24cdeaf12e
This is not useful on micro-architecture with a weak NEON implementation (only 64 bits); the native version is slower & the byteswap barely faster than scalar. On A53 or A57, it's a small improvement on scalar but OK for byteswap. Results from an A53 system: 0 0 0x01 -1 0 1499068294333000 1499101101878000 implementation native byteswap scalar 1008227510 755880264 aarch64_neon 1198098720 1044818671 fastest aarch64_neon aarch64_neon Results from a A57 system: 0 0 0x01 -1 0 4407214734807033 4407233933777404 implementation native byteswap scalar 2302071241 1124873346 aarch64_neon 2542214946 2245570352 fastest aarch64_neon aarch64_neon Reviewed-by: Gvozden Neskovic <neskovic@gmail.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Romain Dolbeau <romain.dolbeau@atos.net> Closes #5248
147 lines
4.2 KiB
C
147 lines
4.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright 2013 Saso Kiselkov. All rights reserved.
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*/
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#ifndef _ZFS_FLETCHER_H
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#define _ZFS_FLETCHER_H
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#include <sys/types.h>
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#include <sys/spa_checksum.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* fletcher checksum functions
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*
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* Note: Fletcher checksum methods expect buffer size to be 4B aligned. This
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* limitation stems from the algorithm design. Performing incremental checksum
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* without said alignment would yield different results. Therefore, the code
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* includes assertions for the size alignment.
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* For compatibility, it is required that some code paths calculate checksum of
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* non-aligned buffer sizes. For this purpose, `fletcher_4_native_varsize()`
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* checksum method is added. This method will ignore last (size % 4) bytes of
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* the data buffer.
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*/
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void fletcher_2_native(const void *, uint64_t, const void *, zio_cksum_t *);
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void fletcher_2_byteswap(const void *, uint64_t, const void *, zio_cksum_t *);
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void fletcher_4_native(const void *, uint64_t, const void *, zio_cksum_t *);
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void fletcher_4_native_varsize(const void *, uint64_t, zio_cksum_t *);
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void fletcher_4_byteswap(const void *, uint64_t, const void *, zio_cksum_t *);
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void fletcher_4_incremental_native(const void *, uint64_t,
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zio_cksum_t *);
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void fletcher_4_incremental_byteswap(const void *, uint64_t,
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zio_cksum_t *);
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int fletcher_4_impl_set(const char *selector);
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void fletcher_4_init(void);
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void fletcher_4_fini(void);
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/* Internal fletcher ctx */
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typedef struct zfs_fletcher_sse {
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uint64_t v[2] __attribute__((aligned(16)));
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} zfs_fletcher_sse_t;
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typedef struct zfs_fletcher_avx {
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uint64_t v[4] __attribute__((aligned(32)));
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} zfs_fletcher_avx_t;
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typedef struct zfs_fletcher_avx512 {
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uint64_t v[8] __attribute__((aligned(64)));
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} zfs_fletcher_avx512_t;
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typedef struct zfs_fletcher_aarch64_neon {
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uint64_t v[2] __attribute__((aligned(16)));
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} zfs_fletcher_aarch64_neon_t;
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typedef union fletcher_4_ctx {
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zio_cksum_t scalar;
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#if defined(HAVE_SSE2) || (defined(HAVE_SSE2) && defined(HAVE_SSSE3))
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zfs_fletcher_sse_t sse[4];
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#endif
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#if defined(HAVE_AVX) && defined(HAVE_AVX2)
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zfs_fletcher_avx_t avx[4];
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#endif
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#if defined(__x86_64) && defined(HAVE_AVX512F)
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zfs_fletcher_avx512_t avx512[4];
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#endif
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#if defined(__aarch64__)
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zfs_fletcher_aarch64_neon_t aarch64_neon[4];
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#endif
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} fletcher_4_ctx_t;
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/*
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* fletcher checksum struct
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*/
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typedef void (*fletcher_4_init_f)(fletcher_4_ctx_t *);
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typedef void (*fletcher_4_fini_f)(fletcher_4_ctx_t *, zio_cksum_t *);
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typedef void (*fletcher_4_compute_f)(fletcher_4_ctx_t *,
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const void *, uint64_t);
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typedef struct fletcher_4_func {
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fletcher_4_init_f init_native;
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fletcher_4_fini_f fini_native;
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fletcher_4_compute_f compute_native;
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fletcher_4_init_f init_byteswap;
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fletcher_4_fini_f fini_byteswap;
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fletcher_4_compute_f compute_byteswap;
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boolean_t (*valid)(void);
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const char *name;
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} fletcher_4_ops_t;
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#if defined(HAVE_SSE2)
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extern const fletcher_4_ops_t fletcher_4_sse2_ops;
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#endif
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#if defined(HAVE_SSE2) && defined(HAVE_SSSE3)
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extern const fletcher_4_ops_t fletcher_4_ssse3_ops;
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#endif
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#if defined(HAVE_AVX) && defined(HAVE_AVX2)
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extern const fletcher_4_ops_t fletcher_4_avx2_ops;
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#endif
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#if defined(__x86_64) && defined(HAVE_AVX512F)
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extern const fletcher_4_ops_t fletcher_4_avx512f_ops;
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#endif
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#if defined(__aarch64__)
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extern const fletcher_4_ops_t fletcher_4_aarch64_neon_ops;
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ZFS_FLETCHER_H */
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