linux-kernel - Re: [RFC PATCH] lib/vsprintf.c: Simplify uuid

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Date:	Mon, 11 May 2015 09:49:23 -0700
From:	Joe Perches <joe@...ches.com>
To:	George Spelvin <linux@...izon.com>
Cc:	linux@...musvillemoes.dk, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] lib/vsprintf.c: Simplify uuid_string()

On Mon, 2015-05-11 at 12:32 -0400, George Spelvin wrote:
> I suspect it's a speedup, but since this is not hot code, the important
> part is that it shrinks the function from 332 to 256 bytes.

shrinking code in vsprintf is always good

> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
[]
>  	for (i = 0; i < 16; i++) {
> -		p = hex_byte_pack(p, addr[index[i]]);
> +		u8 byte = addr[index[i]];
> +		*p++ = hex[x >> 4];
> +		*p++ = hex[x & 0x0f];

?
		*p++ = hex[byte >> 4];
		*p++ = hex[byte & 0x0f];


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