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0062c013da
Summary: This is the first change to enable the TLI to be built per-function so that -fno-builtin* handling can be migrated to use function attributes. See discussion on D61634 for background. This is an enabler for fixing handling of these options for LTO, for example. This change should not affect behavior, as the provided function is not yet used to build a specifically per-function TLI, but rather enables that migration. Most of the changes were very mechanical, e.g. passing a Function to the legacy analysis pass's getTLI interface, or in Module level cases, adding a callback. This is similar to the way the per-function TTI analysis works. There was one place where we were looking for builtins but not in the context of a specific function. See FindCXAAtExit in lib/Transforms/IPO/GlobalOpt.cpp. I'm somewhat concerned my workaround could provide the wrong behavior in some corner cases. Suggestions welcome. Reviewers: chandlerc, hfinkel Subscribers: arsenm, dschuff, jvesely, nhaehnle, mehdi_amini, javed.absar, sbc100, jgravelle-google, eraman, aheejin, steven_wu, george.burgess.iv, dexonsmith, jfb, asbirlea, gchatelet, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D66428 llvm-svn: 371284
75 lines
2.9 KiB
C++
75 lines
2.9 KiB
C++
//===- LazyBranchProbabilityInfo.cpp - Lazy Branch Probability Analysis ---===//
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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 is an alternative analysis pass to BranchProbabilityInfoWrapperPass.
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// The difference is that with this pass the branch probabilities are not
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// computed when the analysis pass is executed but rather when the BPI results
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// is explicitly requested by the analysis client.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/LazyBranchProbabilityInfo.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/IR/Dominators.h"
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using namespace llvm;
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#define DEBUG_TYPE "lazy-branch-prob"
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INITIALIZE_PASS_BEGIN(LazyBranchProbabilityInfoPass, DEBUG_TYPE,
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"Lazy Branch Probability Analysis", true, true)
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INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
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INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
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INITIALIZE_PASS_END(LazyBranchProbabilityInfoPass, DEBUG_TYPE,
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"Lazy Branch Probability Analysis", true, true)
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char LazyBranchProbabilityInfoPass::ID = 0;
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LazyBranchProbabilityInfoPass::LazyBranchProbabilityInfoPass()
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: FunctionPass(ID) {
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initializeLazyBranchProbabilityInfoPassPass(*PassRegistry::getPassRegistry());
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}
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void LazyBranchProbabilityInfoPass::print(raw_ostream &OS,
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const Module *) const {
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LBPI->getCalculated().print(OS);
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}
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void LazyBranchProbabilityInfoPass::getAnalysisUsage(AnalysisUsage &AU) const {
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// We require DT so it's available when LI is available. The LI updating code
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// asserts that DT is also present so if we don't make sure that we have DT
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// here, that assert will trigger.
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AU.addRequired<DominatorTreeWrapperPass>();
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AU.addRequired<LoopInfoWrapperPass>();
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AU.addRequired<TargetLibraryInfoWrapperPass>();
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AU.setPreservesAll();
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}
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void LazyBranchProbabilityInfoPass::releaseMemory() { LBPI.reset(); }
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bool LazyBranchProbabilityInfoPass::runOnFunction(Function &F) {
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LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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TargetLibraryInfo &TLI =
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getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(F);
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LBPI = std::make_unique<LazyBranchProbabilityInfo>(&F, &LI, &TLI);
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return false;
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}
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void LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage(AnalysisUsage &AU) {
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AU.addRequired<LazyBranchProbabilityInfoPass>();
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AU.addRequired<LoopInfoWrapperPass>();
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AU.addRequired<TargetLibraryInfoWrapperPass>();
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}
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void llvm::initializeLazyBPIPassPass(PassRegistry &Registry) {
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INITIALIZE_PASS_DEPENDENCY(LazyBranchProbabilityInfoPass);
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INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass);
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INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass);
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}
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