// branchOpCode: the normal case: (a<b) therefore BLT
// flipOpCode: the flipped case: (a<b)==(b>a), therefore BGT
// inverseOpCode: the inverse case: (a<b)==!(a>=b), therefore BGE
// flipInverseOpCode: the flipped inverse case: (a<b)==!(b<=a), therefore BLE
private static CompareOp CreateHelper(IntExpression lhs, IntExpression rhs,
Format16OpCode branchOpCode, Format16OpCode flipOpCode, Format16OpCode inverseOpCode, Format16OpCode flipInverseOpCode)
{
if (lhs.IsConstant())
{
if (rhs.IsConstant())
{
throw new Exception("ridiculous");
}
//flip the constant over to the right side, for better code generation
return(new CompareOp(rhs, lhs, flipOpCode, flipInverseOpCode));
}
return(new CompareOp(lhs, rhs, branchOpCode, inverseOpCode));
}
