LLVM  10.0.0svn
MipsCCState.cpp
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1 //===---- MipsCCState.cpp - CCState with Mips specific extensions ---------===//
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 #include "MipsCCState.h"
10 #include "MipsSubtarget.h"
11 #include "llvm/IR/Module.h"
12 
13 using namespace llvm;
14 
15 /// This function returns true if CallSym is a long double emulation routine.
16 static bool isF128SoftLibCall(const char *CallSym) {
17  const char *const LibCalls[] = {
18  "__addtf3", "__divtf3", "__eqtf2", "__extenddftf2",
19  "__extendsftf2", "__fixtfdi", "__fixtfsi", "__fixtfti",
20  "__fixunstfdi", "__fixunstfsi", "__fixunstfti", "__floatditf",
21  "__floatsitf", "__floattitf", "__floatunditf", "__floatunsitf",
22  "__floatuntitf", "__getf2", "__gttf2", "__letf2",
23  "__lttf2", "__multf3", "__netf2", "__powitf2",
24  "__subtf3", "__trunctfdf2", "__trunctfsf2", "__unordtf2",
25  "ceill", "copysignl", "cosl", "exp2l",
26  "expl", "floorl", "fmal", "fmaxl",
27  "fmodl", "log10l", "log2l", "logl",
28  "nearbyintl", "powl", "rintl", "roundl",
29  "sinl", "sqrtl", "truncl"};
30 
31  // Check that LibCalls is sorted alphabetically.
32  auto Comp = [](const char *S1, const char *S2) { return strcmp(S1, S2) < 0; };
33  assert(std::is_sorted(std::begin(LibCalls), std::end(LibCalls), Comp));
34  return std::binary_search(std::begin(LibCalls), std::end(LibCalls),
35  CallSym, Comp);
36 }
37 
38 /// This function returns true if Ty is fp128, {f128} or i128 which was
39 /// originally a fp128.
40 static bool originalTypeIsF128(const Type *Ty, const char *Func) {
41  if (Ty->isFP128Ty())
42  return true;
43 
44  if (Ty->isStructTy() && Ty->getStructNumElements() == 1 &&
46  return true;
47 
48  // If the Ty is i128 and the function being called is a long double emulation
49  // routine, then the original type is f128.
50  return (Func && Ty->isIntegerTy(128) && isF128SoftLibCall(Func));
51 }
52 
53 /// Return true if the original type was vXfXX.
56  return true;
57 
58  return false;
59 }
60 
61 /// Return true if the original type was vXfXX / vXfXX.
62 static bool originalTypeIsVectorFloat(const Type * Ty) {
63  if (Ty->isVectorTy() && Ty->isFPOrFPVectorTy())
64  return true;
65 
66  return false;
67 }
68 
71  const MipsSubtarget &Subtarget) {
73  if (Subtarget.inMips16HardFloat()) {
74  if (const GlobalAddressSDNode *G =
75  dyn_cast<const GlobalAddressSDNode>(Callee)) {
76  llvm::StringRef Sym = G->getGlobal()->getName();
77  Function *F = G->getGlobal()->getParent()->getFunction(Sym);
78  if (F && F->hasFnAttribute("__Mips16RetHelper")) {
79  SpecialCallingConv = Mips16RetHelperConv;
80  }
81  }
82  }
83  return SpecialCallingConv;
84 }
85 
86 void MipsCCState::PreAnalyzeCallResultForF128(
88  const Type *RetTy, const char *Call) {
89  for (unsigned i = 0; i < Ins.size(); ++i) {
90  OriginalArgWasF128.push_back(
91  originalTypeIsF128(RetTy, Call));
92  OriginalArgWasFloat.push_back(RetTy->isFloatingPointTy());
93  }
94 }
95 
96 /// Identify lowered values that originated from f128 or float arguments and
97 /// record this for use by RetCC_MipsN.
98 void MipsCCState::PreAnalyzeReturnForF128(
99  const SmallVectorImpl<ISD::OutputArg> &Outs) {
100  const MachineFunction &MF = getMachineFunction();
101  for (unsigned i = 0; i < Outs.size(); ++i) {
102  OriginalArgWasF128.push_back(
103  originalTypeIsF128(MF.getFunction().getReturnType(), nullptr));
104  OriginalArgWasFloat.push_back(
106  }
107 }
108 
109 /// Identify lower values that originated from vXfXX and record
110 /// this.
111 void MipsCCState::PreAnalyzeCallResultForVectorFloat(
112  const SmallVectorImpl<ISD::InputArg> &Ins, const Type *RetTy) {
113  for (unsigned i = 0; i < Ins.size(); ++i) {
114  OriginalRetWasFloatVector.push_back(originalTypeIsVectorFloat(RetTy));
115  }
116 }
117 
118 /// Identify lowered values that originated from vXfXX arguments and record
119 /// this.
120 void MipsCCState::PreAnalyzeReturnForVectorFloat(
121  const SmallVectorImpl<ISD::OutputArg> &Outs) {
122  for (unsigned i = 0; i < Outs.size(); ++i) {
123  ISD::OutputArg Out = Outs[i];
124  OriginalRetWasFloatVector.push_back(
126  }
127 }
128 
129 /// Identify lowered values that originated from f128, float and sret to vXfXX
130 /// arguments and record this.
131 void MipsCCState::PreAnalyzeCallOperands(
133  std::vector<TargetLowering::ArgListEntry> &FuncArgs,
134  const char *Func) {
135  for (unsigned i = 0; i < Outs.size(); ++i) {
136  TargetLowering::ArgListEntry FuncArg = FuncArgs[Outs[i].OrigArgIndex];
137 
138  OriginalArgWasF128.push_back(originalTypeIsF128(FuncArg.Ty, Func));
139  OriginalArgWasFloat.push_back(FuncArg.Ty->isFloatingPointTy());
140  OriginalArgWasFloatVector.push_back(FuncArg.Ty->isVectorTy());
141  CallOperandIsFixed.push_back(Outs[i].IsFixed);
142  }
143 }
144 
145 /// Identify lowered values that originated from f128, float and vXfXX arguments
146 /// and record this.
147 void MipsCCState::PreAnalyzeFormalArgumentsForF128(
148  const SmallVectorImpl<ISD::InputArg> &Ins) {
149  const MachineFunction &MF = getMachineFunction();
150  for (unsigned i = 0; i < Ins.size(); ++i) {
152 
153  // SRet arguments cannot originate from f128 or {f128} returns so we just
154  // push false. We have to handle this specially since SRet arguments
155  // aren't mapped to an original argument.
156  if (Ins[i].Flags.isSRet()) {
157  OriginalArgWasF128.push_back(false);
158  OriginalArgWasFloat.push_back(false);
159  OriginalArgWasFloatVector.push_back(false);
160  continue;
161  }
162 
163  assert(Ins[i].getOrigArgIndex() < MF.getFunction().arg_size());
164  std::advance(FuncArg, Ins[i].getOrigArgIndex());
165 
166  OriginalArgWasF128.push_back(
167  originalTypeIsF128(FuncArg->getType(), nullptr));
168  OriginalArgWasFloat.push_back(FuncArg->getType()->isFloatingPointTy());
169 
170  // The MIPS vector ABI exhibits a corner case of sorts or quirk; if the
171  // first argument is actually an SRet pointer to a vector, then the next
172  // argument slot is $a2.
173  OriginalArgWasFloatVector.push_back(FuncArg->getType()->isVectorTy());
174  }
175 }
bool inMips16HardFloat() const
const_iterator end(StringRef path)
Get end iterator over path.
Definition: Path.cpp:233
This class represents an incoming formal argument to a Function.
Definition: Argument.h:29
const_iterator begin(StringRef path, Style style=Style::native)
Get begin iterator over path.
Definition: Path.cpp:224
This class represents lattice values for constants.
Definition: AllocatorList.h:23
void push_back(const T &Elt)
Definition: SmallVector.h:211
bool isFP128Ty() const
Return true if this is &#39;fp128&#39;.
Definition: Type.h:156
bool hasFnAttribute(Attribute::AttrKind Kind) const
Return true if the function has the attribute.
Definition: Function.h:323
F(f)
Type * getStructElementType(unsigned N) const
Definition: DerivedTypes.h:370
MachineFunction & getMachineFunction() const
bool isVectorTy() const
True if this is an instance of VectorType.
Definition: Type.h:230
bool isFloatingPoint() const
Return true if this is a FP or a vector FP type.
Definition: ValueTypes.h:135
bool isFloatingPointTy() const
Return true if this is one of the six floating-point types.
Definition: Type.h:162
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: APFloat.h:41
bool isIntegerTy() const
True if this is an instance of IntegerType.
Definition: Type.h:197
OutputArg - This struct carries flags and a value for a single outgoing (actual) argument or outgoing...
static bool originalEVTTypeIsVectorFloat(EVT Ty)
Return true if the original type was vXfXX.
Definition: MipsCCState.cpp:54
Type * getType() const
All values are typed, get the type of this value.
Definition: Value.h:246
static SpecialCallingConvType getSpecialCallingConvForCallee(const SDNode *Callee, const MipsSubtarget &Subtarget)
Determine the SpecialCallingConvType for the given callee.
Definition: MipsCCState.cpp:70
static bool isF128SoftLibCall(const char *CallSym)
This function returns true if CallSym is a long double emulation routine.
Definition: MipsCCState.cpp:16
Type * getReturnType() const
Returns the type of the ret val.
Definition: Function.h:168
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
size_t arg_size() const
Definition: Function.h:728
unsigned getStructNumElements() const
Definition: DerivedTypes.h:366
arg_iterator arg_begin()
Definition: Function.h:695
Extended Value Type.
Definition: ValueTypes.h:33
size_t size() const
Definition: SmallVector.h:52
EVT getVectorElementType() const
Given a vector type, return the type of each element.
Definition: ValueTypes.h:264
Module.h This file contains the declarations for the Module class.
const DataFlowGraph & G
Definition: RDFGraph.cpp:202
Represents one node in the SelectionDAG.
const Function & getFunction() const
Return the LLVM function that this machine code represents.
bool isVector() const
Return true if this is a vector value type.
Definition: ValueTypes.h:150
bool isFPOrFPVectorTy() const
Return true if this is a FP type or a vector of FP.
Definition: Type.h:185
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
static bool originalTypeIsVectorFloat(const Type *Ty)
Return true if the original type was vXfXX / vXfXX.
Definition: MipsCCState.cpp:62
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
static bool originalTypeIsF128(const Type *Ty, const char *Func)
This function returns true if Ty is fp128, {f128} or i128 which was originally a fp128.
Definition: MipsCCState.cpp:40
bool isStructTy() const
True if this is an instance of StructType.
Definition: Type.h:218