mirror of https://github.com/bsnes-emu/bsnes.git
2cc077e12b
I rewrote the S-SMP processor core (implementation of the 256 opcodes), utilizing my new 6502-like syntax. It matches what bass v05r01 uses. Took 10 hours. Due to being able to group the "mov reg,mem" opcodes together with "adc/sbc/ora/and/eor/cmp" sets, the total code size was reduced from 55.7KB to 42.5KB for identical accuracy and speed. I also dropped the trick I was using to pass register variables as template arguments, and instead just use a switch table to pass them as function arguments. Makes the table a lot easier to read. Passes all of my S-SMP tests, and all of blargg's arithmetic/cycle-timing S-SMP tests. Runs Zelda 3 great as well. Didn't test further. This does have the potential to cause some regressions if I've messed anything up, and none of the above tests caught it, so as always, testing would be appreciated. Anyway, yeah. By writing the actual processor with this new mnemonic set, it confirms the parallels I've made. My guess is that Sony really did clone the 6502, but was worried about legal implications or something and changed the mnemonics last-minute. (Note to self: need to re-enable snes.random before v085 official.) EDIT: oh yeah, I also commented out the ALSA snd_pcm_drain() inside term(). Without it, there is a tiny pop when the driver is re-initialized. But with it, the entire emulator would lock up for five whole seconds waiting on that call to complete. I'll take the pop any day over that. |
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| bsnes | ||
| snesfilter | ||
| snespurify | ||
| snesshader | ||