llvm-6502/include/llvm/LinkAllPasses.h
Jingyue Wu 2918efd551 Add straight-line strength reduction to LLVM
Summary:
Straight-line strength reduction (SLSR) is implemented in GCC but not yet in
LLVM. It has proven to effectively simplify statements derived from an unrolled
loop, and can potentially benefit many other cases too. For example,

LLVM unrolls

  #pragma unroll
  foo (int i = 0; i < 3; ++i) {
    sum += foo((b + i) * s);
  }

into

  sum += foo(b * s);
  sum += foo((b + 1) * s);
  sum += foo((b + 2) * s);

However, no optimizations yet reduce the internal redundancy of the three
expressions:

  b * s
  (b + 1) * s
  (b + 2) * s

With SLSR, LLVM can optimize these three expressions into:

  t1 = b * s
  t2 = t1 + s
  t3 = t2 + s

This commit is only an initial step towards implementing a series of such
optimizations. I will implement more (see TODO in the file commentary) in the
near future. This optimization is enabled for the NVPTX backend for now.
However, I am more than happy to push it to the standard optimization pipeline
after more thorough performance tests.

Test Plan: test/StraightLineStrengthReduce/slsr.ll

Reviewers: eliben, HaoLiu, meheff, hfinkel, jholewinski, atrick

Reviewed By: jholewinski, atrick

Subscribers: karthikthecool, jholewinski, llvm-commits

Differential Revision: http://reviews.llvm.org/D7310

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228016 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-03 19:37:06 +00:00

184 lines
8.0 KiB
C++

//===- llvm/LinkAllPasses.h ------------ Reference All Passes ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header file pulls in all transformation and analysis passes for tools
// like opt and bugpoint that need this functionality.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LINKALLPASSES_H
#define LLVM_LINKALLPASSES_H
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/Analysis/CallPrinter.h"
#include "llvm/Analysis/DomPrinter.h"
#include "llvm/Analysis/IntervalPartition.h"
#include "llvm/Analysis/Lint.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/PostDominators.h"
#include "llvm/Analysis/RegionPass.h"
#include "llvm/Analysis/RegionPrinter.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRPrintingPasses.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/Instrumentation.h"
#include "llvm/Transforms/ObjCARC.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/SymbolRewriter.h"
#include "llvm/Transforms/Utils/UnifyFunctionExitNodes.h"
#include "llvm/Transforms/Vectorize.h"
#include <cstdlib>
namespace {
struct ForcePassLinking {
ForcePassLinking() {
// We must reference the passes in such a way that compilers will not
// delete it all as dead code, even with whole program optimization,
// yet is effectively a NO-OP. As the compiler isn't smart enough
// to know that getenv() never returns -1, this will do the job.
if (std::getenv("bar") != (char*) -1)
return;
(void) llvm::createAAEvalPass();
(void) llvm::createAggressiveDCEPass();
(void) llvm::createAliasAnalysisCounterPass();
(void) llvm::createAliasDebugger();
(void) llvm::createArgumentPromotionPass();
(void) llvm::createAlignmentFromAssumptionsPass();
(void) llvm::createBasicAliasAnalysisPass();
(void) llvm::createLibCallAliasAnalysisPass(nullptr);
(void) llvm::createScalarEvolutionAliasAnalysisPass();
(void) llvm::createTypeBasedAliasAnalysisPass();
(void) llvm::createScopedNoAliasAAPass();
(void) llvm::createBoundsCheckingPass();
(void) llvm::createBreakCriticalEdgesPass();
(void) llvm::createCallGraphPrinterPass();
(void) llvm::createCallGraphViewerPass();
(void) llvm::createCFGSimplificationPass();
(void) llvm::createCFLAliasAnalysisPass();
(void) llvm::createStructurizeCFGPass();
(void) llvm::createConstantMergePass();
(void) llvm::createConstantPropagationPass();
(void) llvm::createCostModelAnalysisPass();
(void) llvm::createDeadArgEliminationPass();
(void) llvm::createDeadCodeEliminationPass();
(void) llvm::createDeadInstEliminationPass();
(void) llvm::createDeadStoreEliminationPass();
(void) llvm::createDependenceAnalysisPass();
(void) llvm::createDomOnlyPrinterPass();
(void) llvm::createDomPrinterPass();
(void) llvm::createDomOnlyViewerPass();
(void) llvm::createDomViewerPass();
(void) llvm::createGCOVProfilerPass();
(void) llvm::createInstrProfilingPass();
(void) llvm::createFunctionInliningPass();
(void) llvm::createAlwaysInlinerPass();
(void) llvm::createGlobalDCEPass();
(void) llvm::createGlobalOptimizerPass();
(void) llvm::createGlobalsModRefPass();
(void) llvm::createIPConstantPropagationPass();
(void) llvm::createIPSCCPPass();
(void) llvm::createInductiveRangeCheckEliminationPass();
(void) llvm::createIndVarSimplifyPass();
(void) llvm::createInstructionCombiningPass();
(void) llvm::createInternalizePass();
(void) llvm::createJumpInstrTableInfoPass();
(void) llvm::createJumpInstrTablesPass();
(void) llvm::createLCSSAPass();
(void) llvm::createLICMPass();
(void) llvm::createLazyValueInfoPass();
(void) llvm::createLoopExtractorPass();
(void) llvm::createLoopSimplifyPass();
(void) llvm::createLoopStrengthReducePass();
(void) llvm::createLoopRerollPass();
(void) llvm::createLoopUnrollPass();
(void) llvm::createLoopUnswitchPass();
(void) llvm::createLoopIdiomPass();
(void) llvm::createLoopRotatePass();
(void) llvm::createLowerExpectIntrinsicPass();
(void) llvm::createLowerInvokePass();
(void) llvm::createLowerSwitchPass();
(void) llvm::createNoAAPass();
(void) llvm::createObjCARCAliasAnalysisPass();
(void) llvm::createObjCARCAPElimPass();
(void) llvm::createObjCARCExpandPass();
(void) llvm::createObjCARCContractPass();
(void) llvm::createObjCARCOptPass();
(void) llvm::createPAEvalPass();
(void) llvm::createPromoteMemoryToRegisterPass();
(void) llvm::createDemoteRegisterToMemoryPass();
(void) llvm::createPruneEHPass();
(void) llvm::createPostDomOnlyPrinterPass();
(void) llvm::createPostDomPrinterPass();
(void) llvm::createPostDomOnlyViewerPass();
(void) llvm::createPostDomViewerPass();
(void) llvm::createReassociatePass();
(void) llvm::createRegionInfoPass();
(void) llvm::createRegionOnlyPrinterPass();
(void) llvm::createRegionOnlyViewerPass();
(void) llvm::createRegionPrinterPass();
(void) llvm::createRegionViewerPass();
(void) llvm::createSCCPPass();
(void) llvm::createScalarReplAggregatesPass();
(void) llvm::createSingleLoopExtractorPass();
(void) llvm::createStripSymbolsPass();
(void) llvm::createStripNonDebugSymbolsPass();
(void) llvm::createStripDeadDebugInfoPass();
(void) llvm::createStripDeadPrototypesPass();
(void) llvm::createTailCallEliminationPass();
(void) llvm::createJumpThreadingPass();
(void) llvm::createUnifyFunctionExitNodesPass();
(void) llvm::createInstCountPass();
(void) llvm::createConstantHoistingPass();
(void) llvm::createCodeGenPreparePass();
(void) llvm::createEarlyCSEPass();
(void) llvm::createMergedLoadStoreMotionPass();
(void) llvm::createGVNPass();
(void) llvm::createMemCpyOptPass();
(void) llvm::createLoopDeletionPass();
(void) llvm::createPostDomTree();
(void) llvm::createInstructionNamerPass();
(void) llvm::createMetaRenamerPass();
(void) llvm::createFunctionAttrsPass();
(void) llvm::createMergeFunctionsPass();
(void) llvm::createPrintModulePass(*(llvm::raw_ostream*)nullptr);
(void) llvm::createPrintFunctionPass(*(llvm::raw_ostream*)nullptr);
(void) llvm::createPrintBasicBlockPass(*(llvm::raw_ostream*)nullptr);
(void) llvm::createModuleDebugInfoPrinterPass();
(void) llvm::createPartialInliningPass();
(void) llvm::createLintPass();
(void) llvm::createSinkingPass();
(void) llvm::createLowerAtomicPass();
(void) llvm::createCorrelatedValuePropagationPass();
(void) llvm::createMemDepPrinter();
(void) llvm::createInstructionSimplifierPass();
(void) llvm::createLoopVectorizePass();
(void) llvm::createSLPVectorizerPass();
(void) llvm::createBBVectorizePass();
(void) llvm::createPartiallyInlineLibCallsPass();
(void) llvm::createScalarizerPass();
(void) llvm::createSeparateConstOffsetFromGEPPass();
(void) llvm::createRewriteSymbolsPass();
(void) llvm::createStraightLineStrengthReducePass();
(void)new llvm::IntervalPartition();
(void)new llvm::ScalarEvolution();
((llvm::Function*)nullptr)->viewCFGOnly();
llvm::RGPassManager RGM;
((llvm::RegionPass*)nullptr)->runOnRegion((llvm::Region*)nullptr, RGM);
llvm::AliasSetTracker X(*(llvm::AliasAnalysis*)nullptr);
X.add(nullptr, 0, llvm::AAMDNodes()); // for -print-alias-sets
}
} ForcePassLinking; // Force link by creating a global definition.
}
#endif