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Don't DSe volatile stores.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41456 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2007-08-26 21:14:47 +00:00
parent e6c1742914
commit 5dfcf4318a
1 changed files with 25 additions and 18 deletions
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9
lib/Transforms/Scalar/DeadStoreElimination.cpp
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@@ -111,9 +111,12 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
continue;
Value* pointer = 0;
if (StoreInst* S = dyn_cast<StoreInst>(BBI))
if (StoreInst* S = dyn_cast<StoreInst>(BBI)) {
if (!S->isVolatile())
pointer = S->getPointerOperand();
else
continue;
} else
pointer = cast<FreeInst>(BBI)->getPointerOperand();
StoreInst*& last = lastStore[pointer];
@@ -194,6 +197,8 @@ bool DSE::handleFreeWithNonTrivialDependency(FreeInst* F, Instruction* dep,
StoreInst* dependency = dyn_cast<StoreInst>(dep);
if (!dependency)
return false;
else if (dependency->isVolatile())
return false;
Value* depPointer = dependency->getPointerOperand();
const Type* depType = dependency->getOperand(0)->getType();
@@ -253,6 +258,7 @@ bool DSE::handleEndBlock(BasicBlock& BB,
// If we find a store whose pointer is dead...
if (StoreInst* S = dyn_cast<StoreInst>(BBI)) {
if (!S->isVolatile()) {
Value* pointerOperand = S->getPointerOperand();
// See through pointer-to-pointer bitcasts
TranslatePointerBitCasts(pointerOperand);
@@ -272,6 +278,7 @@ bool DSE::handleEndBlock(BasicBlock& BB,
NumFastStores++;
MadeChange = true;
}
}
continue;
}