path: root/src/detection/cpu/cpu.c

#include "cpu.h"

const char* ffDetectCPUImpl(const FFCPUOptions* options, FFCPUResult* cpu);

const char* ffDetectCPU(const FFCPUOptions* options, FFCPUResult* cpu) {
    const char* error = ffDetectCPUImpl(options, cpu);
    if (error) {
        return error;
    }

    const char* removeStrings[] = {
        " CPU", " FPU", " APU", " Processor", " Dual-Core", " Quad-Core", " Six-Core", " Eight-Core", " Ten-Core", " 2-Core", " 4-Core", " 6-Core", " 8-Core", " 10-Core", " 12-Core", " 14-Core", " 16-Core"
    };
    ffStrbufRemoveStrings(&cpu->name, ARRAY_SIZE(removeStrings), removeStrings);
    uint32_t radeonGraphics = ffStrbufFirstIndexS(&cpu->name, " w/ Radeon "); // w/ Radeon 780M Graphics
    if (radeonGraphics >= cpu->name.length) {
        radeonGraphics = ffStrbufFirstIndexS(&cpu->name, " with Radeon ");
    }
    if (radeonGraphics < cpu->name.length) {
        ffStrbufSubstrBefore(&cpu->name, radeonGraphics);
    }
    ffStrbufSubstrBeforeFirstC(&cpu->name, '@'); // Cut the speed output in the name as we append our own
    ffStrbufTrimRight(&cpu->name, ' ');          // If we removed the @ in previous step there was most likely a space before it
    ffStrbufRemoveDupWhitespaces(&cpu->name);
    return NULL;
}

const char* ffCPUAppleCodeToName(uint32_t code) {
    // https://github.com/AsahiLinux/docs/wiki/Codenames
    switch (code) {
        case 8103:
            return "Apple M1";
        case 6000:
            return "Apple M1 Pro";
        case 6001:
            return "Apple M1 Max";
        case 6002:
            return "Apple M1 Ultra";
        case 8112:
            return "Apple M2";
        case 6020:
            return "Apple M2 Pro";
        case 6021:
            return "Apple M2 Max";
        case 6022:
            return "Apple M2 Ultra";
        case 8122:
            return "Apple M3";
        case 6030:
            return "Apple M3 Pro";
        case 6031:
        case 6034:
            return "Apple M3 Max";
        case 8132:
            return "Apple M4";
        case 6040:
            return "Apple M4 Pro";
        case 6041:
            return "Apple M4 Max";
        default:
            return NULL;
    }
}

const char* ffCPUQualcommCodeToName(uint32_t code) {
    // https://github.com/AsahiLinux/docs/wiki/Codenames
    switch (code) {
        case 7180:
            return "Qualcomm Snapdragon 7c";
        case 7280:
            return "Qualcomm Snapdragon 7c+ Gen 3";
        case 8180:
            return "Qualcomm Snapdragon 8cx Gen 2 5G";
        case 8280:
            return "Qualcomm Snapdragon 8cx Gen 3";
        default:
            return NULL;
    }
}

#if defined(__x86_64__) || defined(__i386__)

    #include <cpuid.h>

void ffCPUDetectByCpuid(FFCPUResult* cpu) {
    uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
    if (__get_cpuid(0x16, &eax, &ebx, &ecx, &edx)) {
        // WARNING: CPUID may report frequencies of efficient cores
        // cpuid returns 0 MHz when hypervisor is enabled
        if (eax) {
            cpu->frequencyBase = eax;
        }
        if (ebx) {
            cpu->frequencyMax = ebx;
        }
    }

    if (__get_cpuid(1, &eax, &ebx, &ecx, &edx)) {
        // Feature tests (leaf1.ecx, leaf7.ebx)
        bool sse2 = (ecx & bit_SSE2) != 0;
        bool sse4_2 = (ecx & bit_SSE4_2) != 0;
        bool pclmul = (ecx & bit_PCLMUL) != 0;
        bool popcnt = (ecx & bit_POPCNT) != 0;
        bool fma = (ecx & bit_FMA) != 0;
        bool osxsave = (ecx & bit_OSXSAVE) != 0;

        unsigned int eax7 = 0, ebx7 = 0, ecx7 = 0, edx7 = 0;
        __get_cpuid_count(7, 0, &eax7, &ebx7, &ecx7, &edx7);

        bool avx2 = (ebx7 & bit_AVX2) != 0;
        bool bmi2 = (ebx7 & bit_BMI2) != 0;
        bool avx512f = (ebx7 & bit_AVX512F) != 0;
        bool avx512bw = (ebx7 & bit_AVX512BW) != 0;
        bool avx512dq = (ebx7 & bit_AVX512DQ) != 0;

        // OS support for AVX/AVX512: check XGETBV (requires OSXSAVE)
        bool avx_os = false;
        bool avx512_os = false;
        if (osxsave) {
            __asm__ __volatile__(
                "xgetbv"
                : "=a"(eax), "=d"(edx)
                : "c"(0)
                :);
            uint64_t xcr0 = ((uint64_t) edx << 32) | eax;

            // AVX requires XCR0[1:2] == 11b (XMM and YMM state)
            avx_os = (xcr0 & 0x6ULL) == 0x6ULL;
            // AVX512 requires XCR0[7,5,6] etc. common mask 0xE6 (bits 1,2,5,6,7)
            avx512_os = (xcr0 & 0xE6ULL) == 0xE6ULL;
        }

        cpu->march = "unknown";
        if (avx512f && avx512bw && avx512dq && avx512_os) {
            cpu->march = "x86_64-v4";
        } else if (avx2 && fma && bmi2 && avx_os) {
            cpu->march = "x86_64-v3";
        } else if (sse4_2 && popcnt && pclmul) {
            cpu->march = "x86_64-v2";
        } else if (sse2) {
            cpu->march = "x86_64-v1";
        }
    }
}

#elif defined(__aarch64__)

// This is not accurate because a lot of flags are optional from old versions
// https://developer.arm.com/documentation/109697/2025_06/Feature-descriptions?lang=en
// https://en.wikipedia.org/wiki/AArch64#ARM-A_(application_architecture)
// Worth noting: Apple M1 is marked as ARMv8.5-A on Wikipedia, but it lacks BTI (mandatory in v8.5)

    #ifdef __linux__
        #include "common/io.h"
        #include <elf.h>
// #include <asm/hwcap.h>

void ffCPUDetectByCpuid(FFCPUResult* cpu) {
    char buf[PROC_FILE_BUFFSIZ];
    ssize_t nRead = ffReadFileData("/proc/self/auxv", ARRAY_SIZE(buf), buf);

    if (nRead < (ssize_t) sizeof(Elf64_auxv_t)) {
        return;
    }

    uint64_t hwcap = 0, hwcap2 = 0;

    for (Elf64_auxv_t* auxv = (Elf64_auxv_t*) buf; (char*) auxv < buf + nRead; ++auxv) {
        if (auxv->a_type == AT_HWCAP) {
            hwcap = auxv->a_un.a_val;
        } else if (auxv->a_type == AT_HWCAP2) {
            hwcap2 = auxv->a_un.a_val;
        }
    }

    if (!hwcap) {
        return;
    }

    cpu->march = "unknown";

    // ARMv8-A
    bool has_fp = (hwcap & (1 << 0) /* HWCAP_FP */) != 0;
    bool has_asimd = (hwcap & (1 << 1) /* HWCAP_ASIMD */) != 0;

    // ARMv8.1-A
    bool has_atomics = (hwcap & (1 << 8) /* HWCAP_ATOMICS */) != 0;    // optional from v8.0
    bool has_crc32 = (hwcap & (1 << 7) /* HWCAP_CRC32 */) != 0;        // optional from v8.0
    bool has_asimdrdm = (hwcap & (1 << 12) /* HWCAP_ASIMDRDM */) != 0; // optional from v8.0

    // ARMv8.2-A
    bool has_fphp = (hwcap & (1 << 9) /* HWCAP_FPHP */) != 0;    // optional
    bool has_dcpop = (hwcap & (1 << 16) /* HWCAP_DCPOP */) != 0; // DC CVAP, optional from v8.1

    // ARMv8.3-A
    bool has_paca = (hwcap & (1 << 30) /* HWCAP_PACA */) != 0;   // optional from v8.2
    bool has_lrcpc = (hwcap & (1 << 15) /* HWCAP_LRCPC */) != 0; // optional from v8.2
    bool has_fcma = (hwcap & (1 << 14) /* HWCAP_FCMA */) != 0;   // optional from v8.2
    bool has_jscvt = (hwcap & (1 << 13) /* HWCAP_JSCVT */) != 0; // optional from v8.2

    // ARMv8.4-A
    bool has_dit = (hwcap & (1 << 24) /* HWCAP_DIT */) != 0;       // optional from v8.3
    bool has_flagm = (hwcap & (1 << 27) /* HWCAP_FLAGM */) != 0;   // optional from v8.1
    bool has_ilrcpc = (hwcap & (1 << 26) /* HWCAP_ILRCPC */) != 0; // optional from v8.2

    // ARMv8.5-A
    bool has_bti = (hwcap2 & (1 << 17) /* HWCAP2_BTI */) != 0;      // optional from v8.4
    bool has_sb = (hwcap & (1 << 29) /* HWCAP_SB */) != 0;          // optional from v8.0
    bool has_dcpodp = (hwcap2 & (1 << 0) /* HWCAP2_DCPODP */) != 0; // optional from v8.1
    bool has_flagm2 = (hwcap2 & (1 << 7) /* HWCAP2_FLAGM2 */) != 0; // optional from v8.4
    bool has_frint = (hwcap2 & (1 << 8) /* HWCAP2_FRINT */) != 0;   // optional from v8.4

    // ARMv9.0-A
    bool has_sve2 = (hwcap2 & (1 << 1) /* HWCAP2_SVE2 */) != 0;

    // ARMv9.1-A
    // ARMv8.6-A
    bool has_bf16 = (hwcap2 & (1 << 14) /* HWCAP2_BF16 */) != 0; // optional from v8.2
    bool has_i8mm = (hwcap2 & (1 << 13) /* HWCAP2_I8MM */) != 0; // optional from v8.1

    // ARMv8.7-A
    bool has_afp = (hwcap2 & (1 << 20) /* HWCAP2_AFP */) != 0; // optional from v8.6

    // ARMv9.2-A
    bool has_sme = (hwcap2 & (1 << 23) /* HWCAP2_SME */) != 0;

    // ARMv9.3-A
    bool has_sme2 = (hwcap2 & (1UL << 37) /* HWCAP2_SME2 */) != 0; // optional from v9.2

    // ARMv8.8-A
    bool has_mops = (hwcap2 & (1UL << 43) /* HWCAP2_MOPS */) != 0; // optional from v8.7

    // ARMv8.9-A
    bool has_cssc = (hwcap2 & (1UL << 34) /* HWCAP2_CSSC */) != 0; // optional from v8.7

    // ARMv9.4-A
    bool has_sme2p1 = (hwcap2 & (1UL << 38) /* HWCAP2_SME2P1 */) != 0; // optional from v9.2

    // ARMv9.5-A
    bool has_f8e4m3 = (hwcap2 & (1UL << 55) /* HWCAP2_F8E4M3 */) != 0; // optional from v9.2
    bool has_f8e5m2 = (hwcap2 & (1UL << 56) /* HWCAP2_F8E5M2 */) != 0; // optional from v9.2

    // ARMv9.6-A
    bool has_cmpbr = (hwcap & (1UL << 33) /* HWCAP_CMPBR */) != 0;   // optional from v9.5
    bool has_fprcvt = (hwcap & (1UL << 34) /* HWCAP_FPRCVT */) != 0; // optional from v9.5

    if (has_sve2 || has_sme) {
        // ARMv9
        if (has_cmpbr && has_fprcvt) {
            cpu->march = "ARMv9.6-A";
        } else if (has_f8e5m2 && has_f8e4m3) {
            cpu->march = "ARMv9.5-A";
        } else if (has_sme2p1) {
            cpu->march = "ARMv9.4-A";
        } else if (has_sme2) {
            cpu->march = "ARMv9.3-A";
        } else if (has_sme) {
            cpu->march = "ARMv9.2-A";
        } else if (has_i8mm && has_bf16) {
            cpu->march = "ARMv9.1-A";
        } else {
            cpu->march = "ARMv9.0-A";
        }
    } else {
        // ARMv8
        if (has_cssc) {
            cpu->march = "ARMv8.9-A";
        } else if (has_mops) {
            cpu->march = "ARMv8.8-A";
        } else if (has_afp) {
            cpu->march = "ARMv8.7-A";
        } else if (has_i8mm && has_bf16) {
            cpu->march = "ARMv8.6-A";
        } else if (has_bti && has_sb && has_dcpodp && has_flagm2 && has_frint) {
            cpu->march = "ARMv8.5-A";
        } else if (has_dit && has_flagm && has_ilrcpc) {
            cpu->march = "ARMv8.4-A";
        } else if (has_paca && has_lrcpc && has_fcma && has_jscvt) {
            cpu->march = "ARMv8.3-A";
        } else if (has_fphp && has_dcpop) {
            cpu->march = "ARMv8.2-A";
        } else if (has_atomics && has_crc32 && has_asimdrdm) {
            cpu->march = "ARMv8.1-A";
        } else if (has_asimd && has_fp) {
            cpu->march = "ARMv8-A";
        }
    }
}
    #elif __APPLE__
        #include <sys/sysctl.h>
// #include <arm/cpu_capabilities_public.h> // Not available in macOS 14-

void ffCPUDetectByCpuid(FFCPUResult* cpu) {
    uint64_t caps[2] = { 0 }; // 80-bit capability mask, split into two 64-bit values
    size_t size = sizeof(caps);

    if (sysctlbyname("hw.optional.arm.caps", caps, &size, NULL, 0) != 0) {
        return;
    }

        // Helper macro to test bit in 80-bit capability mask
        #define FF_HAS_CAP(bit) \
            (((bit) < 64) ? ((caps[0] >> (bit)) & 1ULL) : ((caps[1] >> ((bit) - 64U)) & 1ULL))

    cpu->march = "unknown";

    // ARMv8-A
    bool has_fp = FF_HAS_CAP(50); /* CAP_BIT_AdvSIMD_HPFPCvt */ // Full FP16 support (implies FP/ASIMD)
    bool has_asimd = FF_HAS_CAP(49); /* CAP_BIT_AdvSIMD */      // Advanced SIMD (NEON)

    // ARMv8.1-A
    bool has_lse = FF_HAS_CAP(6); /* CAP_BIT_FEAT_LSE */      // Large System Extensions, optional in v8.0
    bool has_crc32 = FF_HAS_CAP(51); /* CAP_BIT_FEAT_CRC32 */ // CRC32 instructions, optional in v8.0
    bool has_rdm = FF_HAS_CAP(5); /* CAP_BIT_FEAT_RDM */      // AdvSIMD rounding double multiply accumulate, optional in v8.0

    // ARMv8.2-A
    bool has_fp16 = FF_HAS_CAP(34); /* CAP_BIT_FEAT_FP16 */ // Half-precision FP support, optional
    bool has_dpb = FF_HAS_CAP(22); /* CAP_BIT_FEAT_DPB */   // DC CVAP, optional from v8.1

    // ARMv8.3-A
    bool has_pauth = FF_HAS_CAP(19); /* CAP_BIT_FEAT_PAuth */ // Pointer Authentication (PAC), optional from v8.2
    bool has_lrcpc = FF_HAS_CAP(15); /* CAP_BIT_FEAT_LRCPC */ // LDAPR/LR with RCPC semantics, optional from v8.2
    bool has_fcma = FF_HAS_CAP(17); /* CAP_BIT_FEAT_FCMA */   // Complex number multiply-add, optional from v8.2
    bool has_jscvt = FF_HAS_CAP(18); /* CAP_BIT_FEAT_JSCVT */ // JavaScript-style conversion (FJCVTZS), optional from v8.2

    // ARMv8.4-A
    bool has_lse2 = FF_HAS_CAP(30); /* CAP_BIT_FEAT_LSE2 */     // Large System Extensions version 2, optional from v8.2
    bool has_dit = FF_HAS_CAP(33); /* CAP_BIT_FEAT_DIT */       // Data Independent Timing, optional from v8.3
    bool has_flagm = FF_HAS_CAP(0); /* CAP_BIT_FEAT_FlagM */    // Flag manipulation (FMOV/FCVT), optional from v8.1
    bool has_lrcpc2 = FF_HAS_CAP(16); /* CAP_BIT_FEAT_LRCPC2 */ // Enhanced RCPC (LDAPUR/LDAPST), optional from v8.2

    // ARMv8.5-A
    bool has_bti = FF_HAS_CAP(36); /* CAP_BIT_FEAT_BTI */         // Branch Target Identification, optional from v8.4
    bool has_sb = FF_HAS_CAP(13); /* CAP_BIT_FEAT_SB */           // Speculative Barrier, optional from v8.0
    bool has_dpb2 = FF_HAS_CAP(23); /* CAP_BIT_FEAT_DPB2 */       // DC CVADP (DPB2), optional from v8.1
    bool has_flagm2 = FF_HAS_CAP(1); /* CAP_BIT_FEAT_FlagM2 */    // Enhanced FlagM, optional from v8.4
    bool has_frintts = FF_HAS_CAP(14); /* CAP_BIT_FEAT_FRINTTS */ // Floating-point to integer instructions, optional from v8.4

    // ARMv9.0-A
    bool has_sve2 = false; // Not exposed and not supported by Apple M4

    // ARMv9.1-A
    // ARMv8.6-A
    bool has_bf16 = FF_HAS_CAP(24); /* CAP_BIT_FEAT_BF16 */ // Brain float16, optional from v8.2
    bool has_i8mm = FF_HAS_CAP(25); /* CAP_BIT_FEAT_I8MM */ // Int8 Matrix Multiply, optional from v8.1

    // ARMv8.7-A
    bool has_afp = FF_HAS_CAP(29); /* CAP_BIT_FEAT_AFP */ // Alternate FP16 (FEXPA), optional from v8.6

    // ARMv9.2-A
    bool has_sme = FF_HAS_CAP(40); /* CAP_BIT_FEAT_SME */ // Scalable Matrix Extension, optional from v9.2

    // ARMv9.3-A
    bool has_sme2 = FF_HAS_CAP(41); /* CAP_BIT_FEAT_SME2 */ // SME2, optional from v9.2

    // ARMv8.8-A
    bool has_hbc = FF_HAS_CAP(64); /* CAP_BIT_FEAT_HBC */ // Hinted conditional branches, optional from v8.7

    // ARMv8.9-A
    bool has_cssc = FF_HAS_CAP(67); /* CAP_BIT_FEAT_CSSC */ // Common Short String Compare, optional from v8.7

    // ARMv9.4-A+ are not exposed yet

    if (has_sve2 || has_sme) {
        // ARMv9 family
        if (has_sme2) {
            cpu->march = "ARMv9.3-A";
        } else if (has_sme) {
            cpu->march = "ARMv9.2-A";
        } else if (has_i8mm && has_bf16) {
            cpu->march = "ARMv9.1-A";
        } else {
            cpu->march = "ARMv9.0-A";
        }
    } else {
        // ARMv8 family
        if (has_cssc) {
            cpu->march = "ARMv8.9-A";
        } else if (has_hbc) {
            cpu->march = "ARMv8.8-A";
        } else if (has_afp) {
            cpu->march = "ARMv8.7-A";
        } else if (has_i8mm && has_bf16) {
            cpu->march = "ARMv8.6-A";
        } else if (has_bti && has_sb && has_dpb2 && has_flagm2 && has_frintts) {
            cpu->march = "ARMv8.5-A";
        } else if (has_lse2 && has_dit && has_flagm && has_lrcpc2) {
            cpu->march = "ARMv8.4-A";
        } else if (has_pauth && has_lrcpc && has_fcma && has_jscvt) {
            cpu->march = "ARMv8.3-A";
        } else if (has_fp16 && has_dpb) {
            cpu->march = "ARMv8.2-A";
        } else if (has_lse && has_crc32 && has_rdm) {
            cpu->march = "ARMv8.1-A";
        } else if (has_asimd && has_fp) {
            cpu->march = "ARMv8-A";
        }
    }

        #undef HAS_CAP
}
    #elif _WIN32
        #include <processthreadsapi.h>

        // Missing from winnt.h of MinGW-w64
        #define PF_ARM_LSE2_AVAILABLE 62
        #define PF_RESERVED_FEATURE 63
        #define PF_ARM_SHA3_INSTRUCTIONS_AVAILABLE 64
        #define PF_ARM_SHA512_INSTRUCTIONS_AVAILABLE 65
        #define PF_ARM_V82_I8MM_INSTRUCTIONS_AVAILABLE 66
        #define PF_ARM_V82_FP16_INSTRUCTIONS_AVAILABLE 67
        #define PF_ARM_V86_BF16_INSTRUCTIONS_AVAILABLE 68
        #define PF_ARM_V86_EBF16_INSTRUCTIONS_AVAILABLE 69
        #define PF_ARM_SME_INSTRUCTIONS_AVAILABLE 70
        #define PF_ARM_SME2_INSTRUCTIONS_AVAILABLE 71
        #define PF_ARM_SME2_1_INSTRUCTIONS_AVAILABLE 72
        #define PF_ARM_SME2_2_INSTRUCTIONS_AVAILABLE 73
        #define PF_ARM_SME_AES_INSTRUCTIONS_AVAILABLE 74
        #define PF_ARM_SME_SBITPERM_INSTRUCTIONS_AVAILABLE 75
        #define PF_ARM_SME_SF8MM4_INSTRUCTIONS_AVAILABLE 76
        #define PF_ARM_SME_SF8MM8_INSTRUCTIONS_AVAILABLE 77
        #define PF_ARM_SME_SF8DP2_INSTRUCTIONS_AVAILABLE 78
        #define PF_ARM_SME_SF8DP4_INSTRUCTIONS_AVAILABLE 79
        #define PF_ARM_SME_SF8FMA_INSTRUCTIONS_AVAILABLE 80
        #define PF_ARM_SME_F8F32_INSTRUCTIONS_AVAILABLE 81
        #define PF_ARM_SME_F8F16_INSTRUCTIONS_AVAILABLE 82
        #define PF_ARM_SME_F16F16_INSTRUCTIONS_AVAILABLE 83
        #define PF_ARM_SME_B16B16_INSTRUCTIONS_AVAILABLE 84
        #define PF_ARM_SME_F64F64_INSTRUCTIONS_AVAILABLE 85
        #define PF_ARM_SME_I16I64_INSTRUCTIONS_AVAILABLE 86
        #define PF_ARM_SME_LUTv2_INSTRUCTIONS_AVAILABLE 87
        #define PF_ARM_SME_FA64_INSTRUCTIONS_AVAILABLE 88

void ffCPUDetectByCpuid(FFCPUResult* cpu) {
    // ARMv8-A
    bool has_vfp = IsProcessorFeaturePresent(PF_ARM_VFP_32_REGISTERS_AVAILABLE);   // Implies basic FP support
    bool has_neon = IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE); // NEON (ASIMD)

    // ARMv8.1-A
    bool has_atomics = IsProcessorFeaturePresent(PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE); // LSE atomics
    bool has_crc32 = IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE);     // CRC32

    // ARMv8.2-A
    bool has_fp16 = IsProcessorFeaturePresent(PF_ARM_V82_FP16_INSTRUCTIONS_AVAILABLE); // Half-precision FP

    // ARMv8.3-A
    bool has_lrcpc = IsProcessorFeaturePresent(PF_ARM_V83_LRCPC_INSTRUCTIONS_AVAILABLE); // LDAPR/LR with RCPC semantics
    bool has_jscvt = IsProcessorFeaturePresent(PF_ARM_V83_JSCVT_INSTRUCTIONS_AVAILABLE); // FJCVTZS

    // ARMv8.4-A
    // My CPU (Apple M1 Pro in VM) does support LSE2, but Windows doesn't detect it for some reason
    bool has_lse2 = IsProcessorFeaturePresent(PF_ARM_LSE2_AVAILABLE);              // Large System Extensions version 2, optional from v8.2
    bool has_dp = IsProcessorFeaturePresent(PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE); // DotProd, optional from v8.1 (*)

    // ARMv9.0-A
    bool has_sve2 = IsProcessorFeaturePresent(PF_ARM_SVE2_INSTRUCTIONS_AVAILABLE); // SVE2

    // ARMv9.1-A
    // ARMv8.6-A
    bool has_bf16 = IsProcessorFeaturePresent(PF_ARM_V86_BF16_INSTRUCTIONS_AVAILABLE); // BF16, optional from v8.2
    bool has_i8mm = IsProcessorFeaturePresent(PF_ARM_V82_I8MM_INSTRUCTIONS_AVAILABLE); // Int8 matrix multiply, optional from v8.2

    // ARMv8.7-A
    bool has_ebf16 = IsProcessorFeaturePresent(PF_ARM_V86_EBF16_INSTRUCTIONS_AVAILABLE); // Extended BFloat16 behaviors, optional from v8.2

    // ARMv9.2-A
    bool has_sme = IsProcessorFeaturePresent(PF_ARM_SME_INSTRUCTIONS_AVAILABLE); // SME

    // ARMv9.3-A
    bool has_sme2 = IsProcessorFeaturePresent(PF_ARM_SME2_INSTRUCTIONS_AVAILABLE); // SME2

    // ARMv9.4-A
    bool has_sme2p1 = IsProcessorFeaturePresent(PF_ARM_SME2_1_INSTRUCTIONS_AVAILABLE); // SME2.1

    if (has_sve2 || has_sme) {
        // ARMv9 family
        if (has_sme2p1) {
            cpu->march = "ARMv9.4-A";
        } else if (has_sme2) {
            cpu->march = "ARMv9.3-A";
        } else if (has_sme) {
            cpu->march = "ARMv9.2-A";
        } else if (has_i8mm && has_bf16) {
            cpu->march = "ARMv9.1-A";
        } else {
            cpu->march = "ARMv9.0-A";
        }
    } else {
        // ARMv8 family
        if (has_ebf16) {
            cpu->march = "ARMv8.7-A";
        } else if (has_i8mm && has_bf16) {
            cpu->march = "ARMv8.6-A";
        } else if (has_dp && has_lse2) {
            cpu->march = "ARMv8.4-A";
        } else if (has_lrcpc && has_jscvt) {
            cpu->march = "ARMv8.3-A";
        } else if (has_fp16) {
            cpu->march = "ARMv8.2-A";
        } else if (has_atomics && has_crc32) {
            cpu->march = "ARMv8.1-A";
        } else if (has_neon && has_vfp) {
            cpu->march = "ARMv8-A";
        }
    }
}
    #else
void ffCPUDetectByCpuid(FF_A_UNUSED FFCPUResult* cpu) {
    // Unsupported system
}
    #endif

#else

void ffCPUDetectByCpuid(FF_A_UNUSED FFCPUResult* cpu) {
    // Unsupported architecture
}

#endif