Re: Long lines and bidi

[Dmitry Antipov]

On 02/11/2013 09:43 AM, Dmitry Antipov wrote:

> Yet another interesting profile (generated by scroll-both micro-benchmark with
> r111730) is shown below.
>
> Input is 4K lines, each line is ~27K bytes, Imla'ei (modern Arabic) script. IIUC
> this R2L text with long lines should push bidi really hard, but ... bidi core
> routines (by itself) are almost irrelevant in the profile:
>
>      39.96%        emacs  emacs                          [.] scan_buffer
>      28.72%        emacs  emacs                          [.] 
> buf_charpos_to_bytepos
>      21.82%        emacs  emacs                          [.] 
> buf_bytepos_to_charpos
>       0.59%        emacs  emacs                          [.] re_match_2_internal

... and with Paul's mem(r)chr patch it is:

    43.38%        emacs  emacs                          [.] 
buf_charpos_to_bytepos
    28.42%        emacs  emacs                          [.] 
buf_bytepos_to_charpos
    13.10%        emacs  libc-2.16.so                   [.] memrchr
     0.85%        emacs  emacs                          [.] re_match_2_internal
...

So I should vote YES. This is simple optimization which really makes sense,
and I suspect that the "less usual" input is, the more sense it has.

Dmitry