUAS::LOCAL_ADDRESS);
case Intrinsic::amdgcn_is_private:
  return legalizeIsAddrSpace(MI, MRI, B, AMDGPUAS::PRIVATE_ADDRESS);
case Intrinsic::amdgcn_wavefrontsize: {
  B.buildConstant(MI.getOperand(0), ST.getWavefrontSize());
  MI.eraseFromParent();
  return true;
}
case Intrinsic::amdgcn_s_buffer_load:
  return legalizeSBufferLoad(Helper, MI);
case Intrinsic::amdgcn_raw_buffer_store:
case Intrinsic::amdgcn_struct_buffer_store:
  return legalizeBufferStore(MI, MRI, B, false, false);
case Intrinsic::amdgcn_raw_buffer_store_format:
case Intrinsic::amdgcn_struct_buffer_store_format:
  return legalizeBufferStore(MI, MRI, B, false, true);
case Intrinsic::amdgcn_raw_tbuffer_store:
case Intrinsic::amdgcn_struct_tbuffer_store:
  return legalizeBufferStore(MI, MRI, B, true, true);
case Intrinsic::amdgcn_raw_buffer_load:
case Intrinsic::amdgcn_struct_buffer_load:
  return legalizeBufferLoad(MI, MRI, B, false, false);
case Intrinsic::amdgcn_raw_buffer_load_format:
case Intrinsic::amdgcn_struct_buffer_load_format:
  return legalizeBufferLoad(MI, MRI, B, true, false);
case Intrinsic::amdgcn_raw_tbuffer_load:
case Intrinsic::amdgcn_struct_tbuffer_load:
  return legalizeBufferLoad(MI, MRI, B, true, true);
case Intrinsic::amdgcn_raw_buffer_atomic_swap:
case Intrinsic::amdgcn_struct_buffer_atomic_swap:
case Intrinsic::amdgcn_raw_buffer_atomic_add:
case Intrinsic::amdgcn_struct_buffer_atomic_add:
case Intrinsic::amdgcn_raw_buffer_atomic_sub:
case Intrinsic::amdgcn_struct_buffer_atomic_sub:
case Intrinsic::amdgcn_raw_buffer_atomic_smin:
case Intrinsic::amdgcn_struct_buffer_atomic_smin:
case Intrinsic::amdgcn_raw_buffer_atomic_umin:
case Intrinsic::amdgcn_struct_buffer_atomic_umin:
case Intrinsic::amdgcn_raw_buffer_atomic_smax:
case Intrinsic::amdgcn_struct_buffer_atomic_smax:
case Intrinsic::amdgcn_raw_buffer_atomic_umax:
case Intrinsic::amdgcn_struct_buffer_atomic_umax:
case Intrinsic::amdgcn_raw_buffer_atomic_and:
case Intrinsic::amdgcn_struct_buffer_atomic_and:
case Intrinsic::amdgcn_raw_buffer_atomic_or:
case Intrinsic::amdgcn_struct_buffer_atomic_or:
case Intrinsic::amdgcn_raw_buffer_atomic_xor:
case Intrinsic::amdgcn_struct_buffer_atomic_xor:
case Intrinsic::amdgcn_raw_buffer_atomic_inc:
case Intrinsic::amdgcn_struct_buffer_atomic_inc:
case Intrinsic::amdgcn_raw_buffer_atomic_dec:
case Intrinsic::amdgcn_struct_buffer_atomic_dec:
case Intrinsic::amdgcn_raw_buffer_atomic_fadd:
case Intrinsic::amdgcn_struct_buffer_atomic_fadd:
case Intrinsic::amdgcn_raw_buffer_atomic_cmpswap:
case Intrinsic::amdgcn_struct_buffer_atomic_cmpswap:
  return legalizeBufferAtomic(MI, B, IntrID);
case Intrinsic::amdgcn_atomic_inc:
  return legalizeAtomicIncDec(MI, B, true);
case Intrinsic::amdgcn_atomic_dec:
  return legalizeAtomicIncDec(MI, B, false);
case Intrinsic::trap:
  return legalizeTrapIntrinsic(MI, MRI, B);
case Intrinsic::debugtrap:
  return legalizeDebugTrapIntrinsic(MI, MRI, B);
case Intrinsic::amdgcn_rsq_clamp:
  return legalizeRsqClampIntrinsic(MI, MRI, B);
case Intrinsic::amdgcn_ds_fadd:
case Intrinsic::amdgcn_ds_fmin:
case Intrinsic::amdgcn_ds_fmax:
  return legalizeDSAtomicFPIntrinsic(Helper, MI, IntrID);
case Intrinsic::amdgcn_image_bvh_intersect_ray:
  return legalizeBVHIntrinsic(MI, B);
default: {
  if (const AMDGPU::ImageDimIntrinsicInfo *ImageDimIntr =
          AMDGPU::getImageDimIntrinsicInfo(IntrID))
    return legalizeImageIntrinsic(MI, B, Helper.Observer, ImageDimIntr);
  return true;
}
}

return true;
4839}

←

/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.h

→

1//==- AMDGPUArgumentrUsageInfo.h - Function Arg Usage Info -------*- C++ -*-==//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//

9#ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPUARGUMENTUSAGEINFO_H
10#define LLVM_LIB_TARGET_AMDGPU_AMDGPUARGUMENTUSAGEINFO_H

12#include "llvm/CodeGen/Register.h"
13#include "llvm/Pass.h"

15namespace llvm {

17class Function;
18class LLT;
19class raw_ostream;
20class TargetRegisterClass;
21class TargetRegisterInfo;

23struct ArgDescriptor {
24private:
friend struct AMDGPUFunctionArgInfo;
friend class AMDGPUArgumentUsageInfo;

union {
  MCRegister Reg;
  unsigned StackOffset;
};

// Bitmask to locate argument within the register.
unsigned Mask;

bool IsStack : 1;
bool IsSet : 1;

39public:
constexpr ArgDescriptor(unsigned Val = 0, unsigned Mask = ~0u,
              bool IsStack = false, bool IsSet = false)
  : Reg(Val), Mask(Mask), IsStack(IsStack), IsSet(IsSet) {}

static constexpr ArgDescriptor createRegister(Register Reg,
                                              unsigned Mask = ~0u) {
  return ArgDescriptor(Reg, Mask, false, true);
}

static constexpr ArgDescriptor createStack(unsigned Offset,
                                           unsigned Mask = ~0u) {
  return ArgDescriptor(Offset, Mask, true, true);
}

static constexpr ArgDescriptor createArg(const ArgDescriptor &Arg,
                                         unsigned Mask) {
  return ArgDescriptor(Arg.Reg, Mask, Arg.IsStack, Arg.IsSet);
}

bool isSet() const {
  return IsSet;
}

explicit operator bool() const {
  return isSet();
}

bool isRegister() const {
  return !IsStack;
}

MCRegister getRegister() const {
  assert(!IsStack)((!IsStack) ? static_cast<void> (0) : __assert_fail ("!IsStack"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.h"
, 72, __PRETTY_FUNCTION__));
  return Reg;
}

unsigned getStackOffset() const {
  assert(IsStack)((IsStack) ? static_cast<void> (0) : __assert_fail ("IsStack"
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.h"
, 77, __PRETTY_FUNCTION__));
  return StackOffset;
}

unsigned getMask() const {
  return Mask;
}

bool isMasked() const {
  return Mask != ~0u;
9
←
Assuming the condition is true→
10
←
Returning the value 1, which participates in a condition later→
}

void print(raw_ostream &OS, const TargetRegisterInfo *TRI = nullptr) const;
90};

92inline raw_ostream &operator<<(raw_ostream &OS, const ArgDescriptor &Arg) {
Arg.print(OS);
return OS;
95}

97struct AMDGPUFunctionArgInfo {
enum PreloadedValue {
  // SGPRS:
  PRIVATE_SEGMENT_BUFFER = 0,
  DISPATCH_PTR        =  1,
  QUEUE_PTR           =  2,
  KERNARG_SEGMENT_PTR =  3,
  DISPATCH_ID         =  4,
  FLAT_SCRATCH_INIT   =  5,
  WORKGROUP_ID_X      = 10,
  WORKGROUP_ID_Y      = 11,
  WORKGROUP_ID_Z      = 12,
  PRIVATE_SEGMENT_WAVE_BYTE_OFFSET = 14,
  IMPLICIT_BUFFER_PTR = 15,
  IMPLICIT_ARG_PTR = 16,

  // VGPRS:
  WORKITEM_ID_X       = 17,
  WORKITEM_ID_Y       = 18,
  WORKITEM_ID_Z       = 19,
  FIRST_VGPR_VALUE    = WORKITEM_ID_X
};

// Kernel input registers setup for the HSA ABI in allocation order.

// User SGPRs in kernels
// XXX - Can these require argument spills?
ArgDescriptor PrivateSegmentBuffer;
ArgDescriptor DispatchPtr;
ArgDescriptor QueuePtr;
ArgDescriptor KernargSegmentPtr;
ArgDescriptor DispatchID;
ArgDescriptor FlatScratchInit;
ArgDescriptor PrivateSegmentSize;

// System SGPRs in kernels.
ArgDescriptor WorkGroupIDX;
ArgDescriptor WorkGroupIDY;
ArgDescriptor WorkGroupIDZ;
ArgDescriptor WorkGroupInfo;
ArgDescriptor PrivateSegmentWaveByteOffset;

// Pointer with offset from kernargsegmentptr to where special ABI arguments
// are passed to callable functions.
ArgDescriptor ImplicitArgPtr;

// Input registers for non-HSA ABI
ArgDescriptor ImplicitBufferPtr;

// VGPRs inputs. These are always v0, v1 and v2 for entry functions.
ArgDescriptor WorkItemIDX;
ArgDescriptor WorkItemIDY;
ArgDescriptor WorkItemIDZ;

std::tuple<const ArgDescriptor *, const TargetRegisterClass *, LLT>
getPreloadedValue(PreloadedValue Value) const;

static constexpr AMDGPUFunctionArgInfo fixedABILayout();
155};

157class AMDGPUArgumentUsageInfo : public ImmutablePass {
158private:
DenseMap<const Function *, AMDGPUFunctionArgInfo> ArgInfoMap;

161public:
static char ID;

static const AMDGPUFunctionArgInfo ExternFunctionInfo;
static const AMDGPUFunctionArgInfo FixedABIFunctionInfo;

AMDGPUArgumentUsageInfo() : ImmutablePass(ID) { }

void getAnalysisUsage(AnalysisUsage &AU) const override {
  AU.setPreservesAll();
}

bool doInitialization(Module &M) override;
bool doFinalization(Module &M) override;

void print(raw_ostream &OS, const Module *M = nullptr) const override;

void setFuncArgInfo(const Function &F, const AMDGPUFunctionArgInfo &ArgInfo) {
  ArgInfoMap[&F] = ArgInfo;
}

const AMDGPUFunctionArgInfo &lookupFuncArgInfo(const Function &F) const;
183};

185} // end namespace llvm

187#endif

←

/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h

1//===-- llvm/Support/MathExtras.h - Useful math functions -------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file contains some functions that are useful for math stuff.
10//
11//===----------------------------------------------------------------------===//
12 
13#ifndef LLVM_SUPPORT_MATHEXTRAS_H
14#define LLVM_SUPPORT_MATHEXTRAS_H
15 
16#include "llvm/Support/Compiler.h"
17#include <algorithm>
18#include <cassert>
19#include <climits>
20#include <cmath>
21#include <cstdint>
22#include <cstring>
23#include <limits>
24#include <type_traits>
25 
26#ifdef __ANDROID_NDK__
27#include <android/api-level.h>
28#endif
29 
30#ifdef _MSC_VER
31// Declare these intrinsics manually rather including intrin.h. It's very
32// expensive, and MathExtras.h is popular.
33// #include <intrin.h>
34extern "C" {
35unsigned char _BitScanForward(unsigned long *_Index, unsigned long _Mask);
36unsigned char _BitScanForward64(unsigned long *_Index, unsigned __int64 _Mask);
37unsigned char _BitScanReverse(unsigned long *_Index, unsigned long _Mask);
38unsigned char _BitScanReverse64(unsigned long *_Index, unsigned __int64 _Mask);
39}
40#endif
41 
42namespace llvm {
43 
44/// The behavior an operation has on an input of 0.
45enum ZeroBehavior {
46  /// The returned value is undefined.
47  ZB_Undefined,
48  /// The returned value is numeric_limits<T>::max()
49  ZB_Max,
50  /// The returned value is numeric_limits<T>::digits
51  ZB_Width
52};
53 
54/// Mathematical constants.
55namespace numbers {
56// TODO: Track C++20 std::numbers.
57// TODO: Favor using the hexadecimal FP constants (requires C++17).
58constexpr double e          = 2.7182818284590452354, // (0x1.5bf0a8b145749P+1) https://oeis.org/A001113
59                 egamma     = .57721566490153286061, // (0x1.2788cfc6fb619P-1) https://oeis.org/A001620
60                 ln2        = .69314718055994530942, // (0x1.62e42fefa39efP-1) https://oeis.org/A002162
61                 ln10       = 2.3025850929940456840, // (0x1.24bb1bbb55516P+1) https://oeis.org/A002392
62                 log2e      = 1.4426950408889634074, // (0x1.71547652b82feP+0)
63                 log10e     = .43429448190325182765, // (0x1.bcb7b1526e50eP-2)
64                 pi         = 3.1415926535897932385, // (0x1.921fb54442d18P+1) https://oeis.org/A000796
65                 inv_pi     = .31830988618379067154, // (0x1.45f306bc9c883P-2) https://oeis.org/A049541
66                 sqrtpi     = 1.7724538509055160273, // (0x1.c5bf891b4ef6bP+0) https://oeis.org/A002161
67                 inv_sqrtpi = .56418958354775628695, // (0x1.20dd750429b6dP-1) https://oeis.org/A087197
68                 sqrt2      = 1.4142135623730950488, // (0x1.6a09e667f3bcdP+0) https://oeis.org/A00219
69                 inv_sqrt2  = .70710678118654752440, // (0x1.6a09e667f3bcdP-1)
70                 sqrt3      = 1.7320508075688772935, // (0x1.bb67ae8584caaP+0) https://oeis.org/A002194
71                 inv_sqrt3  = .57735026918962576451, // (0x1.279a74590331cP-1)
72                 phi        = 1.6180339887498948482; // (0x1.9e3779b97f4a8P+0) https://oeis.org/A001622
73constexpr float ef          = 2.71828183F, // (0x1.5bf0a8P+1) https://oeis.org/A001113
74                egammaf     = .577215665F, // (0x1.2788d0P-1) https://oeis.org/A001620
75                ln2f        = .693147181F, // (0x1.62e430P-1) https://oeis.org/A002162
76                ln10f       = 2.30258509F, // (0x1.26bb1cP+1) https://oeis.org/A002392
77                log2ef      = 1.44269504F, // (0x1.715476P+0)
78                log10ef     = .434294482F, // (0x1.bcb7b2P-2)
79                pif         = 3.14159265F, // (0x1.921fb6P+1) https://oeis.org/A000796
80                inv_pif     = .318309886F, // (0x1.45f306P-2) https://oeis.org/A049541
81                sqrtpif     = 1.77245385F, // (0x1.c5bf8aP+0) https://oeis.org/A002161
82                inv_sqrtpif = .564189584F, // (0x1.20dd76P-1) https://oeis.org/A087197
83                sqrt2f      = 1.41421356F, // (0x1.6a09e6P+0) https://oeis.org/A002193
84                inv_sqrt2f  = .707106781F, // (0x1.6a09e6P-1)
85                sqrt3f      = 1.73205081F, // (0x1.bb67aeP+0) https://oeis.org/A002194
86                inv_sqrt3f  = .577350269F, // (0x1.279a74P-1)
87                phif        = 1.61803399F; // (0x1.9e377aP+0) https://oeis.org/A001622
88} // namespace numbers
89 
90namespace detail {
91template <typename T, std::size_t SizeOfT> struct TrailingZerosCounter {
92  static unsigned count(T Val, ZeroBehavior) {
93    if (!Val)
94      return std::numeric_limits<T>::digits;
95    if (Val & 0x1)
96      return 0;
97 
98    // Bisection method.
99    unsigned ZeroBits = 0;
100    T Shift = std::numeric_limits<T>::digits >> 1;
101    T Mask = std::numeric_limits<T>::max() >> Shift;
102    while (Shift) {
103      if ((Val & Mask) == 0) {
104        Val >>= Shift;
105        ZeroBits |= Shift;
106      }
107      Shift >>= 1;
108      Mask >>= Shift;
109    }
110    return ZeroBits;
111  }
112};
113 
114#if defined(__GNUC__4) || defined(_MSC_VER)
115template <typename T> struct TrailingZerosCounter<T, 4> {
116  static unsigned count(T Val, ZeroBehavior ZB) {
117    if (ZB14.1
'ZB' is not equal to ZB_Undefined
14.1
'ZB' is not equal to ZB_Undefined
14.1
'ZB' is not equal to ZB_Undefined
 != ZB_Undefined && Val == 0)
15
←
Assuming 'Val' is equal to 0→
16
←
Taking true branch→
118      return 32;
17
←
Returning the value 32→
119 
120#if __has_builtin(__builtin_ctz)1 || defined(__GNUC__4)
121    return __builtin_ctz(Val);
122#elif defined(_MSC_VER)
123    unsigned long Index;
124    _BitScanForward(&Index, Val);
125    return Index;
126#endif
127  }
128};
129 
130#if !defined(_MSC_VER) || defined(_M_X64)
131template <typename T> struct TrailingZerosCounter<T, 8> {
132  static unsigned count(T Val, ZeroBehavior ZB) {
133    if (ZB != ZB_Undefined && Val == 0)
134      return 64;
135 
136#if __has_builtin(__builtin_ctzll)1 || defined(__GNUC__4)
137    return __builtin_ctzll(Val);
138#elif defined(_MSC_VER)
139    unsigned long Index;
140    _BitScanForward64(&Index, Val);
141    return Index;
142#endif
143  }
144};
145#endif
146#endif
147} // namespace detail
148 
149/// Count number of 0's from the least significant bit to the most
150///   stopping at the first 1.
151///
152/// Only unsigned integral types are allowed.
153///
154/// \param ZB the behavior on an input of 0. Only ZB_Width and ZB_Undefined are
155///   valid arguments.
156template <typename T>
157unsigned countTrailingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
158  static_assert(std::numeric_limits<T>::is_integer &&
159                    !std::numeric_limits<T>::is_signed,
160                "Only unsigned integral types are allowed.");
161  return llvm::detail::TrailingZerosCounter<T, sizeof(T)>::count(Val, ZB);
14
←
Calling 'TrailingZerosCounter::count'→
18
←
Returning from 'TrailingZerosCounter::count'→
19
←
Returning the value 32→
162}
163 
164namespace detail {
165template <typename T, std::size_t SizeOfT> struct LeadingZerosCounter {
166  static unsigned count(T Val, ZeroBehavior) {
167    if (!Val)
168      return std::numeric_limits<T>::digits;
169 
170    // Bisection method.
171    unsigned ZeroBits = 0;
172    for (T Shift = std::numeric_limits<T>::digits >> 1; Shift; Shift >>= 1) {
173      T Tmp = Val >> Shift;
174      if (Tmp)
175        Val = Tmp;
176      else
177        ZeroBits |= Shift;
178    }
179    return ZeroBits;
180  }
181};
182 
183#if defined(__GNUC__4) || defined(_MSC_VER)
184template <typename T> struct LeadingZerosCounter<T, 4> {
185  static unsigned count(T Val, ZeroBehavior ZB) {
186    if (ZB != ZB_Undefined && Val == 0)
187      return 32;
188 
189#if __has_builtin(__builtin_clz)1 || defined(__GNUC__4)
190    return __builtin_clz(Val);
191#elif defined(_MSC_VER)
192    unsigned long Index;
193    _BitScanReverse(&Index, Val);
194    return Index ^ 31;
195#endif
196  }
197};
198 
199#if !defined(_MSC_VER) || defined(_M_X64)
200template <typename T> struct LeadingZerosCounter<T, 8> {
201  static unsigned count(T Val, ZeroBehavior ZB) {
202    if (ZB != ZB_Undefined && Val == 0)
203      return 64;
204 
205#if __has_builtin(__builtin_clzll)1 || defined(__GNUC__4)
206    return __builtin_clzll(Val);
207#elif defined(_MSC_VER)
208    unsigned long Index;
209    _BitScanReverse64(&Index, Val);
210    return Index ^ 63;
211#endif
212  }
213};
214#endif
215#endif
216} // namespace detail
217 
218/// Count number of 0's from the most significant bit to the least
219///   stopping at the first 1.
220///
221/// Only unsigned integral types are allowed.
222///
223/// \param ZB the behavior on an input of 0. Only ZB_Width and ZB_Undefined are
224///   valid arguments.
225template <typename T>
226unsigned countLeadingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
227  static_assert(std::numeric_limits<T>::is_integer &&
228                    !std::numeric_limits<T>::is_signed,
229                "Only unsigned integral types are allowed.");
230  return llvm::detail::LeadingZerosCounter<T, sizeof(T)>::count(Val, ZB);
231}
232 
233/// Get the index of the first set bit starting from the least
234///   significant bit.
235///
236/// Only unsigned integral types are allowed.
237///
238/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
239///   valid arguments.
240template <typename T> T findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) {
241  if (ZB == ZB_Max && Val == 0)
242    return std::numeric_limits<T>::max();
243 
244  return countTrailingZeros(Val, ZB_Undefined);
245}
246 
247/// Create a bitmask with the N right-most bits set to 1, and all other
248/// bits set to 0.  Only unsigned types are allowed.
249template <typename T> T maskTrailingOnes(unsigned N) {
250  static_assert(std::is_unsigned<T>::value, "Invalid type!");
251  const unsigned Bits = CHAR_BIT8 * sizeof(T);
252  assert(N <= Bits && "Invalid bit index")((N <= Bits && "Invalid bit index") ? static_cast<
void> (0) : __assert_fail ("N <= Bits && \"Invalid bit index\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h"
, 252, __PRETTY_FUNCTION__));
253  return N == 0 ? 0 : (T(-1) >> (Bits - N));
254}
255 
256/// Create a bitmask with the N left-most bits set to 1, and all other
257/// bits set to 0.  Only unsigned types are allowed.
258template <typename T> T maskLeadingOnes(unsigned N) {
259  return ~maskTrailingOnes<T>(CHAR_BIT8 * sizeof(T) - N);
260}
261 
262/// Create a bitmask with the N right-most bits set to 0, and all other
263/// bits set to 1.  Only unsigned types are allowed.
264template <typename T> T maskTrailingZeros(unsigned N) {
265  return maskLeadingOnes<T>(CHAR_BIT8 * sizeof(T) - N);
266}
267 
268/// Create a bitmask with the N left-most bits set to 0, and all other
269/// bits set to 1.  Only unsigned types are allowed.
270template <typename T> T maskLeadingZeros(unsigned N) {
271  return maskTrailingOnes<T>(CHAR_BIT8 * sizeof(T) - N);
272}
273 
274/// Get the index of the last set bit starting from the least
275///   significant bit.
276///
277/// Only unsigned integral types are allowed.
278///
279/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
280///   valid arguments.
281template <typename T> T findLastSet(T Val, ZeroBehavior ZB = ZB_Max) {
282  if (ZB == ZB_Max && Val == 0)
283    return std::numeric_limits<T>::max();
284 
285  // Use ^ instead of - because both gcc and llvm can remove the associated ^
286  // in the __builtin_clz intrinsic on x86.
287  return countLeadingZeros(Val, ZB_Undefined) ^
288         (std::numeric_limits<T>::digits - 1);
289}
290 
291/// Macro compressed bit reversal table for 256 bits.
292///
293/// http://graphics.stanford.edu/~seander/bithacks.html#BitReverseTable
294static const unsigned char BitReverseTable256[256] = {
295#define R2(n) n, n + 2 * 64, n + 1 * 64, n + 3 * 64
296#define R4(n) R2(n), R2(n + 2 * 16), R2(n + 1 * 16), R2(n + 3 * 16)
297#define R6(n) R4(n), R4(n + 2 * 4), R4(n + 1 * 4), R4(n + 3 * 4)
298  R6(0), R6(2), R6(1), R6(3)
299#undef R2
300#undef R4
301#undef R6
302};
303 
304/// Reverse the bits in \p Val.
305template <typename T>
306T reverseBits(T Val) {
307  unsigned char in[sizeof(Val)];
308  unsigned char out[sizeof(Val)];
309  std::memcpy(in, &Val, sizeof(Val));
310  for (unsigned i = 0; i < sizeof(Val); ++i)
311    out[(sizeof(Val) - i) - 1] = BitReverseTable256[in[i]];
312  std::memcpy(&Val, out, sizeof(Val));
313  return Val;
314}
315 
316#if __has_builtin(__builtin_bitreverse8)1
317template<>
318inline uint8_t reverseBits<uint8_t>(uint8_t Val) {
319  return __builtin_bitreverse8(Val);
320}
321#endif
322 
323#if __has_builtin(__builtin_bitreverse16)1
324template<>
325inline uint16_t reverseBits<uint16_t>(uint16_t Val) {
326  return __builtin_bitreverse16(Val);
327}
328#endif
329 
330#if __has_builtin(__builtin_bitreverse32)1
331template<>
332inline uint32_t reverseBits<uint32_t>(uint32_t Val) {
333  return __builtin_bitreverse32(Val);
334}
335#endif
336 
337#if __has_builtin(__builtin_bitreverse64)1
338template<>
339inline uint64_t reverseBits<uint64_t>(uint64_t Val) {
340  return __builtin_bitreverse64(Val);
341}
342#endif
343 
344// NOTE: The following support functions use the _32/_64 extensions instead of
345// type overloading so that signed and unsigned integers can be used without
346// ambiguity.
347 
348/// Return the high 32 bits of a 64 bit value.
349constexpr inline uint32_t Hi_32(uint64_t Value) {
350  return static_cast<uint32_t>(Value >> 32);
351}
352 
353/// Return the low 32 bits of a 64 bit value.
354constexpr inline uint32_t Lo_32(uint64_t Value) {
355  return static_cast<uint32_t>(Value);
356}
357 
358/// Make a 64-bit integer from a high / low pair of 32-bit integers.
359constexpr inline uint64_t Make_64(uint32_t High, uint32_t Low) {
360  return ((uint64_t)High << 32) | (uint64_t)Low;
361}
362 
363/// Checks if an integer fits into the given bit width.
364template <unsigned N> constexpr inline bool isInt(int64_t x) {
365  return N >= 64 || (-(INT64_C(1)1L<<(N-1)) <= x && x < (INT64_C(1)1L<<(N-1)));
366}
367// Template specializations to get better code for common cases.
368template <> constexpr inline bool isInt<8>(int64_t x) {
369  return static_cast<int8_t>(x) == x;
370}
371template <> constexpr inline bool isInt<16>(int64_t x) {
372  return static_cast<int16_t>(x) == x;
373}
374template <> constexpr inline bool isInt<32>(int64_t x) {
375  return static_cast<int32_t>(x) == x;
376}
377 
378/// Checks if a signed integer is an N bit number shifted left by S.
379template <unsigned N, unsigned S>
380constexpr inline bool isShiftedInt(int64_t x) {
381  static_assert(
382      N > 0, "isShiftedInt<0> doesn't make sense (refers to a 0-bit number.");
383  static_assert(N + S <= 64, "isShiftedInt<N, S> with N + S > 64 is too wide.");
384  return isInt<N + S>(x) && (x % (UINT64_C(1)1UL << S) == 0);
385}
386 
387/// Checks if an unsigned integer fits into the given bit width.
388///
389/// This is written as two functions rather than as simply
390///
391///   return N >= 64 || X < (UINT64_C(1) << N);
392///
393/// to keep MSVC from (incorrectly) warning on isUInt<64> that we're shifting
394/// left too many places.
395template <unsigned N>
396constexpr inline std::enable_if_t<(N < 64), bool> isUInt(uint64_t X) {
397  static_assert(N > 0, "isUInt<0> doesn't make sense");
398  return X < (UINT64_C(1)1UL << (N));
399}
400template <unsigned N>
401constexpr inline std::enable_if_t<N >= 64, bool> isUInt(uint64_t X) {
402  return true;
403}
404 
405// Template specializations to get better code for common cases.
406template <> constexpr inline bool isUInt<8>(uint64_t x) {
407  return static_cast<uint8_t>(x) == x;
408}
409template <> constexpr inline bool isUInt<16>(uint64_t x) {
410  return static_cast<uint16_t>(x) == x;
411}
412template <> constexpr inline bool isUInt<32>(uint64_t x) {
413  return static_cast<uint32_t>(x) == x;
414}
415 
416/// Checks if a unsigned integer is an N bit number shifted left by S.
417template <unsigned N, unsigned S>
418constexpr inline bool isShiftedUInt(uint64_t x) {
419  static_assert(
420      N > 0, "isShiftedUInt<0> doesn't make sense (refers to a 0-bit number)");
421  static_assert(N + S <= 64,
422                "isShiftedUInt<N, S> with N + S > 64 is too wide.");
423  // Per the two static_asserts above, S must be strictly less than 64.  So
424  // 1 << S is not undefined behavior.
425  return isUInt<N + S>(x) && (x % (UINT64_C(1)1UL << S) == 0);
426}
427 
428/// Gets the maximum value for a N-bit unsigned integer.
429inline uint64_t maxUIntN(uint64_t N) {
430  assert(N > 0 && N <= 64 && "integer width out of range")((N > 0 && N <= 64 && "integer width out of range"
) ? static_cast<void> (0) : __assert_fail ("N > 0 && N <= 64 && \"integer width out of range\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h"
, 430, __PRETTY_FUNCTION__));
431 
432  // uint64_t(1) << 64 is undefined behavior, so we can't do
433  //   (uint64_t(1) << N) - 1
434  // without checking first that N != 64.  But this works and doesn't have a
435  // branch.
436  return UINT64_MAX(18446744073709551615UL) >> (64 - N);
437}
438 
439/// Gets the minimum value for a N-bit signed integer.
440inline int64_t minIntN(int64_t N) {
441  assert(N > 0 && N <= 64 && "integer width out of range")((N > 0 && N <= 64 && "integer width out of range"
) ? static_cast<void> (0) : __assert_fail ("N > 0 && N <= 64 && \"integer width out of range\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h"
, 441, __PRETTY_FUNCTION__));
442 
443  return UINT64_C(1)1UL + ~(UINT64_C(1)1UL << (N - 1));
444}
445 
446/// Gets the maximum value for a N-bit signed integer.
447inline int64_t maxIntN(int64_t N) {
448  assert(N > 0 && N <= 64 && "integer width out of range")((N > 0 && N <= 64 && "integer width out of range"
) ? static_cast<void> (0) : __assert_fail ("N > 0 && N <= 64 && \"integer width out of range\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h"
, 448, __PRETTY_FUNCTION__));
449 
450  // This relies on two's complement wraparound when N == 64, so we convert to
451  // int64_t only at the very end to avoid UB.
452  return (UINT64_C(1)1UL << (N - 1)) - 1;
453}
454 
455/// Checks if an unsigned integer fits into the given (dynamic) bit width.
456inline bool isUIntN(unsigned N, uint64_t x) {
457  return N >= 64 || x <= maxUIntN(N);
458}
459 
460/// Checks if an signed integer fits into the given (dynamic) bit width.
461inline bool isIntN(unsigned N, int64_t x) {
462  return N >= 64 || (minIntN(N) <= x && x <= maxIntN(N));
463}
464 
465/// Return true if the argument is a non-empty sequence of ones starting at the
466/// least significant bit with the remainder zero (32 bit version).
467/// Ex. isMask_32(0x0000FFFFU) == true.
468constexpr inline bool isMask_32(uint32_t Value) {
469  return Value && ((Value + 1) & Value) == 0;
470}
471 
472/// Return true if the argument is a non-empty sequence of ones starting at the
473/// least significant bit with the remainder zero (64 bit version).
474constexpr inline bool isMask_64(uint64_t Value) {
475  return Value && ((Value + 1) & Value) == 0;
476}
477 
478/// Return true if the argument contains a non-empty sequence of ones with the
479/// remainder zero (32 bit version.) Ex. isShiftedMask_32(0x0000FF00U) == true.
480constexpr inline bool isShiftedMask_32(uint32_t Value) {
481  return Value && isMask_32((Value - 1) | Value);
482}
483 
484/// Return true if the argument contains a non-empty sequence of ones with the
485/// remainder zero (64 bit version.)
486constexpr inline bool isShiftedMask_64(uint64_t Value) {
487  return Value && isMask_64((Value - 1) | Value);
488}
489 
490/// Return true if the argument is a power of two > 0.
491/// Ex. isPowerOf2_32(0x00100000U) == true (32 bit edition.)
492constexpr inline bool isPowerOf2_32(uint32_t Value) {
493  return Value && !(Value & (Value - 1));
494}
495 
496/// Return true if the argument is a power of two > 0 (64 bit edition.)
497constexpr inline bool isPowerOf2_64(uint64_t Value) {
498  return Value && !(Value & (Value - 1));
499}
500 
501/// Count the number of ones from the most significant bit to the first
502/// zero bit.
503///
504/// Ex. countLeadingOnes(0xFF0FFF00) == 8.
505/// Only unsigned integral types are allowed.
506///
507/// \param ZB the behavior on an input of all ones. Only ZB_Width and
508/// ZB_Undefined are valid arguments.
509template <typename T>
510unsigned countLeadingOnes(T Value, ZeroBehavior ZB = ZB_Width) {
511  static_assert(std::numeric_limits<T>::is_integer &&
512                    !std::numeric_limits<T>::is_signed,
513                "Only unsigned integral types are allowed.");
514  return countLeadingZeros<T>(~Value, ZB);
515}
516 
517/// Count the number of ones from the least significant bit to the first
518/// zero bit.
519///
520/// Ex. countTrailingOnes(0x00FF00FF) == 8.
521/// Only unsigned integral types are allowed.
522///
523/// \param ZB the behavior on an input of all ones. Only ZB_Width and
524/// ZB_Undefined are valid arguments.
525template <typename T>
526unsigned countTrailingOnes(T Value, ZeroBehavior ZB = ZB_Width) {
527  static_assert(std::numeric_limits<T>::is_integer &&
528                    !std::numeric_limits<T>::is_signed,
529                "Only unsigned integral types are allowed.");
530  return countTrailingZeros<T>(~Value, ZB);
531}
532 
533namespace detail {
534template <typename T, std::size_t SizeOfT> struct PopulationCounter {
535  static unsigned count(T Value) {
536    // Generic version, forward to 32 bits.
537    static_assert(SizeOfT <= 4, "Not implemented!");
538#if defined(__GNUC__4)
539    return __builtin_popcount(Value);
540#else
541    uint32_t v = Value;
542    v = v - ((v >> 1) & 0x55555555);
543    v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
544    return ((v + (v >> 4) & 0xF0F0F0F) * 0x1010101) >> 24;
545#endif
546  }
547};
548 
549template <typename T> struct PopulationCounter<T, 8> {
550  static unsigned count(T Value) {
551#if defined(__GNUC__4)
552    return __builtin_popcountll(Value);
553#else
554    uint64_t v = Value;
555    v = v - ((v >> 1) & 0x5555555555555555ULL);
556    v = (v & 0x3333333333333333ULL) + ((v >> 2) & 0x3333333333333333ULL);
557    v = (v + (v >> 4)) & 0x0F0F0F0F0F0F0F0FULL;
558    return unsigned((uint64_t)(v * 0x0101010101010101ULL) >> 56);
559#endif
560  }
561};
562} // namespace detail
563 
564/// Count the number of set bits in a value.
565/// Ex. countPopulation(0xF000F000) = 8
566/// Returns 0 if the word is zero.
567template <typename T>
568inline unsigned countPopulation(T Value) {
569  static_assert(std::numeric_limits<T>::is_integer &&
570                    !std::numeric_limits<T>::is_signed,
571                "Only unsigned integral types are allowed.");
572  return detail::PopulationCounter<T, sizeof(T)>::count(Value);
573}
574 
575/// Compile time Log2.
576/// Valid only for positive powers of two.
577template <size_t kValue> constexpr inline size_t CTLog2() {
578  static_assert(kValue > 0 && llvm::isPowerOf2_64(kValue),
579                "Value is not a valid power of 2");
580  return 1 + CTLog2<kValue / 2>();
581}
582 
583template <> constexpr inline size_t CTLog2<1>() { return 0; }
584 
585/// Return the log base 2 of the specified value.
586inline double Log2(double Value) {
587#if defined(__ANDROID_API__) && __ANDROID_API__ < 18
588  return __builtin_log(Value) / __builtin_log(2.0);
589#else
590  return log2(Value);
591#endif
592}
593 
594/// Return the floor log base 2 of the specified value, -1 if the value is zero.
595/// (32 bit edition.)
596/// Ex. Log2_32(32) == 5, Log2_32(1) == 0, Log2_32(0) == -1, Log2_32(6) == 2
597inline unsigned Log2_32(uint32_t Value) {
598  return 31 - countLeadingZeros(Value);
599}
600 
601/// Return the floor log base 2 of the specified value, -1 if the value is zero.
602/// (64 bit edition.)
603inline unsigned Log2_64(uint64_t Value) {
604  return 63 - countLeadingZeros(Value);
605}
606 
607/// Return the ceil log base 2 of the specified value, 32 if the value is zero.
608/// (32 bit edition).
609/// Ex. Log2_32_Ceil(32) == 5, Log2_32_Ceil(1) == 0, Log2_32_Ceil(6) == 3
610inline unsigned Log2_32_Ceil(uint32_t Value) {
611  return 32 - countLeadingZeros(Value - 1);
612}
613 
614/// Return the ceil log base 2 of the specified value, 64 if the value is zero.
615/// (64 bit edition.)
616inline unsigned Log2_64_Ceil(uint64_t Value) {
617  return 64 - countLeadingZeros(Value - 1);
618}
619 
620/// Return the greatest common divisor of the values using Euclid's algorithm.
621template <typename T>
622inline T greatestCommonDivisor(T A, T B) {
623  while (B) {
624    T Tmp = B;
625    B = A % B;
626    A = Tmp;
627  }
628  return A;
629}
630 
631inline uint64_t GreatestCommonDivisor64(uint64_t A, uint64_t B) {
632  return greatestCommonDivisor<uint64_t>(A, B);
633}
634 
635/// This function takes a 64-bit integer and returns the bit equivalent double.
636inline double BitsToDouble(uint64_t Bits) {
637  double D;
638  static_assert(sizeof(uint64_t) == sizeof(double), "Unexpected type sizes");
639  memcpy(&D, &Bits, sizeof(Bits));
640  return D;
641}
642 
643/// This function takes a 32-bit integer and returns the bit equivalent float.
644inline float BitsToFloat(uint32_t Bits) {
645  float F;
646  static_assert(sizeof(uint32_t) == sizeof(float), "Unexpected type sizes");
647  memcpy(&F, &Bits, sizeof(Bits));
648  return F;
649}
650 
651/// This function takes a double and returns the bit equivalent 64-bit integer.
652/// Note that copying doubles around changes the bits of NaNs on some hosts,
653/// notably x86, so this routine cannot be used if these bits are needed.
654inline uint64_t DoubleToBits(double Double) {
655  uint64_t Bits;
656  static_assert(sizeof(uint64_t) == sizeof(double), "Unexpected type sizes");
657  memcpy(&Bits, &Double, sizeof(Double));
658  return Bits;
659}
660 
661/// This function takes a float and returns the bit equivalent 32-bit integer.
662/// Note that copying floats around changes the bits of NaNs on some hosts,
663/// notably x86, so this routine cannot be used if these bits are needed.
664inline uint32_t FloatToBits(float Float) {
665  uint32_t Bits;
666  static_assert(sizeof(uint32_t) == sizeof(float), "Unexpected type sizes");
667  memcpy(&Bits, &Float, sizeof(Float));
668  return Bits;
669}
670 
671/// A and B are either alignments or offsets. Return the minimum alignment that
672/// may be assumed after adding the two together.
673constexpr inline uint64_t MinAlign(uint64_t A, uint64_t B) {
674  // The largest power of 2 that divides both A and B.
675  //
676  // Replace "-Value" by "1+~Value" in the following commented code to avoid
677  // MSVC warning C4146
678  //    return (A | B) & -(A | B);
679  return (A | B) & (1 + ~(A | B));
680}
681 
682/// Returns the next power of two (in 64-bits) that is strictly greater than A.
683/// Returns zero on overflow.
684inline uint64_t NextPowerOf2(uint64_t A) {
685  A |= (A >> 1);
686  A |= (A >> 2);
687  A |= (A >> 4);
688  A |= (A >> 8);
689  A |= (A >> 16);
690  A |= (A >> 32);
691  return A + 1;
692}
693 
694/// Returns the power of two which is less than or equal to the given value.
695/// Essentially, it is a floor operation across the domain of powers of two.
696inline uint64_t PowerOf2Floor(uint64_t A) {
697  if (!A) return 0;
698  return 1ull << (63 - countLeadingZeros(A, ZB_Undefined));
699}
700 
701/// Returns the power of two which is greater than or equal to the given value.
702/// Essentially, it is a ceil operation across the domain of powers of two.
703inline uint64_t PowerOf2Ceil(uint64_t A) {
704  if (!A)
705    return 0;
706  return NextPowerOf2(A - 1);
707}
708 
709/// Returns the next integer (mod 2**64) that is greater than or equal to
710/// \p Value and is a multiple of \p Align. \p Align must be non-zero.
711///
712/// If non-zero \p Skew is specified, the return value will be a minimal
713/// integer that is greater than or equal to \p Value and equal to
714/// \p Align * N + \p Skew for some integer N. If \p Skew is larger than
715/// \p Align, its value is adjusted to '\p Skew mod \p Align'.
716///
717/// Examples:
718/// \code
719///   alignTo(5, 8) = 8
720///   alignTo(17, 8) = 24
721///   alignTo(~0LL, 8) = 0
722///   alignTo(321, 255) = 510
723///
724///   alignTo(5, 8, 7) = 7
725///   alignTo(17, 8, 1) = 17
726///   alignTo(~0LL, 8, 3) = 3
727///   alignTo(321, 255, 42) = 552
728/// \endcode
729inline uint64_t alignTo(uint64_t Value, uint64_t Align, uint64_t Skew = 0) {
730  assert(Align != 0u && "Align can't be 0.")((Align != 0u && "Align can't be 0.") ? static_cast<
void> (0) : __assert_fail ("Align != 0u && \"Align can't be 0.\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h"
, 730, __PRETTY_FUNCTION__));
731  Skew %= Align;
732  return (Value + Align - 1 - Skew) / Align * Align + Skew;
733}
734 
735/// Returns the next integer (mod 2**64) that is greater than or equal to
736/// \p Value and is a multiple of \c Align. \c Align must be non-zero.
737template <uint64_t Align> constexpr inline uint64_t alignTo(uint64_t Value) {
738  static_assert(Align != 0u, "Align must be non-zero");
739  return (Value + Align - 1) / Align * Align;
740}
741 
742/// Returns the integer ceil(Numerator / Denominator).
743inline uint64_t divideCeil(uint64_t Numerator, uint64_t Denominator) {
744  return alignTo(Numerator, Denominator) / Denominator;
745}
746 
747/// Returns the integer nearest(Numerator / Denominator).
748inline uint64_t divideNearest(uint64_t Numerator, uint64_t Denominator) {
749  return (Numerator + (Denominator / 2)) / Denominator;
750}
751 
752/// Returns the largest uint64_t less than or equal to \p Value and is
753/// \p Skew mod \p Align. \p Align must be non-zero
754inline uint64_t alignDown(uint64_t Value, uint64_t Align, uint64_t Skew = 0) {
755  assert(Align != 0u && "Align can't be 0.")((Align != 0u && "Align can't be 0.") ? static_cast<
void> (0) : __assert_fail ("Align != 0u && \"Align can't be 0.\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h"
, 755, __PRETTY_FUNCTION__));
756  Skew %= Align;
757  return (Value - Skew) / Align * Align + Skew;
758}
759 
760/// Sign-extend the number in the bottom B bits of X to a 32-bit integer.
761/// Requires 0 < B <= 32.
762template <unsigned B> constexpr inline int32_t SignExtend32(uint32_t X) {
763  static_assert(B > 0, "Bit width can't be 0.");
764  static_assert(B <= 32, "Bit width out of range.");
765  return int32_t(X << (32 - B)) >> (32 - B);
766}
767 
768/// Sign-extend the number in the bottom B bits of X to a 32-bit integer.
769/// Requires 0 < B < 32.
770inline int32_t SignExtend32(uint32_t X, unsigned B) {
771  assert(B > 0 && "Bit width can't be 0.")((B > 0 && "Bit width can't be 0.") ? static_cast<
void> (0) : __assert_fail ("B > 0 && \"Bit width can't be 0.\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h"
, 771, __PRETTY_FUNCTION__));
772  assert(B <= 32 && "Bit width out of range.")((B <= 32 && "Bit width out of range.") ? static_cast
<void> (0) : __assert_fail ("B <= 32 && \"Bit width out of range.\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h"
, 772, __PRETTY_FUNCTION__));
773  return int32_t(X << (32 - B)) >> (32 - B);
774}
775 
776/// Sign-extend the number in the bottom B bits of X to a 64-bit integer.
777/// Requires 0 < B < 64.
778template <unsigned B> constexpr inline int64_t SignExtend64(uint64_t x) {
779  static_assert(B > 0, "Bit width can't be 0.");
780  static_assert(B <= 64, "Bit width out of range.");
781  return int64_t(x << (64 - B)) >> (64 - B);
782}
783 
784/// Sign-extend the number in the bottom B bits of X to a 64-bit integer.
785/// Requires 0 < B < 64.
786inline int64_t SignExtend64(uint64_t X, unsigned B) {
787  assert(B > 0 && "Bit width can't be 0.")((B > 0 && "Bit width can't be 0.") ? static_cast<
void> (0) : __assert_fail ("B > 0 && \"Bit width can't be 0.\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h"
, 787, __PRETTY_FUNCTION__));
788  assert(B <= 64 && "Bit width out of range.")((B <= 64 && "Bit width out of range.") ? static_cast
<void> (0) : __assert_fail ("B <= 64 && \"Bit width out of range.\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/include/llvm/Support/MathExtras.h"
, 788, __PRETTY_FUNCTION__));
789  return int64_t(X << (64 - B)) >> (64 - B);
790}
791 
792/// Subtract two unsigned integers, X and Y, of type T and return the absolute
793/// value of the result.
794template <typename T>
795std::enable_if_t<std::is_unsigned<T>::value, T> AbsoluteDifference(T X, T Y) {
796  return std::max(X, Y) - std::min(X, Y);
797}
798 
799/// Add two unsigned integers, X and Y, of type T.  Clamp the result to the
800/// maximum representable value of T on overflow.  ResultOverflowed indicates if
801/// the result is larger than the maximum representable value of type T.
802template <typename T>
803std::enable_if_t<std::is_unsigned<T>::value, T>
804SaturatingAdd(T X, T Y, bool *ResultOverflowed = nullptr) {
805  bool Dummy;
806  bool &Overflowed = ResultOverflowed ? *ResultOverflowed : Dummy;
807  // Hacker's Delight, p. 29
808  T Z = X + Y;
809  Overflowed = (Z < X || Z < Y);
810  if (Overflowed)
811    return std::numeric_limits<T>::max();
812  else
813    return Z;
814}
815 
816/// Multiply two unsigned integers, X and Y, of type T.  Clamp the result to the
817/// maximum representable value of T on overflow.  ResultOverflowed indicates if
818/// the result is larger than the maximum representable value of type T.
819template <typename T>
820std::enable_if_t<std::is_unsigned<T>::value, T>
821SaturatingMultiply(T X, T Y, bool *ResultOverflowed = nullptr) {
822  bool Dummy;
823  bool &Overflowed = ResultOverflowed ? *ResultOverflowed : Dummy;
824 
825  // Hacker's Delight, p. 30 has a different algorithm, but we don't use that
826  // because it fails for uint16_t (where multiplication can have undefined
827  // behavior due to promotion to int), and requires a division in addition
828  // to the multiplication.
829 
830  Overflowed = false;
831 
832  // Log2(Z) would be either Log2Z or Log2Z + 1.
833  // Special case: if X or Y is 0, Log2_64 gives -1, and Log2Z
834  // will necessarily be less than Log2Max as desired.
835  int Log2Z = Log2_64(X) + Log2_64(Y);
836  const T Max = std::numeric_limits<T>::max();
837  int Log2Max = Log2_64(Max);
838  if (Log2Z < Log2Max) {
839    return X * Y;
840  }
841  if (Log2Z > Log2Max) {
842    Overflowed = true;
843    return Max;
844  }
845 
846  // We're going to use the top bit, and maybe overflow one
847  // bit past it. Multiply all but the bottom bit then add
848  // that on at the end.
849  T Z = (X >> 1) * Y;
850  if (Z & ~(Max >> 1)) {
851    Overflowed = true;
852    return Max;
853  }
854  Z <<= 1;
855  if (X & 1)
856    return SaturatingAdd(Z, Y, ResultOverflowed);
857 
858  return Z;
859}
860 
861/// Multiply two unsigned integers, X and Y, and add the unsigned integer, A to
862/// the product. Clamp the result to the maximum representable value of T on
863/// overflow. ResultOverflowed indicates if the result is larger than the
864/// maximum representable value of type T.
865template <typename T>
866std::enable_if_t<std::is_unsigned<T>::value, T>
867SaturatingMultiplyAdd(T X, T Y, T A, bool *ResultOverflowed = nullptr) {
868  bool Dummy;
869  bool &Overflowed = ResultOverflowed ? *ResultOverflowed : Dummy;
870 
871  T Product = SaturatingMultiply(X, Y, &Overflowed);
872  if (Overflowed)
873    return Product;
874 
875  return SaturatingAdd(A, Product, &Overflowed);
876}
877 
878/// Use this rather than HUGE_VALF; the latter causes warnings on MSVC.
879extern const float huge_valf;
880 
881 
882/// Add two signed integers, computing the two's complement truncated result,
883/// returning true if overflow occured.
884template <typename T>
885std::enable_if_t<std::is_signed<T>::value, T> AddOverflow(T X, T Y, T &Result) {
886#if __has_builtin(__builtin_add_overflow)1
887  return __builtin_add_overflow(X, Y, &Result);
888#else
889  // Perform the unsigned addition.
890  using U = std::make_unsigned_t<T>;
891  const U UX = static_cast<U>(X);
892  const U UY = static_cast<U>(Y);
893  const U UResult = UX + UY;
894 
895  // Convert to signed.
896  Result = static_cast<T>(UResult);
897 
898  // Adding two positive numbers should result in a positive number.
899  if (X > 0 && Y > 0)
900    return Result <= 0;
901  // Adding two negatives should result in a negative number.
902  if (X < 0 && Y < 0)
903    return Result >= 0;
904  return false;
905#endif
906}
907 
908/// Subtract two signed integers, computing the two's complement truncated
909/// result, returning true if an overflow ocurred.
910template <typename T>
911std::enable_if_t<std::is_signed<T>::value, T> SubOverflow(T X, T Y, T &Result) {
912#if __has_builtin(__builtin_sub_overflow)1
913  return __builtin_sub_overflow(X, Y, &Result);
914#else
915  // Perform the unsigned addition.
916  using U = std::make_unsigned_t<T>;
917  const U UX = static_cast<U>(X);
918  const U UY = static_cast<U>(Y);
919  const U UResult = UX - UY;
920 
921  // Convert to signed.
922  Result = static_cast<T>(UResult);
923 
924  // Subtracting a positive number from a negative results in a negative number.
925  if (X <= 0 && Y > 0)
926    return Result >= 0;
927  // Subtracting a negative number from a positive results in a positive number.
928  if (X >= 0 && Y < 0)
929    return Result <= 0;
930  return false;
931#endif
932}
933 
934/// Multiply two signed integers, computing the two's complement truncated
935/// result, returning true if an overflow ocurred.
936template <typename T>
937std::enable_if_t<std::is_signed<T>::value, T> MulOverflow(T X, T Y, T &Result) {
938  // Perform the unsigned multiplication on absolute values.
939  using U = std::make_unsigned_t<T>;
940  const U UX = X < 0 ? (0 - static_cast<U>(X)) : static_cast<U>(X);
941  const U UY = Y < 0 ? (0 - static_cast<U>(Y)) : static_cast<U>(Y);
942  const U UResult = UX * UY;
943 
944  // Convert to signed.
945  const bool IsNegative = (X < 0) ^ (Y < 0);
946  Result = IsNegative ? (0 - UResult) : UResult;
947 
948  // If any of the args was 0, result is 0 and no overflow occurs.
949  if (UX == 0 || UY == 0)
950    return false;
951 
952  // UX and UY are in [1, 2^n], where n is the number of digits.
953  // Check how the max allowed absolute value (2^n for negative, 2^(n-1) for
954  // positive) divided by an argument compares to the other.
955  if (IsNegative)
956    return UX > (static_cast<U>(std::numeric_limits<T>::max()) + U(1)) / UY;
957  else
958    return UX > (static_cast<U>(std::numeric_limits<T>::max())) / UY;
959}
960 
961} // End llvm namespace
962 
963#endif