forked from OSchip/llvm-project
116 lines
3.8 KiB
C++
116 lines
3.8 KiB
C++
//===-- NVPTXTargetTransformInfo.cpp - NVPTX specific TTI pass ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// \file
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// This file implements a TargetTransformInfo analysis pass specific to the
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// NVPTX target machine. It uses the target's detailed information to provide
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// more precise answers to certain TTI queries, while letting the target
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// independent and default TTI implementations handle the rest.
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//
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//===----------------------------------------------------------------------===//
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#include "NVPTXTargetMachine.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/Analysis/ValueTracking.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Target/CostTable.h"
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#include "llvm/Target/TargetLowering.h"
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using namespace llvm;
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#define DEBUG_TYPE "NVPTXtti"
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// Declare the pass initialization routine locally as target-specific passes
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// don't have a target-wide initialization entry point, and so we rely on the
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// pass constructor initialization.
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namespace llvm {
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void initializeNVPTXTTIPass(PassRegistry &);
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}
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namespace {
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class NVPTXTTI final : public ImmutablePass, public TargetTransformInfo {
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const NVPTXTargetLowering *TLI;
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public:
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NVPTXTTI() : ImmutablePass(ID), TLI(nullptr) {
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llvm_unreachable("This pass cannot be directly constructed");
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}
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NVPTXTTI(const NVPTXTargetMachine *TM)
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: ImmutablePass(ID), TLI(TM->getSubtargetImpl()->getTargetLowering()) {
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initializeNVPTXTTIPass(*PassRegistry::getPassRegistry());
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}
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void initializePass() override { pushTTIStack(this); }
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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TargetTransformInfo::getAnalysisUsage(AU);
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}
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/// Pass identification.
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static char ID;
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/// Provide necessary pointer adjustments for the two base classes.
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void *getAdjustedAnalysisPointer(const void *ID) override {
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if (ID == &TargetTransformInfo::ID)
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return (TargetTransformInfo *)this;
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return this;
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}
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bool hasBranchDivergence() const override;
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unsigned getArithmeticInstrCost(
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unsigned Opcode, Type *Ty, OperandValueKind Opd1Info = OK_AnyValue,
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OperandValueKind Opd2Info = OK_AnyValue,
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OperandValueProperties Opd1PropInfo = OP_None,
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OperandValueProperties Opd2PropInfo = OP_None) const override;
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};
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} // end anonymous namespace
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INITIALIZE_AG_PASS(NVPTXTTI, TargetTransformInfo, "NVPTXtti",
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"NVPTX Target Transform Info", true, true, false)
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char NVPTXTTI::ID = 0;
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ImmutablePass *
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llvm::createNVPTXTargetTransformInfoPass(const NVPTXTargetMachine *TM) {
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return new NVPTXTTI(TM);
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}
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bool NVPTXTTI::hasBranchDivergence() const { return true; }
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unsigned NVPTXTTI::getArithmeticInstrCost(
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unsigned Opcode, Type *Ty, OperandValueKind Opd1Info,
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OperandValueKind Opd2Info, OperandValueProperties Opd1PropInfo,
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OperandValueProperties Opd2PropInfo) const {
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// Legalize the type.
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std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Ty);
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int ISD = TLI->InstructionOpcodeToISD(Opcode);
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switch (ISD) {
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default:
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return TargetTransformInfo::getArithmeticInstrCost(
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Opcode, Ty, Opd1Info, Opd2Info, Opd1PropInfo, Opd2PropInfo);
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case ISD::ADD:
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case ISD::MUL:
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case ISD::XOR:
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case ISD::OR:
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case ISD::AND:
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// The machine code (SASS) simulates an i64 with two i32. Therefore, we
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// estimate that arithmetic operations on i64 are twice as expensive as
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// those on types that can fit into one machine register.
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if (LT.second.SimpleTy == MVT::i64)
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return 2 * LT.first;
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// Delegate other cases to the basic TTI.
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return TargetTransformInfo::getArithmeticInstrCost(
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Opcode, Ty, Opd1Info, Opd2Info, Opd1PropInfo, Opd2PropInfo);
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}
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}
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