llvm-6502/lib/Target/PowerPC/PPCTargetTransformInfo.h
Wei Mi cac51be31f [X86] Disable loop unrolling in loop vectorization pass when VF is 1.
The patch disabled unrolling in loop vectorization pass when VF==1 on x86 architecture,
by setting MaxInterleaveFactor to 1. Unrolling in loop vectorization pass may introduce
the cost of overflow check, memory boundary check and extra prologue/epilogue code when
regular unroller will unroll the loop another time. Disable it when VF==1 remove the
unnecessary cost on x86. The same can be done for other platforms after verifying
interleaving/memory bound checking to be not perf critical on those platforms.

Differential Revision: http://reviews.llvm.org/D9515


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236613 91177308-0d34-0410-b5e6-96231b3b80d8
2015-05-06 17:12:25 +00:00

105 lines
3.7 KiB
C++

//===-- PPCTargetTransformInfo.h - PPC specific TTI -------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
/// This file a TargetTransformInfo::Concept conforming object specific to the
/// PPC 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.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_POWERPC_PPCTARGETTRANSFORMINFO_H
#define LLVM_LIB_TARGET_POWERPC_PPCTARGETTRANSFORMINFO_H
#include "PPC.h"
#include "PPCTargetMachine.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/BasicTTIImpl.h"
#include "llvm/Target/TargetLowering.h"
namespace llvm {
class PPCTTIImpl : public BasicTTIImplBase<PPCTTIImpl> {
typedef BasicTTIImplBase<PPCTTIImpl> BaseT;
typedef TargetTransformInfo TTI;
friend BaseT;
const PPCSubtarget *ST;
const PPCTargetLowering *TLI;
const PPCSubtarget *getST() const { return ST; }
const PPCTargetLowering *getTLI() const { return TLI; }
public:
explicit PPCTTIImpl(const PPCTargetMachine *TM, Function &F)
: BaseT(TM), ST(TM->getSubtargetImpl(F)), TLI(ST->getTargetLowering()) {}
// Provide value semantics. MSVC requires that we spell all of these out.
PPCTTIImpl(const PPCTTIImpl &Arg)
: BaseT(static_cast<const BaseT &>(Arg)), ST(Arg.ST), TLI(Arg.TLI) {}
PPCTTIImpl(PPCTTIImpl &&Arg)
: BaseT(std::move(static_cast<BaseT &>(Arg))), ST(std::move(Arg.ST)),
TLI(std::move(Arg.TLI)) {}
PPCTTIImpl &operator=(const PPCTTIImpl &RHS) {
BaseT::operator=(static_cast<const BaseT &>(RHS));
ST = RHS.ST;
TLI = RHS.TLI;
return *this;
}
PPCTTIImpl &operator=(PPCTTIImpl &&RHS) {
BaseT::operator=(std::move(static_cast<BaseT &>(RHS)));
ST = std::move(RHS.ST);
TLI = std::move(RHS.TLI);
return *this;
}
/// \name Scalar TTI Implementations
/// @{
using BaseT::getIntImmCost;
unsigned getIntImmCost(const APInt &Imm, Type *Ty);
unsigned getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm,
Type *Ty);
unsigned getIntImmCost(Intrinsic::ID IID, unsigned Idx, const APInt &Imm,
Type *Ty);
TTI::PopcntSupportKind getPopcntSupport(unsigned TyWidth);
void getUnrollingPreferences(Loop *L, TTI::UnrollingPreferences &UP);
/// @}
/// \name Vector TTI Implementations
/// @{
bool enableAggressiveInterleaving(bool LoopHasReductions);
unsigned getNumberOfRegisters(bool Vector);
unsigned getRegisterBitWidth(bool Vector);
unsigned getMaxInterleaveFactor(unsigned VF);
unsigned 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);
unsigned getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index,
Type *SubTp);
unsigned getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src);
unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy);
unsigned getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index);
unsigned getMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment,
unsigned AddressSpace);
/// @}
};
} // end namespace llvm
#endif