fix: add SumsOf2 fallback for Highway < 1.1.0#4
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SumsOf2 (pairwise widen-and-add) was introduced in Highway 1.1.0 but some distro packages ship older versions. Add a compile-time fallback that implements the same semantics via store/scalar-add/load, gated on HWY_MAJOR/HWY_MINOR. On Highway >= 1.1.0 the native op is used with zero overhead. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
SumsOf2when building against Highway < 1.1.0hn::SumsOf2with zero overheadTest plan
simd.ocompiles cleanly with Highway 1.3.0 (native path)testSimd()to confirm correctness on both paths🤖 Generated with Claude Code