The MIPS ISA implements CLZ: https://ti.tuwien.ac.at/cps/teaching/courses/cavo/files/MIPS32-IS.pdf For `tests/periph_gpio` this shaves off 20 bytes on `6lowpan-clicker`.
The MIPS ISA implements CLZ: https://ti.tuwien.ac.at/cps/teaching/courses/cavo/files/MIPS32-IS.pdf For `tests/periph_gpio` this shaves off 20 bytes on `6lowpan-clicker`.