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Add helper functions for computing the Location of load, store,

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and vaarg instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118845 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-11-11 21:50:19 +00:00
parent ef5b390263
commit 6d8eb156e6
8 changed files with 43 additions and 66 deletions
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33
lib/Analysis/AliasAnalysis.cpp
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@@ -194,6 +194,24 @@ AliasAnalysis::getModRefBehavior(const Function *F) {
// AliasAnalysis non-virtual helper method implementation
//===----------------------------------------------------------------------===//
AliasAnalysis::Location AliasAnalysis::getLocation(const LoadInst *LI) {
return Location(LI->getPointerOperand(),
getTypeStoreSize(LI->getType()),
LI->getMetadata(LLVMContext::MD_tbaa));
}
AliasAnalysis::Location AliasAnalysis::getLocation(const StoreInst *SI) {
return Location(SI->getPointerOperand(),
getTypeStoreSize(SI->getValueOperand()->getType()),
SI->getMetadata(LLVMContext::MD_tbaa));
}
AliasAnalysis::Location AliasAnalysis::getLocation(const VAArgInst *VI) {
return Location(VI->getPointerOperand(),
UnknownSize,
VI->getMetadata(LLVMContext::MD_tbaa));
}
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(const LoadInst *L, const Location &Loc) {
// Be conservative in the face of volatile.
@@ -202,10 +220,7 @@ AliasAnalysis::getModRefInfo(const LoadInst *L, const Location &Loc) {
// If the load address doesn't alias the given address, it doesn't read
// or write the specified memory.
if (!alias(Location(L->getOperand(0),
getTypeStoreSize(L->getType()),
L->getMetadata(LLVMContext::MD_tbaa)),
Loc))
if (!alias(getLocation(L), Loc))
return NoModRef;
// Otherwise, a load just reads.
@@ -220,10 +235,7 @@ AliasAnalysis::getModRefInfo(const StoreInst *S, const Location &Loc) {
// If the store address cannot alias the pointer in question, then the
// specified memory cannot be modified by the store.
if (!alias(Location(S->getOperand(1),
getTypeStoreSize(S->getOperand(0)->getType()),
S->getMetadata(LLVMContext::MD_tbaa)),
Loc))
if (!alias(getLocation(S), Loc))
return NoModRef;
// If the pointer is a pointer to constant memory, then it could not have been
@@ -239,10 +251,7 @@ AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(const VAArgInst *V, const Location &Loc) {
// If the va_arg address cannot alias the pointer in question, then the
// specified memory cannot be accessed by the va_arg.
if (!alias(Location(V->getOperand(0),
UnknownSize,
V->getMetadata(LLVMContext::MD_tbaa)),
Loc))
if (!alias(getLocation(V), Loc))
return NoModRef;
// If the pointer is a pointer to constant memory, then it could not have been