__vpmsumd

Purpose

Performs the exclusive-OR operation on each even-odd pair of the polynomial-multiplication result of corresponding elements.

vector unsigned long long __vpmsumd (vector unsigned long long a, vector unsigned long long b);

For each i (0 <= i < 2), let prod[i] be the result of polynomial multiplication of doubleword elements i of a and b.

Bit 0 of the result is set to 0.

Bits 1 - 127 of the result are set to prod[0] (xor) prod[1].