[TargetLowering] SimplifyDemandedBits - Cleanup ANY_EXTEND handling

Match SIGN_EXTEND + ZERO_EXTEND handling - will be adding ANY_EXTEND_VECTOR_INREG support in a future patch.

llvm-svn: 363716

Author: RKSimon

llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp

@@ -1440,12 +1440,18 @@ bool TargetLowering::SimplifyDemandedBits(
     break;
   }
   case ISD::ANY_EXTEND: {
+    // TODO: Add ISD::ANY_EXTEND_VECTOR_INREG support.
     SDValue Src = Op.getOperand(0);
-    unsigned InBits = Src.getScalarValueSizeInBits();
+    EVT SrcVT = Src.getValueType();
+    unsigned InBits = SrcVT.getScalarSizeInBits();
+    unsigned InElts = SrcVT.isVector() ? SrcVT.getVectorNumElements() : 1;
     APInt InDemandedBits = DemandedBits.trunc(InBits);
-    if (SimplifyDemandedBits(Src, InDemandedBits, Known, TLO, Depth + 1))
+    APInt InDemandedElts = DemandedElts.zextOrSelf(InElts);
+    if (SimplifyDemandedBits(Src, InDemandedBits, InDemandedElts, Known, TLO,
+                             Depth + 1))
       return true;
     assert(!Known.hasConflict() && "Bits known to be one AND zero?");
+    assert(Known.getBitWidth() == InBits && "Src width has changed?");
     Known = Known.zext(BitWidth, false /* => any extend */);
     break;
   }