The value of opt specifies the optimization level for the funcname subprograms. You can assign opt levels zero, one, two three, four, and five. You can turn off optimization by setting level to 0. The funcname subprograms must be prototyped prior to the pragma.
The level of optimization for any function listed in the pragma is reduced to the value of -xmaxopt. The pragma is ignored when -xmaxopt=off.