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Enhance LICM to promote alias sets whose pointers themselves are stored,

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which doesn't affect the memory address being promoted.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122172 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-12-19 05:57:25 +00:00
parent 1c0af0ed25
commit 1dec0d2704
2 changed files with 34 additions and 1 deletions
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5
lib/Transforms/Scalar/LICM.cpp
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@@ -691,7 +691,10 @@ void LICM::PromoteAliasSet(AliasSet &AS) {
if (isa<LoadInst>(Use))
assert(!cast<LoadInst>(Use)->isVolatile() && "AST broken");
else if (isa<StoreInst>(Use)) {
if (Use->getOperand(0) == ASIV) return;
// Stores *of* the pointer are not interesting, only stores *to* the
// pointer.
if (Use->getOperand(1) != ASIV)
continue;
assert(!cast<StoreInst>(Use)->isVolatile() && "AST broken");
} else
return; // Not a load or store.