Adding a word memory location to another word memory location.
Chris Pressey
7 years ago
| 0 | 0 | History of SixtyPical |
| 1 | 1 | ===================== |
| 2 | ||
| 3 | 0.9 | |
| 4 | --- | |
| 5 | ||
| 6 | * Add word (constant or memory location) to word memory location. | |
| 2 | 7 | |
| 3 | 8 | 0.8 |
| 4 | 9 | --- |
| 39 | 39 | TODO |
| 40 | 40 | ---- |
| 41 | 41 | |
| 42 | ### Add 16 bit values. | |
| 42 | ### Operations on 16 bit values | |
| 43 | 43 | |
| 44 | I guess this means making `add` a bit more like `copy`. | |
| 44 | Add word (constant or memory location) to pointer. (Not necessarily range-checked yet though.) | |
| 45 | 45 | |
| 46 | And then: add to pointer. (Not necessarily range-checked yet though.) | |
| 46 | Compare word (constant or memory location) with memory location or pointer. (Maybe?) | |
| 47 | 47 | |
| 48 | 48 | And then write a little demo "game" where you can move a block around the screen with |
| 49 | 49 | the joystick. |
| 146 | 146 | self.emitter.emit(ADC(Immediate(Byte(src.value)))) |
| 147 | 147 | else: |
| 148 | 148 | self.emitter.emit(ADC(Absolute(self.labels[src.name]))) |
| 149 | elif isinstance(src, ConstantRef) and isinstance(dest, LocationRef) and dest.type == TYPE_WORD: | |
| 150 | dest_label = self.labels[dest.name] | |
| 151 | self.emitter.emit(LDA(Absolute(dest_label))) | |
| 152 | self.emitter.emit(ADC(Immediate(Byte(src.low_byte())))) | |
| 153 | self.emitter.emit(STA(Absolute(dest_label))) | |
| 154 | self.emitter.emit(LDA(Absolute(Offset(dest_label, 1)))) | |
| 155 | self.emitter.emit(ADC(Immediate(Byte(src.high_byte())))) | |
| 156 | self.emitter.emit(STA(Absolute(Offset(dest_label, 1)))) | |
| 149 | elif isinstance(dest, LocationRef) and dest.type == TYPE_WORD and src.type == TYPE_WORD: | |
| 150 | if isinstance(src, ConstantRef): | |
| 151 | dest_label = self.labels[dest.name] | |
| 152 | self.emitter.emit(LDA(Absolute(dest_label))) | |
| 153 | self.emitter.emit(ADC(Immediate(Byte(src.low_byte())))) | |
| 154 | self.emitter.emit(STA(Absolute(dest_label))) | |
| 155 | self.emitter.emit(LDA(Absolute(Offset(dest_label, 1)))) | |
| 156 | self.emitter.emit(ADC(Immediate(Byte(src.high_byte())))) | |
| 157 | self.emitter.emit(STA(Absolute(Offset(dest_label, 1)))) | |
| 158 | elif isinstance(src, LocationRef): | |
| 159 | src_label = self.labels[src.name] | |
| 160 | dest_label = self.labels[dest.name] | |
| 161 | self.emitter.emit(LDA(Absolute(dest_label))) | |
| 162 | self.emitter.emit(ADC(Absolute(src_label))) | |
| 163 | self.emitter.emit(STA(Absolute(dest_label))) | |
| 164 | self.emitter.emit(LDA(Absolute(Offset(dest_label, 1)))) | |
| 165 | self.emitter.emit(ADC(Absolute(Offset(src_label, 1)))) | |
| 166 | self.emitter.emit(STA(Absolute(Offset(dest_label, 1)))) | |
| 167 | else: | |
| 168 | raise UnsupportedOpcodeError(instr) | |
| 157 | 169 | else: |
| 158 | 170 | raise UnsupportedOpcodeError(instr) |
| 159 | 171 | elif opcode == 'sub': |
| 408 | 408 | | { |
| 409 | 409 | | st off, c |
| 410 | 410 | | add score, 1999 |
| 411 | | } | |
| 412 | ? ForbiddenWriteError: a in main | |
| 413 | ||
| 414 | You can `add` a word memory location to another word memory location. | |
| 415 | ||
| 416 | | word score | |
| 417 | | word delta | |
| 418 | | routine main | |
| 419 | | inputs score, delta | |
| 420 | | outputs score | |
| 421 | | trashes a, c, z, v, n | |
| 422 | | { | |
| 423 | | st off, c | |
| 424 | | add score, delta | |
| 425 | | } | |
| 426 | = ok | |
| 427 | ||
| 428 | `add`ing a word memory location to a word memory location trashes `a`. | |
| 429 | ||
| 430 | | word score | |
| 431 | | word delta | |
| 432 | | routine main | |
| 433 | | inputs score, delta | |
| 434 | | outputs score | |
| 435 | | trashes c, z, v, n | |
| 436 | | { | |
| 437 | | st off, c | |
| 438 | | add score, delta | |
| 411 | 439 | | } |
| 412 | 440 | ? ForbiddenWriteError: a in main |
| 413 | 441 |
| 343 | 343 | |
| 344 | 344 | ### word operations |
| 345 | 345 | |
| 346 | Adding a constant word to a memory location. | |
| 346 | Adding a constant word to a word memory location. | |
| 347 | 347 | |
| 348 | 348 | | word score |
| 349 | 349 | | routine main |
| 350 | | inputs a, score | |
| 350 | | inputs score | |
| 351 | 351 | | outputs score |
| 352 | 352 | | trashes a, c, z, v, n |
| 353 | 353 | | { |
| 355 | 355 | | add score, 1999 |
| 356 | 356 | | } |
| 357 | 357 | = 00c018ad12c069cf8d12c0ad13c069078d13c060 |
| 358 | ||
| 359 | Adding a word memory location to another word memory location. | |
| 360 | ||
| 361 | | word score | |
| 362 | | word delta | |
| 363 | | routine main | |
| 364 | | inputs score, delta | |
| 365 | | outputs score | |
| 366 | | trashes a, c, z, v, n | |
| 367 | | { | |
| 368 | | st off, c | |
| 369 | | add score, delta | |
| 370 | | } | |
| 371 | = 00c018ad14c06d16c08d14c0ad15c06d17c08d15c060 | |
| 358 | 372 | |
| 359 | 373 | ### Buffers and Pointers |
| 360 | 374 | |