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Enhance alias analysis for atomic instructions a bit. Upgrade a couple alias-analysis tests to the new atomic instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140557 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-09-26 20:15:28 +00:00
parent 22d54da918
commit 46cb5afdcd
4 changed files with 46 additions and 14 deletions
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40
lib/Analysis/AliasAnalysis.cpp
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@@ -237,6 +237,19 @@ AliasAnalysis::Location AliasAnalysis::getLocation(const VAArgInst *VI) {
VI->getMetadata(LLVMContext::MD_tbaa));
}
AliasAnalysis::Location
AliasAnalysis::getLocation(const AtomicCmpXchgInst *CXI) {
return Location(CXI->getPointerOperand(),
getTypeStoreSize(CXI->getCompareOperand()->getType()),
CXI->getMetadata(LLVMContext::MD_tbaa));
}
AliasAnalysis::Location
AliasAnalysis::getLocation(const AtomicRMWInst *RMWI) {
return Location(RMWI->getPointerOperand(),
getTypeStoreSize(RMWI->getValOperand()->getType()),
RMWI->getMetadata(LLVMContext::MD_tbaa));
}
AliasAnalysis::Location
AliasAnalysis::getLocationForSource(const MemTransferInst *MTI) {
@@ -317,6 +330,33 @@ AliasAnalysis::getModRefInfo(const VAArgInst *V, const Location &Loc) {
return ModRef;
}
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(const AtomicCmpXchgInst *CX, const Location &Loc) {
// Acquire/Release cmpxchg has properties that matter for arbitrary addresses.
if (CX->getOrdering() > Monotonic)
return ModRef;
// If the cmpxchg address does not alias the location, it does not access it.
if (!alias(getLocation(CX), Loc))
return NoModRef;
return ModRef;
}
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(const AtomicRMWInst *RMW, const Location &Loc) {
// Acquire/Release atomicrmw has properties that matter for arbitrary addresses.
if (RMW->getOrdering() > Monotonic)
return ModRef;
// If the atomicrmw address does not alias the location, it does not access it.
if (!alias(getLocation(RMW), Loc))
return NoModRef;
return ModRef;
}
// AliasAnalysis destructor: DO NOT move this to the header file for
// AliasAnalysis or else clients of the AliasAnalysis class may not depend on
// the AliasAnalysis.o file in the current .a file, causing alias analysis