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Mac M1 crc32 detection support

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Closes GH-6556.
This commit is contained in:
David CARLIER 2020-12-31 14:52:57 +00:00 • committed by Nikita Popov
parent 151fce1129
commit 6e90c75507
1 changed files with 6 additions and 0 deletions
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6
ext/standard/crc32.c
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@ -24,6 +24,8 @@
# if defined(__linux__)
# include <sys/auxv.h>
# include <asm/hwcap.h>
# elif defined(__APPLE__)
# include <sys/sysctl.h>
# endif
static inline int has_crc32_insn() {
@ -37,6 +39,10 @@ static inline int has_crc32_insn() {
# elif defined(HWCAP2_CRC32)
res = getauxval(AT_HWCAP2) & HWCAP2_CRC32;
return res;
# elif defined(__APPLE__)
size_t reslen = sizeof(res);
if (sysctlbyname("hw.optional.armv8_crc32", &res, &reslen, NULL, 0) < 0)
res = 0;
# else
res = 0;
return res;