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string: Improve generic strrchr with memrchr and strlen

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Now that both strlen and memrchr have word vectorized implementation,
it should be faster to implement strrchr based on memrchr over the
string length instead of calling strchr on a loop.

Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc-linux-gnu,
and powerpc64-linux-gnu by removing the arch-specific assembly
implementation and disabling multi-arch (it covers both LE and BE
for 64 and 32 bits).
This commit is contained in:
Adhemerval Zanella 2023-02-02 13:44:13 -03:00
parent 9d4fa7a1ca
commit 167f6230af
1 changed files with 1 additions and 17 deletions
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18
string/strrchr.c
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@ -27,23 +27,7 @@
char *
STRRCHR (const char *s, int c)
{
const char *found, *p;
c = (unsigned char) c;
/* Since strchr is fast, we use it rather than the obvious loop. */
if (c == '\0')
return strchr (s, '\0');
found = NULL;
while ((p = strchr (s, c)) != NULL)
{
found = p;
s = p + 1;
}
return (char *) found;
return __memrchr (s, c, strlen (s) + 1);
}
#ifdef weak_alias