AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-09 23:00:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

(__mempcpy): For gcc 3.0+, don't use

Browse Source 
__mempcpy_small but instead use __builtin_memcpy ( , , n) + n for
short lengths and constant src.
(strcpy): Don't optimize for gcc 3.0+.
(__stpcpy): For gcc 3.0+, don't use
__stpcpy_small but instead use __builtin_strcpy (, src) + strlen (src)
for short string literal src.
This commit is contained in:
Ulrich Drepper 2002-01-29 03:31:42 +00:00
parent 58db8a88b0
commit 96f3aa5253
1 changed files with 46 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
string/bits/string2.h
View File

@ -1,5 +1,5 @@
/* Machine-independant string function optimizations. /* Machine-independant string function optimizations.
Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. Copyright (C) 1997,1998,1999,2000,2001,2002 Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@ -198,26 +198,35 @@ __STRING2_COPY_TYPE (8);
#ifdef __USE_GNU #ifdef __USE_GNU
# if !defined _HAVE_STRING_ARCH_mempcpy || defined _FORCE_INLINES # if !defined _HAVE_STRING_ARCH_mempcpy || defined _FORCE_INLINES
# ifndef _HAVE_STRING_ARCH_mempcpy # ifndef _HAVE_STRING_ARCH_mempcpy
# define __mempcpy(dest, src, n) \ # if __GNUC_PREREQ (3, 0)
# define __mempcpy(dest, src, n) \
(__extension__ (__builtin_constant_p (src) && __builtin_constant_p (n) \
&& __string2_1bptr_p (src) && n <= 8 \
? __builtin_memcpy (dest, src, n) + n \
: __mempcpy (dest, src, n)))
# else
# define __mempcpy(dest, src, n) \
(__extension__ (__builtin_constant_p (src) && __builtin_constant_p (n) \ (__extension__ (__builtin_constant_p (src) && __builtin_constant_p (n) \
&& __string2_1bptr_p (src) && n <= 8 \ && __string2_1bptr_p (src) && n <= 8 \
? __mempcpy_small (dest, __mempcpy_args (src), n) \ ? __mempcpy_small (dest, __mempcpy_args (src), n) \
: __mempcpy (dest, src, n))) : __mempcpy (dest, src, n)))
# endif
/* In glibc we use this function frequently but for namespace reasons /* In glibc we use this function frequently but for namespace reasons
we have to use the name `__mempcpy'. */ we have to use the name `__mempcpy'. */
# define mempcpy(dest, src, n) __mempcpy (dest, src, n) # define mempcpy(dest, src, n) __mempcpy (dest, src, n)
# endif # endif
# if _STRING_ARCH_unaligned # if !__GNUC_PREREQ (3, 0) || defined _FORCE_INLINES
# ifndef _FORCE_INLINES # if _STRING_ARCH_unaligned
# define __mempcpy_args(src) \ # ifndef _FORCE_INLINES
# define __mempcpy_args(src) \
((__const char *) (src))[0], ((__const char *) (src))[2], \ ((__const char *) (src))[0], ((__const char *) (src))[2], \
((__const char *) (src))[4], ((__const char *) (src))[6], \ ((__const char *) (src))[4], ((__const char *) (src))[6], \
__extension__ __STRING2_SMALL_GET16 (src, 0), \ __extension__ __STRING2_SMALL_GET16 (src, 0), \
__extension__ __STRING2_SMALL_GET16 (src, 4), \ __extension__ __STRING2_SMALL_GET16 (src, 4), \
__extension__ __STRING2_SMALL_GET32 (src, 0), \ __extension__ __STRING2_SMALL_GET32 (src, 0), \
__extension__ __STRING2_SMALL_GET32 (src, 4) __extension__ __STRING2_SMALL_GET32 (src, 4)
# endif # endif
__STRING_INLINE void *__mempcpy_small (void *, char, char, char, char, __STRING_INLINE void *__mempcpy_small (void *, char, char, char, char,
__uint16_t, __uint16_t, __uint32_t, __uint16_t, __uint16_t, __uint32_t,
__uint32_t, size_t); __uint32_t, size_t);
@ -283,9 +292,9 @@ __mempcpy_small (void *__dest1,
} }
return (void *) __u; return (void *) __u;
} }
# else # else
# ifndef _FORCE_INLINES # ifndef _FORCE_INLINES
# define __mempcpy_args(src) \ # define __mempcpy_args(src) \
((__const char *) (src))[0], \ ((__const char *) (src))[0], \
__extension__ ((__STRING2_COPY_ARR2) \ __extension__ ((__STRING2_COPY_ARR2) \
{ { ((__const char *) (src))[0], ((__const char *) (src))[1] } }), \ { { ((__const char *) (src))[0], ((__const char *) (src))[1] } }), \
@ -313,7 +322,7 @@ __mempcpy_small (void *__dest1,
((__const char *) (src))[2], ((__const char *) (src))[3], \ ((__const char *) (src))[2], ((__const char *) (src))[3], \
((__const char *) (src))[4], ((__const char *) (src))[5], \ ((__const char *) (src))[4], ((__const char *) (src))[5], \
((__const char *) (src))[6], ((__const char *) (src))[7] } }) ((__const char *) (src))[6], ((__const char *) (src))[7] } })
# endif # endif
__STRING_INLINE void *__mempcpy_small (void *, char, __STRING2_COPY_ARR2, __STRING_INLINE void *__mempcpy_small (void *, char, __STRING2_COPY_ARR2,
__STRING2_COPY_ARR3, __STRING2_COPY_ARR3,
__STRING2_COPY_ARR4, __STRING2_COPY_ARR4,
@ -367,6 +376,7 @@ __mempcpy_small (void *__dest, char __src1,
} }
return __extension__ ((void *) __u + __srclen); return __extension__ ((void *) __u + __srclen);
} }
# endif
# endif # endif
# endif # endif
#endif #endif
@ -383,8 +393,9 @@ extern void *__rawmemchr (const void *__s, int __c);
/* Copy SRC to DEST. */ /* Copy SRC to DEST. */
#if !defined _HAVE_STRING_ARCH_strcpy || defined _FORCE_INLINES #if (!defined _HAVE_STRING_ARCH_strcpy && !__GNUC_PREREQ (3, 0)) \
# ifndef _HAVE_STRING_ARCH_strcpy || defined _FORCE_INLINES
# if !defined _HAVE_STRING_ARCH_strcpy && !__GNUC_PREREQ (3, 0)
# define strcpy(dest, src) \ # define strcpy(dest, src) \
(__extension__ (__builtin_constant_p (src) \ (__extension__ (__builtin_constant_p (src) \
? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8 \ ? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8 \
@ -547,26 +558,38 @@ __strcpy_small (char *__dest,
#ifdef __USE_GNU #ifdef __USE_GNU
# if !defined _HAVE_STRING_ARCH_stpcpy || defined _FORCE_INLINES # if !defined _HAVE_STRING_ARCH_stpcpy || defined _FORCE_INLINES
# ifndef _HAVE_STRING_ARCH_stpcpy # ifndef _HAVE_STRING_ARCH_stpcpy
# define __stpcpy(dest, src) \ # if __GNUC_PREREQ (3, 0)
# define __stpcpy(dest, src) \
(__extension__ (__builtin_constant_p (src) \
? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8 \
? __builtin_strcpy (dest, src) + strlen (src) \
: ((char *) (__mempcpy) (dest, src, strlen (src) + 1) \
- 1)) \
: __stpcpy (dest, src)))
# else
# define __stpcpy(dest, src) \
(__extension__ (__builtin_constant_p (src) \ (__extension__ (__builtin_constant_p (src) \
? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8 \ ? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8 \
? __stpcpy_small (dest, __stpcpy_args (src), \ ? __stpcpy_small (dest, __stpcpy_args (src), \
strlen (src) + 1) \ strlen (src) + 1) \
: ((char *) __mempcpy (dest, src, strlen (src) + 1) - 1))\ : ((char *) (__mempcpy) (dest, src, strlen (src) + 1) \
- 1)) \
: __stpcpy (dest, src))) : __stpcpy (dest, src)))
# endif
/* In glibc we use this function frequently but for namespace reasons /* In glibc we use this function frequently but for namespace reasons
we have to use the name `__stpcpy'. */ we have to use the name `__stpcpy'. */
# define stpcpy(dest, src) __stpcpy (dest, src) # define stpcpy(dest, src) __stpcpy (dest, src)
# endif # endif
# if _STRING_ARCH_unaligned # if !__GNUC_PREREQ (3, 0) || _FORCE_INLINES
# ifndef _FORCE_INLINES # if _STRING_ARCH_unaligned
# define __stpcpy_args(src) \ # ifndef _FORCE_INLINES
# define __stpcpy_args(src) \
__extension__ __STRING2_SMALL_GET16 (src, 0), \ __extension__ __STRING2_SMALL_GET16 (src, 0), \
__extension__ __STRING2_SMALL_GET16 (src, 4), \ __extension__ __STRING2_SMALL_GET16 (src, 4), \
__extension__ __STRING2_SMALL_GET32 (src, 0), \ __extension__ __STRING2_SMALL_GET32 (src, 0), \
__extension__ __STRING2_SMALL_GET32 (src, 4) __extension__ __STRING2_SMALL_GET32 (src, 4)
# endif # endif
__STRING_INLINE char *__stpcpy_small (char *, __uint16_t, __uint16_t, __STRING_INLINE char *__stpcpy_small (char *, __uint16_t, __uint16_t,
__uint32_t, __uint32_t, size_t); __uint32_t, __uint32_t, size_t);
__STRING_INLINE char * __STRING_INLINE char *
@ -626,9 +649,9 @@ __stpcpy_small (char *__dest,
} }
return &__u->__c; return &__u->__c;
} }
# else # else
# ifndef _FORCE_INLINES # ifndef _FORCE_INLINES
# define __stpcpy_args(src) \ # define __stpcpy_args(src) \
__extension__ ((__STRING2_COPY_ARR2) \ __extension__ ((__STRING2_COPY_ARR2) \
{ { ((__const char *) (src))[0], '\0' } }), \ { { ((__const char *) (src))[0], '\0' } }), \
__extension__ ((__STRING2_COPY_ARR3) \ __extension__ ((__STRING2_COPY_ARR3) \
@ -655,7 +678,7 @@ __stpcpy_small (char *__dest,
((__const char *) (src))[2], ((__const char *) (src))[3], \ ((__const char *) (src))[2], ((__const char *) (src))[3], \
((__const char *) (src))[4], ((__const char *) (src))[5], \ ((__const char *) (src))[4], ((__const char *) (src))[5], \
((__const char *) (src))[6], '\0' } }) ((__const char *) (src))[6], '\0' } })
# endif # endif
__STRING_INLINE char *__stpcpy_small (char *, __STRING2_COPY_ARR2, __STRING_INLINE char *__stpcpy_small (char *, __STRING2_COPY_ARR2,
__STRING2_COPY_ARR3, __STRING2_COPY_ARR3,
__STRING2_COPY_ARR4, __STRING2_COPY_ARR4,
@ -709,6 +732,7 @@ __stpcpy_small (char *__dest,
} }
return __dest + __srclen - 1; return __dest + __srclen - 1;
} }
# endif
# endif # endif
# endif # endif
#endif #endif