public static double sum(ReadOnlySpan <double> src)
{
var veclen = Vec128 <double> .Length;
var seglen = 2 * veclen;
var srclen = src.Length;
require(0 == srclen % seglen);
var dst = Vec128.Fill((double)0);
var offset = 0;
for (var i = 0; i < srclen; i += seglen)
{
var v1 = Vec128.Load(src, offset);
offset += veclen;
var v2 = Vec128.Load(src, offset);
offset += veclen;
var vSum = dfp.hadd(v1, v2);
dst = dfp.add(dst, vSum);
}
Span <double> final = stackalloc double[veclen];
vstore(dst, ref final[0]);
var total = (double)0;
for (var i = 0; i < veclen; i++)
{
total += final[i];
}
return(total);
}
static Vec128 <float> CalcFpSignMask32() => Vec128.Fill(-0.0f);
static Vec128 <double> CalcFpSignMask64() => Vec128.Fill(-0.0);
