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Tidy up after truncstore changes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30961 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey 2006-10-14 12:14:27 +00:00
parent f6774c7ec1
commit d4edf2cf91
1 changed files with 9 additions and 46 deletions
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55
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2743,50 +2743,6 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
SDOperand Value = ST->getValue();
SDOperand Ptr = ST->getBasePtr();
// FIXME - Switch over after StoreSDNode comes online.
if (ST->isTruncatingStore()) {
if (CombinerAA) {
// Walk up chain skipping non-aliasing memory nodes.
SDOperand BetterChain = FindBetterChain(N, Chain);
// If there is a better chain.
if (Chain != BetterChain) {
// Replace the chain to avoid dependency.
SDOperand ReplTStore =
DAG.getTruncStore(BetterChain, Value, Ptr, ST->getSrcValue(),
ST->getSrcValueOffset(), ST->getStoredVT());
// Create token to keep both nodes around.
SDOperand Token =
DAG.getNode(ISD::TokenFactor, MVT::Other, Chain, ReplTStore);
// Don't add users to work list.
return CombineTo(N, Token, false);
}
}
return SDOperand();
}
// If this is a store that kills a previous store, remove the previous store.
if (ISD::isNON_TRUNCStore(Chain.Val)) {
StoreSDNode *PrevST = cast<StoreSDNode>(Chain);
if (PrevST->getBasePtr() == Ptr &&
Chain.Val->hasOneUse() /* Avoid introducing DAG cycles */ &&
// Make sure that these stores are the same value type:
// FIXME: we really care that the second store is >= size of the first.
Value.getValueType() == PrevST->getValue().getValueType()) {
// Create a new store of Value that replaces both stores.
if (PrevST->getValue() == Value) // Same value multiply stored.
return Chain;
SDOperand NewStore = DAG.getStore(PrevST->getChain(), Value, Ptr,
ST->getSrcValue(), ST->getSrcValueOffset());
CombineTo(N, NewStore); // Nuke this store.
CombineTo(Chain.Val, NewStore); // Nuke the previous store.
return SDOperand(N, 0);
}
}
// If this is a store of a bit convert, store the input value.
// FIXME: This needs to know that the resultant store does not need a
// higher alignment than the original.
@ -2809,8 +2765,15 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
// If there is a better chain.
if (Chain != BetterChain) {
// Replace the chain to avoid dependency.
SDOperand ReplStore = DAG.getStore(BetterChain, Value, Ptr,
ST->getSrcValue(), ST->getSrcValueOffset());
SDOperand ReplStore;
if (ST->isTruncatingStore()) {
ReplStore = DAG.getTruncStore(BetterChain, Value, Ptr,
ST->getSrcValue(),ST->getSrcValueOffset(), ST->getStoredVT());
} else {
ReplStore = DAG.getStore(BetterChain, Value, Ptr,
ST->getSrcValue(), ST->getSrcValueOffset());
}
// Create token to keep both nodes around.
SDOperand Token =
DAG.getNode(ISD::TokenFactor, MVT::Other, Chain, ReplStore);