`cmp` can compare against a literal word.
Chris Pressey
4 years ago
| 9 | 9 |
* When the range of a location is known, `inc` and `dec`
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| 10 | 10 |
on it will usually shift the known instead of invalidating it.
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| 11 | 11 |
* `cmp` instruction can now perform a 16-bit unsigned comparison
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| 12 | |
of `word` memory locations (at the cost of trashing `a`.)
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12 |
of `word` memory locations and `word` literals (at the cost of
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13 |
trashing the `a` register.)
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| 13 | 14 |
* Fixed pathological memory use in the lexical scanner - should
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| 14 | 15 |
be much less inefficient now when parsing large source files.
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| 15 | 16 |
* Reorganized the examples in `eg/rudiments/` to make them
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| 399 | 399 |
self.emitter.emit(BNE(Relative(end_label)))
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| 400 | 400 |
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
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| 401 | 401 |
self.emitter.emit(CMP(Absolute(Offset(src_label, 1))))
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402 |
self.emitter.resolve_label(end_label)
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403 |
return
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404 |
if isinstance(src, ConstantRef) and src.type == TYPE_WORD:
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405 |
dest_label = self.get_label(dest.name)
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406 |
self.emitter.emit(LDA(Absolute(dest_label)))
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407 |
self.emitter.emit(CMP(Immediate(Byte(src.high_byte()))))
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408 |
end_label = Label('end_label')
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409 |
self.emitter.emit(BNE(Relative(end_label)))
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410 |
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
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411 |
self.emitter.emit(CMP(Immediate(Byte(src.low_byte()))))
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| 402 | 412 |
self.emitter.resolve_label(end_label)
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| 403 | 413 |
return
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| 404 | 414 |
cls = {
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