Short pointer mode applications in long pointer mode environments

A computer program product for facilitating processing in a computing environment, said computer program product comprising:

• a computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
• performing a plurality of actions to prepare an application defined as a short pointer mode application for execution in a long pointer mode environment, the plurality of actions including:
• allocating memory for one or more in-memory short pointers of the application, the memory being allocated for an in-memory short pointer being of a size corresponding to a size of the in-memory short pointer;
• and
• allocating a register for an in-register short pointer of the application, the register being allocated at a size corresponding to a long pointer mode, the size corresponding to the long pointer mode being different from the size of the in-memory short pointer.