68 lines
2.2 KiB
TypeScript
68 lines
2.2 KiB
TypeScript
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/**
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* Google Highway — portable SIMD intrinsics with runtime dispatch. Used by
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* bun's string search (indexOf fastpaths), base64 codec, and the bundler's
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* chunk hashing.
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*
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* Highway compiles every function for multiple targets (SSE2/AVX2/NEON/etc.)
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* and picks at runtime. Unlike zlib-ng it needs NO per-file `-m` flags or
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* generated config — `hwy/foreach_target.h` re-includes each TU body once
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* per ISA wrapped in `#pragma clang attribute push(target("..."))`, so a
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* single baseline compile per .cc emits all variants.
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*/
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import type { Dependency, DirectBuild } from "../source.ts";
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const HIGHWAY_COMMIT = "2607d3b5b0113992fe84d3848859eae13b3b52c1";
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export const highway: Dependency = {
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name: "highway",
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source: () => ({
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kind: "github-archive",
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repo: "google/highway",
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commit: HIGHWAY_COMMIT,
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}),
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patches: ["patches/highway/silence-warnings.patch"],
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build: cfg => {
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const spec: DirectBuild = {
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kind: "direct",
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lang: "cxx",
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pic: true,
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sources: [
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"hwy/abort.cc",
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"hwy/aligned_allocator.cc",
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"hwy/nanobenchmark.cc",
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"hwy/per_target.cc",
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"hwy/perf_counters.cc",
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"hwy/print.cc",
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"hwy/profiler.cc",
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"hwy/targets.cc",
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"hwy/timer.cc",
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],
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includes: ["."],
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defines: { HWY_STATIC_DEFINE: true },
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// -fno-exceptions / -fmath-errno aren't CLOptions (clang-cl warns
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// "unknown argument ignored"). globalFlags supplies /EHs-c- and /GR-
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// on Windows; upstream's MSVC branch additionally sets the STL macro.
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cflags: cfg.windows ? ["-D_HAS_EXCEPTIONS=0"] : ["-fno-exceptions", "-fmath-errno"],
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};
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// clang-cl on arm64-windows doesn't define __ARM_NEON even though NEON
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// intrinsics work. Highway's cpu-feature detection is gated on the macro,
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// so without it you get a scalar-only build. The underlying clang does
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// support NEON here — it's a clang-cl frontend quirk.
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if (cfg.windows && cfg.arm64) spec.cflags!.push("-D__ARM_NEON=1");
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return spec;
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},
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provides: () => ({
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libs: [],
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// Highway's public header is <hwy/highway.h> but it includes siblings
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// via "" paths — need both the root and the hwy/ subdir in -I.
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includes: [".", "hwy"],
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}),
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};
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