Marco van de Voort wrote:
In our previous episode, Mark Morgan Lloyd said:
Actually, I have a vintage IBM PC 5150, with a 4.77 MHz 8088 processor,
so this isn't true, it's very testable actually :) However, the i8086
code generator still generates some 186/286+ instructions, so it doesn't
work there yet, but I'm planning to fix this shortly. Here's a video of
a few very simple Free Pascal compiled programs on a true 80186:
OK, answering my own question then. A pure-8086 port could be valuable
if it generated reliable code for something like vtprolog.pas, since
this implements its own garbage collection relying on detailed knowledge
of how Turbo Pascal manages its heap.
Heap management is mostly a RTL feature. For high TP compatibility, things
like calling conventions must also match.
Yes, but in the specific case I gave the program extends the heap
management. In practical terms it could be replaced with a mark/release
arrangement, since when the program is trying to find a solution based
on predefined rules it won't be extending them.
But as it stands it's a good test of TP-compatibility.
IOW 8086 codegeneration is not automatically full TP compatibility on the
binary level.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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