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013daef6ec
This patch moves some common utility functions out of IPSCCP and makes them available globally. The functions determine if interprocedural data-flow analyses can propagate information through function returns, arguments, and global variables. Differential Revision: https://reviews.llvm.org/D37638 llvm-svn: 315719
45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
//===-- ValueLatticeUtils.cpp - Utils for solving lattices ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements common functions useful for performing data-flow
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// analyses that propagate values across function boundaries.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/ValueLatticeUtils.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Instructions.h"
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using namespace llvm;
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bool llvm::canTrackArgumentsInterprocedurally(Function *F) {
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return F->hasLocalLinkage() && !F->hasAddressTaken();
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}
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bool llvm::canTrackReturnsInterprocedurally(Function *F) {
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return F->hasExactDefinition() && !F->hasFnAttribute(Attribute::Naked);
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}
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bool llvm::canTrackGlobalVariableInterprocedurally(GlobalVariable *GV) {
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if (GV->isConstant() || !GV->hasLocalLinkage() ||
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!GV->hasDefinitiveInitializer())
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return false;
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return !any_of(GV->users(), [&](User *U) {
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if (auto *Store = dyn_cast<StoreInst>(U)) {
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if (Store->getValueOperand() == GV || Store->isVolatile())
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return true;
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} else if (auto *Load = dyn_cast<LoadInst>(U)) {
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if (Load->isVolatile())
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return true;
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} else {
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return true;
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}
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return false;
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});
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}
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