Skip to main content

Browse the archive

Revision 152f8a8ffe00358cae465738eac7b9a4de0b689e authored by Cheng Chang on 14 February 2020, 16:24:09 UTC, committed by Facebook Github Bot on 14 February 2020, 16:26:23 UTC 
Remove unnecessary computation of index (#6406)
 
Summary:
`index` can be replaced by  `iter`, saving the computation of `index++`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6406

Test Plan: make check

Differential Revision: D19905056

Pulled By: cheng-chang

fbshipit-source-id: add4638959c0d2e4e77a11f3fa04ffabaf0de790
1 parent 4034e28
Raw File
crc32c_arm64.h 
//  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).

#ifndef UTIL_CRC32C_ARM64_H
#define UTIL_CRC32C_ARM64_H

#include <cinttypes>

#if defined(__aarch64__) || defined(__AARCH64__)

#ifdef __ARM_FEATURE_CRC32
#define HAVE_ARM64_CRC
#include <arm_acle.h>
#define crc32c_u8(crc, v) __crc32cb(crc, v)
#define crc32c_u16(crc, v) __crc32ch(crc, v)
#define crc32c_u32(crc, v) __crc32cw(crc, v)
#define crc32c_u64(crc, v) __crc32cd(crc, v)
#define PREF4X64L1(buffer, PREF_OFFSET, ITR)                \
  __asm__("PRFM PLDL1KEEP, [%x[v],%[c]]" ::[v] "r"(buffer), \
          [c] "I"((PREF_OFFSET) + ((ITR) + 0) * 64));       \
  __asm__("PRFM PLDL1KEEP, [%x[v],%[c]]" ::[v] "r"(buffer), \
          [c] "I"((PREF_OFFSET) + ((ITR) + 1) * 64));       \
  __asm__("PRFM PLDL1KEEP, [%x[v],%[c]]" ::[v] "r"(buffer), \
          [c] "I"((PREF_OFFSET) + ((ITR) + 2) * 64));       \
  __asm__("PRFM PLDL1KEEP, [%x[v],%[c]]" ::[v] "r"(buffer), \
          [c] "I"((PREF_OFFSET) + ((ITR) + 3) * 64));

#define PREF1KL1(buffer, PREF_OFFSET)  \
  PREF4X64L1(buffer, (PREF_OFFSET), 0) \
  PREF4X64L1(buffer, (PREF_OFFSET), 4) \
  PREF4X64L1(buffer, (PREF_OFFSET), 8) \
  PREF4X64L1(buffer, (PREF_OFFSET), 12)

extern uint32_t crc32c_arm64(uint32_t crc, unsigned char const *data, unsigned len);
extern uint32_t crc32c_runtime_check(void);

#ifdef __ARM_FEATURE_CRYPTO
#define HAVE_ARM64_CRYPTO
#include <arm_neon.h>
#endif  // __ARM_FEATURE_CRYPTO
#endif  // __ARM_FEATURE_CRC32

#endif  // defined(__aarch64__) || defined(__AARCH64__)

#endif
back to top