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ee4bd4780b
Summary: Closes - https://github.com/facebook/rocksdb/issues/7710 I tested this on an Apple DTK (Developer Transition Kit) with an Apple A12Z Bionic CPU and macOS Big Sur (11.0.1). Previously the arm64 specific CRC optimisations were limited to Linux only OS... Well now Apple Silicon is also arm64 but runs macOS ;-) Pull Request resolved: https://github.com/facebook/rocksdb/pull/7714 Reviewed By: ltamasi Differential Revision: D25287349 Pulled By: pdillinger fbshipit-source-id: 639b168bf0ac2652907531e9604936ac4974b577
168 lines
4.3 KiB
C++
168 lines
4.3 KiB
C++
// Copyright (c) 2018, Arm Limited and affiliates. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "util/crc32c_arm64.h"
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#if defined(HAVE_ARM64_CRC)
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#if defined(__linux__)
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#include <asm/hwcap.h>
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#endif
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#ifdef ROCKSDB_AUXV_GETAUXVAL_PRESENT
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#include <sys/auxv.h>
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#endif
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#ifndef HWCAP_CRC32
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#define HWCAP_CRC32 (1 << 7)
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#endif
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#ifndef HWCAP_PMULL
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#define HWCAP_PMULL (1 << 4)
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#endif
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#ifdef HAVE_ARM64_CRYPTO
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/* unfolding to compute 8 * 3 = 24 bytes parallelly */
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#define CRC32C24BYTES(ITR) \
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crc1 = crc32c_u64(crc1, *(buf64 + BLK_LENGTH + (ITR))); \
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crc2 = crc32c_u64(crc2, *(buf64 + BLK_LENGTH * 2 + (ITR))); \
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crc0 = crc32c_u64(crc0, *(buf64 + (ITR)));
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/* unfolding to compute 24 * 7 = 168 bytes parallelly */
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#define CRC32C7X24BYTES(ITR) \
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do { \
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CRC32C24BYTES((ITR)*7 + 0) \
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CRC32C24BYTES((ITR)*7 + 1) \
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CRC32C24BYTES((ITR)*7 + 2) \
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CRC32C24BYTES((ITR)*7 + 3) \
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CRC32C24BYTES((ITR)*7 + 4) \
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CRC32C24BYTES((ITR)*7 + 5) \
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CRC32C24BYTES((ITR)*7 + 6) \
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} while (0)
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#endif
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extern bool pmull_runtime_flag;
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uint32_t crc32c_runtime_check(void) {
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#ifdef ROCKSDB_AUXV_GETAUXVAL_PRESENT
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uint64_t auxv = getauxval(AT_HWCAP);
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return (auxv & HWCAP_CRC32) != 0;
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#else
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return 0;
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#endif
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}
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bool crc32c_pmull_runtime_check(void) {
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#ifdef ROCKSDB_AUXV_GETAUXVAL_PRESENT
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uint64_t auxv = getauxval(AT_HWCAP);
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return (auxv & HWCAP_PMULL) != 0;
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#else
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return false;
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#endif
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}
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#ifdef ROCKSDB_UBSAN_RUN
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#if defined(__clang__)
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__attribute__((__no_sanitize__("alignment")))
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#elif defined(__GNUC__)
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__attribute__((__no_sanitize_undefined__))
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#endif
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#endif
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uint32_t
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crc32c_arm64(uint32_t crc, unsigned char const *data, size_t len) {
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const uint8_t *buf8;
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const uint64_t *buf64 = (uint64_t *)data;
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int length = (int)len;
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crc ^= 0xffffffff;
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/*
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* Pmull runtime check here.
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* Raspberry Pi supports crc32 but doesn't support pmull.
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* Skip Crc32c Parallel computation if no crypto extension available.
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*/
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if (pmull_runtime_flag) {
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/* Macro (HAVE_ARM64_CRYPTO) is used for compiling check */
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#ifdef HAVE_ARM64_CRYPTO
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/* Crc32c Parallel computation
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* Algorithm comes from Intel whitepaper:
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* crc-iscsi-polynomial-crc32-instruction-paper
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*
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* Input data is divided into three equal-sized blocks
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* Three parallel blocks (crc0, crc1, crc2) for 1024 Bytes
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* One Block: 42(BLK_LENGTH) * 8(step length: crc32c_u64) bytes
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*/
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#define BLK_LENGTH 42
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while (length >= 1024) {
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uint64_t t0, t1;
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uint32_t crc0 = 0, crc1 = 0, crc2 = 0;
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/* Parallel Param:
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* k0 = CRC32(x ^ (42 * 8 * 8 * 2 - 1));
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* k1 = CRC32(x ^ (42 * 8 * 8 - 1));
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*/
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uint32_t k0 = 0xe417f38a, k1 = 0x8f158014;
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/* Prefetch data for following block to avoid cache miss */
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PREF1KL1((uint8_t *)buf64, 1024);
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/* First 8 byte for better pipelining */
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crc0 = crc32c_u64(crc, *buf64++);
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/* 3 blocks crc32c parallel computation
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* Macro unfolding to compute parallelly
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* 168 * 6 = 1008 (bytes)
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*/
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CRC32C7X24BYTES(0);
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CRC32C7X24BYTES(1);
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CRC32C7X24BYTES(2);
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CRC32C7X24BYTES(3);
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CRC32C7X24BYTES(4);
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CRC32C7X24BYTES(5);
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buf64 += (BLK_LENGTH * 3);
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/* Last 8 bytes */
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crc = crc32c_u64(crc2, *buf64++);
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t0 = (uint64_t)vmull_p64(crc0, k0);
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t1 = (uint64_t)vmull_p64(crc1, k1);
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/* Merge (crc0, crc1, crc2) -> crc */
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crc1 = crc32c_u64(0, t1);
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crc ^= crc1;
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crc0 = crc32c_u64(0, t0);
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crc ^= crc0;
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length -= 1024;
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}
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if (length == 0) return crc ^ (0xffffffffU);
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#endif
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} // if Pmull runtime check here
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buf8 = (const uint8_t *)buf64;
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while (length >= 8) {
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crc = crc32c_u64(crc, *(const uint64_t *)buf8);
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buf8 += 8;
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length -= 8;
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}
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/* The following is more efficient than the straight loop */
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if (length >= 4) {
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crc = crc32c_u32(crc, *(const uint32_t *)buf8);
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buf8 += 4;
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length -= 4;
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}
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if (length >= 2) {
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crc = crc32c_u16(crc, *(const uint16_t *)buf8);
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buf8 += 2;
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length -= 2;
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}
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if (length >= 1) crc = crc32c_u8(crc, *buf8);
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crc ^= 0xffffffff;
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return crc;
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}
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#endif
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