linux-kernel - Re: [PATCH v2] qnx4: Use hweight8

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Date:	Fri, 13 Nov 2009 11:11:53 +0100
From:	Anders Larsen <al@...rsen.net>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Akinobu Mita <akinobu.mita@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v2] qnx4: Use hweight8

On 2009-11-13 10:57:45, Akinobu Mita wrote:
> Oops,
> 
> Subject: [PATCH v2] qnx4: Use hweight8
> 
> Use hweight8 instead of counting for each bit
> 
> [ v2: count_bit() counts zero bits in the bitmap]
> 
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
> Cc: Anders Larsen <al@...rsen.net>
> Cc: Al Viro <viro@...iv.linux.org.uk>

Acked-by: Anders Larsen <al@...rsen.net>

> ---
>  fs/qnx4/bitmap.c |   17 +----------------
>  1 files changed, 1 insertions(+), 16 deletions(-)
> 
> diff --git a/fs/qnx4/bitmap.c b/fs/qnx4/bitmap.c
> index 0afba06..cbaae72 100644
> --- a/fs/qnx4/bitmap.c
> +++ b/fs/qnx4/bitmap.c
> @@ -35,22 +35,7 @@ static void count_bits(register const char *bmPart, register int size,
>  	}
>  	do {
>  		b = *bmPart++;
> -		if ((b & 1) == 0)
> -			tot++;
> -		if ((b & 2) == 0)
> -			tot++;
> -		if ((b & 4) == 0)
> -			tot++;
> -		if ((b & 8) == 0)
> -			tot++;
> -		if ((b & 16) == 0)
> -			tot++;
> -		if ((b & 32) == 0)
> -			tot++;
> -		if ((b & 64) == 0)
> -			tot++;
> -		if ((b & 128) == 0)
> -			tot++;
> +		tot += 8 - hweight8(b);
>  		size--;
>  	} while (size != 0);
>  	*tf = tot;
> -- 
> 1.6.5.1

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