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(decode_coding_utf_8): Add simple loop for fast processing of ASCII characters.

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Richard M. Stallman 2013-07-19 12:15:51 -04:00
parent 8ba8eec59b
commit a1aeeffedd
2 changed files with 44 additions and 0 deletions
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5
src/ChangeLog
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@ -1,3 +1,8 @@
2013-07-19 Richard Stallman <rms@gnu.org>
* coding.c (decode_coding_utf_8): Add simple loop for fast
processing of ASCII characters.
2013-07-19 Paul Eggert <eggert@cs.ucla.edu>
* conf_post.h (RE_TRANSLATE_P) [emacs]: Remove obsolete optimization.

39
src/coding.c
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@ -1363,6 +1363,45 @@ decode_coding_utf_8 (struct coding_system *coding)
break;
}
/* In the simple case, rapidly handle ordinary characters */
if (multibytep && ! eol_dos
&& charbuf < charbuf_end - 6 && src < src_end - 6)
{
while (charbuf < charbuf_end - 6 && src < src_end - 6)
{
c1 = *src;
if (c1 & 0x80)
break;
src++;
consumed_chars++;
*charbuf++ = c1;
c1 = *src;
if (c1 & 0x80)
break;
src++;
consumed_chars++;
*charbuf++ = c1;
c1 = *src;
if (c1 & 0x80)
break;
src++;
consumed_chars++;
*charbuf++ = c1;
c1 = *src;
if (c1 & 0x80)
break;
src++;
consumed_chars++;
*charbuf++ = c1;
}
/* If we handled at least one character, restart the main loop. */
if (src != src_base)
continue;
}
if (byte_after_cr >= 0)
c1 = byte_after_cr, byte_after_cr = -1;
else