[DAGCombiner] Strip outer match in visitBITREVERSE (NFC)

[artagnon]

No description provided.

[llvmbot]

@llvm/pr-subscribers-llvm-selectiondag

Author: Ramkumar Ramachandra (artagnon)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/169020.diff

1 Files Affected:

• (modified) llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (+2-2)

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 94afdc5db6613..6c9a0ba4be07f 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -11763,12 +11763,12 @@ SDValue DAGCombiner::visitBITREVERSE(SDNode *N) {
 
   // fold (bitreverse (lshr (bitreverse x), y)) -> (shl x, y)
   if ((!LegalOperations || TLI.isOperationLegal(ISD::SHL, VT)) &&
-      sd_match(N, m_BitReverse(m_Srl(m_BitReverse(m_Value(X)), m_Value(Y)))))
+      sd_match(N0, m_Srl(m_BitReverse(m_Value(X)), m_Value(Y))))
     return DAG.getNode(ISD::SHL, DL, VT, X, Y);
 
   // fold (bitreverse (shl (bitreverse x), y)) -> (lshr x, y)
   if ((!LegalOperations || TLI.isOperationLegal(ISD::SRL, VT)) &&
-      sd_match(N, m_BitReverse(m_Shl(m_BitReverse(m_Value(X)), m_Value(Y)))))
+      sd_match(N0, m_Shl(m_BitReverse(m_Value(X)), m_Value(Y))))
     return DAG.getNode(ISD::SRL, DL, VT, X, Y);
 
   return SDValue();

[pfusik]

LGTM