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Add new getModRefInfo API to determine whether an Instruction and a call modify the same memory

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234814 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Berlin
2015-04-13 23:25:41 +00:00
parent e7122e58a1
commit 1f13e20f7d
2 changed files with 21 additions and 0 deletions
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17
lib/Analysis/AliasAnalysis.cpp
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@ -82,6 +82,23 @@ void AliasAnalysis::addEscapingUse(Use &U) {
AA->addEscapingUse(U);
}
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(Instruction *I, ImmutableCallSite Call) {
// We may have two calls
if (auto CS = ImmutableCallSite(I)) {
// Check if the two calls modify the same memory
return getModRefInfo(Call, CS);
} else {
// Otherwise, check if the call modifies or references the
// location this memory access defines. The best we can say
// is that if the call references what this instruction
// defines, it must be clobbered by this location.
const AliasAnalysis::Location DefLoc = AA->getLocation(I);
if (getModRefInfo(Call, DefLoc) != AliasAnalysis::NoModRef)
return AliasAnalysis::ModRef;
}
return AliasAnalysis::NoModRef;
}
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(ImmutableCallSite CS,