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Adding a word memory location to another word memory location.

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This commit is contained in:
Chris Pressey 2017-12-07 13:15:21 +00:00
parent 92525fd482
commit a4fd0e590b
5 changed files with 72 additions and 13 deletions
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5
HISTORY.markdown
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@ -1,6 +1,11 @@
History of SixtyPical
=====================
0.9
---
* Add word (constant or memory location) to word memory location.
0.8
---

6
README.markdown
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@ -40,11 +40,11 @@ Documentation
TODO
----
### Add 16 bit values.
### Operations on 16 bit values
I guess this means making `add` a bit more like `copy`.
Add word (constant or memory location) to pointer. (Not necessarily range-checked yet though.)
And then: add to pointer. (Not necessarily range-checked yet though.)
Compare word (constant or memory location) with memory location or pointer. (Maybe?)
And then write a little demo "game" where you can move a block around the screen with
the joystick.

28
src/sixtypical/compiler.py
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@ -147,14 +147,26 @@ class Compiler(object):
self.emitter.emit(ADC(Immediate(Byte(src.value))))
else:
self.emitter.emit(ADC(Absolute(self.labels[src.name])))
elif isinstance(src, ConstantRef) and isinstance(dest, LocationRef) and dest.type == TYPE_WORD:
dest_label = self.labels[dest.name]
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(ADC(Immediate(Byte(src.low_byte()))))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
self.emitter.emit(ADC(Immediate(Byte(src.high_byte()))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
elif isinstance(dest, LocationRef) and dest.type == TYPE_WORD and src.type == TYPE_WORD:
if isinstance(src, ConstantRef):
dest_label = self.labels[dest.name]
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(ADC(Immediate(Byte(src.low_byte()))))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
self.emitter.emit(ADC(Immediate(Byte(src.high_byte()))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
elif isinstance(src, LocationRef):
src_label = self.labels[src.name]
dest_label = self.labels[dest.name]
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(ADC(Absolute(src_label)))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
self.emitter.emit(ADC(Absolute(Offset(src_label, 1))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
else:
raise UnsupportedOpcodeError(instr)
else:
raise UnsupportedOpcodeError(instr)
elif opcode == 'sub':

28
tests/SixtyPical Analysis.md
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@ -412,6 +412,34 @@ To be sure, `add`ing a word constant to a word memory location trashes `a`.
| }
? ForbiddenWriteError: a in main
You can `add` a word memory location to another word memory location.
| word score
| word delta
| routine main
| inputs score, delta
| outputs score
| trashes a, c, z, v, n
| {
| st off, c
| add score, delta
| }
= ok
`add`ing a word memory location to a word memory location trashes `a`.
| word score
| word delta
| routine main
| inputs score, delta
| outputs score
| trashes c, z, v, n
| {
| st off, c
| add score, delta
| }
? ForbiddenWriteError: a in main
### sub ###
Can't `sub` from or to a memory location that isn't initialized.

18
tests/SixtyPical Compilation.md
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@ -344,11 +344,11 @@ goto.
### word operations
Adding a constant word to a memory location.
Adding a constant word to a word memory location.
| word score
| routine main
| inputs a, score
| inputs score
| outputs score
| trashes a, c, z, v, n
| {
@ -357,6 +357,20 @@ Adding a constant word to a memory location.
| }
= 00c018ad12c069cf8d12c0ad13c069078d13c060
Adding a word memory location to another word memory location.
| word score
| word delta
| routine main
| inputs score, delta
| outputs score
| trashes a, c, z, v, n
| {
| st off, c
| add score, delta
| }
= 00c018ad14c06d16c08d14c0ad15c06d17c08d15c060
### Buffers and Pointers
Load address into pointer.