tree 4077ad30a801a6e7dcc0b915612e2c815239fd9b
parent 151f25112ff7befc134ed3fc58b0ff8792b3169e
author Anton Blanchard <anton@samba.org> 1467325185 +1000
committer Herbert Xu <herbert@gondor.apana.org.au> 1467731119 +0800

crypto: powerpc - Add POWER8 optimised crc32c

Use the vector polynomial multiply-sum instructions in POWER8 to
speed up crc32c.

This is just over 41x faster than the slice-by-8 method that it
replaces. Measurements on a 4.1 GHz POWER8 show it sustaining
52 GiB/sec.

A simple btrfs write performance test:

    dd if=/dev/zero of=/mnt/tmpfile bs=1M count=4096
    sync

is over 3.7x faster.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>