diff options
| author | Duncan Sands <baldrick@free.fr> | 2007-11-22 21:43:27 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2007-11-22 21:43:27 +0000 |
| commit | 920653d41e101787cad4b733ae5c3d4241aa0cec (patch) | |
| tree | 5fcaa80255be792695576f027280ce5d9ad1b2aa /lib/Analysis/BasicAliasAnalysis.cpp | |
| parent | 5ef7be79e0a9e2c05f84e2a98b6969dcabebf15d (diff) | |
Teach alias analysis about readnone/readonly functions.
Based on a patch by Török Edwin.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44279 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/BasicAliasAnalysis.cpp')
| -rw-r--r-- | lib/Analysis/BasicAliasAnalysis.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp index cbbc530fef..c6e34da5ac 100644 --- a/lib/Analysis/BasicAliasAnalysis.cpp +++ b/lib/Analysis/BasicAliasAnalysis.cpp @@ -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; } |