https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77353
--- Comment #1 from Berni <bseifert at gmx dot at> --- another example: if (PINA < PINC) { PORTB = 0; } compiles to: 6c2: 20 b1 in r18, 0x00 ; 0 6c4: 86 b1 in r24, 0x06 ; 6 6c6: 30 e0 ldi r19, 0x00 ; 0 6c8: 90 e0 ldi r25, 0x00 ; 0 6ca: 28 17 cp r18, r24 6cc: 39 07 cpc r19, r25 6ce: 0c f4 brge .+2 ; 0x6d2 <main+0x10> 6d0: 15 b8 out 0x05, r1 ; 5 two 8 bit registers are compared as uint16_t!