Reset the floating-point processor to the default state needed to get correct Ada semantics for the target. Some third party tools change the settings for the floating-point processor. Reset can be called to reset the floating-point processor into the mode required by GNAT for correct operation. Use this call after a call to foreign code if you suspect incorrect floating-point operation after the call.

For example under Windows NT some system DLL calls change the default FPU arithmetic to 64 bit precision mode. However, since in Ada 95 it is required to provide full access to the floating-point types of the architecture, GNAT requires full 80-bit precision mode, and Reset makes sure this mode is established.

Similarly on the PPC processor, it is important that overflow and underflow exceptions be disabled.

The call to Reset simply has no effect if the target environment does not give rise to such concerns.