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

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From: Andrea Corallo <akrl <at> sdf.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: mattiase <at> acm.org, andrea_corallo <at> yahoo.it, Stefan Monnier <monnier <at> iro.umontreal.ca>, Pip Cet <pipcet <at> gmail.com>, 42147 <at> debbugs.gnu.org
Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?
Date: Sun, 05 Jul 2020 10:03:20 +0000

Paul Eggert <eggert <at> cs.ucla.edu> writes:

> PS. I finally got around to benchmarking, and on my usual benchmark (make
> compile-always, Fedora 31 x86), using SSE2 sped up Emacs by 4.6%. So there is a
> performance argument for the change as well as a fix-the-rounding-glitches argument.

Hi Paul,

Wow I'm really surprised by this result!  Are we doing so much floating
point while compiling Emacs?  I expected it to be very marginal,
possibly something else is boiling here we are not considering?

Regards

  Andrea

-- 
akrl <at> sdf.org

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