Creates a 2-bit mask from the most significant bits of the two, double-precision floating-point values of A, as follows:

int i = move_mask(F64vec2 A)

i := sign(a1)<<1 | sign(a0)<<0

Corresponding intrinsic: _mm_movemask_pd

Creates a 4-bit mask from the most significant bits of the four, single-precision floating-point values of A, as follows:

int i = move_mask(F32vec4 A)

i := sign(a3)<<3 | sign(a2)<<2 | sign(a1)<<1 | sign(a0)<<0

Corresponding intrinsic: _mm_movemask_ps