| /* |
| * 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/param.h> |
| #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" |
| }; |