On Thursday 19 June 2008, Mark Nelson wrote:
> .align 7
> _GLOBAL(copy_4K_page)
> dcbt 0,r4 /* Prefetch ONE SRC cacheline */
>
> addi r6,r3,-8 /* prepare for stdu */
> addi r4,r4,-8 /* prepare for ldu */
>
> li r10,32 /* copy 32 cache lines for a 4K page */
> li r12,128+8 /* prefetch distance*/
Since you have a loop here anyway instead of the fully unrolled
code, why not provide a copy_64K_page function as well, jumping in
here?
The inline 64k copy_page function otherwise just adds code size,
as well as being a tiny bit slower. It may even be good to
have an out-of-line copy_64K_page for the regular code, just
calling copy_4K_page repeatedly.
Arnd <><
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