[llvm] 47f99d2 - [SelectionDAG] GetDemandedBits - remove ANY_EXTEND handling

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2020-01-21T14:39:00Z
New Revision: 47f99d2ca8adbecb59d04dad550262363b513d6d

URL: https://github.com/llvm/llvm-project/commit/47f99d2ca8adbecb59d04dad550262363b513d6d
DIFF: https://github.com/llvm/llvm-project/commit/47f99d2ca8adbecb59d04dad550262363b513d6d.diff

LOG: [SelectionDAG] GetDemandedBits - remove ANY_EXTEND handling

Rely on SimplifyMultipleUseDemandedBits fallback instead.

Added: 
    

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

Removed: 
    


################################################################################
diff  --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index e191abb154fe..6c793afefe0d 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2226,19 +2226,6 @@ SDValue SelectionDAG::GetDemandedBits(SDValue V, const APInt &DemandedBits,
     }
     break;
   }
-  case ISD::ANY_EXTEND: {
-    SDValue Src = V.getOperand(0);
-    unsigned SrcBitWidth = Src.getScalarValueSizeInBits();
-    // Being conservative here - only peek through if we only demand bits in the
-    // non-extended source (even though the extended bits are technically
-    // undef).
-    if (DemandedBits.getActiveBits() > SrcBitWidth)
-      break;
-    APInt SrcDemandedBits = DemandedBits.trunc(SrcBitWidth);
-    if (SDValue DemandedSrc = GetDemandedBits(Src, SrcDemandedBits))
-      return getNode(ISD::ANY_EXTEND, SDLoc(V), V.getValueType(), DemandedSrc);
-    break;
-  }
   }
   return SDValue();
 }