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gio/gdatainputstream: use memchr() when possible

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Scanning for stop chars can require looking through a considerable amount
of input data. In the case there is a single stop character, use memchr()
which can be optimized by the compiler to look at word size or greater
amounts of data at a time.
This commit is contained in:
Christian Hergert 2024-10-02 13:33:17 -07:00
parent 17124abc7e
commit e7e5ddd2ae
1 changed files with 19 additions and 6 deletions
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25
gio/gdatainputstream.c
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@ -870,13 +870,26 @@ scan_for_chars (GDataInputStream *stream,
end = available;
peeked = end - start;
for (i = 0; checked < available && i < peeked; i++)
/* For single-char case such as \0, defer to memchr which can
* take advantage of simd/etc.
*/
if (stop_chars_len == 1)
{
for (stop_char = stop_chars; stop_char != stop_end; stop_char++)
{
if (buffer[i] == *stop_char)
return (start + i);
}
const char *p = memchr (buffer, stop_chars[0], peeked);
if (p != NULL)
return start + (p - buffer);
}
else
{
for (i = 0; checked < available && i < peeked; i++)
{
for (stop_char = stop_chars; stop_char != stop_end; stop_char++)
{
if (buffer[i] == *stop_char)
return (start + i);
}
}
}
checked = end;