I think VM/370 (CP or CMS, perhaps both) used to rely on the CC after a calls to internal routines.
As a debugger, since it's tracing the instructions, I wouldn't be surprised if it knew exactly which instruction set the CC. On 2022-05-10 2:29 p.m., Paul Gilmartin wrote (snipped):
What if there are multiple code paths to the BC? (I had one co-worker perverse enough to rely on the CC after a subroutine return. He reset the program Mask before the BR 14 and I had to support it on a 370.)
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