d9a4a24413
Summary: If an induction variable is frozen and used, SCEV yields imprecise result because it doesn't say anything about frozen variables. Due to this reason, performance degradation happened after https://reviews.llvm.org/D76483 is merged, causing SCEV yield imprecise result and preventing LSR to optimize a loop. The suggested solution here is to add a pass which canonicalizes frozen variables inside a loop. To be specific, it pushes freezes out of the loop by freezing the initial value and step values instead & dropping nsw/nuw flags from instructions used by freeze. This solution was also mentioned at https://reviews.llvm.org/D70623 . Reviewers: spatel, efriedma, lebedev.ri, fhahn, jdoerfert Reviewed By: fhahn Subscribers: nikic, mgorny, hiraditya, javed.absar, llvm-commits, sanwou01, nlopes Tags: #llvm Differential Revision: https://reviews.llvm.org/D77523
66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
//===-- Utils.cpp - TransformUtils Infrastructure -------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the common initialization infrastructure for the
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// TransformUtils library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils.h"
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#include "llvm-c/Initialization.h"
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#include "llvm-c/Transforms/Utils.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/PassRegistry.h"
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using namespace llvm;
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/// initializeTransformUtils - Initialize all passes in the TransformUtils
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/// library.
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void llvm::initializeTransformUtils(PassRegistry &Registry) {
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initializeAddDiscriminatorsLegacyPassPass(Registry);
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initializeAssumeSimplifyPassLegacyPassPass(Registry);
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initializeBreakCriticalEdgesPass(Registry);
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initializeCanonicalizeAliasesLegacyPassPass(Registry);
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initializeCanonicalizeFreezeInLoopsPass(Registry);
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initializeInstNamerPass(Registry);
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initializeLCSSAWrapperPassPass(Registry);
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initializeLibCallsShrinkWrapLegacyPassPass(Registry);
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initializeLoopSimplifyPass(Registry);
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initializeLowerInvokeLegacyPassPass(Registry);
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initializeLowerSwitchPass(Registry);
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initializeNameAnonGlobalLegacyPassPass(Registry);
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initializePromoteLegacyPassPass(Registry);
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initializeStripNonLineTableDebugInfoPass(Registry);
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initializeUnifyFunctionExitNodesPass(Registry);
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initializeMetaRenamerPass(Registry);
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initializeStripGCRelocatesPass(Registry);
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initializePredicateInfoPrinterLegacyPassPass(Registry);
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initializeInjectTLIMappingsLegacyPass(Registry);
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initializeFixIrreduciblePass(Registry);
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initializeUnifyLoopExitsPass(Registry);
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initializeUniqueInternalLinkageNamesLegacyPassPass(Registry);
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}
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/// LLVMInitializeTransformUtils - C binding for initializeTransformUtilsPasses.
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void LLVMInitializeTransformUtils(LLVMPassRegistryRef R) {
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initializeTransformUtils(*unwrap(R));
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}
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void LLVMAddLowerSwitchPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createLowerSwitchPass());
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}
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void LLVMAddPromoteMemoryToRegisterPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createPromoteMemoryToRegisterPass());
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}
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void LLVMAddAddDiscriminatorsPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createAddDiscriminatorsPass());
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}
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