Function _mm_max_ss

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

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

Compares the first single-precision (32-bit) floating-point element of a and b, and return the maximum value in the first element of the return value, the other elements are copied from a.

Intel’s documentation