Begin using static in the demo game.
Chris Pressey
3 years ago
| 8 | 8 |
as `ld a, [ptr] + y` and `st a, [ptr] + y`.
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* Implements the "union rule for trashes" when analyzing `if` blocks.
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* Even if we `goto` another routine, we can't trash an output.
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11 |
* `static` storage locations local to routines can now be defined within routines.
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* Fixed bug where `trash` was not marking the location as being virtually altered.
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0.11
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Range-checking buffers might be too difficult. Range checking tables will be easier.
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If a value is ANDed with 15, its range must be 0-15, etc.
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### Routine-local static memory locations
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These would not need to appear in the inputs/outputs/trashes sets of the routines
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that call this routine.
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These might be forced to specify an initial value so that they can always be
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assumed to be meaningful.
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### Re-order routines and optimize tail-calls to fallthroughs
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Not because it saves 3 bytes, but because it's a neat trick. Doing it optimally
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outputs button_down, dispatch_game_state,
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actor_pos, actor_delta, actor_logic,
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screen, screen1, screen2, screen3, screen4, colormap1, colormap2, colormap3, colormap4
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trashes a, x, y, c, z, n, v, pos, new_pos, delta, ptr, save_x, compare_target, dispatch_logic
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trashes a, x, y, c, z, n, v, pos, new_pos, delta, ptr, compare_target, dispatch_logic
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game_state_routine
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//
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byte button_down : 0 // effectively static-local to check_button
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byte table[32] press_fire_msg: "PRESS`FIRE`TO`PLAY"
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byte save_x
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word compare_target
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//
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}
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define game_state_play game_state_routine
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411 |
static byte save_x : 0
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{
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ld x, 0
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repeat {
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