LLVM  6.0.0svn
NVPTXTargetTransformInfo.h
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1 //===-- NVPTXTargetTransformInfo.h - NVPTX specific TTI ---------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 /// \file
10 /// This file a TargetTransformInfo::Concept conforming object specific to the
11 /// NVPTX target machine. It uses the target's detailed information to
12 /// provide more precise answers to certain TTI queries, while letting the
13 /// target independent and default TTI implementations handle the rest.
14 ///
15 //===----------------------------------------------------------------------===//
16 
17 #ifndef LLVM_LIB_TARGET_NVPTX_NVPTXTARGETTRANSFORMINFO_H
18 #define LLVM_LIB_TARGET_NVPTX_NVPTXTARGETTRANSFORMINFO_H
19 
20 #include "NVPTX.h"
21 #include "NVPTXTargetMachine.h"
25 
26 namespace llvm {
27 
28 class NVPTXTTIImpl : public BasicTTIImplBase<NVPTXTTIImpl> {
30  typedef TargetTransformInfo TTI;
31  friend BaseT;
32 
33  const NVPTXSubtarget *ST;
34  const NVPTXTargetLowering *TLI;
35 
36  const NVPTXSubtarget *getST() const { return ST; };
37  const NVPTXTargetLowering *getTLI() const { return TLI; };
38 
39 public:
40  explicit NVPTXTTIImpl(const NVPTXTargetMachine *TM, const Function &F)
41  : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl()),
42  TLI(ST->getTargetLowering()) {}
43 
44  bool hasBranchDivergence() { return true; }
45 
46  bool isSourceOfDivergence(const Value *V);
47 
48  unsigned getFlatAddressSpace() const {
50  }
51 
52  // Increase the inlining cost threshold by a factor of 5, reflecting that
53  // calls are particularly expensive in NVPTX.
54  unsigned getInliningThresholdMultiplier() { return 5; }
55 
57  unsigned Opcode, Type *Ty,
63 
66  bool hasVolatileVariant(Instruction *I, unsigned AddrSpace) {
67  // Volatile loads/stores are only supported for shared and global address
68  // spaces, or for generic AS that maps to them.
69  if (!(AddrSpace == llvm::ADDRESS_SPACE_GENERIC ||
70  AddrSpace == llvm::ADDRESS_SPACE_GLOBAL ||
71  AddrSpace == llvm::ADDRESS_SPACE_SHARED))
72  return false;
73 
74  switch(I->getOpcode()){
75  default:
76  return false;
77  case Instruction::Load:
78  case Instruction::Store:
79  return true;
80  }
81  }
82 };
83 
84 } // end namespace llvm
85 
86 #endif
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
unsigned getFlatAddressSpace() const
NVPTXTTIImpl(const NVPTXTargetMachine *TM, const Function &F)
The main scalar evolution driver.
F(f)
Base class which can be used to help build a TTI implementation.
Definition: BasicTTIImpl.h:78
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: APInt.h:33
unsigned getOpcode() const
Returns a member of one of the enums like Instruction::Add.
Definition: Instruction.h:125
int getArithmeticInstrCost(unsigned Opcode, Type *Ty, TTI::OperandValueKind Opd1Info=TTI::OK_AnyValue, TTI::OperandValueKind Opd2Info=TTI::OK_AnyValue, TTI::OperandValueProperties Opd1PropInfo=TTI::OP_None, TTI::OperandValueProperties Opd2PropInfo=TTI::OP_None, ArrayRef< const Value *> Args=ArrayRef< const Value *>())
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
bool isSourceOfDivergence(const Value *V)
This file provides a helper that implements much of the TTI interface in terms of the target-independ...
bool hasVolatileVariant(Instruction *I, unsigned AddrSpace)
OperandValueProperties
Additional properties of an operand&#39;s values.
unsigned getInliningThresholdMultiplier()
This pass provides access to the codegen interfaces that are needed for IR-level transformations.
NVPTXTargetMachine.
Represents a single loop in the control flow graph.
Definition: LoopInfo.h:439
Parameters that control the generic loop unrolling transformation.
void getUnrollingPreferences(Loop *L, ScalarEvolution &SE, TTI::UnrollingPreferences &UP)
#define I(x, y, z)
Definition: MD5.cpp:58
LLVM Value Representation.
Definition: Value.h:73
static const Function * getParent(const Value *V)
const DataLayout & getDataLayout() const
OperandValueKind
Additional information about an operand&#39;s possible values.
This pass exposes codegen information to IR-level passes.
constexpr char Args[]
Key for Kernel::Metadata::mArgs.
This file describes how to lower LLVM code to machine code.