[Bug target/77353] [AVR] uint16_t instead uint8_t comparison

[bseifert at gmx dot at]

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!