GNU bug report logs - #42147
28.0.50; pure vs side-effect-free, missing optimizations?

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: mattiase <at> acm.org, Eli Zaretskii <eliz <at> gnu.org>, andrea_corallo <at> yahoo.it, 42147 <at> debbugs.gnu.org
Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?
Date: Sat, 04 Jul 2020 12:33:57 -0400

>>> * 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

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