Re: Signed vs. unsigned compares
> On Jun 17, 2022, at 11:51 AM, Andreas Schwab wrote: > > On Jun 17 2022, Paul Koning via Gcc wrote: > >> In expanding a longer-than-word compare, I need to do things differently >> depending on whether a signed vs. unsigned compare is needed. But it seems >> the compare operation applies to either. How can I do this in the target >> code? > > There are both signed and unsigned comparison operations, eg. GE > vs. GEU. > > -- > Andreas Schwab, sch...@linux-m68k.org It looks like what I need is to define additional CCmodes, to describe "cc mode valid for unsigned comparison" vs. "cc mode valid for signed comparison". Right now I don't make that distinction and that reportedly can produce bad code errors. paul
Re: Signed vs. unsigned compares
On Jun 17 2022, Paul Koning via Gcc wrote: > In expanding a longer-than-word compare, I need to do things differently > depending on whether a signed vs. unsigned compare is needed. But it seems > the compare operation applies to either. How can I do this in the target > code? There are both signed and unsigned comparison operations, eg. GE vs. GEU. -- Andreas Schwab, sch...@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."
Signed vs. unsigned compares
Question for target code: In expanding a longer-than-word compare, I need to do things differently depending on whether a signed vs. unsigned compare is needed. But it seems the compare operation applies to either. How can I do this in the target code? paul
