From: Tony Finch <dot@dotat.at>
Date: Fri, 01 May 2009 17:42:38 GMT
Subject: Re: Why Git is so fast
Message-ID: <alpine.LSU.2.00.0905011840260.28199@hermes-2.csi.cam.ac.uk>
In-Reply-To: <8663gllt88.fsf@broadpark.no>

On Thu, 30 Apr 2009, Kjetil Barvik wrote:
>
>   I admit that I am not particular familar with intel machine
>   instructions, but I guess that the above 10 mov instructions is the
>   result for the compiled inline hashcpy() in the write_sha1_file()
>   function in sha1_file.c
>
>   Question: would it be possible for the compiler to compile it down to
>   just 5 mov instructions if we had used unsigned 32 bits type?

No, because the x86 can't do direct memory-to-memory moves.

Tony.
-- 
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