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Add Apple SME isa and vector length detects #363

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Merged
GregoryComer merged 3 commits into from
Jan 5, 2026
Merged

Add Apple SME isa and vector length detects #363

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1b12a03
Apple SME 2p1 and vector length detect
fbarchard Dec 30, 2025
cbb9add
Add Apple SME isa and vector length detects
fbarchard Dec 30, 2025
31caeb9
clang format applied
fbarchard Dec 30, 2025
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85 changes: 29 additions & 56 deletions src/arm/mach/init.c
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Original file line number Diff line number Diff line change
Expand Up @@ -362,10 +362,8 @@ void cpuinfo_arm_mach_init(void) {
* possible. Otherwise, fallback to hardcoded set of CPUs with known
* support.
*/
const uint32_t has_feat_lse = get_sys_info_by_name("hw.optional.arm.FEAT_LSE");
if (has_feat_lse != 0) {
cpuinfo_isa.atomics = true;
} else {
cpuinfo_isa.atomics = get_sys_info_by_name("hw.optional.arm.FEAT_LSE") != 0;
if (!cpuinfo_isa.atomics) {
// Mandatory in ARMv8.1-A, list only cores released before iOS
// 15 / macOS 12
switch (cpu_family) {
Expand All @@ -377,10 +375,8 @@ void cpuinfo_arm_mach_init(void) {
}
}

const uint32_t has_feat_rdm = get_sys_info_by_name("hw.optional.arm.FEAT_RDM");
if (has_feat_rdm != 0) {
cpuinfo_isa.rdm = true;
} else {
cpuinfo_isa.rdm = get_sys_info_by_name("hw.optional.arm.FEAT_RDM") != 0;
if (!cpuinfo_isa.rdm) {
// Optional in ARMv8.2-A (implemented in Apple cores),
// list only cores released before iOS 15 / macOS 12
switch (cpu_family) {
Expand All @@ -392,10 +388,8 @@ void cpuinfo_arm_mach_init(void) {
}
}

const uint32_t has_feat_fp16 = get_sys_info_by_name("hw.optional.arm.FEAT_FP16");
if (has_feat_fp16 != 0) {
cpuinfo_isa.fp16arith = true;
} else {
cpuinfo_isa.fp16arith = get_sys_info_by_name("hw.optional.arm.FEAT_FP16") != 0;
if (!cpuinfo_isa.fp16arith) {
// Optional in ARMv8.2-A (implemented in Apple cores),
// list only cores released before iOS 15 / macOS 12
switch (cpu_family) {
Expand All @@ -407,15 +401,11 @@ void cpuinfo_arm_mach_init(void) {
}
}

const uint32_t has_feat_fhm = get_sys_info_by_name("hw.optional.arm.FEAT_FHM");
if (has_feat_fhm != 0) {
cpuinfo_isa.fhm = true;
} else {
cpuinfo_isa.fhm = get_sys_info_by_name("hw.optional.arm.FEAT_FHM") != 0;
if (!cpuinfo_isa.fhm) {
// Prior to iOS 15, use 'hw.optional.armv8_2_fhm'
const uint32_t has_feat_fhm_legacy = get_sys_info_by_name("hw.optional.armv8_2_fhm");
if (has_feat_fhm_legacy != 0) {
cpuinfo_isa.fhm = true;
} else {
cpuinfo_isa.fhm = get_sys_info_by_name("hw.optional.armv8_2_fhm") != 0;
if (!cpuinfo_isa.fhm) {
// Mandatory in ARMv8.4-A when FP16 arithmetics is
// implemented, list only cores released before iOS 15 /
// macOS 12
Expand All @@ -427,64 +417,47 @@ void cpuinfo_arm_mach_init(void) {
}
}

const uint32_t has_feat_bf16 = get_sys_info_by_name("hw.optional.arm.FEAT_BF16");
if (has_feat_bf16 != 0) {
cpuinfo_isa.bf16 = true;
}

const uint32_t has_feat_fcma = get_sys_info_by_name("hw.optional.arm.FEAT_FCMA");
if (has_feat_fcma != 0) {
cpuinfo_isa.fcma = true;
} else {
// Mandatory in ARMv8.3-A, list only cores released before iOS
// 15 / macOS 12
cpuinfo_isa.bf16 = get_sys_info_by_name("hw.optional.arm.FEAT_BF16") != 0;
cpuinfo_isa.fcma = get_sys_info_by_name("hw.optional.arm.FEAT_FCMA") != 0;
if (!cpuinfo_isa.fcma) {
// Mandatory in ARMv8.3-A, list only cores released before iOS 15 / macOS 12
switch (cpu_family) {
case CPUFAMILY_ARM_LIGHTNING_THUNDER:
case CPUFAMILY_ARM_FIRESTORM_ICESTORM:
cpuinfo_isa.fcma = true;
}
}

const uint32_t has_feat_jscvt = get_sys_info_by_name("hw.optional.arm.FEAT_JSCVT");
if (has_feat_jscvt != 0) {
cpuinfo_isa.jscvt = true;
} else {
// Mandatory in ARMv8.3-A, list only cores released before iOS
// 15 / macOS 12
cpuinfo_isa.jscvt = get_sys_info_by_name("hw.optional.arm.FEAT_JSCVT") != 0;
if (!cpuinfo_isa.jscvt) {
// Mandatory in ARMv8.3-A, list only cores released before iOS 15 / macOS 12
switch (cpu_family) {
case CPUFAMILY_ARM_LIGHTNING_THUNDER:
case CPUFAMILY_ARM_FIRESTORM_ICESTORM:
cpuinfo_isa.jscvt = true;
}
}

const uint32_t has_feat_dotprod = get_sys_info_by_name("hw.optional.arm.FEAT_DotProd");
if (has_feat_dotprod != 0) {
cpuinfo_isa.dot = true;
} else {
// Mandatory in ARMv8.4-A, list only cores released before iOS
// 15 / macOS 12
cpuinfo_isa.dot = get_sys_info_by_name("hw.optional.arm.FEAT_DotProd") != 0;
if (!cpuinfo_isa.dot) {
// Mandatory in ARMv8.4-A, list only cores released before iOS 15 / macOS 12
switch (cpu_family) {
case CPUFAMILY_ARM_LIGHTNING_THUNDER:
case CPUFAMILY_ARM_FIRESTORM_ICESTORM:
cpuinfo_isa.dot = true;
}
}

const uint32_t has_feat_i8mm = get_sys_info_by_name("hw.optional.arm.FEAT_I8MM");
if (has_feat_i8mm != 0) {
cpuinfo_isa.i8mm = true;
}

const uint32_t has_feat_sme = get_sys_info_by_name("hw.optional.arm.FEAT_SME");
if (has_feat_sme != 0) {
cpuinfo_isa.sme = true;
}
cpuinfo_isa.i8mm = get_sys_info_by_name("hw.optional.arm.FEAT_I8MM") != 0;
cpuinfo_isa.sme = get_sys_info_by_name("hw.optional.arm.FEAT_SME") != 0;
cpuinfo_isa.sme2 = get_sys_info_by_name("hw.optional.arm.FEAT_SME2") != 0;
cpuinfo_isa.sme2p1 = get_sys_info_by_name("hw.optional.arm.FEAT_SME2p1") != 0;
cpuinfo_isa.sme_i16i32 = get_sys_info_by_name("hw.optional.arm.SME_I16I32") != 0;
cpuinfo_isa.sme_bi32i32 = get_sys_info_by_name("hw.optional.arm.SME_BI32I32") != 0;
cpuinfo_isa.sme_b16b16 = get_sys_info_by_name("hw.optional.arm.FEAT_SME_B16B16") != 0;
cpuinfo_isa.sme_f16f16 = get_sys_info_by_name("hw.optional.arm.FEAT_SME_F16F16") != 0;

const uint32_t has_feat_sme2 = get_sys_info_by_name("hw.optional.arm.FEAT_SME2");
if (has_feat_sme2 != 0) {
cpuinfo_isa.sme2 = true;
}
cpuinfo_isa.smelen = get_sys_info_by_name("hw.optional.arm.sme_max_svl_b");

uint32_t num_clusters = 1;
for (uint32_t i = 0; i < mach_topology.cores; i++) {
Expand Down
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