[avr-gcc-list] optimizer

[Bernard Fouché]

Hi.

I'm compiling with -Os for atmega64 with avr-gcc 3.4.2. When I have

uint32_t var;

var=(uint32_t)function_returning_an_int8_t();

the generated code is, for instance:

 var=(uint32_t)eeprom_read_byte((uint8_t *)EEPROM_PARM);
ldi     r24, 0x36       ; 54
ldi     r25, 0x00       ; 0
call    0xf9c0
eor     r25, r25
eor     r26, r26
eor     r27, r27
sts     0x046B, r24
sts     0x046C, r25
sts     0x046D, r26
sts     0x046E, r27

Could it be instead:
ldi     r24, 0x36       ; 54
ldi     r25, 0x00       ; 0
call    0xf9c0
sts     0x046B, r24
sts     0x046C, r1
sts     0x046D, r1
sts     0x046E, r1

That would spare 6 bytes...

  Bernard