diff options
| author | Brian Behlendorf <[email protected]> | 2016-06-28 13:31:21 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2016-06-29 11:22:22 -0700 |
| commit | 0dab2e84fcecff2806287efacb7c6205f346f69d (patch) | |
| tree | 4813f9cb944c53140de7a12710f0ca7b12e3ec27 /module | |
| parent | d1d19c785497fafb5e239f67006f534651ed2f27 (diff) | |
Vectorized fletcher_4 must be 128-bit aligned
The fletcher_4_native() and fletcher_4_byteswap() functions may only
safely use the vectorized implementations when the buffer is 128-bit
aligned. This is because both the AVX2 and SSE implementations process
four 32-bit words per iterations. Fallback to the scalar implementation
which only processes a single 32-bit word for unaligned buffers.
Signed-off-by: Brian Behlendorf <[email protected]>
Signed-off-by: Gvozden Neskovic <[email protected]>
Issue #4330
Diffstat (limited to 'module')
| -rw-r--r-- | module/zcommon/zfs_fletcher.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/module/zcommon/zfs_fletcher.c b/module/zcommon/zfs_fletcher.c index 2c2d01d5c..e76c5b8a5 100644 --- a/module/zcommon/zfs_fletcher.c +++ b/module/zcommon/zfs_fletcher.c @@ -334,7 +334,12 @@ fletcher_4_impl_get(void) void fletcher_4_native(const void *buf, uint64_t size, zio_cksum_t *zcp) { - const fletcher_4_ops_t *ops = fletcher_4_impl_get(); + const fletcher_4_ops_t *ops; + + if (IS_P2ALIGNED(size, 4 * sizeof (uint32_t))) + ops = fletcher_4_impl_get(); + else + ops = &fletcher_4_scalar_ops; ops->init(zcp); ops->compute(buf, size, zcp); @@ -345,7 +350,12 @@ fletcher_4_native(const void *buf, uint64_t size, zio_cksum_t *zcp) void fletcher_4_byteswap(const void *buf, uint64_t size, zio_cksum_t *zcp) { - const fletcher_4_ops_t *ops = fletcher_4_impl_get(); + const fletcher_4_ops_t *ops; + + if (IS_P2ALIGNED(size, 4 * sizeof (uint32_t))) + ops = fletcher_4_impl_get(); + else + ops = &fletcher_4_scalar_ops; ops->init(zcp); ops->compute_byteswap(buf, size, zcp); |