[LLVMbugs] [Bug 6335] New: TargetLowering:: SimplifyDemandedBits incorrectly handles vector types on Truncate

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=6335

           Summary: TargetLowering::SimplifyDemandedBits incorrectly handles
                    vector types on Truncate
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: micah.villmow at amd.com
                CC: llvmbugs at cs.uiuc.edu


the code at lines 1394 and 1405 only get value ValueSize in bits instead of the
scalar size.
This was fixed in the sign extension instructions but not truncate.
TargetLowering:1394
 APInt TruncMask = NewMask;
    TruncMask.zext(Op.getOperand(0).getValueSizeInBits());
    if (SimplifyDemandedBits(Op.getOperand(0), TruncMask,
                             KnownZero, KnownOne, TLO, Depth+1))
Needs to be:
unsigned OperandBitWidth =
      Op.getOperand(0).getValueType().getScalarType().getSizeInBits();
    APInt TruncMask = NewMask;
    TruncMask.zext(OperandBitWidth);
    if (SimplifyDemandedBits(Op.getOperand(0), TruncMask,
                             KnownZero, KnownOne, TLO, Depth+1))

Again:
 if (Op.getOperand(0).getNode()->hasOneUse()) {
      SDValue In = Op.getOperand(0);
      unsigned InBitWidth = In.getValueSizeInBits();
      switch (In.getOpcode()) {

Needs to be:
 if (Op.getOperand(0).getNode()->hasOneUse()) {
      SDValue In = Op.getOperand(0);
      unsigned InBitWidth = In.getValueType().getScalarType().getSizeInBits();
      switch (In.getOpcode()) {


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