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65e1399e64
Significantly reduce the amount of InnoDB, XtraDB and Mariabackup code changes by defining pfs_os_file_t as something that is transparently compatible with os_file_t.
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/******************************************************
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Copyright (c) 2017 Percona LLC and/or its affiliates.
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Zlib compatible CRC-32 implementation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*******************************************************/
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#include "my_config.h"
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#include "crc_glue.h"
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#include "crc-intel-pclmul.h"
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#include <stdint.h>
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#include <string.h>
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#include <zlib.h>
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#if __GNUC__ >= 4 && defined(__x86_64__)
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static int pclmul_enabled = 0;
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#endif
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#if defined(__GNUC__) && defined(__x86_64__)
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static
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uint32_t
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cpuid(uint32_t* ecx, uint32_t* edx)
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{
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uint32_t level;
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asm("cpuid" : "=a" (level) : "a" (0) : "ebx", "ecx", "edx");
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if (level < 1) {
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return level;
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}
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asm("cpuid" : "=c" (*ecx), "=d" (*edx)
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: "a" (1)
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: "ebx");
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return level;
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}
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#endif
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void crc_init() {
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#if defined(__GNUC__) && defined(__x86_64__)
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uint32_t ecx, edx;
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if (cpuid(&ecx, &edx) > 0) {
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pclmul_enabled = ((ecx >> 19) & 1) && ((ecx >> 1) & 1);
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}
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#endif
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}
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unsigned long crc32_iso3309(unsigned long crc, const unsigned char *buf, unsigned int len)
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{
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#if __GNUC__ >= 4 && defined(__x86_64__) && defined(HAVE_CLMUL_INSTRUCTION)
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if (pclmul_enabled) {
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uint32_t crc_accum = crc ^ 0xffffffffL;
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crc32_intel_pclmul(&crc_accum, buf, len);
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return crc_accum ^ 0xffffffffL;
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}
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#endif
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return crc32(crc, buf, len);
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}
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