[TargetLowering] Cleanup more of the EXTEND demanded bits cases so that they match. NFCI.

Use the same variable names etc.

llvm-svn: 347045

1 files changed, 11 insertions, 10 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 2bc9090428b..76e2be650b3 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -1084,19 +1084,19 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
     break;
   }
   case ISD::ZERO_EXTEND: {
-    unsigned OperandBitWidth = Op.getOperand(0).getScalarValueSizeInBits();
+    SDValue Src = Op.getOperand(0);
+    unsigned InBits = Src.getScalarValueSizeInBits();
 
     // If none of the top bits are demanded, convert this into an any_extend.
-    if (DemandedBits.getActiveBits() <= OperandBitWidth)
-      return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::ANY_EXTEND, dl, VT,
-                                               Op.getOperand(0)));
+    if (DemandedBits.getActiveBits() <= InBits)
+      return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::ANY_EXTEND, dl, VT, Src));
 
-    APInt InMask = DemandedBits.trunc(OperandBitWidth);
-    if (SimplifyDemandedBits(Op.getOperand(0), InMask, Known, TLO, Depth+1))
+    APInt InDemandedBits = DemandedBits.trunc(InBits);
+    if (SimplifyDemandedBits(Src, InDemandedBits, Known, TLO, Depth+1))
       return true;
     assert(!Known.hasConflict() && "Bits known to be one AND zero?");
     Known = Known.zext(BitWidth);
-    Known.Zero.setBitsFrom(OperandBitWidth);
+    Known.Zero.setBitsFrom(InBits);
     break;
   }
   case ISD::SIGN_EXTEND: {
@@ -1143,9 +1143,10 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
     break;
   }
   case ISD::ANY_EXTEND: {
-    unsigned OperandBitWidth = Op.getOperand(0).getScalarValueSizeInBits();
-    APInt InMask = DemandedBits.trunc(OperandBitWidth);
-    if (SimplifyDemandedBits(Op.getOperand(0), InMask, Known, TLO, Depth+1))
+    SDValue Src = Op.getOperand(0);
+    unsigned InBits = Src.getScalarValueSizeInBits();
+    APInt InDemandedBits = DemandedBits.trunc(InBits);
+    if (SimplifyDemandedBits(Src, InDemandedBits, Known, TLO, Depth+1))
       return true;
     assert(!Known.hasConflict() && "Bits known to be one AND zero?");
     Known = Known.zext(BitWidth);