diff options
Diffstat (limited to 'arch/x86/include/asm/bitops.h')
| -rw-r--r-- | arch/x86/include/asm/bitops.h | 19 |
1 files changed, 2 insertions, 17 deletions
diff --git a/arch/x86/include/asm/bitops.h b/arch/x86/include/asm/bitops.h index b2af6645ea7e..6dfd0195bb55 100644 --- a/arch/x86/include/asm/bitops.h +++ b/arch/x86/include/asm/bitops.h @@ -347,19 +347,6 @@ static int test_bit(int nr, const volatile unsigned long *addr); ? constant_test_bit((nr), (addr)) \ : variable_test_bit((nr), (addr))) -#if (defined(CONFIG_X86_GENERIC) || defined(CONFIG_GENERIC_CPU)) \ - && !defined(CONFIG_CC_OPTIMIZE_FOR_SIZE) -/* - * Since BSF and TZCNT have sufficiently similar semantics for the purposes - * for which we use them here, BMI-capable hardware will decode the prefixed - * variant as 'tzcnt ...' and may execute that faster than 'bsf ...', while - * older hardware will ignore the REP prefix and decode it as 'bsf ...'. - */ -# define BSF_PREFIX "rep;" -#else -# define BSF_PREFIX -#endif - /** * __ffs - find first set bit in word * @word: The word to search @@ -368,7 +355,7 @@ static int test_bit(int nr, const volatile unsigned long *addr); */ static inline unsigned long __ffs(unsigned long word) { - asm(BSF_PREFIX "bsf %1,%0" + asm("rep; bsf %1,%0" : "=r" (word) : "rm" (word)); return word; @@ -382,14 +369,12 @@ static inline unsigned long __ffs(unsigned long word) */ static inline unsigned long ffz(unsigned long word) { - asm(BSF_PREFIX "bsf %1,%0" + asm("rep; bsf %1,%0" : "=r" (word) : "r" (~word)); return word; } -#undef BSF_PREFIX - /* * __fls: find last set bit in word * @word: The word to search |