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[DAG] Defer Pre/Post IndexStore merge to after mergestore. NFCI.

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In preparation for doing storemerge post-legalization, reorder
visitSTORE passes to move pre/post-index combining after store
merge. Reordered passes other than store merge are unaffected.

llvm-svn: 305473
This commit is contained in:
Nirav Dave 2017-06-15 15:05:48 +00:00
parent c66e7ebfbd
commit ba6db6fbfd
1 changed files with 4 additions and 4 deletions
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8
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -13218,10 +13218,6 @@ SDValue DAGCombiner::visitSTORE(SDNode *N) {
Chain = ST->getChain();
}
// Try transforming N to an indexed store.
if (CombineToPreIndexedLoadStore(N) || CombineToPostIndexedLoadStore(N))
return SDValue(N, 0);
// FIXME: is there such a thing as a truncating indexed store?
if (ST->isTruncatingStore() && ST->isUnindexed() &&
Value.getValueType().isInteger()) {
@ -13316,6 +13312,10 @@ SDValue DAGCombiner::visitSTORE(SDNode *N) {
}
}
// Try transforming N to an indexed store.
if (CombineToPreIndexedLoadStore(N) || CombineToPostIndexedLoadStore(N))
return SDValue(N, 0);
// Turn 'store float 1.0, Ptr' -> 'store int 0x12345678, Ptr'
//
// Make sure to do this only after attempting to merge stores in order to