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

[Paul Eggert]

On 7/3/20 11:47 AM, Mattias Engdegård wrote:
>> Having Emacs use --with-mfpmath=sse should improve performance a bit on x86. 
>> But
>> more important, it should make floating point more reproducible. If I get the
>> time I'll look into having 'configure' add it automatically.
> Thank you, this would be a prerequisite for further improvements.

Attached is a patch to do that. I looked at the GCC source code, and x86 is the
only platform where this sort of thing should be necessary. I'll mention this
patch on emacs-devel, to give people a heads-up before installing.

0001-Prefer-standard-rounding-on-x86.patch
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