Mitchell Hashimoto 00dfd67bee pkg/highway: replace resolveTargetQuery with direct CPU detection ...

The previous runtime_detect.zig called std.zig.system.resolveTargetQuery
which pulled in the entire Zig target/CPU model table infrastructure for
every architecture (~4,000 symbols, ~175 KB of data tables, ~130 KB of
code). This bloated the binary by ~500 KB and shifted code layout enough
to cause a measurable icache/branch-predictor regression in unrelated
hot paths like the terminal parser (~20% more cycles for identical
instruction counts).

Replace with minimal, direct CPU feature detection per architecture:
CPUID + XGETBV inline assembly on x86, sysctlbyname on Darwin AArch64,
and getauxval/prctl via std.os.linux (direct syscalls, no libc) on
Linux for AArch64, PPC, S390x, RISC-V, and LoongArch.

Split into per-architecture files under src/detect/ for
maintainability.

2026-04-23 21:23:12 -07:00

..

cpp

pkg/highway: vendor and modify to remain all libc usage

2026-04-23 20:28:43 -07:00

detect

pkg/highway: replace resolveTargetQuery with direct CPU detection

2026-04-23 21:23:12 -07:00

detect.zig

pkg/highway: replace resolveTargetQuery with direct CPU detection

2026-04-23 21:23:12 -07:00

main.zig

pkg/highway: expand detection to all platforms not just darwin

2026-04-23 15:28:59 -07:00

targets.zig

pkg/highway: Darwin builds don't rely on Apple headers

2026-04-23 15:05:38 -07:00