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fix: Detection of HW caps and Num Cpus for FreeBSD(R) and OpenBSD(R) #1269

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fix: Detection of HW caps and Num Cpus for FreeBSD(R) and OpenBSD(R) #1269

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25 changes: 22 additions & 3 deletions src/common/cpuinfo/CpuInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -435,9 +435,28 @@ CpuInfo CpuInfo::build()
std::vector<CpuModel> cpus_model(1, midr_to_model(midr));
CpuInfo info(isa, cpus_model);
return info;
#elif defined(__aarch64__) && (defined(__OpenBSD__) || defined(__FreeBSD__) || \
defined(__APPLE__)) /* #elif(BARE_METAL) && defined(__aarch64__) */
int ncpus = get_hw_capability("hw.perflevel0.logicalcpu");

#elif defined(__aarch64__) && (defined(__OpenBSD__) || defined(__FreeBSD__))
/* #elif(BARE_METAL) && defined(__aarch64__) */
int ncpus = get_hw_capability("hw.ncpu");
CpuIsaInfo isainfo;
std::vector<CpuModel> cpus_model(ncpus);
isainfo.neon = get_hw_capability("hw.optional.neon");
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@gunes-arm gunes-arm Mar 16, 2026

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Does this work in FreeBSD? I know it doesn't work for OpenBSD.

#1223 (comment)
says you can use elf_aux_info to detect the HWCAPS.

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@Martinfx Martinfx Mar 16, 2026 •
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I will work for better implementation

isainfo.fp16 = get_hw_capability("hw.optional.neon_fp16");
isainfo.dot = get_hw_capability("hw.optional.arm.FEAT_DotProd");
isainfo.bf16 = get_hw_capability("hw.optional.arm.FEAT_BF16");
isainfo.i8mm = get_hw_capability("hw.optional.arm.FEAT_I8MM");
isainfo.sme = get_hw_capability("hw.optional.arm.FEAT_SME");
isainfo.sme_f32f32 = get_hw_capability("hw.optional.arm.SME_F32F32");
isainfo.sme_b16f32 = get_hw_capability("hw.optional.arm.SME_B16F32");
isainfo.sme_f16f32 = get_hw_capability("hw.optional.arm.SME_F16F32");
isainfo.sme_i8i32 = get_hw_capability("hw.optional.arm.SME_I8I32");
isainfo.sme2 = get_hw_capability("hw.optional.arm.FEAT_SME2");
CpuInfo info(isainfo, cpus_model);
return info;

#elif defined(__aarch64__) && defined(__APPLE__)
int ncpus = get_hw_capability("hw.perflevel0.logicalcpu");
CpuIsaInfo isainfo;
std::vector<CpuModel> cpus_model(ncpus);
isainfo.neon = get_hw_capability("hw.optional.neon");
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