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57e6b2d1f3
Merge consecutive if-regions if they contain identical statements. Both transformations reduce number of branches. The transformation is guarded by a target-hook, and is currently enabled only for +R600, but the correctness has been tested on X86 target using a variety of CPU benchmarks. Patch by: Mei Ye git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187278 91177308-0d34-0410-b5e6-96231b3b80d8
91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
//===-- AMDGPUTargetTransformInfo.cpp - AMDGPU 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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// AMDGPU 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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#define DEBUG_TYPE "AMDGPUtti"
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#include "AMDGPU.h"
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#include "AMDGPUTargetMachine.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/CostTable.h"
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using namespace llvm;
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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 initializeAMDGPUTTIPass(PassRegistry &);
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}
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namespace {
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class AMDGPUTTI : public ImmutablePass, public TargetTransformInfo {
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const AMDGPUTargetMachine *TM;
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const AMDGPUSubtarget *ST;
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const AMDGPUTargetLowering *TLI;
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/// Estimate the overhead of scalarizing an instruction. Insert and Extract
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/// are set if the result needs to be inserted and/or extracted from vectors.
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unsigned getScalarizationOverhead(Type *Ty, bool Insert, bool Extract) const;
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public:
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AMDGPUTTI() : ImmutablePass(ID), TM(0), ST(0), TLI(0) {
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llvm_unreachable("This pass cannot be directly constructed");
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}
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AMDGPUTTI(const AMDGPUTargetMachine *TM)
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: ImmutablePass(ID), TM(TM), ST(TM->getSubtargetImpl()),
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TLI(TM->getTargetLowering()) {
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initializeAMDGPUTTIPass(*PassRegistry::getPassRegistry());
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}
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virtual void initializePass() { pushTTIStack(this); }
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virtual void finalizePass() { popTTIStack(); }
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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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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virtual void *getAdjustedAnalysisPointer(const void *ID) {
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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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virtual bool hasBranchDivergence() const;
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/// @}
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};
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} // end anonymous namespace
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INITIALIZE_AG_PASS(AMDGPUTTI, TargetTransformInfo, "AMDGPUtti",
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"AMDGPU Target Transform Info", true, true, false)
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char AMDGPUTTI::ID = 0;
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ImmutablePass *
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llvm::createAMDGPUTargetTransformInfoPass(const AMDGPUTargetMachine *TM) {
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return new AMDGPUTTI(TM);
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}
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bool AMDGPUTTI::hasBranchDivergence() const { return true; }
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