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Teach BasicAliasAnalysis::getModRefBehavior(const Function *F)

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to analyze intrinsic functions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118409 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-11-08 16:08:43 +00:00
parent 6c25c920e6
commit 431c794ade
1 changed files with 11 additions and 3 deletions
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14
lib/Analysis/BasicAliasAnalysis.cpp
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@ -553,14 +553,22 @@ BasicAliasAnalysis::getModRefBehavior(ImmutableCallSite CS) {
/// For use when the call site is not known.
AliasAnalysis::ModRefBehavior
BasicAliasAnalysis::getModRefBehavior(const Function *F) {
// If the function declares it doesn't access memory, we can't do better.
if (F->doesNotAccessMemory())
// Can't do better than this.
return DoesNotAccessMemory;
// For intrinsics, we can check the table.
if (unsigned iid = F->getIntrinsicID()) {
#define GET_INTRINSIC_MODREF_BEHAVIOR
#include "llvm/Intrinsics.gen"
#undef GET_INTRINSIC_MODREF_BEHAVIOR
}
// If the function declares it only reads memory, go with that.
if (F->onlyReadsMemory())
return OnlyReadsMemory;
if (unsigned id = F->getIntrinsicID())
return getIntrinsicModRefBehavior(id);
// Otherwise be conservative.
return AliasAnalysis::getModRefBehavior(F);
}