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fix some subtle inline asm selection issues

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llvm-svn: 37067
This commit is contained in:
Chris Lattner 2007-05-15 01:31:05 +00:00
parent 9f0ffdf4b3
commit 4861b958f1
1 changed files with 17 additions and 9 deletions
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26
lib/Target/PowerPC/PPCISelLowering.cpp
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@ -3326,31 +3326,39 @@ isOperandValidForConstraint(SDOperand Op, char Letter, SelectionDAG &DAG) {
case 'N':
case 'O':
case 'P': {
if (!isa<ConstantSDNode>(Op)) return SDOperand(0,0);// Must be an immediate.
unsigned Value = cast<ConstantSDNode>(Op)->getValue();
ConstantSDNode *CST = dyn_cast<ConstantSDNode>(Op);
if (!CST) return SDOperand(0, 0); // Must be an immediate to match.
unsigned Value = CST->getValue();
switch (Letter) {
default: assert(0 && "Unknown constraint letter!");
case 'I': // "I" is a signed 16-bit constant.
if ((short)Value == (int)Value) return Op;
if ((short)Value == (int)Value)
return DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'J': // "J" is a constant with only the high-order 16 bits nonzero.
case 'L': // "L" is a signed 16-bit constant shifted left 16 bits.
if ((short)Value == 0) return Op;
if ((short)Value == 0)
return DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'K': // "K" is a constant with only the low-order 16 bits nonzero.
if ((Value >> 16) == 0) return Op;
if ((Value >> 16) == 0)
return DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'M': // "M" is a constant that is greater than 31.
if (Value > 31) return Op;
if (Value > 31)
return DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'N': // "N" is a positive constant that is an exact power of two.
if ((int)Value > 0 && isPowerOf2_32(Value)) return Op;
if ((int)Value > 0 && isPowerOf2_32(Value))
return DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'O': // "O" is the constant zero.
if (Value == 0) return Op;
if (Value == 0)
return DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'P': // "P" is a constant whose negation is a signed 16-bit constant.
if ((short)-Value == (int)-Value) return Op;
if ((short)-Value == (int)-Value)
return DAG.getTargetConstant(Value, Op.getValueType());
break;
}
break;