162 lines
4.8 KiB
C
162 lines
4.8 KiB
C
/*
|
|
* Implement fast Fletcher4 using superscalar pipelines.
|
|
*
|
|
* Use regular C code to compute
|
|
* Fletcher4 in two incremental 64-bit parallel accumulator streams,
|
|
* and then combine the streams to form the final four checksum words.
|
|
* This implementation is a derivative of the AVX SIMD implementation by
|
|
* James Guilford and Jinshan Xiong from Intel (see zfs_fletcher_intel.c).
|
|
*
|
|
* Copyright (C) 2016 Romain Dolbeau.
|
|
*
|
|
* Authors:
|
|
* Romain Dolbeau <romain.dolbeau@atos.net>
|
|
*
|
|
* This software is available to you under a choice of one of two
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
|
* General Public License (GPL) Version 2, available from the file
|
|
* COPYING in the main directory of this source tree, or the
|
|
* OpenIB.org BSD license below:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#include <sys/byteorder.h>
|
|
#include <sys/spa_checksum.h>
|
|
#include <sys/strings.h>
|
|
#include <zfs_fletcher.h>
|
|
|
|
static void
|
|
fletcher_4_superscalar_init(fletcher_4_ctx_t *ctx)
|
|
{
|
|
bzero(ctx->superscalar, 4 * sizeof (zfs_fletcher_superscalar_t));
|
|
}
|
|
|
|
static void
|
|
fletcher_4_superscalar_fini(fletcher_4_ctx_t *ctx, zio_cksum_t *zcp)
|
|
{
|
|
uint64_t A, B, C, D;
|
|
A = ctx->superscalar[0].v[0] + ctx->superscalar[0].v[1];
|
|
B = 2 * ctx->superscalar[1].v[0] + 2 * ctx->superscalar[1].v[1] -
|
|
ctx->superscalar[0].v[1];
|
|
C = 4 * ctx->superscalar[2].v[0] - ctx->superscalar[1].v[0] +
|
|
4 * ctx->superscalar[2].v[1] - 3 * ctx->superscalar[1].v[1];
|
|
D = 8 * ctx->superscalar[3].v[0] - 4 * ctx->superscalar[2].v[0] +
|
|
8 * ctx->superscalar[3].v[1] - 8 * ctx->superscalar[2].v[1] +
|
|
ctx->superscalar[1].v[1];
|
|
ZIO_SET_CHECKSUM(zcp, A, B, C, D);
|
|
}
|
|
|
|
static void
|
|
fletcher_4_superscalar_native(fletcher_4_ctx_t *ctx,
|
|
const void *buf, uint64_t size)
|
|
{
|
|
const uint32_t *ip = buf;
|
|
const uint32_t *ipend = ip + (size / sizeof (uint32_t));
|
|
uint64_t a, b, c, d;
|
|
uint64_t a2, b2, c2, d2;
|
|
|
|
a = ctx->superscalar[0].v[0];
|
|
b = ctx->superscalar[1].v[0];
|
|
c = ctx->superscalar[2].v[0];
|
|
d = ctx->superscalar[3].v[0];
|
|
a2 = ctx->superscalar[0].v[1];
|
|
b2 = ctx->superscalar[1].v[1];
|
|
c2 = ctx->superscalar[2].v[1];
|
|
d2 = ctx->superscalar[3].v[1];
|
|
|
|
for (; ip < ipend; ip += 2) {
|
|
a += ip[0];
|
|
a2 += ip[1];
|
|
b += a;
|
|
b2 += a2;
|
|
c += b;
|
|
c2 += b2;
|
|
d += c;
|
|
d2 += c2;
|
|
}
|
|
|
|
ctx->superscalar[0].v[0] = a;
|
|
ctx->superscalar[1].v[0] = b;
|
|
ctx->superscalar[2].v[0] = c;
|
|
ctx->superscalar[3].v[0] = d;
|
|
ctx->superscalar[0].v[1] = a2;
|
|
ctx->superscalar[1].v[1] = b2;
|
|
ctx->superscalar[2].v[1] = c2;
|
|
ctx->superscalar[3].v[1] = d2;
|
|
}
|
|
|
|
static void
|
|
fletcher_4_superscalar_byteswap(fletcher_4_ctx_t *ctx,
|
|
const void *buf, uint64_t size)
|
|
{
|
|
const uint32_t *ip = buf;
|
|
const uint32_t *ipend = ip + (size / sizeof (uint32_t));
|
|
uint64_t a, b, c, d;
|
|
uint64_t a2, b2, c2, d2;
|
|
|
|
a = ctx->superscalar[0].v[0];
|
|
b = ctx->superscalar[1].v[0];
|
|
c = ctx->superscalar[2].v[0];
|
|
d = ctx->superscalar[3].v[0];
|
|
a2 = ctx->superscalar[0].v[1];
|
|
b2 = ctx->superscalar[1].v[1];
|
|
c2 = ctx->superscalar[2].v[1];
|
|
d2 = ctx->superscalar[3].v[1];
|
|
|
|
for (; ip < ipend; ip += 2) {
|
|
a += BSWAP_32(ip[0]);
|
|
a2 += BSWAP_32(ip[1]);
|
|
b += a;
|
|
b2 += a2;
|
|
c += b;
|
|
c2 += b2;
|
|
d += c;
|
|
d2 += c2;
|
|
}
|
|
|
|
ctx->superscalar[0].v[0] = a;
|
|
ctx->superscalar[1].v[0] = b;
|
|
ctx->superscalar[2].v[0] = c;
|
|
ctx->superscalar[3].v[0] = d;
|
|
ctx->superscalar[0].v[1] = a2;
|
|
ctx->superscalar[1].v[1] = b2;
|
|
ctx->superscalar[2].v[1] = c2;
|
|
ctx->superscalar[3].v[1] = d2;
|
|
}
|
|
|
|
static boolean_t fletcher_4_superscalar_valid(void)
|
|
{
|
|
return (B_TRUE);
|
|
}
|
|
|
|
const fletcher_4_ops_t fletcher_4_superscalar_ops = {
|
|
.init_native = fletcher_4_superscalar_init,
|
|
.compute_native = fletcher_4_superscalar_native,
|
|
.fini_native = fletcher_4_superscalar_fini,
|
|
.init_byteswap = fletcher_4_superscalar_init,
|
|
.compute_byteswap = fletcher_4_superscalar_byteswap,
|
|
.fini_byteswap = fletcher_4_superscalar_fini,
|
|
.valid = fletcher_4_superscalar_valid,
|
|
.name = "superscalar"
|
|
};
|