Function _mm_cmpunord_ss

pub unsafe fn _mm_cmpunord_ss(a: __m128, b: __m128) -> __m128

Available on (x86 or x86-64) and target feature sse and x86-64 only.

Checks if the lowest f32 of both inputs are unordered. The lowest 32 bits of the result will be 0xffffffff if any of a.extract(0) or b.extract(0) is a NaN, or 0 otherwise. The upper 96 bits of the result are the upper 96 bits of a.

Intel’s documentation