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update docs for 32-bit intermediates

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Brooke Vibber 2024-12-31 14:16:43 -08:00
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todo.md
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@ -3,13 +3,11 @@ things to try:
* skip add on the top-byte multiply in sqr8/mul8
* should save a few cycles, suggestion by jamey
* perform the zx_next = zx^s + cx in 32-bit space, before rounding
* should improve precision on max zoom, might cost a few cycles
* patch the entire expanded-ram imul8xe on top of imul8 to avoid the 3-cycle thunk penalty :D
* try 3.13 fixed point instead of 4.12 for more precision
* can we get away without the extra bit?
* since exit compare space would be 6.26 i think so
* y-axis mirror optimization