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

[Andrea Corallo]

Paul Eggert <eggert@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@sdf.org