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don't bother touching volatile stores, they will just return clobber on

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everything interesting anyway.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60640 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-12-07 00:25:15 +00:00
parent 84b9a56d11
commit f760be1c7f
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/Scalar/DeadStoreElimination.cpp
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@ -91,6 +91,11 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
if (!isa<StoreInst>(Inst) && !isa<FreeInst>(Inst)) if (!isa<StoreInst>(Inst) && !isa<FreeInst>(Inst))
continue; continue;
// Don't molest volatile stores or do queries that will return "clobber".
if (StoreInst *SI = dyn_cast<StoreInst>(Inst))
if (SI->isVolatile())
continue;
MemDepResult InstDep = MD.getDependency(Inst); MemDepResult InstDep = MD.getDependency(Inst);
// Ignore non-local stores. // Ignore non-local stores.