6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
101 lines
2.9 KiB
C++
101 lines
2.9 KiB
C++
//===- InstCombine.h - InstCombine pass -------------------------*- C++ -*-===//
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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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/// \file
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///
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/// This file provides the primary interface to the instcombine pass. This pass
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/// is suitable for use in the new pass manager. For a pass that works with the
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/// legacy pass manager, use \c createInstructionCombiningPass().
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_INSTCOMBINE_INSTCOMBINE_H
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#define LLVM_TRANSFORMS_INSTCOMBINE_INSTCOMBINE_H
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#include "llvm/IR/Function.h"
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#include "llvm/IR/PassManager.h"
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#include "llvm/Pass.h"
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#define DEBUG_TYPE "instcombine"
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#include "llvm/Transforms/Utils/InstructionWorklist.h"
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namespace llvm {
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static constexpr unsigned InstCombineDefaultMaxIterations = 1;
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struct InstCombineOptions {
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bool UseLoopInfo = false;
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// Verify that a fix point has been reached after MaxIterations.
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bool VerifyFixpoint = false;
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unsigned MaxIterations = InstCombineDefaultMaxIterations;
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InstCombineOptions() = default;
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InstCombineOptions &setUseLoopInfo(bool Value) {
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UseLoopInfo = Value;
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return *this;
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}
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InstCombineOptions &setVerifyFixpoint(bool Value) {
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VerifyFixpoint = Value;
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return *this;
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}
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InstCombineOptions &setMaxIterations(unsigned Value) {
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MaxIterations = Value;
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return *this;
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}
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};
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class InstCombinePass : public PassInfoMixin<InstCombinePass> {
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private:
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InstructionWorklist Worklist;
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InstCombineOptions Options;
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public:
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explicit InstCombinePass(InstCombineOptions Opts = {});
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void printPipeline(raw_ostream &OS,
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function_ref<StringRef(StringRef)> MapClassName2PassName);
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PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
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};
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/// The legacy pass manager's instcombine pass.
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///
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/// This is a basic whole-function wrapper around the instcombine utility. It
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/// will try to combine all instructions in the function.
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class InstructionCombiningPass : public FunctionPass {
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InstructionWorklist Worklist;
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public:
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static char ID; // Pass identification, replacement for typeid
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explicit InstructionCombiningPass();
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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bool runOnFunction(Function &F) override;
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};
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//===----------------------------------------------------------------------===//
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//
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// InstructionCombining - Combine instructions to form fewer, simple
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// instructions. This pass does not modify the CFG, and has a tendency to make
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// instructions dead, so a subsequent DCE pass is useful.
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//
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// This pass combines things like:
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// %Y = add int 1, %X
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// %Z = add int 1, %Y
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// into:
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// %Z = add int 2, %X
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//
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FunctionPass *createInstructionCombiningPass();
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}
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#undef DEBUG_TYPE
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#endif
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