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Grant: Take a look at the one that comes with uClinux for ARM. Ghastly code, but it looks like it should run *really* fast. It basically uses the whole register file, or at least that's what I think it's doing! :^) Oh, it isn't endian-neutral, btw, and I don't remember which endian sense it was written for. That's why I was looking at it in the first place--- I was running in the wrong one... b.g. On Tue, Nov 05, 2002 at 09:47:50AM -0600, Grant Edwards wrote: > On Tue, Nov 05, 2002 at 10:10:24AM +0000, Richard Earnshaw wrote: > > > > Does the ARM back end not know how to do a built-in memcpy? > > > > > > $ arm-elf-gcc -v > > > Reading specs from /usr/local/lib/gcc-lib/arm-elf/2.95.2/specs > > > gcc version 2.95.2 19991024 (release) > > > > The built-in memcpy will only be used if both the memory areas are word > > aligned and the transfer is less than 65 bytes. It doesn't have to be a > > multiple of 4 bytes transferred. > > Ah. Most of the memcpy() calls I'm worried about have > alignments that can't be determined at compile time, so I guess > I'm out of luck. > > The next option is to re-write the memcpy function in assembly > and tweak every last bit of performance out of it I can. > > -- > Grant Edwards > grante@visi.com > > ------ > Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ > Want to unsubscribe? Send a note to crossgcc-unsubscribe@sources.redhat.com > -- Bill Gatliff Public embedded GNU and embedded Linux training dates announced! See http://billgatliff.com for details. ------ Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ Want to unsubscribe? Send a note to crossgcc-unsubscribe@sources.redhat.com
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