Support branching and looping on the `n` flag.
Chris Pressey
3 years ago
| 8 | 8 |
* Added `nop` opcode, which compiles to `NOP` (mainly for timing.)
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| 9 | 9 |
* Accessing zero-page with `ld` and `st` generates zero-page opcodes.
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| 10 | 10 |
* A `byte` or `word` table can be initialized with a list of constants.
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11 |
* Branching and repeating on the `n` flag is now supported.
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| 11 | 12 |
* Specifying multiple SixtyPical source files will produce a single
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| 12 | 13 |
compiled result from their combination.
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| 13 | 14 |
* Rudimentary support for Atari 2600 prelude in a 4K cartridge image,
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| 14 | |
and start of an example program in `eg/atari2600` directory.
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15 |
and an example program in `eg/atari2600` directory.
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| 15 | 16 |
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| 16 | 17 |
0.14
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| 17 | 18 |
----
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| 80 | 80 |
repeat {
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| 81 | 81 |
st a, WSYNC
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| 82 | 82 |
dec x
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| 83 | |
} until z // FIXME orig loop used "bpl _wsync_loop"
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83 |
} until n
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| 84 | 84 |
st a, WSYNC
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| 85 | 85 |
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| 86 | 86 |
//;
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| 14 | 14 |
CLC, SEC, ADC, SBC, ROL, ROR,
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| 15 | 15 |
INC, INX, INY, DEC, DEX, DEY,
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| 16 | 16 |
CMP, CPX, CPY, AND, ORA, EOR,
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| 17 | |
BCC, BCS, BNE, BEQ,
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17 |
BCC, BCS, BNE, BEQ, BPL, BMI,
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| 18 | 18 |
JMP, JSR, RTS,
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| 19 | 19 |
SEI, CLI,
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| 20 | 20 |
NOP,
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| 517 | 517 |
False: {
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| 518 | 518 |
'c': BCC,
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| 519 | 519 |
'z': BNE,
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|
520 |
'n': BPL,
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| 520 | 521 |
},
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| 521 | 522 |
True: {
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| 522 | 523 |
'c': BCS,
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| 523 | 524 |
'z': BEQ,
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|
525 |
'n': BMI,
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| 524 | 526 |
},
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| 525 | 527 |
}[instr.inverted].get(instr.src.name)
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| 526 | 528 |
if cls is None:
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| 547 | 549 |
False: {
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| 548 | 550 |
'c': BCC,
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| 549 | 551 |
'z': BNE,
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|
552 |
'n': BPL,
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| 550 | 553 |
},
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| 551 | 554 |
True: {
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| 552 | 555 |
'c': BCS,
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| 553 | 556 |
'z': BEQ,
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|
557 |
'n': BMI,
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| 554 | 558 |
},
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| 555 | 559 |
}[instr.inverted].get(instr.src.name)
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| 556 | 560 |
if cls is None:
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