I have had some issues compiling source code with the latest gcc in svn.
The following program fails me:
#include <avr/io.h>
int main(void) {
DDRB |= _BV(DDB5);
}
avr-gcc -mmcu=at90usb1287 -c test.c -o test.o -O2
/tmp/ccqKOBv9.s: Assembler messages:
/tmp/ccqKOBv9.s:16: Error: number must be positive and less than 32
make: *** [all] Error 1
The assembly produced for main:
.global main
.type main, @function
main:
/* prologue: function */
/* frame size = 0 */
/* stack size = 0 */
.L__stack_usage = 0
sbi 36,5
ret
.size main, .-main
.ident "GCC: (GNU) 4.7.0 20111123 (experimental)"
The sbi instruction needs values 0-31, 36 is too high.
The instruction in avr.md which generates this is *sbi, only
enabled with optimizations. I think this is a new optimization
added, but 0x20 needs to be subtracted from the memory location.
In avr.md I changed:
return "sbi %i0,%2";
to
return "sbi %i0-0x20,%2";
It fixed the problem. I think this needs to be done all over the place
for sbi and cbi, as well as for in and out. There might be a better
way to more elegantly output the subtracted value so the assembler doesn't
need to do the subtraction. Does anyone know who made the changes?
I am using the latest version in svn.
Sean
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