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More APInt-ification.

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llvm-svn: 47868
This commit is contained in:
Dan Gohman 2008-03-03 23:35:36 +00:00
parent 48e3b966fe
commit 5792bdb74e
1 changed files with 6 additions and 10 deletions
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16
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -1518,17 +1518,13 @@ unsigned SelectionDAG::ComputeNumSignBits(SDOperand Op, unsigned Depth) const{
return VTBits-Tmp;
case ISD::Constant: {
uint64_t Val = cast<ConstantSDNode>(Op)->getValue();
// If negative, invert the bits, then look at it.
if (Val & MVT::getIntVTSignBit(VT))
Val = ~Val;
const APInt &Val = cast<ConstantSDNode>(Op)->getAPIntValue();
// If negative, return # leading ones.
if (Val.isNegative())
return Val.countLeadingOnes();
// Shift the bits so they are the leading bits in the int64_t.
Val <<= 64-VTBits;
// Return # leading zeros. We use 'min' here in case Val was zero before
// shifting. We don't want to return '64' as for an i32 "0".
return std::min(VTBits, CountLeadingZeros_64(Val));
// Return # leading zeros.
return Val.countLeadingZeros();
}
case ISD::SIGN_EXTEND: