Re: The Emacs master is much slower than the emacs-27 branch.

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Re: The Emacs master is much slower than the emacs-27 branch.

From: Gregory Heytings

Subject: Re: The Emacs master is much slower than the emacs-27 branch.

Date: 2020年12月05日 08:14:24 +0000

User-agent: Alpine 2.22 (NEB 394 2020年01月19日)

Sorry, I meant: it only improves compilation with -Og _and -O0_. Idon't know if -O0 is important.
Given my measurements (see upthread), the effect on -O0 build isnegligible. And yes, -O0 _is_ important.

I don't know what happens on your computer (what is yourplatform/compiler?) but on mine (Debian GNU/Linux with the latest Linuxkernel and the latest GCC) the effect on -O0 is almost the same as on -Ogfor this particular benchmark. I just tried again on the emacs-27 branch:

-Og: ~67s
-O0: ~63s
-O1: ~26s
-O2: ~18s
-O3: ~17s

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