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Add argmemonly attribute.

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This change adds new attribute called "argmemonly". Function marked with this attribute can only access memory through it's argument pointers. This attribute directly corresponds to the "OnlyAccessesArgumentPointees" ModRef behaviour in alias analysis.

Differential Revision: http://reviews.llvm.org/D10398



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241979 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Igor Laevsky
2015-07-11 10:30:36 +00:00
parent 063b6a0120
commit 6690dbffe0
17 changed files with 167 additions and 35 deletions
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6
lib/Analysis/BasicAliasAnalysis.cpp
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@@ -685,6 +685,9 @@ BasicAliasAnalysis::getModRefBehavior(ImmutableCallSite CS) {
if (CS.onlyReadsMemory())
Min = OnlyReadsMemory;
if (CS.onlyAccessesArgMemory())
Min = ModRefBehavior(Min & OnlyAccessesArgumentPointees);
// The AliasAnalysis base class has some smarts, lets use them.
return ModRefBehavior(AliasAnalysis::getModRefBehavior(CS) & Min);
}
@@ -710,6 +713,9 @@ BasicAliasAnalysis::getModRefBehavior(const Function *F) {
if (F->onlyReadsMemory())
Min = OnlyReadsMemory;
if (F->onlyAccessesArgMemory())
Min = ModRefBehavior(Min & OnlyAccessesArgumentPointees);
const TargetLibraryInfo &TLI =
getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
if (isMemsetPattern16(F, TLI))