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Add superscalar fletcher4

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This is the Fletcher4 algorithm implemented in pure C, but using
multiple counters using algorithms identical to those used for
SSE/NEON and AVX2.

This allows for faster execution on core with strong superscalar
capabilities but weak SIMD capabilities.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Romain Dolbeau <romain.dolbeau@atos.net>
Closes #5317
This commit is contained in:
Romain Dolbeau
2016-11-04 18:53:03 +01:00
committed by Brian Behlendorf
parent ace1eae84c
commit 7f3194932d
8 changed files with 405 additions and 2 deletions
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module/zcommon/zfs_fletcher.c
+2
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@@ -164,6 +164,8 @@ static fletcher_4_ops_t fletcher_4_fastest_impl = {
static const fletcher_4_ops_t *fletcher_4_impls[] = {
&fletcher_4_scalar_ops,
&fletcher_4_superscalar_ops,
&fletcher_4_superscalar4_ops,
#if defined(HAVE_SSE2)
&fletcher_4_sse2_ops,
#endif