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Re: impact of -minsert-sched-nops
On Mon, Nov 24, 2003 at 02:42:54PM -0500, David Edelsohn wrote:
> >>>>> Jack Howarth writes:
>
> Jack> Does anyone know what the impact is of using -minsert-sched-nops
> Jack> on a non-Power4 processor? That is if I compile some fortran with
> Jack> -minsert-sched-nops on g77 for use on a G5, will the same code work
> Jack> properly on a G4 as well? Thanks in advance for any clarifications.
>
> Yes, the NOPs have no effect on G4 processors. It's the normal
> PowerPC NOP instruction.
>
> However, targeting G5 may generate some other new instructions.
Which ones, floating point sqrt perhaps ?
IBM's publically available documentation on the 970 is poor, to put it
very mildly. I have for example found zero documentation on the MMU
(I know it has no BATs and big page capabilities, but only indirectly
through mailing lists).
Gabriel