Performance and program size disadvantages of Arduino on AVR and reducing them using LLVM
summary
Implements a custom LLVM pass that resolves Arduino digitalWrite/digitalRead pin-number math into direct AVR port writes at compile time, using Clang/LLVM for AVR but linking with AVR‑GCC because the AVR backend is experimental; repository contains an Arduino hardware folder configured for Clang and the optimization pass. Benchmarks use a blink test and show frequency rising from ~144 kHz -> ~2 MHz. Notes disabled LTO, removed interrupt-table use of function-pointer arrays, and reports I/O and size win.
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chapters (9)
- 0:00Introduction
- 0:43What is Arduino
- 1:50Advantages
- 3:10Disadvantages
- 4:04Why use LLVM
- 5:15Limitations
- 5:55Optimization
- 6:43Testing
- 7:32Other opportunities
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