Greg McGary <[EMAIL PROTECTED]> writes:
> I'm working on a port that has instructions to move bits between
> 64-bit floating-point and 64-bit general-purpose regs. I say "bits"
> because there's no conversion between float and int: the bit pattern
> is unaltered. Therefore, it's possible to use scratch FPRs for
> spilling GPRs & vice-versa, and float<->int conversions need not go
> through memory.
>
> Among all the knobs to turn regarding register classes, reload
> classes, and modes+constraints on movM, floatMN2, fixMN2 patterns,
> I need some advice on how to do this properly.
The Alpha port supports the "itof" and "ftoi" instructions, which do
exactly that. So you might want to look there.
--
Falk
