bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?

[Stefan Monnier]

>>> * configure.ac: On x86 with GCC, default to -msse2 -mfpmath=sse.
>> This assumes that the system on which Emacs runs is the same as where
>> it was built, doesn't it?
> It doesn't assume they're the same system. It merely assumes that build and
> host platforms both support SSE2, which is a safe assumption nowadays.

Is there a way to tell gcc to try and avoid x87's idiosyncrasies without
being platform-dependent (or at least without imposing SSE2, since
I still use Emacs on my old Thinkpad X30)?


        Stefan