Add the lower single-precision (32-bit) floating-point element in a and b, store the result in the lower element of result, and copy the upper 3 packed elements from a to the upper elements of result.
See Implementation
Add the lower single-precision (32-bit) floating-point element in a and b, store the result in the lower element of result, and copy the upper 3 packed elements from a to the upper elements of result.