[llvm] f45b759 - [DAG] SimplifyDemandedBits - call demanded elts variant directly for SELECT/SELECT_CC nodes.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2024-01-04T10:53:45Z
New Revision: f45b75949d8ccc9890241ecf9b9ad11349e1d036

URL: https://github.com/llvm/llvm-project/commit/f45b75949d8ccc9890241ecf9b9ad11349e1d036
DIFF: https://github.com/llvm/llvm-project/commit/f45b75949d8ccc9890241ecf9b9ad11349e1d036.diff

LOG: [DAG] SimplifyDemandedBits - call demanded elts variant directly for SELECT/SELECT_CC nodes.

Don't rebuild the demanded elts mask every time.

Added: 
    

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

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index c28e8acd57a14a..f8400e8e94df61 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -1645,11 +1645,11 @@ bool TargetLowering::SimplifyDemandedBits(
     break;
   }
   case ISD::SELECT:
-    if (SimplifyDemandedBits(Op.getOperand(2), DemandedBits, Known, TLO,
-                             Depth + 1))
+    if (SimplifyDemandedBits(Op.getOperand(2), DemandedBits, DemandedElts,
+                             Known, TLO, Depth + 1))
       return true;
-    if (SimplifyDemandedBits(Op.getOperand(1), DemandedBits, Known2, TLO,
-                             Depth + 1))
+    if (SimplifyDemandedBits(Op.getOperand(1), DemandedBits, DemandedElts,
+                             Known2, TLO, Depth + 1))
       return true;
     assert(!Known.hasConflict() && "Bits known to be one AND zero?");
     assert(!Known2.hasConflict() && "Bits known to be one AND zero?");
@@ -1675,11 +1675,11 @@ bool TargetLowering::SimplifyDemandedBits(
     Known = Known.intersectWith(Known2);
     break;
   case ISD::SELECT_CC:
-    if (SimplifyDemandedBits(Op.getOperand(3), DemandedBits, Known, TLO,
-                             Depth + 1))
+    if (SimplifyDemandedBits(Op.getOperand(3), DemandedBits, DemandedElts,
+                             Known, TLO, Depth + 1))
       return true;
-    if (SimplifyDemandedBits(Op.getOperand(2), DemandedBits, Known2, TLO,
-                             Depth + 1))
+    if (SimplifyDemandedBits(Op.getOperand(2), DemandedBits, DemandedElts,
+                             Known2, TLO, Depth + 1))
       return true;
     assert(!Known.hasConflict() && "Bits known to be one AND zero?");
     assert(!Known2.hasConflict() && "Bits known to be one AND zero?");