linux-kernel - Re: [PATCH v3 26/31] arm64: Miscellaneous library functions

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Message-Id: <201209071952.14309.arnd@arndb.de>
Date:	Fri, 7 Sep 2012 19:52:13 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 26/31] arm64: Miscellaneous library functions

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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