Allow SMUL_LOHI and UMUL_LOHI to be narrow to MUL on targets where MU…

…L 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! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199678 91177308-0d34-0410-b5e6-96231b3b80d8
xdress · Jan 20, 2014 · daa4c91 · daa4c91
1 parent 61a7bb0
commit daa4c91
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -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);