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Use the AliasAnalysis interface to determine how a Function accesses

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memory. This isn't a real improvement with present day AliasAnalysis
implementations; it's mainly for consistency.

llvm-svn: 118624
This commit is contained in:
Dan Gohman 2010-11-09 20:13:27 +00:00
parent ebeb34d412
commit 4651780f86
1 changed files with 3 additions and 2 deletions
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5
lib/Transforms/IPO/FunctionAttrs.cpp
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@ -101,14 +101,15 @@ bool FunctionAttrs::AddReadAttrs(const CallGraphSCC &SCC) {
// External node - may write memory. Just give up.
return false;
if (F->doesNotAccessMemory())
AliasAnalysis::ModRefBehavior MRB = AA->getModRefBehavior(F);
if (MRB == AliasAnalysis::DoesNotAccessMemory)
// Already perfect!
continue;
// Definitions with weak linkage may be overridden at linktime with
// something that writes memory, so treat them like declarations.
if (F->isDeclaration() || F->mayBeOverridden()) {
if (!F->onlyReadsMemory())
if (!AliasAnalysis::onlyReadsMemory(MRB))
// May write memory. Just give up.
return false;