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Teach BasicAA a little something about the atomic intrinsics: they can only

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modify through the pointer they're given.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83959 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-10-13 07:48:38 +00:00
parent cc271861da
commit 5c9be67cff
2 changed files with 37 additions and 0 deletions
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21
lib/Analysis/BasicAliasAnalysis.cpp
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@@ -284,6 +284,27 @@ BasicAliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
if (!passedAsArg)
return NoModRef;
}
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(CS.getInstruction())) {
switch (II->getIntrinsicID()) {
default: break;
case Intrinsic::atomic_cmp_swap:
case Intrinsic::atomic_swap:
case Intrinsic::atomic_load_add:
case Intrinsic::atomic_load_sub:
case Intrinsic::atomic_load_and:
case Intrinsic::atomic_load_nand:
case Intrinsic::atomic_load_or:
case Intrinsic::atomic_load_xor:
case Intrinsic::atomic_load_max:
case Intrinsic::atomic_load_min:
case Intrinsic::atomic_load_umax:
case Intrinsic::atomic_load_umin:
if (alias(II->getOperand(1), Size, P, Size) == NoAlias)
return NoModRef;
break;
}
}
}
// The AliasAnalysis base class has some smarts, lets use them.