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Mac M1 crc32 intrinsics ARM64 check support proposal (#7893)

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Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/7893

Reviewed By: ajkr

Differential Revision: D26050966

Pulled By: jay-zhuang

fbshipit-source-id: 9df2bb65d82defd7fad49d5369979b03e22d39c2
This commit is contained in:
David CARLIER 2021-03-10 09:04:01 -08:00 committed by Facebook GitHub Bot
parent cc34da75b5
commit 7a3444bf1f
1 changed files with 14 additions and 0 deletions
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14
util/crc32c_arm64.cc
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@ -19,6 +19,9 @@
#ifndef HWCAP_PMULL
#define HWCAP_PMULL (1 << 4)
#endif
#if defined(__APPLE__)
#include <sys/sysctl.h>
#endif
#ifdef HAVE_ARM64_CRYPTO
/* unfolding to compute 8 * 3 = 24 bytes parallelly */
@ -43,6 +46,7 @@
extern bool pmull_runtime_flag;
uint32_t crc32c_runtime_check(void) {
#if !defined(__APPLE__)
uint64_t auxv = 0;
#if defined(ROCKSDB_AUXV_GETAUXVAL_PRESENT)
auxv = getauxval(AT_HWCAP);
@ -50,9 +54,16 @@ uint32_t crc32c_runtime_check(void) {
elf_aux_info(AT_HWCAP, &auxv, sizeof(auxv));
#endif
return (auxv & HWCAP_CRC32) != 0;
#else
int r;
size_t l = sizeof(r);
if (sysctlbyname("hw.optional.armv8_crc32", &r, &l, NULL, 0) == -1) return 0;
return r == 1;
#endif
}
bool crc32c_pmull_runtime_check(void) {
#if !defined(__APPLE__)
uint64_t auxv = 0;
#if defined(ROCKSDB_AUXV_GETAUXVAL_PRESENT)
auxv = getauxval(AT_HWCAP);
@ -60,6 +71,9 @@ bool crc32c_pmull_runtime_check(void) {
elf_aux_info(AT_HWCAP, &auxv, sizeof(auxv));
#endif
return (auxv & HWCAP_PMULL) != 0;
#else
return true;
#endif
}
#ifdef ROCKSDB_UBSAN_RUN