Files
clang-p2996/llvm/lib/Transforms/Scalar/Scalar.cpp
Kit Barton 3cdf87940f Add basic loop fusion pass.
This patch adds a basic loop fusion pass. It will fuse loops that conform to the
following 4 conditions:
  1. Adjacent (no code between them)
  2. Control flow equivalent (if one loop executes, the other loop executes)
  3. Identical bounds (both loops iterate the same number of iterations)
  4. No negative distance dependencies between the loop bodies.

The pass does not make any changes to the IR to create opportunities for fusion.
Instead, it checks if the necessary conditions are met and if so it fuses two
loops together.

The pass has not been added to the pass pipeline yet, and thus is not enabled by
default. It can be run stand alone using the -loop-fusion option.

Differential Revision: https://reviews.llvm.org/D55851

llvm-svn: 358607
2019-04-17 18:53:27 +00:00

290 lines
9.7 KiB
C++

//===-- Scalar.cpp --------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements common infrastructure for libLLVMScalarOpts.a, which
// implements several scalar transformations over the LLVM intermediate
// representation, including the C bindings for that library.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Scalar.h"
#include "llvm-c/Initialization.h"
#include "llvm-c/Transforms/Scalar.h"
#include "llvm/Analysis/BasicAliasAnalysis.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/ScopedNoAliasAA.h"
#include "llvm/Analysis/TypeBasedAliasAnalysis.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Verifier.h"
#include "llvm/InitializePasses.h"
#include "llvm/Transforms/Scalar/GVN.h"
#include "llvm/Transforms/Scalar/Scalarizer.h"
#include "llvm/Transforms/Scalar/SimpleLoopUnswitch.h"
#include "llvm/Transforms/Utils/UnifyFunctionExitNodes.h"
using namespace llvm;
/// initializeScalarOptsPasses - Initialize all passes linked into the
/// ScalarOpts library.
void llvm::initializeScalarOpts(PassRegistry &Registry) {
initializeADCELegacyPassPass(Registry);
initializeBDCELegacyPassPass(Registry);
initializeAlignmentFromAssumptionsPass(Registry);
initializeCallSiteSplittingLegacyPassPass(Registry);
initializeConstantHoistingLegacyPassPass(Registry);
initializeConstantPropagationPass(Registry);
initializeCorrelatedValuePropagationPass(Registry);
initializeDCELegacyPassPass(Registry);
initializeDeadInstEliminationPass(Registry);
initializeDivRemPairsLegacyPassPass(Registry);
initializeScalarizerLegacyPassPass(Registry);
initializeDSELegacyPassPass(Registry);
initializeGuardWideningLegacyPassPass(Registry);
initializeLoopGuardWideningLegacyPassPass(Registry);
initializeGVNLegacyPassPass(Registry);
initializeNewGVNLegacyPassPass(Registry);
initializeEarlyCSELegacyPassPass(Registry);
initializeEarlyCSEMemSSALegacyPassPass(Registry);
initializeMakeGuardsExplicitLegacyPassPass(Registry);
initializeGVNHoistLegacyPassPass(Registry);
initializeGVNSinkLegacyPassPass(Registry);
initializeFlattenCFGPassPass(Registry);
initializeIRCELegacyPassPass(Registry);
initializeIndVarSimplifyLegacyPassPass(Registry);
initializeInferAddressSpacesPass(Registry);
initializeInstSimplifyLegacyPassPass(Registry);
initializeJumpThreadingPass(Registry);
initializeLegacyLICMPassPass(Registry);
initializeLegacyLoopSinkPassPass(Registry);
initializeLoopFuseLegacyPass(Registry);
initializeLoopDataPrefetchLegacyPassPass(Registry);
initializeLoopDeletionLegacyPassPass(Registry);
initializeLoopAccessLegacyAnalysisPass(Registry);
initializeLoopInstSimplifyLegacyPassPass(Registry);
initializeLoopInterchangePass(Registry);
initializeLoopPredicationLegacyPassPass(Registry);
initializeLoopRotateLegacyPassPass(Registry);
initializeLoopStrengthReducePass(Registry);
initializeLoopRerollPass(Registry);
initializeLoopUnrollPass(Registry);
initializeLoopUnrollAndJamPass(Registry);
initializeLoopUnswitchPass(Registry);
initializeWarnMissedTransformationsLegacyPass(Registry);
initializeLoopVersioningLICMPass(Registry);
initializeLoopIdiomRecognizeLegacyPassPass(Registry);
initializeLowerAtomicLegacyPassPass(Registry);
initializeLowerExpectIntrinsicPass(Registry);
initializeLowerGuardIntrinsicLegacyPassPass(Registry);
initializeLowerWidenableConditionLegacyPassPass(Registry);
initializeMemCpyOptLegacyPassPass(Registry);
initializeMergeICmpsPass(Registry);
initializeMergedLoadStoreMotionLegacyPassPass(Registry);
initializeNaryReassociateLegacyPassPass(Registry);
initializePartiallyInlineLibCallsLegacyPassPass(Registry);
initializeReassociateLegacyPassPass(Registry);
initializeRegToMemPass(Registry);
initializeRewriteStatepointsForGCLegacyPassPass(Registry);
initializeSCCPLegacyPassPass(Registry);
initializeSROALegacyPassPass(Registry);
initializeCFGSimplifyPassPass(Registry);
initializeStructurizeCFGPass(Registry);
initializeSimpleLoopUnswitchLegacyPassPass(Registry);
initializeSinkingLegacyPassPass(Registry);
initializeTailCallElimPass(Registry);
initializeSeparateConstOffsetFromGEPPass(Registry);
initializeSpeculativeExecutionLegacyPassPass(Registry);
initializeStraightLineStrengthReducePass(Registry);
initializePlaceBackedgeSafepointsImplPass(Registry);
initializePlaceSafepointsPass(Registry);
initializeFloat2IntLegacyPassPass(Registry);
initializeLoopDistributeLegacyPass(Registry);
initializeLoopLoadEliminationPass(Registry);
initializeLoopSimplifyCFGLegacyPassPass(Registry);
initializeLoopVersioningPassPass(Registry);
initializeEntryExitInstrumenterPass(Registry);
initializePostInlineEntryExitInstrumenterPass(Registry);
}
void LLVMAddLoopSimplifyCFGPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLoopSimplifyCFGPass());
}
void LLVMInitializeScalarOpts(LLVMPassRegistryRef R) {
initializeScalarOpts(*unwrap(R));
}
void LLVMAddAggressiveDCEPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createAggressiveDCEPass());
}
void LLVMAddBitTrackingDCEPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createBitTrackingDCEPass());
}
void LLVMAddAlignmentFromAssumptionsPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createAlignmentFromAssumptionsPass());
}
void LLVMAddCFGSimplificationPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createCFGSimplificationPass(1, false, false, true));
}
void LLVMAddDeadStoreEliminationPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createDeadStoreEliminationPass());
}
void LLVMAddScalarizerPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createScalarizerPass());
}
void LLVMAddGVNPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createGVNPass());
}
void LLVMAddNewGVNPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createNewGVNPass());
}
void LLVMAddMergedLoadStoreMotionPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createMergedLoadStoreMotionPass());
}
void LLVMAddIndVarSimplifyPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createIndVarSimplifyPass());
}
void LLVMAddJumpThreadingPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createJumpThreadingPass());
}
void LLVMAddLoopSinkPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLoopSinkPass());
}
void LLVMAddLICMPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLICMPass());
}
void LLVMAddLoopDeletionPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLoopDeletionPass());
}
void LLVMAddLoopIdiomPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLoopIdiomPass());
}
void LLVMAddLoopRotatePass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLoopRotatePass());
}
void LLVMAddLoopRerollPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLoopRerollPass());
}
void LLVMAddLoopUnrollPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLoopUnrollPass());
}
void LLVMAddLoopUnrollAndJamPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLoopUnrollAndJamPass());
}
void LLVMAddLoopUnswitchPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLoopUnswitchPass());
}
void LLVMAddLowerAtomicPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLowerAtomicPass());
}
void LLVMAddMemCpyOptPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createMemCpyOptPass());
}
void LLVMAddPartiallyInlineLibCallsPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createPartiallyInlineLibCallsPass());
}
void LLVMAddReassociatePass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createReassociatePass());
}
void LLVMAddSCCPPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createSCCPPass());
}
void LLVMAddScalarReplAggregatesPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createSROAPass());
}
void LLVMAddScalarReplAggregatesPassSSA(LLVMPassManagerRef PM) {
unwrap(PM)->add(createSROAPass());
}
void LLVMAddScalarReplAggregatesPassWithThreshold(LLVMPassManagerRef PM,
int Threshold) {
unwrap(PM)->add(createSROAPass());
}
void LLVMAddSimplifyLibCallsPass(LLVMPassManagerRef PM) {
// NOTE: The simplify-libcalls pass has been removed.
}
void LLVMAddTailCallEliminationPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createTailCallEliminationPass());
}
void LLVMAddConstantPropagationPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createConstantPropagationPass());
}
void LLVMAddDemoteMemoryToRegisterPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createDemoteRegisterToMemoryPass());
}
void LLVMAddVerifierPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createVerifierPass());
}
void LLVMAddCorrelatedValuePropagationPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createCorrelatedValuePropagationPass());
}
void LLVMAddEarlyCSEPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createEarlyCSEPass(false/*=UseMemorySSA*/));
}
void LLVMAddEarlyCSEMemSSAPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createEarlyCSEPass(true/*=UseMemorySSA*/));
}
void LLVMAddGVNHoistLegacyPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createGVNHoistPass());
}
void LLVMAddTypeBasedAliasAnalysisPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createTypeBasedAAWrapperPass());
}
void LLVMAddScopedNoAliasAAPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createScopedNoAliasAAWrapperPass());
}
void LLVMAddBasicAliasAnalysisPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createBasicAAWrapperPass());
}
void LLVMAddLowerExpectIntrinsicPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createLowerExpectIntrinsicPass());
}
void LLVMAddUnifyFunctionExitNodesPass(LLVMPassManagerRef PM) {
unwrap(PM)->add(createUnifyFunctionExitNodesPass());
}