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b4d5045713
For each natural loop with multiple exit blocks, this pass creates a new block N such that all exiting blocks now branch to N, and then control flow is redistributed to all the original exit blocks. The bulk of the tranformation is a new function introduced in BasicBlockUtils that an redirect control flow from a set of incoming blocks to a set of outgoing blocks via a common "hub". This is a useful workaround for a limitation in the structurizer which incorrectly orders blocks when processing a nest of loops. This pass bypasses that issue by ensuring that each natural loop is recognized as a separate region. Since the structurizer is a region pass, it no longer sees a nest of loops in a single region, and instead processes each "level" in the nesting as a separate region. The AMDGPU backend provides a new option to enable this pass before the structurizer, which may eventually be enabled by default. Reviewers: madhur13490, arsenm, nhaehnle Reviewed By: nhaehnle Differential Revision: https://reviews.llvm.org/D75865
62 lines
2.3 KiB
C++
62 lines
2.3 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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initializeBreakCriticalEdgesPass(Registry);
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initializeCanonicalizeAliasesLegacyPassPass(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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initializeUnifyLoopExitsPass(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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