98 lines
3.3 KiB
PHP
98 lines
3.3 KiB
PHP
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//=== ValueProfilePlugins.inc - set of plugins used by ValueProfileCollector =//
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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 a set of plugin classes used in ValueProfileCollectorImpl.
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// Each plugin is responsible for collecting Value Profiling candidates for a
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// particular optimization.
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// Each plugin must satisfy the interface described in ValueProfileCollector.cpp
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//
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//===----------------------------------------------------------------------===//
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#include "ValueProfileCollector.h"
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#include "llvm/Analysis/IndirectCallVisitor.h"
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#include "llvm/IR/InstVisitor.h"
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using namespace llvm;
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using CandidateInfo = ValueProfileCollector::CandidateInfo;
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extern cl::opt<bool> MemOPOptMemcmpBcmp;
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///--------------------------- MemIntrinsicPlugin ------------------------------
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class MemIntrinsicPlugin : public InstVisitor<MemIntrinsicPlugin> {
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Function &F;
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TargetLibraryInfo &TLI;
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std::vector<CandidateInfo> *Candidates;
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public:
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static constexpr InstrProfValueKind Kind = IPVK_MemOPSize;
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MemIntrinsicPlugin(Function &Fn, TargetLibraryInfo &TLI)
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: F(Fn), TLI(TLI), Candidates(nullptr) {}
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void run(std::vector<CandidateInfo> &Cs) {
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Candidates = &Cs;
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visit(F);
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Candidates = nullptr;
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}
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void visitMemIntrinsic(MemIntrinsic &MI) {
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Value *Length = MI.getLength();
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// Not instrument constant length calls.
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if (dyn_cast<ConstantInt>(Length))
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return;
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Instruction *InsertPt = &MI;
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Instruction *AnnotatedInst = &MI;
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Candidates->emplace_back(CandidateInfo{Length, InsertPt, AnnotatedInst});
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}
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void visitCallInst(CallInst &CI) {
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if (!MemOPOptMemcmpBcmp)
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return;
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auto *F = CI.getCalledFunction();
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if (!F)
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return;
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LibFunc Func;
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if (TLI.getLibFunc(CI, Func) &&
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(Func == LibFunc_memcmp || Func == LibFunc_bcmp)) {
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Value *Length = CI.getArgOperand(2);
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// Not instrument constant length calls.
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if (dyn_cast<ConstantInt>(Length))
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return;
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Instruction *InsertPt = &CI;
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Instruction *AnnotatedInst = &CI;
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Candidates->emplace_back(CandidateInfo{Length, InsertPt, AnnotatedInst});
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}
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}
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};
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///------------------------ IndirectCallPromotionPlugin ------------------------
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class IndirectCallPromotionPlugin {
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Function &F;
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public:
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static constexpr InstrProfValueKind Kind = IPVK_IndirectCallTarget;
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IndirectCallPromotionPlugin(Function &Fn, TargetLibraryInfo &TLI) : F(Fn) {}
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void run(std::vector<CandidateInfo> &Candidates) {
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std::vector<CallBase *> Result = findIndirectCalls(F);
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for (Instruction *I : Result) {
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Value *Callee = cast<CallBase>(I)->getCalledOperand();
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Instruction *InsertPt = I;
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Instruction *AnnotatedInst = I;
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Candidates.emplace_back(CandidateInfo{Callee, InsertPt, AnnotatedInst});
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}
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}
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};
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///----------------------- Registration of the plugins -------------------------
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/// For now, registering a plugin with the ValueProfileCollector is done by
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/// adding the plugin type to the VP_PLUGIN_LIST macro.
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#define VP_PLUGIN_LIST \
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MemIntrinsicPlugin, \
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IndirectCallPromotionPlugin
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