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This file lists every pass in LLVM, and is included by Pass.h, which is very popular. Every time we add, remove, or rename a pass in LLVM, it caused lots of recompilation. I found this fact by looking at this table, which is sorted by the number of times a file was changed over the last 100,000 git commits multiplied by the number of object files that depend on it in the current checkout: recompiles touches affected_files header 342380 95 3604 llvm/include/llvm/ADT/STLExtras.h 314730 234 1345 llvm/include/llvm/InitializePasses.h 307036 118 2602 llvm/include/llvm/ADT/APInt.h 213049 59 3611 llvm/include/llvm/Support/MathExtras.h 170422 47 3626 llvm/include/llvm/Support/Compiler.h 162225 45 3605 llvm/include/llvm/ADT/Optional.h 158319 63 2513 llvm/include/llvm/ADT/Triple.h 140322 39 3598 llvm/include/llvm/ADT/StringRef.h 137647 59 2333 llvm/include/llvm/Support/Error.h 131619 73 1803 llvm/include/llvm/Support/FileSystem.h Before this change, touching InitializePasses.h would cause 1345 files to recompile. After this change, touching it only causes 550 compiles in an incremental rebuild. Reviewers: bkramer, asbirlea, bollu, jdoerfert Differential Revision: https://reviews.llvm.org/D70211
71 lines
2.3 KiB
C++
71 lines
2.3 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/Transforms/InstCombine/InstCombineWorklist.h"
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namespace llvm {
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class InstCombinePass : public PassInfoMixin<InstCombinePass> {
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InstCombineWorklist Worklist;
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bool ExpensiveCombines;
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public:
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static StringRef name() { return "InstCombinePass"; }
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explicit InstCombinePass(bool ExpensiveCombines = true)
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: ExpensiveCombines(ExpensiveCombines) {}
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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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InstCombineWorklist Worklist;
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const bool ExpensiveCombines;
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public:
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static char ID; // Pass identification, replacement for typeid
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InstructionCombiningPass(bool ExpensiveCombines = true);
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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(bool ExpensiveCombines = true);
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}
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#endif
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