Program Size. Investigate ways of reducing MIDICtrl size.

[jmamma]

Currently MCL is using:

Sketch uses 203550 bytes (80%) of program storage space. Maximum is 253952 bytes.

Might want to start thinking of ways to cut this down.

A lot of the low level code is inlined. All the SYSEX Encoder/Decoder is inlined. Not sure what the space saving will be vs performance hit.

A general rule I've been following is to inline in ISR.

[jmamma]

Unused glyphs from the Adafruit-GFX-Library should be culled.

[yatli]

Current situation:

[yatli]

g=global
l=local
F=function
O=progmem

[yatli]

So, functions are absolute heavy hitters. After the previous rounds of optimization, now the PROGMEM is only a small fraction.

[yatli]

Tried a few tricks.

The ones that I thought would be very effective, but actually made things worse:

• NO_INLINE some big routines
• Fold some repeated logic by hand

The ones that I thought wouldn't matter but very effective:

• int -> uint8_t

[yatli]

Setting up a new branch for size optimization.

[yatli]

#108

[yatli]

To wrap up this thread:

• Two attempts are made in 2020, bringing down sketch size to 78% (#108, #125)
• As of 2021, with features are being added, it creeps back to 90% and keeps growing
• #161 introduces compression to squeeze the last drops out of the mega2560