Messages in this thread | | | Subject | Re: Fast memcpy patch | From | Sasha Levin <> | Date | Wed, 23 Nov 2011 14:10:41 +0200 |
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On Wed, 2011-11-23 at 12:25 +0100, N. Coesel wrote: > Dear readers, > I noticed the Linux kernel still uses a byte-by-byte copy method for > memcpy. Since most memory allocations are aligned to the integer size > of a cpu it is often faster to copy by using the CPU's native word > size. The patch below does that. The code is already at work in many > 16 and 32 bit embedded products. It should also work for 64 bit > platforms. So far I only tested 16 and 32 bit platforms.
[snip]
memcpy (along with other mem* functions) are arch specific - for example, look at arch/x86/lib/memcpy_64.S for the implementation(s) for x86.
The code under lib/string.c is simple and should work on all platforms (and is probably not being used anywhere anymore).
--
Sasha.
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