Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH v3 26/31] arm64: Miscellaneous library functions | Date | Fri, 7 Sep 2012 19:52:13 +0000 |
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On Friday 07 September 2012, Catalin Marinas wrote:
> +/* > + * Use compiler builtins for simple inline operations. > + */ > +static inline unsigned long __ffs(unsigned long word) > +{ > + return __builtin_ffsl(word) - 1; > +} > + > +static inline int ffs(int x) > +{ > + return __builtin_ffs(x); > +} > + > +static inline unsigned long __fls(unsigned long word) > +{ > + return BITS_PER_LONG - 1 - __builtin_clzl(word); > +} > + > +static inline int fls(int x) > +{ > + return x ? sizeof(x) * BITS_PER_BYTE - __builtin_clz(x) : 0; > +}
Still waiting for the generic version of these.
Arnd
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