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Allow SMUL_LOHI and UMUL_LOHI to be narrow to MUL on targets where MUL is Custom rather than Legal. Even if the target is doing some kind of expansion for MUL, it's pretty much guaranteed to be more efficent than whatever it does for SMUL_LOHI or UMUL_LOHI!

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llvm-svn: 199678
This commit is contained in:
Owen Anderson 2014-01-20 18:41:34 +00:00
parent b9023ed0f6
commit fb00d5bc7c
1 changed files with 1 additions and 1 deletions
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2
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2249,7 +2249,7 @@ SDValue DAGCombiner::SimplifyNodeWithTwoResults(SDNode *N, unsigned LoOp,
bool HiExists = N->hasAnyUseOfValue(1);
if (!HiExists &&
(!LegalOperations ||
TLI.isOperationLegal(LoOp, N->getValueType(0)))) {
TLI.isOperationLegalOrCustom(LoOp, N->getValueType(0)))) {
SDValue Res = DAG.getNode(LoOp, SDLoc(N), N->getValueType(0),
N->op_begin(), N->getNumOperands());
return CombineTo(N, Res, Res);