Start optimizing fm.c. - Githubissues

nukeykt / Nuked-MD

Cycle accurate Mega Drive emulator

GNU General Public License v2.0

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Start optimizing fm.c. #14

Closed ghost closed 1 year ago

ghost commented 1 year ago

Unrolled loops that included unnecessary arithmetic.
Cleaned up functions that could be simplified.
Use lookup tables over multiple branches.
Start using const on variables that are read-only.

There is quite a bit more to be done within fm. This however is a good direction to start going at attempts to optimize the instructions generated, to use faster instructions and to reduce branching operations occurring within fm.c.

nukeykt commented 1 year ago

thanks

nukeykt commented 1 year ago

@movrsi fm is clearly broken after this PR https://www.youtube.com/watch?v=4YeT8u8eR9s so I pulled out your changes from main branch