On Jan 26, 2012, at 2:10 PM, Georg-Johann Lay wrote: > I tested the code with avr-gcc 4.5 and command line options -Os -mmcu=atmega8 > > With the attributes, the object size is 54 bytes. > Without the attributes the object size is 64 bytes.
4.5.3 ? Whatever this issue is, it apparently snuck in between 4.5.2 and 4.5.3.
(reports are that 4.5.2 produced smaller code than 4.3.2)
Sorry for forgetting the commandline/etc in my report. I am using -Os, and
compiling for m328p
I get:
billw@VB-Ubuntu$ avr-gcc -ggdb -Os -c -mmcu=atmega328p -mshort-calls foo.c
billw@VB-Ubuntu$ avr-size foo.o
text data bss dec hex filename
64 0 0 64 40 foo.o
billw@VB-Ubuntu$ avr-gcc -ggdb -Os -c -mmcu=atmega328p -mshort-calls -DNAKED
foo.c
billw@VB-Ubuntu$ avr-size foo.o
text data bss dec hex filename
58 0 0 58 3a foo.o
and more substantial diffs, including the following. "naked" deletes the
prolog, but adds instructions in the body...
-.LM7:
+.LSM6:
ldi r24,lo8(5)
- rjmp .L8
+ rcall putch
+ rjmp .L4
.L3:
-.LM8:
+.LSM7:
cpi r24,lo8(-127)
brne .L5
-.LM9:
+.LSM8:
ldi r24,lo8(4)
- rjmp .L8
+ rcall putch
+ rjmp .L4
.L5:
-.LM10:
+.LSM9:
ldi r24,lo8(3)
foo.c
Description: Binary data
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