Hi again,
Andrew Haley schrieb:
For -O2 gcc 4.3 does:
;; Function test (test)
Analyzing Edge Insertions.
test ()
{
uint8_t ctr;
<bb 2>:
xx = 0;
xx = 1;
ctr = 2;
<L0>:;
xx = ctr;
ctr = ctr + 1;
if (ctr != 64) goto <L0>; else goto <L1>;
<L1>:;
return;
okay, i just tested 4.2-20070228 and voila - i can reproduce what you
have seen in 4.3, here is the assembler equivalent of this:
test:
/* prologue: frame size=0 */
/* prologue end (size=0) */
sts var,__zero_reg__
ldi r24,lo8(1)
sts var,r24
ldi r24,lo8(2)
.L2:
sts var,r24
subi r24,lo8(-(1))
cpi r24,lo8(64)
brne .L2
/* epilogue: frame size=0 */
ret
So the uint8_t versus unsigned int problem seems to be gone in 4.2. But
only for this special case, as in the function where i have seen the
"problem" yesterday, i see this "unsigned int" stuff again now and it
again compiles to a 16 bit counter. I'll try to find out what triggers
the problem this time.
...Michael
