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 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