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#include "dot_product_simple.h"
namespace {
template <typename Res, typename Number>
static Res DotProductSimpleImpl(const Number* lhs, const Number* rhs, size_t length) noexcept {
Res s0 = 0;
Res s1 = 0;
Res s2 = 0;
Res s3 = 0;
while (length >= 4) {
s0 += static_cast<Res>(lhs[0]) * static_cast<Res>(rhs[0]);
s1 += static_cast<Res>(lhs[1]) * static_cast<Res>(rhs[1]);
s2 += static_cast<Res>(lhs[2]) * static_cast<Res>(rhs[2]);
s3 += static_cast<Res>(lhs[3]) * static_cast<Res>(rhs[3]);
lhs += 4;
rhs += 4;
length -= 4;
}
while (length--) {
s0 += static_cast<Res>(*lhs++) * static_cast<Res>(*rhs++);
}
return s0 + s1 + s2 + s3;
}
}
float DotProductSimple(const float* lhs, const float* rhs, size_t length) noexcept {
return DotProductSimpleImpl<float, float>(lhs, rhs, length);
}
double DotProductSimple(const double* lhs, const double* rhs, size_t length) noexcept {
return DotProductSimpleImpl<double, double>(lhs, rhs, length);
}
ui32 DotProductUI4Simple(const ui8* lhs, const ui8* rhs, size_t lengtInBytes) noexcept {
ui32 res = 0;
for (size_t i = 0; i < lengtInBytes; ++i) {
res += static_cast<ui32>(lhs[i] & 0x0f) * static_cast<ui32>(rhs[i] & 0x0f);
res += static_cast<ui32>(lhs[i] & 0xf0) * static_cast<ui32>(rhs[i] & 0xf0) >> 8;
}
return res;
}
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