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fix README.md 2015/endoh3

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Landon Curt Noll committed 2023-03-24 21:32:26 -07:00
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@@ -49,13 +49,14 @@ This program is a joke PDP-11 emulator. ("ll-dpd" is embedded in the code. Rea
You got it? This program is supposed to be used in this way: You got it? This program is supposed to be used in this way:
$ wget http://ioccc.org/1984/mullender.c ```sh
$ clang -o prog prog.c mullender.c wget http://ioccc.org/1984/mullender.c
$ ./prog clang -o prog prog.c mullender.c
./prog
```
You can enjoy the legendary winner of the first IOCCC, again. You can enjoy the legendary winner of the first IOCCC, again.
### Internal ### Internal
This program uses `__attribute__((constructor))`, which is a GCC extension, to hijack the main function call. And then it interprets main as an instruction sequence. This program uses `__attribute__((constructor))`, which is a GCC extension, to hijack the main function call. And then it interprets main as an instruction sequence.
@@ -77,7 +78,6 @@ It supports the minimal subset of instructions and addressing modes which are ne
* 4: Autodecrement deferred * 4: Autodecrement deferred
* 6: Index (incomplete) * 6: Index (incomplete)
### Limitation ### Limitation
Non-trivial combination of instruction and addressing mode may cause undefined behavior (unsequenced modification), such as attempting to autoincrement a destination register. Index addressing mode works well only for R7 (PC register). Non-trivial combination of instruction and addressing mode may cause undefined behavior (unsequenced modification), such as attempting to autoincrement a destination register. Index addressing mode works well only for R7 (PC register).