tree 32ebba9cfc1b00d1f394b480d5cfab443382864e
parent 48821a34b1bdc5d89505cb814b3f7c166940f200
author Christophe Leroy <christophe.leroy@c-s.fr> 1442932472 +0200
committer Scott Wood <oss@buserror.net> 1457154225 -0600

powerpc32: optimise csum_partial() loop

On the 8xx, load latency is 2 cycles and taking branches also takes
2 cycles. So let's unroll the loop.

This patch improves csum_partial() speed by around 10% on both:
* 8xx (single issue processor with parallel execution)
* 83xx (superscalar 6xx processor with dual instruction fetch
and parallel execution)

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>