Been wanting to do this for a long time.
This does impose performance issues when building with the vanilla
release profile, as cargo does not perform optimizations across crate
boundary (we care mostly about inlining).
so I added release-lto profile
Also fixed some broken stuff I found across the project, meh
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Of course only arm-wrestler caught it while mgba suite/eggvance did not :(
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Instead of using a struct member to hold the last barrel shifter carry output, which is expansive as it needs to be saved/loaded from memory, I now pass the carry around as an INOUT parameter.
Using perf anotate really shows high perctile of samples being spent on reading/writing `self.bs_carry_out`
Since this is a rather "surgical" changeset, I have made sure to run it against eggvance test suite, mGBA test suite and some games as well.
I actually saw better improvements than what the benchmark measured, but 7% is decent enough :)
```
run_60_frames time: [180.18 ms 180.45 ms 180.77 ms]
change: [-7.2464% -6.9081% -6.6324%] (p = 0.00 < 0.05)
Performance has improved.
```
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Fulfill TODO from long ago, I used perf-record (--call-graph dwarf) and detected that add_cycles() was hot enough,
I added 2 optimizations:
- Removed bound checks from array accesses
- Increase the LUT size to include dummy entries for open-bus to eliminate the if check
run_60_frames time: [183.65 ms 183.69 ms 183.73 ms]
change: [-9.4414% -9.2849% -9.1315%] (p = 0.00 < 0.05)
Performance has improved.
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Also, clean up some of the cfg(debug) mess
benchmark report:
run_60_frames time: [110.61 ms 111.01 ms 111.42 ms]
change: [-7.1171% -6.5425% -5.9132%] (p = 0.00 < 0.05)
Performance has improved.
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* Convert gpu bitfield!() registers to unpacked form, and defer pack/unpack to bus read/write operations
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run_60_frames time: [158.26 ms 160.84 ms 163.03 ms]
change: [-24.960% -18.808% -12.975%] (p = 0.00 < 0.05)
Performance has improved.
Wasn't expecting such an improvment tbh, but who am I to argue with results
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It's quite an handy way to log messages from ROMs, so I thought it'd be nice to add it.
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Fixes#109Fixes#106
Fixes MegaMan email menu freezing and probably some more games
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Just directly impl Bus trait for Box<[u8]>
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