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fix: add SumsOf2 fallback for Highway < 1.1.0 #669

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fix: add SumsOf2 fallback for Highway < 1.1.0 #669

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30 changes: 30 additions & 0 deletions src/simd.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,36 @@ namespace HWY_NAMESPACE {

namespace hn = hwy::HWY_NAMESPACE;

// SumsOf2 pairwise-adds adjacent lanes into the next-wider type
// (u8 pairs -> u16, u16 pairs -> u32). Available since Highway 1.1.0;
// provide a portable fallback for older versions.
#if !defined(HWY_MAJOR) || HWY_MAJOR < 1 || (HWY_MAJOR == 1 && HWY_MINOR < 1)

template <class V>
HWY_API hn::VFromD<hn::Repartition<hwy::MakeWide<hn::TFromV<V>>,
hn::DFromV<V>>>
SumsOf2Fallback(V v) {
using T = hn::TFromV<V>;
using TW = hwy::MakeWide<T>;
using D = hn::DFromV<V>;
using DW = hn::Repartition<TW, D>;
const D d;
const DW dw;
const size_t N = hn::Lanes(d);
HWY_ALIGN T buf[hn::MaxLanes(d)];
hn::Store(v, d, buf);
HWY_ALIGN TW wbuf[hn::MaxLanes(dw)];
for (size_t i = 0; i < N / 2; ++i) {
wbuf[i] = static_cast<TW>(buf[2 * i]) + static_cast<TW>(buf[2 * i + 1]);
}
return hn::Load(dw, wbuf);
}
#define SumsOf2 SumsOf2Fallback

#else
using hn::SumsOf2;
#endif

void CountQualityMetricsImpl(const char* qualstr, const char* seqstr, int len,
char qualThreshold, int& lowQualNum, int& nBaseNum,
int& totalQual) {
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