internal static v128 equals_mask_long(v128 x, v128 y)
{
if (Sse4_1.IsSse41Supported)
{
return(Sse4_1.cmpeq_epi64(x, y));
}
else if (Sse2.IsSse2Supported)
{
v128 cmpeq32 = Sse2.cmpeq_epi32(x, y);
cmpeq32 = Sse2.and_si128(cmpeq32, Sse2.srli_epi64(cmpeq32, 32));
return(Sse2.shuffle_epi32(cmpeq32, Sse.SHUFFLE(2, 2, 0, 0)));
}
else
{
throw new CPUFeatureCheckException();
}
}
public static long2 intpow(long2 x, ulong2 n)
{
if (Sse2.IsSse2Supported)
{
v128 ZERO = long2.zero;
v128 ONE = new long2(1);
v128 doneMask = ZERO;
v128 result = ZERO;
v128 p = x;
v128 y = ONE;
Loop:
v128 y_times_p = Operator.mul_long(y, p);
y = Mask.BlendV(y, y_times_p, Operator.equals_mask_long(ONE, ONE & n));
n >>= 1;
v128 n_is_zero = Sse4_1.cmpeq_epi64(ZERO, n);
result = Mask.BlendV(result, y, Sse2.andnot_si128(doneMask, n_is_zero));
doneMask = n_is_zero;
if (bitmask32(2 * sizeof(long)) != Sse2.movemask_epi8(doneMask))
{
p = Operator.mul_long(p, p);
goto Loop;
}
else
{
return(result);
}
}
else
{
return(new long2(intpow(x.x, n.x), intpow(x.y, n.y)));
}
}
