Open Source Computer Vision Library
https://opencv.org/
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100 lines
2.9 KiB
100 lines
2.9 KiB
#include "../../zbuild.h" |
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#include "arm_features.h" |
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#if defined(__linux__) && defined(HAVE_SYS_AUXV_H) |
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# include <sys/auxv.h> |
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# ifdef ARM_ASM_HWCAP |
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# include <asm/hwcap.h> |
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# endif |
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#elif defined(__FreeBSD__) && defined(__aarch64__) |
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# include <machine/armreg.h> |
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# ifndef ID_AA64ISAR0_CRC32_VAL |
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# define ID_AA64ISAR0_CRC32_VAL ID_AA64ISAR0_CRC32 |
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# endif |
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#elif defined(__APPLE__) |
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# if !defined(_DARWIN_C_SOURCE) |
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# define _DARWIN_C_SOURCE /* enable types aliases (eg u_int) */ |
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# endif |
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# include <sys/sysctl.h> |
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#elif defined(_WIN32) |
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# include <windows.h> |
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#endif |
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static int arm_has_crc32() { |
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#if defined(__linux__) && defined(ARM_AUXV_HAS_CRC32) |
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# ifdef HWCAP_CRC32 |
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return (getauxval(AT_HWCAP) & HWCAP_CRC32) != 0 ? 1 : 0; |
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# else |
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return (getauxval(AT_HWCAP2) & HWCAP2_CRC32) != 0 ? 1 : 0; |
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# endif |
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#elif defined(__FreeBSD__) && defined(__aarch64__) |
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return getenv("QEMU_EMULATING") == NULL |
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&& ID_AA64ISAR0_CRC32_VAL(READ_SPECIALREG(id_aa64isar0_el1)) >= ID_AA64ISAR0_CRC32_BASE; |
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#elif defined(__APPLE__) |
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int hascrc32; |
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size_t size = sizeof(hascrc32); |
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return sysctlbyname("hw.optional.armv8_crc32", &hascrc32, &size, NULL, 0) == 0 |
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&& hascrc32 == 1; |
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#elif defined(_WIN32) |
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return IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE); |
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#elif defined(ARM_NOCHECK_ACLE) |
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return 1; |
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#else |
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return 0; |
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#endif |
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} |
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/* AArch64 has neon. */ |
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#if !defined(__aarch64__) && !defined(_M_ARM64) && !defined(_M_ARM64EC) |
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static inline int arm_has_neon() { |
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#if defined(__linux__) && defined(ARM_AUXV_HAS_NEON) |
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# ifdef HWCAP_ARM_NEON |
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return (getauxval(AT_HWCAP) & HWCAP_ARM_NEON) != 0 ? 1 : 0; |
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# else |
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return (getauxval(AT_HWCAP) & HWCAP_NEON) != 0 ? 1 : 0; |
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# endif |
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#elif defined(__APPLE__) |
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int hasneon; |
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size_t size = sizeof(hasneon); |
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return sysctlbyname("hw.optional.neon", &hasneon, &size, NULL, 0) == 0 |
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&& hasneon == 1; |
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#elif defined(_M_ARM) && defined(WINAPI_FAMILY_PARTITION) |
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# if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_PHONE_APP) |
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return 1; /* Always supported */ |
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# endif |
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#endif |
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#if defined(ARM_NOCHECK_NEON) |
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return 1; |
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#else |
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return 0; |
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#endif |
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} |
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#endif |
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/* AArch64 does not have ARMv6 SIMD. */ |
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#if !defined(__aarch64__) && !defined(_M_ARM64) && !defined(_M_ARM64EC) |
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static inline int arm_has_simd() { |
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#if defined(__linux__) && defined(HAVE_SYS_AUXV_H) |
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const char *platform = (const char *)getauxval(AT_PLATFORM); |
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return strncmp(platform, "v6l", 3) == 0 |
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|| strncmp(platform, "v7l", 3) == 0 |
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|| strncmp(platform, "v8l", 3) == 0; |
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#elif defined(ARM_NOCHECK_SIMD) |
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return 1; |
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#else |
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return 0; |
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#endif |
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} |
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#endif |
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void Z_INTERNAL arm_check_features(struct arm_cpu_features *features) { |
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#if defined(__aarch64__) || defined(_M_ARM64) || defined(_M_ARM64EC) |
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features->has_simd = 0; /* never available */ |
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features->has_neon = 1; /* always available */ |
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#else |
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features->has_simd = arm_has_simd(); |
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features->has_neon = arm_has_neon(); |
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#endif |
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features->has_crc32 = arm_has_crc32(); |
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}
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