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Faster crc32c

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Kent Overstreet 2017-05-16 21:16:31 -08:00
parent b1814f2dd0
commit e7c2bb91bc
8 changed files with 155 additions and 806 deletions
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4
Makefile
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@ -19,10 +19,6 @@ CC_VERSION=$(shell $(CC) -v 2>&1|grep -E '(gcc|clang) version')
ifneq (,$(findstring gcc,$(CC_VERSION)))
CFLAGS+=-Wno-unused-but-set-variable
ifndef D
CFLAGS+=-flto
LDFLAGS+=-flto
endif
endif
ifneq (,$(findstring clang,$(CC_VERSION)))

339
ccan/crc/LICENSE
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@ -1,339 +0,0 @@
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46
ccan/crc/_info
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@ -1,46 +0,0 @@
#include "config.h"
#include <string.h>
#include <stdio.h>
/**
* crc - routines for crc of bytes
*
* Cyclic Redundancy Check routines. These are reasonably fast
* checksum routines, but not suitable for cryptographic use.
*
* They are useful for simple error detection, eg. a 32-bit CRC will
* detect a single error burst of up to 32 bits.
*
* Example:
* #include <ccan/crc/crc.h>
* #include <stdio.h>
* #include <stdlib.h>
*
* // Given "IHATEMATH" outputs 0x98a3b8df
* int main(int argc, char *argv[])
* {
* if (argc != 2) {
* fprintf(stderr, "Usage: %s <string>\n"
* "Prints 32 bit CRC of the string\n", argv[0]);
* exit(1);
* }
* printf("0x%08x\n", crc32c(0, argv[1], strlen(argv[1])));
* exit(0);
* }
*
* License: GPL (v2 or any later version)
* Author: Gary S. Brown, Clay Haapala
* Maintainer: Rusty Russell <rusty@rustcorp.com.au>
*/
int main(int argc, char *argv[])
{
if (argc != 2)
return 1;
if (strcmp(argv[1], "depends") == 0) {
printf("ccan/array_size\n");
return 0;
}
return 1;
}

307
ccan/crc/crc.c
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@ -1,307 +0,0 @@
/* crc32_ieee code:
* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or
* code or tables extracted from it, as desired without restriction.
*/
/* crc32c code taken from 2.6.29 Linux kernel crypto/crc32c.c:
* Copyright (c) 2004 Cisco Systems, Inc.
* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version. */
/* crc64 code taken from Jacksum version 1.7.0 - checksum utility in Java
* E-mail: jonelo@jonelo.de
* Copyright (C) 2001-2006 Dipl.-Inf. (FH) Johann Nepomuk Loefflmann,
* All Rights Reserved, http://www.jonelo.de
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*/
#include "crc.h"
#include <ccan/array_size/array_size.h>
#include <stdbool.h>
#include <stdlib.h>
/*
* This is the CRC-32C table
* Generated with:
* width = 32 bits
* poly = 0x1EDC6F41
* reflect input bytes = true
* reflect output bytes = true
*/
static const uint32_t crc32c_tab[] = {
0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4,
0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB,
0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B,
0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24,
0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B,
0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384,
0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54,
0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B,
0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A,
0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35,
0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5,
0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA,
0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45,
0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A,
0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A,
0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595,
0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48,
0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957,
0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687,
0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198,
0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927,
0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38,
0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8,
0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7,
0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096,
0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789,
0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859,
0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46,
0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9,
0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6,
0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36,
0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829,
0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C,
0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93,
0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043,
0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C,
0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3,
0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC,
0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C,
0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033,
0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652,
0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D,
0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D,
0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982,
0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D,
0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622,
0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2,
0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED,
0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530,
0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F,
0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF,
0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0,
0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F,
0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540,
0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90,
0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F,
0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE,
0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1,
0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321,
0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E,
0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81,
0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E,
0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351
};
/*
* Steps through buffer one byte at at time, calculates reflected
* crc using table.
*/
uint32_t crc32c(uint32_t crc, const void *buf, size_t size)
{
const uint8_t *p = buf;
while (size--)
crc = crc32c_tab[(crc ^ *p++) & 0xFFL] ^ (crc >> 8);
return crc;
}
const uint32_t *crc32c_table(void)
{
return crc32c_tab;
}
static const uint32_t crc32_ieee_tab[] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};
uint32_t crc32_ieee(uint32_t crc, const void *buf, size_t size)
{
const uint8_t *p;
p = buf;
crc ^= ~0U;
while (size--)
crc = crc32_ieee_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
return crc ^ ~0U;
}
const uint32_t *crc32_ieee_table(void)
{
return crc32_ieee_tab;
}
/* We only keep the upper 16 bits of the table: the lower 48 are always 0 */
static uint16_t crc64_tab[] = {
0x0000, 0x01b0, 0x0360,
0x02d0, 0x06c0, 0x0770,
0x05a0, 0x0410, 0x0d80,
0x0c30, 0x0ee0, 0x0f50,
0x0b40, 0x0af0, 0x0820,
0x0990, 0x1b00, 0x1ab0,
0x1860, 0x19d0, 0x1dc0,
0x1c70, 0x1ea0, 0x1f10,
0x1680, 0x1730, 0x15e0,
0x1450, 0x1040, 0x11f0,
0x1320, 0x1290, 0x3600,
0x37b0, 0x3560, 0x34d0,
0x30c0, 0x3170, 0x33a0,
0x3210, 0x3b80, 0x3a30,
0x38e0, 0x3950, 0x3d40,
0x3cf0, 0x3e20, 0x3f90,
0x2d00, 0x2cb0, 0x2e60,
0x2fd0, 0x2bc0, 0x2a70,
0x28a0, 0x2910, 0x2080,
0x2130, 0x23e0, 0x2250,
0x2640, 0x27f0, 0x2520,
0x2490, 0x6c00, 0x6db0,
0x6f60, 0x6ed0, 0x6ac0,
0x6b70, 0x69a0, 0x6810,
0x6180, 0x6030, 0x62e0,
0x6350, 0x6740, 0x66f0,
0x6420, 0x6590, 0x7700,
0x76b0, 0x7460, 0x75d0,
0x71c0, 0x7070, 0x72a0,
0x7310, 0x7a80, 0x7b30,
0x79e0, 0x7850, 0x7c40,
0x7df0, 0x7f20, 0x7e90,
0x5a00, 0x5bb0, 0x5960,
0x58d0, 0x5cc0, 0x5d70,
0x5fa0, 0x5e10, 0x5780,
0x5630, 0x54e0, 0x5550,
0x5140, 0x50f0, 0x5220,
0x5390, 0x4100, 0x40b0,
0x4260, 0x43d0, 0x47c0,
0x4670, 0x44a0, 0x4510,
0x4c80, 0x4d30, 0x4fe0,
0x4e50, 0x4a40, 0x4bf0,
0x4920, 0x4890, 0xd800,
0xd9b0, 0xdb60, 0xdad0,
0xdec0, 0xdf70, 0xdda0,
0xdc10, 0xd580, 0xd430,
0xd6e0, 0xd750, 0xd340,
0xd2f0, 0xd020, 0xd190,
0xc300, 0xc2b0, 0xc060,
0xc1d0, 0xc5c0, 0xc470,
0xc6a0, 0xc710, 0xce80,
0xcf30, 0xcde0, 0xcc50,
0xc840, 0xc9f0, 0xcb20,
0xca90, 0xee00, 0xefb0,
0xed60, 0xecd0, 0xe8c0,
0xe970, 0xeba0, 0xea10,
0xe380, 0xe230, 0xe0e0,
0xe150, 0xe540, 0xe4f0,
0xe620, 0xe790, 0xf500,
0xf4b0, 0xf660, 0xf7d0,
0xf3c0, 0xf270, 0xf0a0,
0xf110, 0xf880, 0xf930,
0xfbe0, 0xfa50, 0xfe40,
0xfff0, 0xfd20, 0xfc90,
0xb400, 0xb5b0, 0xb760,
0xb6d0, 0xb2c0, 0xb370,
0xb1a0, 0xb010, 0xb980,
0xb830, 0xbae0, 0xbb50,
0xbf40, 0xbef0, 0xbc20,
0xbd90, 0xaf00, 0xaeb0,
0xac60, 0xadd0, 0xa9c0,
0xa870, 0xaaa0, 0xab10,
0xa280, 0xa330, 0xa1e0,
0xa050, 0xa440, 0xa5f0,
0xa720, 0xa690, 0x8200,
0x83b0, 0x8160, 0x80d0,
0x84c0, 0x8570, 0x87a0,
0x8610, 0x8f80, 0x8e30,
0x8ce0, 0x8d50, 0x8940,
0x88f0, 0x8a20, 0x8b90,
0x9900, 0x98b0, 0x9a60,
0x9bd0, 0x9fc0, 0x9e70,
0x9ca0, 0x9d10, 0x9480,
0x9530, 0x97e0, 0x9650,
0x9240, 0x93f0, 0x9120,
0x9090
};
uint64_t crc64_iso(uint64_t crc, const void *buf, size_t size)
{
const uint8_t *p = buf;
while (size--) {
uint64_t tabval = crc64_tab[(crc ^ *p++) & 0xFFL];
tabval <<= 48;
crc = tabval ^ (crc >> 8);
}
return crc;
}
const uint64_t *crc64_iso_table(void)
{
static uint64_t *fulltab = NULL;
unsigned int i;
if (fulltab)
return fulltab;
fulltab = malloc(sizeof(uint64_t)*ARRAY_SIZE(crc64_tab));
if (!fulltab)
return NULL;
for (i = 0; i < ARRAY_SIZE(crc64_tab); i++)
fulltab[i] = (uint64_t)crc64_tab[i] << 48;
return fulltab;
}

107
ccan/crc/crc.h
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@ -1,107 +0,0 @@
/* Licensed under GPLv2+ - see LICENSE file for details */
#ifndef CCAN_CRC_H
#define CCAN_CRC_H
#include <stdint.h>
#include <stdlib.h>
/**
* crc32c - Castagnoli 32 bit crc of string of bytes
* @start_crc: the initial crc (usually 0)
* @buf: pointer to bytes
* @size: length of buffer
*
* If you don't know what crc32 to use, use this one: it's the best.
*
* @Article{castagnoli-crc,
* author = { Guy Castagnoli and Stefan Braeuer and Martin Herrman},
* title = {{Optimization of Cyclic Redundancy-Check Codes with 24
* and 32 Parity Bits}},
* journal = IEEE Transactions on Communication,
* year = {1993},
* volume = {41},
* number = {6},
* pages = {},
* month = {June},
*}
* 32 bit CRC checksum using polynomial
* X^32+X^28+X^27+X^26+X^25+X^23+X^22+X^20+X^19+X^18+X^14+X^13+X^11+X^10+X^9+X^8+X^6+X^0.
*
* You can calculate the CRC of non-contiguous arrays by passing @start_crc
* as 0 the first time, and the current crc result from then on.
*
* Example:
* #include <sys/uio.h>
* ...
* // Check that iovec has the crc we expect (Castagnoli version)
* static bool check_crc(uint32_t expected, const struct iovec *iov, int l)
* {
* uint32_t crc = 0;
* while (l >= 0) {
* crc = crc32c(crc, iov->iov_base, iov->iov_len);
* iov++;
* }
* return crc == expected;
* }
*/
uint32_t crc32c(uint32_t start_crc, const void *buf, size_t size);
/**
* crc32c_table - Get the Castagnoli CRC table
*
* For special effects, you might want direct access to the table; this is
* the standard 256-entry table for this algorithm.
*
* In theory, this might need to malloc(), and thus return NULL.
*
* Example:
* // This dumb code only handles Castagnoli, so assert that here.
* static void check_user_crc_table(const uint32_t *usertab)
* {
* const uint32_t *ctab = crc32c_table();
* if (!ctab || memcmp(ctab, usertab, 1024) != 0)
* abort();
* }
*/
const uint32_t *crc32c_table(void);
/**
* crc32_ieee - IEEE 802.3 32 bit crc of string of bytes
* @start_crc: the initial crc (usually 0)
* @buf: pointer to bytes
* @size: length of buffer
*
* 32 bit CRC checksum using polynomial
* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0.
*
* See crc32c() for details.
*/
uint32_t crc32_ieee(uint32_t start_crc, const void *buf, size_t size);
/**
* crc32_ieee_table - Get the IEEE 802.3 CRC table
*
* See crc32c_table() for details.
*/
const uint32_t *crc32_ieee_table(void);
/**
* crc64_iso - ISO 3309
* @start_crc: the initial crc (usually 0)
* @buf: pointer to bytes
* @size: length of buffer
*
* 64 bit CRC checksum using polynomial
* X^64 + X^4 + X^3 + X^1 + X^0
*
* See crc32c() for details.
*/
uint64_t crc64_iso(uint64_t start_crc, const void *buf, size_t size);
/**
* crc64_iso_table - Get the ISO 3309 CRC table
*
* See crc32c_table() for details.
*/
const uint64_t *crc64_iso_table(void);
#endif /* CCAN_CRC_H */

2
include/linux/crc32c.h
View File

@ -1,6 +1,6 @@
#ifndef _LINUX_CRC32C_H
#define _LINUX_CRC32C_H
#include "../../ccan/crc/crc.h"
#include "tools-util.h"
#endif /* _LINUX_CRC32C_H */

154
tools-util.c
View File

@ -16,8 +16,6 @@
#include <blkid.h>
#include <uuid/uuid.h>
#include "ccan/crc/crc.h"
#include "bcachefs_ioctl.h"
#include "linux/sort.h"
#include "tools-util.h"
@ -416,3 +414,155 @@ unsigned hatoi_validate(const char *s, const char *msg)
return v;
}
/* crc32c */
static u32 crc32c_default(u32 crc, const void *buf, size_t size)
{
static const u32 crc32c_tab[] = {
0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4,
0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB,
0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B,
0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24,
0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B,
0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384,
0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54,
0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B,
0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A,
0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35,
0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5,
0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA,
0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45,
0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A,
0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A,
0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595,
0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48,
0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957,
0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687,
0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198,
0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927,
0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38,
0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8,
0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7,
0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096,
0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789,
0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859,
0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46,
0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9,
0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6,
0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36,
0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829,
0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C,
0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93,
0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043,
0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C,
0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3,
0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC,
0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C,
0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033,
0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652,
0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D,
0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D,
0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982,
0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D,
0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622,
0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2,
0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED,
0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530,
0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F,
0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF,
0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0,
0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F,
0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540,
0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90,
0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F,
0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE,
0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1,
0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321,
0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E,
0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81,
0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E,
0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351
};
const u8 *p = buf;
while (size--)
crc = crc32c_tab[(crc ^ *p++) & 0xFFL] ^ (crc >> 8);
return crc;
}
#include <linux/compiler.h>
#ifdef __x86_64__
#ifdef CONFIG_X86_64
#define REX_PRE "0x48, "
#else
#define REX_PRE
#endif
static u32 crc32c_sse42(u32 crc, const void *buf, size_t size)
{
while (size >= sizeof(long)) {
const unsigned long *d = buf;
__asm__ __volatile__(
".byte 0xf2, " REX_PRE "0xf, 0x38, 0xf1, 0xf1;"
:"=S"(crc)
:"0"(crc), "c"(*d)
);
buf += sizeof(long);
size -= sizeof(long);
}
while (size) {
const u8 *d = buf;
__asm__ __volatile__(
".byte 0xf2, 0xf, 0x38, 0xf0, 0xf1"
:"=S"(crc)
:"0"(crc), "c"(*d)
);
buf += 1;
size -= 1;
}
return crc;
}
static void *resolve_crc32c(void)
{
__builtin_cpu_init();
#ifdef __x86_64__
if (__builtin_cpu_supports("sse4.2"))
return crc32c_sse42;
#endif
return crc32c_default;
}
/*
* ifunc is buggy and I don't know what breaks it (LTO?)
*/
#ifdef HAVE_WORKING_IFUNC
u32 crc32c(u32, const void *, size_t)
__attribute__((ifunc("resolve_crc32c")));
#else
u32 crc32c(u32 crc, const void *buf, size_t size)
{
static u32 (*real_crc32c)(u32, const void *, size_t);
if (unlikely(!real_crc32c))
real_crc32c = resolve_crc32c();
return real_crc32c(crc, buf, size);
}
#endif /* HAVE_WORKING_IFUNC */
#endif

2
tools-util.h
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@ -149,4 +149,6 @@ const char *strcmp_prefix(const char *, const char *);
unsigned hatoi_validate(const char *, const char *);
u32 crc32c(u32, const void *, size_t);
#endif /* _TOOLS_UTIL_H */