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Teach alias analysis about readnone/readonly functions.

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Based on a patch by Török Edwin.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44279 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2007-11-22 21:43:27 +00:00
parent 5ef7be79e0
commit 920653d41e
2 changed files with 39 additions and 0 deletions
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6
lib/Analysis/BasicAliasAnalysis.cpp
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@ -952,6 +952,12 @@ BasicAliasAnalysis::getModRefBehavior(Function *F, CallSite CS,
if (Ptr != OnlyReadsMemoryTable->end() && strcmp(*Ptr, NamePtr) == 0)
return OnlyReadsMemory;
const ParamAttrsList *Attrs = F->getFunctionType()->getParamAttrs();
if (Attrs && Attrs->paramHasAttr(0, ParamAttr::ReadNone))
return DoesNotAccessMemory;
if (Attrs && Attrs->paramHasAttr(0, ParamAttr::ReadOnly))
return OnlyReadsMemory;
return UnknownModRefBehavior;
}