Handling multiply-add operations

By default, the compiler generates a single non-IEEE 754 compatible multiply-add instruction for expressions such as a+b*c, partly because one instruction is faster than two. Because no rounding occurs between the multiply and add operations, this may also produce a more precise result. However, the increased precision might lead to different results from those obtained in other environments, and may cause x*y-x*y to produce a nonzero result. To avoid these issues, you can suppress the generation of multiply-add instructions by using the -qfloat=nomaf option.