mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 11:42:57 +01:00
a3bb69f6c6
Summary: Some optimizations such as jump threading and loop unswitching can negatively affect performance when applied to divergent branches. The divergence analysis added in this patch conservatively estimates which branches in a GPU program can diverge. This information can then help LLVM to run certain optimizations selectively. Test Plan: test/Analysis/DivergenceAnalysis/NVPTX/diverge.ll Reviewers: resistor, hfinkel, eliben, meheff, jholewinski Subscribers: broune, bjarke.roune, madhur13490, tstellarAMD, dberlin, echristo, jholewinski, llvm-commits Differential Revision: http://reviews.llvm.org/D8576 llvm-svn: 234567
77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
//===-- NVPTXTargetTransformInfo.h - NVPTX 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
|
|
/// 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.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_LIB_TARGET_NVPTX_NVPTXTARGETTRANSFORMINFO_H
|
|
#define LLVM_LIB_TARGET_NVPTX_NVPTXTARGETTRANSFORMINFO_H
|
|
|
|
#include "NVPTX.h"
|
|
#include "NVPTXTargetMachine.h"
|
|
#include "llvm/Analysis/TargetTransformInfo.h"
|
|
#include "llvm/CodeGen/BasicTTIImpl.h"
|
|
#include "llvm/Target/TargetLowering.h"
|
|
|
|
namespace llvm {
|
|
|
|
class NVPTXTTIImpl : public BasicTTIImplBase<NVPTXTTIImpl> {
|
|
typedef BasicTTIImplBase<NVPTXTTIImpl> BaseT;
|
|
typedef TargetTransformInfo TTI;
|
|
friend BaseT;
|
|
|
|
const NVPTXSubtarget *ST;
|
|
const NVPTXTargetLowering *TLI;
|
|
|
|
const NVPTXSubtarget *getST() const { return ST; };
|
|
const NVPTXTargetLowering *getTLI() const { return TLI; };
|
|
|
|
public:
|
|
explicit NVPTXTTIImpl(const NVPTXTargetMachine *TM)
|
|
: BaseT(TM), ST(TM->getSubtargetImpl()), TLI(ST->getTargetLowering()) {}
|
|
|
|
// Provide value semantics. MSVC requires that we spell all of these out.
|
|
NVPTXTTIImpl(const NVPTXTTIImpl &Arg)
|
|
: BaseT(static_cast<const BaseT &>(Arg)), ST(Arg.ST), TLI(Arg.TLI) {}
|
|
NVPTXTTIImpl(NVPTXTTIImpl &&Arg)
|
|
: BaseT(std::move(static_cast<BaseT &>(Arg))), ST(std::move(Arg.ST)),
|
|
TLI(std::move(Arg.TLI)) {}
|
|
NVPTXTTIImpl &operator=(const NVPTXTTIImpl &RHS) {
|
|
BaseT::operator=(static_cast<const BaseT &>(RHS));
|
|
ST = RHS.ST;
|
|
TLI = RHS.TLI;
|
|
return *this;
|
|
}
|
|
NVPTXTTIImpl &operator=(NVPTXTTIImpl &&RHS) {
|
|
BaseT::operator=(std::move(static_cast<BaseT &>(RHS)));
|
|
ST = std::move(RHS.ST);
|
|
TLI = std::move(RHS.TLI);
|
|
return *this;
|
|
}
|
|
|
|
bool hasBranchDivergence() { return true; }
|
|
|
|
bool isSourceOfDivergence(const Value *V);
|
|
|
|
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);
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|