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Re: emacs-26 eec71eb: Speed up replace-buffer-contents

From: Paul Eggert
Subject: Re: emacs-26 eec71eb: Speed up replace-buffer-contents
Date: Tue, 3 Jul 2018 13:14:29 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

Eli Zaretskii wrote:
Profiling shows that 'diag' takes 32% of the CPU time, and
buffer_chars_equal takes another 45%.  So any significant gains will
be in buffer_chars_equal, I think.

Yes, that was what my intuition was pointing at as well. Among other things, we can fix the quit problem without having a rbc_quitcounter variable.

I typically measure effectiveness of performance tweaks when using the 'configure' default of CFLAGS='-g3 -O2', since that's how it's typically built downstream. If this particular problem is all about CFLAGS=-O0 please let me know, as I guess I can look at that too (but would rather not).

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