[llvm] [DAG] Matched FixedWidth pattern for ISD::AVGFLOORU (PR #84903)

[Jay Foad via llvm-commits]

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@@ -2821,6 +2821,47 @@ SDValue DAGCombiner::visitADDLike(SDNode *N) {
   return SDValue();
 }
 
+// Attempt to form avgflooru(A, B) from add(and(A, B), lshr(xor(A, B), 1))
+static SDValue combineFixedwidthToAVGFLOORU(SDNode *N, SelectionDAG &DAG) {
+  assert(N->getOpcode() == ISD::ADD and "ADD node is required here");
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jayfoad wrote:

Please use `&&` instead of `and` (and similar) throughout your code!

https://github.com/llvm/llvm-project/pull/84903