| --- Log opened Sat Mar 09 00:00:59 2019 |
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| 07:54 | <&McMartin> | Officially kicking off the new project. https://bumbershootsoft.wordpress.com/2019/03/09/mandala-checkers-initialization-and-display/ |
| 08:17 | <~Vorntastic> | Fancy |
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| 08:30 | <&McMartin> | Also kind of fun, but not a sin and thus not enumerated |
| 08:31 | <&McMartin> | Since it's always more efficient on Z80 and 6502 to have your asm loops counting down instead of up, the column markers have to subtract their index from the character code for "INVERSE I" while the row markers can just add INVERSE 0 to the loop index. |
| 08:34 | <&McMartin> | And yeah, it's fancy-looking enough even with the ZX81's shitty semigraphics that I feel like it would be properly respectful to complete the implementation there before shifting to a machine with 24 to 32x the RAM |
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| 08:46 | <~Vorntastic> | Why is it more efficient to count down? |
| 08:53 | <&McMartin> | Because the decrement instructions alter the zero flag, which means you don't need an extra compare operation. |
| 08:53 | <&McMartin> | For the Z80 in particular, if the B register is your loop register, there's a single instrution that is "decrement B register and branch to label if it is not zero" |
| 08:54 | <&McMartin> | So that is very nice indeed |
| 08:54 | <&McMartin> | That said |
| 08:54 | <&McMartin> | The Z80's 16-bit decrement instructions do *not* alter the zero flag and this is inconvenient for me more often than it is a lifesaver, but when you need it to be transparent you *really* need it, so... |
| 08:55 | <&McMartin> | I think the expectation is that the 16-bit increment/decrement ops are for bumping pointers around |
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| 11:38 | <@gnolam> | https://twitter.com/patchfriday/status/1103921729741586433?s=21 |
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| 19:51 | <&McMartin> | gnolam: legit |
| 19:51 | <&McMartin> | So run it in a VM with OpenJDK~ |
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| 23:21 | | * McMartin optimizes his printing routines, shrinks the entire program size by over 5% |
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| --- Log closed Sun Mar 10 00:00:00 2019 |