PATCH: Altivec support for RAID-6

[H. Peter Anvin]

This patch allows the RAID-6 code to use Altivec on ppc/ppc64 
processors.  Note that it uses gcc <altivec.h> support, so it might 
require a fairly recent gcc -- but I haven't been able to get a clear 
answer on *how* new.

It also changes -mcpu=power4 to -mcpu=970 when CONFIG_ALTIVEC is 
enabled, since -mcpu=power4 doesn't allow -maltivec to be specified with 
it :(

The results are *impressive*, however; on a PowerMac G5 I get 6.1 GB/s 
(on one CPU!); this is close to the 7.8 GB/s for RAID-5, and almost 2x 
what my 3 GHz Pentium4 gets.

	-hpa


Signed-Off-By: H. Peter Anvin <hpa at zytor.com>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: raid6altivec.diff
Type: text/x-patch
Size: 7285 bytes
Desc: not available
Url : http://ozlabs.org/pipermail/linuxppc64-dev/attachments/20041030/65ffa544/attachment.bin