Messages in this thread | | | Date | Mon, 11 Dec 2006 06:26:39 +0100 | From | Clemens Koller <> | Subject | Re: optimalisation for strlcpy (lib/string.c) |
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Hi, Adrian & Friends!
>> Like the other patch (by that other person), I think it is faster to not >> do a strlen first.
There are PowerPC architectures, where a strlen is a matter of a single instruction of the CPU.
Quote: "PowerPC 405 and 440 instruction sets offer the powerful Determine Left-Most Zero Byte (DLMZB) instruction."
That's propably hard to beat.
So, if we really want to speed up these things, we should write code which helps the compiler get that optimized instructions for us - by improving the code of strlen() i.e.
Reference: http://www-03.ibm.com/chips/power/powerpc/newsletter/sep2003/ppc_process_at_work2.html
Greets,
Clemens Koller _______________________________ R&D Imaging Devices Anagramm GmbH Rupert-Mayer-Str. 45/1 81379 Muenchen Germany
http://www.anagramm-technology.com Phone: +49-89-741518-50 Fax: +49-89-741518-19
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