Compiling with -march=c3-2 generates illegal SSE instructions

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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.

>From /usr/bin/nano:
0xb7f55e2f <+415>:   cvttss2si 0x14(%esp),%eax

>From /usr/bin/top:
0x00403001 <+2273>:  movss  0x64(%esp),%xmm0

I don't think I should have to do anything besides set -march=c3-2,
but perhaps I am wrong?

- Matthew



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