diff options
| author | Ulrich Drepper <drepper@redhat.com> | 1998-07-30 12:47:25 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 1998-07-30 12:47:25 +0000 |
| commit | bdd421cc6d055af6a1a561344b2fa56267cad617 (patch) | |
| tree | be16db84076d9a9aa58deed3f7452fabc5fa4d04 /sysdeps/i386/i486/bits/string.h | |
| parent | ccd17b3265ed22f6add55b574b684f6e11a2ea8c (diff) | |
| download | glibc-bdd421cc6d055af6a1a561344b2fa56267cad617.tar.gz glibc-bdd421cc6d055af6a1a561344b2fa56267cad617.tar.xz glibc-bdd421cc6d055af6a1a561344b2fa56267cad617.zip | |
Update.
1998-07-30 12:38 Ulrich Drepper <drepper@cygnus.com> * sysdeps/i386/ffs.c: Add ffsl entry point. * sysdeps/i386/i686/ffs.c: Likewise. * sysdeps/m68k/ffs.c: Likewise. * sysdeps/powerpc/ffs.c: Likewise. * sysdeps/i386/i486/bits/string.h: Add optimizations for ffs/ffsl on i686. 1998-07-30 Richard Henderson <rth@cygnus.com> * elf/Makefile (ld-map): Move initialization below Makeconfig include. * sysdeps/libm-ieee754/k_standard.c (zero): Make non-const to work around gcc bug. * string/string.h (ffsl, ffsll): Prototype. * string/Version (GLIBC_2.1): Add them. * sysdeps/alpha/ffs.S: Schedule for EV5. Add ffsl and ffsll entry points. * sysdeps/alpha/ffsll.S: New file. Empty. * sysdeps/generic/ffs.c: Add ffsl and ffsll entry points. * sysdeps/generic/ffsll.c: New file. * string/Makefile (routines): Add ffsll. 1998-07-30 10:03 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/alpha/bits/time.h: Don't define CLK_TCK for strictly ISO C compliant programs. * sysdeps/unix/sysv/linux/mips/bits/time.h: Likewise. 1998-07-22 Andreas Jaeger <aj@arthur.rhein-neckar.de> * inet/protocols/rwhod.h: Correct typo in comment. * configure.in: Use better regex for gettext.
Diffstat (limited to 'sysdeps/i386/i486/bits/string.h')
| -rw-r--r-- | sysdeps/i386/i486/bits/string.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sysdeps/i386/i486/bits/string.h b/sysdeps/i386/i486/bits/string.h index d4c2eaf715..921c66498e 100644 --- a/sysdeps/i386/i486/bits/string.h +++ b/sysdeps/i386/i486/bits/string.h @@ -1567,6 +1567,25 @@ __strstr_g (__const char *__haystack, __const char *__needle) #endif +/* Bit find functions. We define only the i686 version since for the other + processors gcc generates good code. */ +#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED +# ifdef __i686__ +# define _HAVE_STRING_ARCH_ffs 1 +# define ffs(word) (__builtin_constant_p (word) \ + ? __builtin_ffs (word) \ + : ({ int __cnt, __tmp; \ + __asm__ __volatile__ \ + ("bsfl %2,%0\n\t" \ + "cmovel %1,%0" \ + : "=&r" (__cnt), "=r" (__tmp) \ + : "rm" (word), "1" (-1)); \ + __cnt + 1; })) + +# define ffsl(word) ffs(word) +# endif /* i686 */ +#endif /* BSD || X/Open */ + #undef __STRING_INLINE #endif /* use string inlines && GNU CC */ |