[X86] combineAnd - limit and(extract_vector_elt(shuffle(x)) -> extrac…

…t_vector_elt(shuffle'(x)) fold to one use of the extract_vector_elt. Prevents a regression in an upcoming patch.
llvm · Aug 3, 2023 · 4dcf687 · 4dcf687
1 parent 7f9b94c
commit 4dcf687
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -48370,7 +48370,7 @@ static SDValue combineAnd(SDNode *N, SelectionDAG &DAG,
   // Attempt to combine a scalar bitmask AND with an extracted shuffle.
   if ((VT.getScalarSizeInBits() % 8) == 0 &&
       N0.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
-      isa<ConstantSDNode>(N0.getOperand(1))) {
+      isa<ConstantSDNode>(N0.getOperand(1)) && N0->hasOneUse()) {
     SDValue BitMask = N1;
     SDValue SrcVec = N0.getOperand(0);
     EVT SrcVecVT = SrcVec.getValueType();