On Fri, May 24, 2019 at 7:54 PM tedheadster <tedheadster@xxxxxxxxx> wrote:
>
> I am compiling with gcc 7.3.0 for -march=c3-2, and it is generating
> illegal Pentium-III vintage SSE instructions.
>
> The VIA C3-2 (Nehemiah model) is an i686 Pentium Pro class processor,
> so these instructions should never have been generated.
>
Of course I should have done some more research. I found this in
gcc/config/i386/i386.c:
{"c3-2", PROCESSOR_PENTIUMPRO, CPU_PENTIUMPRO,
PTA_MMX | PTA_SSE | PTA_FXSR},
I am pretty sure I got that wrong, and seems (from Wikipedia at least)
the C3-2 does indeed support SSE instructions.
- Matthew
