Are we seeing the full benefits of LTO (link-time optimization) in CFU Playground?

[tcal-x]

With the picolibc integration in LiteX, link-time optimization is possible. But I'm not sure if we are seeing the benefits in all of the software that we compile into our monolithic executable, which includes not just LiteX libraries but also the TFLM library as well as our own code (menus etc.). Performance-wise, the TFLM libraries would be key.

@kgugala , I think you reported a 20% boost from initially enabling picolibc; but as we have seen elsewhere (#324), simply changing the code layout can increase/decrease performance by +/-20% or more, so it may be difficult to analyze.

[mithro]

I wouldn't expect much change in performance -- I would expect much more significant impact on the firmware size.