On Wed, 17 Oct 2018 15:20:44 -0700, Charles Mills wrote: >And FWIW there is another overlapping complexity here besides AMODE 64 -- >speaking in theory only, because there is no reality of 64-bit COBOL. > >... A program could be AMODE 31 but either destroy the high halves of a >caller's registers and/or expect a called program to preserve the high halves >of its registers. (There are many common uses of all 64 bits of a register >outside of AMODE 64.) > Sounds like a "Don't do that!" Must a 31-bit caller not depend on both halves of R2-R13 being preserved by a 31-bit subroutine?
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