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StanWarford / pep9suite

Pep9Suite is a suite of software for the Pep/9 virtual machine described in the text Computer Systems, J. Stanley Warford, fifth edition.
http://computersystemsbook.com
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Fix RETTR status bits. #81

Closed Matthew-McRaven closed 5 years ago

Matthew-McRaven commented 5 years ago

Fix bug where NZVCS are improperly restored when the system stack is even-aligned.

I fixed this bug in Pep10, but have not had a chance to regression test Pep9. I created this fix via the online editor so I do not know that it will fix Pep9 for certain.

Matthew-McRaven commented 5 years ago

This fix works as expected, without breaking existing programs.