Function core_arch::x86::_mm_cmpeq_ss

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

This is supported on x86 and target feature sse only.

Compares the lowest f32 of both inputs for equality. The lowest 32 bits of the result will be 0xffffffff if the two inputs are equal, or 0 otherwise. The upper 96 bits of the result are the upper 96 bits of a.

Intel's documentation