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author | David Woodhouse <dwmw2@shinybook.infradead.org> | 2006-04-29 01:42:26 +0100 |
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committer | David Woodhouse <dwmw2@infradead.org> | 2006-04-29 01:42:26 +0100 |
commit | d6754b401a15eaa16492ea5dbaa4826361d3f411 (patch) | |
tree | 032f067d3af458527d903a7653885404ed82431e /include/asm-mips/bitops.h | |
parent | acc429a517bd11fdcac9bea97d082d26231beb92 (diff) | |
parent | 693f7d362055261882659475d2ef022e32edbff1 (diff) | |
download | kernel_samsung_crespo-d6754b401a15eaa16492ea5dbaa4826361d3f411.zip kernel_samsung_crespo-d6754b401a15eaa16492ea5dbaa4826361d3f411.tar.gz kernel_samsung_crespo-d6754b401a15eaa16492ea5dbaa4826361d3f411.tar.bz2 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'include/asm-mips/bitops.h')
-rw-r--r-- | include/asm-mips/bitops.h | 56 |
1 files changed, 24 insertions, 32 deletions
diff --git a/include/asm-mips/bitops.h b/include/asm-mips/bitops.h index 0e71df3..098cec2 100644 --- a/include/asm-mips/bitops.h +++ b/include/asm-mips/bitops.h @@ -466,64 +466,56 @@ static inline unsigned long __ffs(unsigned long word) } /* - * ffs - find first bit set. + * fls - find last bit set. * @word: The word to search * - * Returns 1..SZLONG - * Returns 0 if no bit exists + * This is defined the same way as ffs. + * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. */ - -static inline unsigned long ffs(unsigned long word) +static inline int fls(int word) { - if (!word) - return 0; + __asm__ ("clz %0, %1" : "=r" (word) : "r" (word)); - return __ffs(word) + 1; + return 32 - word; } -/* - * ffz - find first zero in word. - * @word: The word to search - * - * Undefined if no zero exists, so code should check against ~0UL first. - */ -static inline unsigned long ffz(unsigned long word) +#if defined(CONFIG_64BIT) && defined(CONFIG_CPU_MIPS64) +static inline int fls64(__u64 word) { - return __ffs (~word); + __asm__ ("dclz %0, %1" : "=r" (word) : "r" (word)); + + return 64 - word; } +#else +#include <asm-generic/bitops/fls64.h> +#endif /* - * fls - find last bit set. + * ffs - find first bit set. * @word: The word to search * - * Returns 1..SZLONG - * Returns 0 if no bit exists + * This is defined the same way as + * the libc and compiler builtin ffs routines, therefore + * differs in spirit from the above ffz (man ffs). */ -static inline unsigned long fls(unsigned long word) +static inline int ffs(int word) { -#ifdef CONFIG_CPU_MIPS32 - __asm__ ("clz %0, %1" : "=r" (word) : "r" (word)); - - return 32 - word; -#endif - -#ifdef CONFIG_CPU_MIPS64 - __asm__ ("dclz %0, %1" : "=r" (word) : "r" (word)); + if (!word) + return 0; - return 64 - word; -#endif + return fls(word & -word); } #else #include <asm-generic/bitops/__ffs.h> #include <asm-generic/bitops/ffs.h> -#include <asm-generic/bitops/ffz.h> #include <asm-generic/bitops/fls.h> +#include <asm-generic/bitops/fls64.h> #endif /*defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64) */ -#include <asm-generic/bitops/fls64.h> +#include <asm-generic/bitops/ffz.h> #include <asm-generic/bitops/find.h> #ifdef __KERNEL__ |