Eli Zaretskii <eliz@gnu.org> schrieb am Fr., 29. Dez. 2017 um 21:27 Uhr:

> > From: Philipp Stephani <p.stephani2@gmail.com>
> > Date: Fri, 29 Dec 2017 20:14:41 +0000
> > Cc: alan@idiocy.org, phst@google.com, emacs-devel@gnu.org
> >
> > diff --git a/src/coding.c b/src/coding.c
> > index 1705838ffa..9903d87b92 100644
> > --- a/src/coding.c
> > +++ b/src/coding.c
> > @@ -1515,13 +1515,6 @@ encode_coding_utf_8 (struct coding_system *coding)
> >  /* See the above "GENERAL NOTES on `detect_coding_XXX ()' functions".
> >     Return true if a text is encoded in one of UTF-16 based coding
> systems.  */
> >
> > -#define UTF_16_HIGH_SURROGATE_P(val) \
> > -  (((val) & 0xFC00) == 0xD800)
> > -
> > -#define UTF_16_LOW_SURROGATE_P(val) \
> > -  (((val) & 0xFC00) == 0xDC00)
> > -
> > -
> >  static bool
> >  detect_coding_utf_16 (struct coding_system *coding,
> >                     struct coding_detection_info *detect_info)
> > @@ -1686,7 +1679,7 @@ decode_coding_utf_16 (struct coding_system
> *coding)
> >
> >        if (surrogate)
> >       {
> > -       if (! UTF_16_LOW_SURROGATE_P (c))
> > +       if (! char_low_surrogate_p (c))
>
> Please don't.  This makes decoding UTF-16 a tad slower for no good
> reason (more than a tad in unoptimized builds).
>
>
OK, here's a new version of the patch.