On 3/24/2020 2:02 PM, Binyamin Dissen wrote:
PC invoked? - pretty much anything. It really annoyed me that IBM trumpeted support for 64 bit callers for many services when the hardware did all the work.
Not true. In order for a service to officially support 64-bit callers, IBM must assign people to write test plans and validate every possible scenario. At a minimum, the macros and/or the code behind them must ensure garbage high-halves are not passed back in return registers.
Plus, most 64-bit callers expect to be able to pass parameters from their working storage areas (i.e., above the "bar"). Unchanged PCs hat are simply validated and nothing more will require special handling by 64-bit callers to ensure all parameters reside in 31-bit storage. That's lame support at best. Full support implies new parameter lists that allow 8-byte pointers and such.
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