Function _mm_fnmsub_ss

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

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

Multiplies the lower single-precision (32-bit) floating-point elements in a and b, and subtract packed elements in c from the negated intermediate result. 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