[llvm] 01e5e4f - [DAGCombiner] Remove unneeded m_BitReverse from visitBITREVERSE. NFC (#168918)

[via llvm-commits]

Author: Craig Topper
Date: 2025-11-20T18:20:47Z
New Revision: 01e5e4fd001c960e197ac377cd06ea177b320964

URL: https://github.com/llvm/llvm-project/commit/01e5e4fd001c960e197ac377cd06ea177b320964
DIFF: https://github.com/llvm/llvm-project/commit/01e5e4fd001c960e197ac377cd06ea177b320964.diff

LOG: [DAGCombiner] Remove unneeded m_BitReverse from visitBITREVERSE. NFC (#168918)

We already know we're looking at BITREVERSE, we can match on the source
operand.

Added: 
    

Modified: 
    llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index fe010a7a44eda..ca2070e958fae 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();