Re: Redisplay slower in Emacs 28 than Emacs 27

[Lars Ingebrigtsen]

Gregory Heytings <ghe@sdf.org> writes:

> With equal_lists 18.7s, with !equal_lists 16.1s.
>
> This difference is not due to an obscure compiler bug, the timings
> above are with GCC 10, but the timings with Clang 9 are similar: with
> equal_lists 19.0s, with !equal_lists 16.6s.

Very interesting.  Using the image cache for small images slows Emacs
down?  Or is there a bug in equal_lists?

Just to make 100% sure -- could you re-run the benchmark with something
like the following as the function:

static struct image *
search_image_cache (struct frame *f, Lisp_Object spec, EMACS_UINT hash,
                    unsigned long foreground, unsigned long background,
                    bool ignore_colors)
{
  return NULL;
}


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