diff options
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index a8ae5e8065f..2170670a0b6 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -3103,15 +3103,14 @@ SDValue DAGCombiner::visitMULHS(SDNode *N) { if (isNullConstant(N1)) return N1; // fold (mulhs x, 1) -> (sra x, size(x)-1) - if (isOneConstant(N1)) { - SDLoc DL(N); + if (isOneConstant(N1)) return DAG.getNode(ISD::SRA, DL, N0.getValueType(), N0, DAG.getConstant(N0.getValueSizeInBits() - 1, DL, getShiftAmountTy(N0.getValueType()))); - } + // fold (mulhs x, undef) -> 0 if (N0.isUndef() || N1.isUndef()) - return DAG.getConstant(0, SDLoc(N), VT); + return DAG.getConstant(0, DL, VT); // If the type twice as wide is legal, transform the mulhs to a wider multiply // plus a shift. |
