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7716d65968
Summary: Enable some of the existing size optimizations for cold code under PGO. A ~5% code size saving in big internal app under PGO. The way it gets BFI/PSI is discussed in the RFC thread http://lists.llvm.org/pipermail/llvm-dev/2019-March/130894.html Note it doesn't currently touch loop passes. Reviewers: davidxl, eraman Reviewed By: eraman Subscribers: mgorny, javed.absar, smeenai, mehdi_amini, eraman, zzheng, steven_wu, dexonsmith, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59514 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358422 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
1.4 KiB
C++
38 lines
1.4 KiB
C++
//===-- SizeOpts.cpp - code size optimization related code ----------------===//
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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 contains some shared code size optimization related code.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/BlockFrequencyInfo.h"
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#include "llvm/Analysis/ProfileSummaryInfo.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Transforms/Utils/SizeOpts.h"
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using namespace llvm;
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static cl::opt<bool> ProfileGuidedSizeOpt(
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"pgso", cl::Hidden, cl::init(true),
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cl::desc("Enable the profile guided size optimization. "));
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bool llvm::shouldOptimizeForSize(Function *F, ProfileSummaryInfo *PSI,
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BlockFrequencyInfo *BFI) {
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assert(F);
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if (!PSI || !BFI || !PSI->hasProfileSummary())
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return false;
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return ProfileGuidedSizeOpt && PSI->isFunctionColdInCallGraph(F, *BFI);
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}
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bool llvm::shouldOptimizeForSize(BasicBlock *BB, ProfileSummaryInfo *PSI,
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BlockFrequencyInfo *BFI) {
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assert(BB);
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if (!PSI || !BFI || !PSI->hasProfileSummary())
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return false;
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return ProfileGuidedSizeOpt && PSI->isColdBlock(BB, BFI);
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}
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