fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
1.4 KiB
56 lines
1.4 KiB
// Copyright (c) 2018, Arm Limited and affiliates. All rights reserved.
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
|
|
#include "util/crc32c_arm64.h"
|
|
|
|
#if defined(__linux__) && defined(HAVE_ARM64_CRC)
|
|
|
|
#include <asm/hwcap.h>
|
|
#include <sys/auxv.h>
|
|
#ifndef HWCAP_CRC32
|
|
#define HWCAP_CRC32 (1 << 7)
|
|
#endif
|
|
uint32_t crc32c_runtime_check(void) {
|
|
uint64_t auxv = getauxval(AT_HWCAP);
|
|
return (auxv & HWCAP_CRC32) != 0;
|
|
}
|
|
|
|
uint32_t crc32c_arm64(uint32_t crc, unsigned char const *data,
|
|
unsigned len) {
|
|
const uint8_t *buf1;
|
|
const uint16_t *buf2;
|
|
const uint32_t *buf4;
|
|
const uint64_t *buf8;
|
|
|
|
int64_t length = (int64_t)len;
|
|
|
|
crc ^= 0xffffffff;
|
|
buf8 = (const uint64_t *)data;
|
|
while ((length -= sizeof(uint64_t)) >= 0) {
|
|
crc = __crc32cd(crc, *buf8++);
|
|
}
|
|
|
|
/* The following is more efficient than the straight loop */
|
|
buf4 = (const uint32_t *)buf8;
|
|
if (length & sizeof(uint32_t)) {
|
|
crc = __crc32cw(crc, *buf4++);
|
|
length -= 4;
|
|
}
|
|
|
|
buf2 = (const uint16_t *)buf4;
|
|
if (length & sizeof(uint16_t)) {
|
|
crc = __crc32ch(crc, *buf2++);
|
|
length -= 2;
|
|
}
|
|
|
|
buf1 = (const uint8_t *)buf2;
|
|
if (length & sizeof(uint8_t))
|
|
crc = __crc32cb(crc, *buf1);
|
|
|
|
crc ^= 0xffffffff;
|
|
return crc;
|
|
}
|
|
|
|
#endif
|
|
|