From: Linus Torvalds <torvalds@osdl.org>
Date: Mon, 13 Mar 2006 01:31:39 GMT
Subject: Re: git-diff-tree -M performance regression in 'next'
Message-ID: <Pine.LNX.4.64.0603121730310.3618@g5.osdl.org>
In-Reply-To: <Pine.LNX.4.64.0603121710110.3618@g5.osdl.org>



On Sun, 12 Mar 2006, Linus Torvalds wrote:
>
> 	u64 value = *(u64 *)src;
> 	src += 8;
> 	hash = value % 4294967291u;

Btw, this assumes the "only hash every 8 bytes" at the source, in which 
case this is ok even on architectures that need aligned reads. For the 
non-aligned reads, you'd need your "shift the value" approach.

		Linus