https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115084
--- Comment #2 from Kamil Kaznowski <kamkaz at windowslive dot com> --- (In reply to Andrew Pinski from comment #1) > There is another bug dealing with division and truncation that was just > filed. It is a generic (non-avr) issue. I assume you mentioned this bug here: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115036 It is not quite the same, since here we are dealing with literals. In case of literals, it is an existing optimization. #include <stdint.h> uint16_t functino(uint16_t num) { return (7500ULL) / num; } This snippet, even compiled with `avr-gcc -O0`, will use __udivmodhi4, 16-bit routine. It seems that 24-bit routines are simply not considered, unless the operands are specifically typed __(u)int24.
