On Tue, 5 May 2015 08:59:00 -0400, Brite wrote: >We have some assembler programs written in 64-bit mode
Do you mean that they run AMODE(64)? >(using 64-bit mode instructions) I think you may be confusing AMODE(64) with using 64-bit registers. >since they allocate storage above 2G line to put some tables. >But we still link-edit them with AMODE 31. Is this OK? Yes, as long as you switch to AMODE(64) so that you can access those tables. >When we test that, it's very slow. How slow? How does the CPU time compare to what it was before they were converted to run in 64-bit mode? >Any concern besides the performance issue? The "performance issue" should be small. Likely difficult to measure. -- Tom Marchant
