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Merge branch 'data-input-stream-optimisation' into 'main'

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gdatainputstream: Use memchr() for the multi-stop-char case too

See merge request GNOME/glib!4352
This commit is contained in:
Michael Catanzaro 2024-10-17 15:42:03 +00:00
commit 85b53d6317
2 changed files with 10 additions and 11 deletions
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19
gio/gdatainputstream.c
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@ -861,11 +861,8 @@ scan_for_chars (GDataInputStream *stream,
gsize start, end, peeked;
gsize i;
gsize available, checked;
const char *stop_char;
const char *stop_end;
bstream = G_BUFFERED_INPUT_STREAM (stream);
stop_end = stop_chars + stop_chars_len;
checked = *checked_out;
@ -874,8 +871,8 @@ scan_for_chars (GDataInputStream *stream,
end = available;
peeked = end - start;
/* For single-char case such as \0, defer to memchr which can
* take advantage of simd/etc.
/* For single-char case such as \0, defer the entire operation to memchr which
* can take advantage of simd/etc.
*/
if (stop_chars_len == 1)
{
@ -888,11 +885,13 @@ scan_for_chars (GDataInputStream *stream,
{
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);
}
/* We can use memchr() the other way round. Less fast than the
* single-char case above, but still faster than doing our own inner
* loop. */
const char *p = memchr (stop_chars, buffer[i], stop_chars_len);
if (p != NULL)
return (start + i);
}
}

2
gio/tests/data-input-stream.c
View File

@ -314,7 +314,7 @@ test_read_upto (void)
const char *data_sep;
size_t data_sep_len;
} vectors[] = {
{ 10, " part1 # part2 $ part3 \0 part4 ", 32, 7, "#$\0^", 4 },
{ 10, " part1 # part2 $ part3 \0 part4 \0", 32, 7, "#$\0^", 4 },
{ 20, "{\"key\": \"value\"}\0", 17, 16, "\0", 1 },
};