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| 1 //===-- JSTargetTransformInfo.cpp - JS 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 implements a TargetTransformInfo::Concept conforming object | |
| 11 /// specific to the JS target machine. It uses the target's detailed information | |
| 12 /// to 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 #define DEBUG_TYPE "jstti" | |
| 18 #include "JS.h" | |
| 19 #include "JSTargetMachine.h" | |
| 20 #include "JSTargetTransformInfo.h" | |
| 21 #include "llvm/Support/Debug.h" | |
| 22 #include "llvm/Target/TargetLowering.h" | |
| 23 #include "llvm/Target/CostTable.h" | |
| 24 using namespace llvm; | |
| 25 | |
| 26 //===----------------------------------------------------------------------===// | |
| 27 // | |
| 28 // JS cost model. | |
| 29 // | |
| 30 //===----------------------------------------------------------------------===// | |
| 31 | |
| 32 TargetTransformInfo::PopcntSupportKind JSTTI::getPopcntSupport( | |
| 33 unsigned TyWidth) { | |
| 34 assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2"); | |
| 35 // Hopefully we'll get popcnt in ES7, but for now, we just have software. | |
| 36 return TargetTransformInfo::PSK_Software; | |
| 37 } | |
| 38 | |
| 39 unsigned JSTTI::getRegisterBitWidth(bool Vector) const { | |
| 40 if (Vector) { | |
| 41 return 128; | |
| 42 } | |
| 43 | |
| 44 return 32; | |
| 45 } | |
| 46 | |
| 47 unsigned JSTTI::getArithmeticInstrCost( | |
| 48 unsigned Opcode, Type *Ty, TTI::OperandValueKind Opd1Info, | |
| 49 TTI::OperandValueKind Opd2Info, TTI::OperandValueProperties Opd1PropInfo, | |
| 50 TTI::OperandValueProperties Opd2PropInfo) { | |
| 51 const unsigned Nope = 65536; | |
| 52 | |
| 53 unsigned Cost = BasicTTIImplBase<JSTTI>::getArithmeticInstrCost(Opcode, Ty, Op
d1Info, Opd2Info); | |
| 54 | |
| 55 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) { | |
| 56 switch (VTy->getNumElements()) { | |
| 57 case 4: | |
| 58 // SIMD.js supports int32x4 and float32x4, and we can emulate <4 x i1>. | |
| 59 if (!VTy->getElementType()->isIntegerTy(1) && | |
| 60 !VTy->getElementType()->isIntegerTy(32) && | |
| 61 !VTy->getElementType()->isFloatTy()) | |
| 62 { | |
| 63 return Nope; | |
| 64 } | |
| 65 break; | |
| 66 default: | |
| 67 // Wait until the other types are optimized. | |
| 68 return Nope; | |
| 69 } | |
| 70 | |
| 71 switch (Opcode) { | |
| 72 case Instruction::LShr: | |
| 73 case Instruction::AShr: | |
| 74 case Instruction::Shl: | |
| 75 // SIMD.js' shifts are currently only ByScalar. | |
| 76 if (Opd2Info != TTI::OK_UniformValue && Opd2Info != TTI::OK_UniformConst
antValue) | |
| 77 Cost = Cost * VTy->getNumElements() + 100; | |
| 78 break; | |
| 79 } | |
| 80 } | |
| 81 | |
| 82 return Cost; | |
| 83 } | |
| 84 | |
| 85 unsigned JSTTI::getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index) { | |
| 86 unsigned Cost = BasicTTIImplBase::getVectorInstrCost(Opcode, Val, Index); | |
| 87 | |
| 88 // SIMD.js' insert/extract currently only take constant indices. | |
| 89 if (Index == -1u) | |
| 90 return Cost + 100; | |
| 91 | |
| 92 return Cost; | |
| 93 } | |
| 94 | |
| 95 void JSTTI::getUnrollingPreferences(Loop *L, | |
| 96 TTI::UnrollingPreferences &UP) const { | |
| 97 // We generally don't want a lot of unrolling. | |
| 98 UP.Partial = false; | |
| 99 UP.Runtime = false; | |
| 100 } | |
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Chromium Code Reviews
Issue 1692803002:
Remove Emscripten support (Closed)
Base URL: https://chromium.googlesource.com/a/native_client/pnacl-llvm.git@master