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We’re writing a back-end for LLVM to generate code for the AVR family of microcontrollers found on Arduinos.

Itinerary

• Get it to build
• Get it to add
  • Write an LLVM input program, try to assemble it
  • Add register and instruction info until it doesn’t crash here (?)
• Get it to assemble
  • Write assembly printer
  • Iterate on printer until output assembles with avr-gcc
• Run it on real hardware

Useful docs

• Getting Started with LLVM
• Writing an LLVM Compiler Backend
• Atmel ATmega168 datasheet
• avr-libc calling convention