GCC for ARM is pretty great these days, although I can only vouch for it on Cortex-M. I think the code generation is on par with or better than IAR/Keil in most

GCC for ARM is pretty great these days, although I can only vouch for it on Cortex-M. I think the code generation is on par with or better than IAR/Keil in most cases, and it's much nicer to use Intellij/VSCode/etc instead of mucking around with dated vendor IDEs. https://developer.arm.com/open-source/gnu-toolchain/gnu-rm https://developer.arm.com/open-source/gnu-toolchain/gnu-rm