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