SIMD version of p448_bias

p448_bias-simd.c

void
p448_bias (
    p448_t *a,
    int amt
) {
    uint32_t co1 = ((1ull<<28)-1)*amt, co2 = co1-amt;
    uint32x4_t lo = {co1,co1,co1,co1}, hi = {co2,co1,co1,co1};
    uint32x4_t *aa = (uint32x4_t*) a;
    aa[0] += lo;
    aa[1] += lo;
    aa[2] += hi;
    aa[3] += lo;
}