Function core::arch::x86_64::_mm_fnmadd_ss

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

This is supported on x86-64 and target feature fma only.

Multiply the lower single-precision (32-bit) floating-point elements in a and b, and add the negated intermediate result to the lower element in c. Store the result in the lower element of the returned value, and copy the 3 upper elements from a to the upper elements of the result.

Intel's documentation