------- Comment #4 from hutchinsonandy at gcc dot gnu dot org 2009-12-31 03:16
-------
The same occurs in 4.5
I think the bug is invalid
The expression 1<< pin will be promoted. This produces a defined result if
pin>7 and <15
The expression can not then be lower to 8 bit shift - since a shift by >7 is
undefined.
If you use pin &7, the shift is indeed 8 bit shift. Though it still loads a int
(HIMODE) value of 1 that should have been reduced to QIMODE.
setpinx:
/* prologue: function */
/* frame size = 0 */
/* stack size = 0 */
.L__stack_usage = 0
mov r25,r24
andi r25,lo8(7)
ldi r18,lo8(1)
ldi r19,hi8(1)
mov r24,r18
rjmp 2f
1: lsl r24
2: dec r25
brpl 1b
cpi r22,lo8(1)
brne .L7
in r25,53-0x20
or r25,r24
out 53-0x20,r25
ret
.L7:
in r25,53-0x20
com r24
and r24,r25
out 53-0x20,r24
ret
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29560
