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|
/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Rasmus Lerdorf <rasmus@php.net> |
+----------------------------------------------------------------------+
*/
#include "php.h"
#include "basic_functions.h"
#include "crc32.h"
#if HAVE_AARCH64_CRC32
# include <arm_acle.h>
# if defined(__linux__)
# include <sys/auxv.h>
# include <asm/hwcap.h>
# endif
static inline int has_crc32_insn() {
/* Only go through the runtime detection once. */
static int res = -1;
if (res != -1)
return res;
# if defined(HWCAP_CRC32)
res = getauxval(AT_HWCAP) & HWCAP_CRC32;
return res;
# elif defined(HWCAP2_CRC32)
res = getauxval(AT_HWCAP2) & HWCAP2_CRC32;
return res;
# else
res = 0;
return res;
# endif
}
# pragma GCC push_options
# pragma GCC target ("+nothing+crc")
static uint32_t crc32_aarch64(uint32_t crc, char *p, size_t nr) {
while (nr >= sizeof(uint64_t)) {
crc = __crc32d(crc, *(uint64_t *)p);
p += sizeof(uint64_t);
nr -= sizeof(uint64_t);
}
if (nr >= sizeof(int32_t)) {
crc = __crc32w(crc, *(uint32_t *)p);
p += sizeof(uint32_t);
nr -= sizeof(uint32_t);
}
if (nr >= sizeof(int16_t)) {
crc = __crc32h(crc, *(uint16_t *)p);
p += sizeof(uint16_t);
nr -= sizeof(uint16_t);
}
if (nr) {
crc = __crc32b(crc, *p);
}
return crc;
}
# pragma GCC pop_options
#endif
/* {{{ proto string crc32(string str)
Calculate the crc32 polynomial of a string */
PHP_NAMED_FUNCTION(php_if_crc32)
{
char *p;
size_t nr;
uint32_t crcinit = 0;
register uint32_t crc;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_STRING(p, nr)
ZEND_PARSE_PARAMETERS_END();
crc = crcinit^0xFFFFFFFF;
#if HAVE_AARCH64_CRC32
if (has_crc32_insn()) {
crc = crc32_aarch64(crc, p, nr);
RETURN_LONG(crc^0xFFFFFFFF);
}
#endif
for (; nr--; ++p) {
crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32tab[(crc ^ (*p)) & 0xFF ];
}
RETURN_LONG(crc^0xFFFFFFFF);
}
/* }}} */
|
