[PATCH] crc32 improvements
Patch from Joakim Tjernlund <joakim.tjernlund@lumentis.se> I did the optimizations in the crc32 patch Brian Murphy submitted a while ago. Now I have cleaned it up a little and made some more optimizations. gcc is quite bad at loop optimizations (at least for PPC) so I have rewritten them to make gcc to generate better code. Even recent gcc's(3.2.x) produces better code. Also reduced the unrolling since it did not make a noticeable difference.
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