[llvm] r359872 - [SelectionDAG] computeKnownBits - remove some duplicate/shadow variables. NFCI.

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Fri May  3 04:11:03 2019
New Revision: 359872

URL: http://llvm.org/viewvc/llvm-project?rev=359872&view=rev
Log:
[SelectionDAG] computeKnownBits - remove some duplicate/shadow variables. NFCI.

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

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp?rev=359872&r1=359871&r2=359872&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp Fri May  3 04:11:03 2019
@@ -3059,21 +3059,20 @@ KnownBits SelectionDAG::computeKnownBits
   case ISD::EXTRACT_ELEMENT: {
     Known = computeKnownBits(Op.getOperand(0), Depth+1);
     const unsigned Index = Op.getConstantOperandVal(1);
-    const unsigned BitWidth = Op.getValueSizeInBits();
+    const unsigned EltBitWidth = Op.getValueSizeInBits();
 
     // Remove low part of known bits mask
-    Known.Zero = Known.Zero.getHiBits(Known.Zero.getBitWidth() - Index * BitWidth);
-    Known.One = Known.One.getHiBits(Known.One.getBitWidth() - Index * BitWidth);
+    Known.Zero = Known.Zero.getHiBits(Known.getBitWidth() - Index * EltBitWidth);
+    Known.One = Known.One.getHiBits(Known.getBitWidth() - Index * EltBitWidth);
 
     // Remove high part of known bit mask
-    Known = Known.trunc(BitWidth);
+    Known = Known.trunc(EltBitWidth);
     break;
   }
   case ISD::EXTRACT_VECTOR_ELT: {
     SDValue InVec = Op.getOperand(0);
     SDValue EltNo = Op.getOperand(1);
     EVT VecVT = InVec.getValueType();
-    const unsigned BitWidth = Op.getValueSizeInBits();
     const unsigned EltBitWidth = VecVT.getScalarSizeInBits();
     const unsigned NumSrcElts = VecVT.getVectorNumElements();
     // If BitWidth > EltBitWidth the value is anyext:ed. So we do not know
@@ -3670,7 +3669,6 @@ unsigned SelectionDAG::ComputeNumSignBit
     SDValue InVec = Op.getOperand(0);
     SDValue InVal = Op.getOperand(1);
     SDValue EltNo = Op.getOperand(2);
-    unsigned NumElts = InVec.getValueType().getVectorNumElements();
 
     ConstantSDNode *CEltNo = dyn_cast<ConstantSDNode>(EltNo);
     if (CEltNo && CEltNo->getAPIntValue().ult(NumElts)) {