AMD K6-2s and the -mcpu=xxx switch.

Jason Gurtz flare at downcity.net
Tue Aug 8 20:43:18 PDT 2000



> Reading the pgcc mailinglist one thing I learned is that the AMD-K6-2
> uses the same instruction set like the Pentium (in fact, it adds
> 3DNow! extension, but these instructions are not supported by gcc nor
> pgcc)

How about the SIMD instructions of the P3?

, but it's scheduling is more like the one from the PentiumPro,
> so one should use "-march=pentium -mcpu=pentiumpro" aka "-march=i586
> -mcpu=i686". You may of course play with the scheduling (which is
> specified with -mcpu=), but selecting anything higher than i586 aka
> pentium for code-creation (-march=) will sooner or later result in
> broken code or (more likely) error messages from the binutils about
> illegal instructions.
>
That makes sense as the K6 line has attained much higher clock speed than
can be attributed to die size alone (most recent is 600Mhz .18u) and the
integer performance _is_ impressive  :)
> >
> > ~Jason
>
> Tomislav

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