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Fix DSE to not nuke dead stores unless they redundant store is the same
VT as the killing one. Fix fixes PR491 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24034 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1976,7 +1976,10 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
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// If this is a store that kills a previous store, remove the previous store.
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if (Chain.getOpcode() == ISD::STORE && Chain.getOperand(2) == Ptr &&
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Chain.Val->hasOneUse() /* Avoid introducing DAG cycles */) {
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Chain.Val->hasOneUse() /* Avoid introducing DAG cycles */ &&
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// Make sure that these stores are the same value type:
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// FIXME: we really care that the second store is >= size of the first.
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Value.getValueType() == Chain.getOperand(1).getValueType()) {
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// Create a new store of Value that replaces both stores.
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SDNode *PrevStore = Chain.Val;
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if (PrevStore->getOperand(1) == Value) // Same value multiply stored.
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