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use the new isNoAlias method to simplify some code, only do an escaping check if

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we have a non-constant pointer.  Constant pointers can't be local.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89665 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-11-23 16:46:41 +00:00
parent 5d56b2d47d
commit 403ac2ece3
2 changed files with 17 additions and 13 deletions
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7
lib/Analysis/AliasAnalysis.cpp
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@ -127,17 +127,18 @@ AliasAnalysis::getModRefBehavior(Function *F,
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
ModRefResult Mask = ModRef;
ModRefBehavior MRB = getModRefBehavior(CS);
if (MRB == DoesNotAccessMemory)
return NoModRef;
else if (MRB == OnlyReadsMemory)
ModRefResult Mask = ModRef;
if (MRB == OnlyReadsMemory)
Mask = Ref;
else if (MRB == AliasAnalysis::AccessesArguments) {
bool doesAlias = false;
for (CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
AI != AE; ++AI)
if (alias(*AI, ~0U, P, Size) != NoAlias) {
if (!isNoAlias(*AI, ~0U, P, Size)) {
doesAlias = true;
break;
}