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611cd6b981
In our unit test, let us rely on our own reference implementation using the reflected CRC-32 ISO 3309 and CRC-32C polynomials. Let us also test with various lengths. Let us refactor the CRC-32 and CRC-32C implementations so that no special compilation flags will be needed and that some function call indirection will be avoided. pmull_supported: Remove. We will have pointers to two separate functions crc32c_aarch64_pmull() and crc32c_aarch64().
60 lines
2 KiB
C++
60 lines
2 KiB
C++
/* Copyright (c) 2020, 2021, MariaDB
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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 St, Fifth Floor, Boston, MA 02110-1335 USA */
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#include <my_global.h>
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#include <my_sys.h>
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#include <zlib.h>
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/* TODO: remove this once zlib adds inherent support for hardware accelerated
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crc32 for all architectures. */
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static unsigned int my_crc32_zlib(unsigned int crc, const void *data,
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size_t len)
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{
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return (unsigned int) crc32(crc, (const Bytef *)data, (unsigned int) len);
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}
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typedef unsigned int (*my_crc32_t)(unsigned int, const void *, size_t);
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#if defined _M_IX86 || defined _M_X64 || defined __i386__ || defined __x86_64__
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extern "C" my_crc32_t crc32_pclmul_enabled();
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#elif defined HAVE_ARMV8_CRC
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extern "C" int crc32_aarch64_available();
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extern "C" unsigned int crc32_aarch64(unsigned int, const void *, size_t);
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#endif
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static my_crc32_t init_crc32()
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{
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#if defined _M_IX86 || defined _M_X64 || defined __i386__ || defined __x86_64__
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if (my_crc32_t crc= crc32_pclmul_enabled())
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return crc;
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#elif defined HAVE_ARMV8_CRC
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if (crc32_aarch64_available())
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return crc32_aarch64;
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#endif
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return my_crc32_zlib;
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}
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static const my_crc32_t my_checksum_func= init_crc32();
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#ifdef __powerpc64__
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# error "my_checksum() is defined in mysys/crc32/crc32_ppc64.c"
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#endif
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extern "C"
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unsigned int my_checksum(unsigned int crc, const void *data, size_t len)
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{
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return my_checksum_func(crc, data, len);
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}
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