6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
40 lines
1.5 KiB
C++
40 lines
1.5 KiB
C++
//===- LoopSink.h - Loop Sink Pass ------------------------------*- C++ -*-===//
|
|
//
|
|
// 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 provides the interface for the Loop Sink pass.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_TRANSFORMS_SCALAR_LOOPSINK_H
|
|
#define LLVM_TRANSFORMS_SCALAR_LOOPSINK_H
|
|
|
|
#include "llvm/IR/PassManager.h"
|
|
|
|
namespace llvm {
|
|
|
|
class Function;
|
|
|
|
/// A pass that does profile-guided sinking of instructions into loops.
|
|
///
|
|
/// This is a function pass as it shouldn't be composed into any kind of
|
|
/// unified loop pass pipeline. The goal of it is to sink code into loops that
|
|
/// is loop invariant but only required within the loop body when doing so
|
|
/// reduces the global expected dynamic frequency with which it executes.
|
|
/// A classic example is an extremely cold branch within a loop body.
|
|
///
|
|
/// We do this as a separate pass so that during normal optimization all
|
|
/// invariant operations can be held outside the loop body to simplify
|
|
/// fundamental analyses and transforms of the loop.
|
|
class LoopSinkPass : public PassInfoMixin<LoopSinkPass> {
|
|
public:
|
|
PreservedAnalyses run(Function &F, FunctionAnalysisManager &FAM);
|
|
};
|
|
}
|
|
|
|
#endif // LLVM_TRANSFORMS_SCALAR_LOOPSINK_H
|