mirror of
https://github.com/php/php-src.git
synced 2024-09-22 18:37:25 +00:00
2a535a9707
The time goes from 0.838s down to 0.029s (a 28x speedup) on a Graviton A1
instance and the following benchmark:
function simple_crc32() {
$a = "foo";
for ($i = 0; $i < 10000; $i++) {
crc32($a);
$a .= "o".$i;
}
}
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 7 |
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+----------------------------------------------------------------------+
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| Copyright (c) The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Author: Rasmus Lerdorf <rasmus@php.net> |
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+----------------------------------------------------------------------+
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*/
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#include "php.h"
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#include "basic_functions.h"
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#include "crc32.h"
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#if defined(__aarch64__)
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# pragma GCC target ("+nothing+crc")
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# include <arm_acle.h>
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# if defined(__linux__)
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# include <sys/auxv.h>
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# include <asm/hwcap.h>
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# endif
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static inline int has_crc32_insn() {
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/* Only go through the runtime detection once. */
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static int res = -1;
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if (res != -1)
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return res;
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# if defined(HWCAP_CRC32)
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res = getauxval(AT_HWCAP) & HWCAP_CRC32;
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return res;
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# elif defined(HWCAP2_CRC32)
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res = getauxval(AT_HWCAP2) & HWCAP2_CRC32;
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return res;
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# else
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res = 0;
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return res;
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# endif
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}
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#endif
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/* {{{ proto string crc32(string str)
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Calculate the crc32 polynomial of a string */
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PHP_NAMED_FUNCTION(php_if_crc32)
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{
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char *p;
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size_t nr;
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uint32_t crcinit = 0;
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register uint32_t crc;
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ZEND_PARSE_PARAMETERS_START(1, 1)
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Z_PARAM_STRING(p, nr)
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ZEND_PARSE_PARAMETERS_END();
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crc = crcinit^0xFFFFFFFF;
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#if defined(__aarch64__)
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if (has_crc32_insn()) {
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while(nr >= sizeof(uint64_t)) {
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crc = __crc32d(crc, *(uint64_t *)p);
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p += sizeof(uint64_t);
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nr -= sizeof(uint64_t);
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}
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if (nr >= sizeof(int32_t)) {
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crc = __crc32w(crc, *(uint32_t *)p);
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p += sizeof(uint32_t);
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nr -= sizeof(uint32_t);
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}
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if (nr >= sizeof(int16_t)) {
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crc = __crc32h(crc, *(uint16_t *)p);
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p += sizeof(uint16_t);
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nr -= sizeof(uint16_t);
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}
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if (nr) {
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crc = __crc32b(crc, *p);
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p += sizeof(uint8_t);
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nr -= sizeof(uint8_t);
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}
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}
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#endif
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for (; nr--; ++p) {
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crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32tab[(crc ^ (*p)) & 0xFF ];
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}
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RETVAL_LONG(crc^0xFFFFFFFF);
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}
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/* }}} */
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