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#include "../../zutil.h"
#if defined(__linux__)
# include <sys/auxv.h>
# ifdef ARM_ASM_HWCAP
# include <asm/hwcap.h>
# endif
#elif defined(__FreeBSD__) && defined(__aarch64__)
# include <machine/armreg.h>
# ifndef ID_AA64ISAR0_CRC32_VAL
# define ID_AA64ISAR0_CRC32_VAL ID_AA64ISAR0_CRC32
# endif
#elif defined(__APPLE__)
# include <sys/sysctl.h>
#elif defined(_WIN32)
# include <winapifamily.h>
#endif
static int arm_has_crc32() {
#if defined(__linux__) && defined(ARM_AUXV_HAS_CRC32)
# ifdef HWCAP_CRC32
return (getauxval(AT_HWCAP) & HWCAP_CRC32) != 0 ? 1 : 0;
# else
return (getauxval(AT_HWCAP2) & HWCAP2_CRC32) != 0 ? 1 : 0;
# endif
#elif defined(__FreeBSD__) && defined(__aarch64__)
return getenv("QEMU_EMULATING") == NULL
&& ID_AA64ISAR0_CRC32_VAL(READ_SPECIALREG(id_aa64isar0_el1)) >= ID_AA64ISAR0_CRC32_BASE;
#elif defined(__APPLE__)
int hascrc32;
size_t size = sizeof(hascrc32);
return sysctlbyname("hw.optional.armv8_crc32", &hascrc32, &size, NULL, 0) == 0
&& hascrc32 == 1;
#elif defined(ARM_NOCHECK_ACLE)
return 1;
#else
return 0;
#endif
}
/* AArch64 has neon. */
#if !defined(__aarch64__) && !defined(_M_ARM64)
static inline int arm_has_neon() {
#if defined(__linux__) && defined(ARM_AUXV_HAS_NEON)
# ifdef HWCAP_ARM_NEON
return (getauxval(AT_HWCAP) & HWCAP_ARM_NEON) != 0 ? 1 : 0;
# else
return (getauxval(AT_HWCAP) & HWCAP_NEON) != 0 ? 1 : 0;
# endif
#elif defined(__APPLE__)
int hasneon;
size_t size = sizeof(hasneon);
return sysctlbyname("hw.optional.neon", &hasneon, &size, NULL, 0) == 0
&& hasneon == 1;
#elif defined(_M_ARM) && defined(WINAPI_FAMILY_PARTITION)
# if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_PHONE_APP)
return 1; /* Always supported */
# endif
#endif
#if defined(ARM_NOCHECK_NEON)
return 1;
#else
return 0;
#endif
}
#endif
Z_INTERNAL int arm_cpu_has_neon;
Z_INTERNAL int arm_cpu_has_crc32;
void Z_INTERNAL arm_check_features(void) {
#if defined(__aarch64__) || defined(_M_ARM64)
arm_cpu_has_neon = 1; /* always available */
#else
arm_cpu_has_neon = arm_has_neon();
#endif
arm_cpu_has_crc32 = arm_has_crc32();
}
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