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Optimized memcmp and wmemcmp for x86-64 and x86-32

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This commit is contained in:
Liubov Dmitrieva
2011-10-15 11:10:08 -04:00
committed by Ulrich Drepper
parent 556a200797
commit be13f7bff6
19 changed files with 3069 additions and 335 deletions
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47
string/test-memcmp.c
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@ -29,9 +29,21 @@
# define MEMCPY wmemcpy
# define SIMPLE_MEMCMP simple_wmemcmp
# define CHAR wchar_t
# define MAX_CHAR 256000
# define UCHAR uint32_t
# define UCHAR wchar_t
# define CHARBYTES 4
# define CHAR__MIN WCHAR_MIN
# define CHAR__MAX WCHAR_MAX
int
simple_wmemcmp (const wchar_t *s1, const wchar_t *s2, size_t n)
{
int ret = 0;
/* Warning!
wmemcmp has to use SIGNED comparison for elements.
memcmp has to use UNSIGNED comparison for elemnts.
*/
while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;}
return ret;
}
#else
# define MEMCMP memcmp
# define MEMCPY memcpy
@ -40,18 +52,20 @@
# define MAX_CHAR 255
# define UCHAR unsigned char
# define CHARBYTES 1
#endif
typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
# define CHAR__MIN CHAR_MIN
# define CHAR__MAX CHAR_MAX
int
SIMPLE_MEMCMP (const CHAR *s1, const CHAR *s2, size_t n)
simple_memcmp (const char *s1, const char *s2, size_t n)
{
int ret = 0;
while (n-- && (ret = *(UCHAR *) s1++ - *(UCHAR *) s2++) == 0);
while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0);
return ret;
}
#endif
typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
IMPL (SIMPLE_MEMCMP, 0)
IMPL (MEMCMP, 1)
@ -121,7 +135,7 @@ do_test (size_t align1, size_t align2, size_t len, int exp_result)
s2 = (CHAR *) (buf2 + align2);
for (i = 0; i < len; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % MAX_CHAR;
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX;
s1[len] = align1;
s2[len] = align2;
@ -412,8 +426,8 @@ check1 (void)
s2[99] = 1;
s1[100] = 116;
s2[100] = 116;
s1[101] = -13;
s2[101] = -13;
s1[101] = CHAR__MIN;
s2[101] = CHAR__MAX;
s1[102] = -109;
s2[102] = -109;
s1[103] = 1;
@ -434,8 +448,8 @@ check1 (void)
s2[110] = -109;
s1[111] = 1;
s2[111] = 1;
s1[112] = 20;
s2[112] = 20;
s1[112] = CHAR__MAX;
s2[112] = CHAR__MIN;
s1[113] = -13;
s2[113] = -13;
s1[114] = -109;
@ -444,9 +458,12 @@ check1 (void)
s2[115] = 1;
n = 116;
exp_result = SIMPLE_MEMCMP (s1, s2, n);
FOR_EACH_IMPL (impl, 0)
check_result (impl, s1, s2, n, exp_result);
for (size_t i = 0; i < n; i++)
{
exp_result = SIMPLE_MEMCMP (s1 + i, s2 + i, n - i);
FOR_EACH_IMPL (impl, 0)
check_result (impl, s1 + i, s2 + i, n - i, exp_result);
}
}
int