https://gcc.gnu.org/bugzilla/show_bug.cgi?id=18065
Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2005-05-01 04:18:52 |2024-7-18
Summary|usual arithmetic conversion |usual arithmetic conversion
|not applying correctly |are sub-optimal
--- Comment #40 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Still an issue on the current trunk with test case:
typedef __INT8_TYPE__ int8_t;
int8_t divmod_ss (int8_t s)
{
return (int8_t) -3 % s;
}
compiles to
divmod_ss:
mov r22,r24 ; 26 [c=12 l=3] *extendqihi2/1
lsl r24
sbc r23,r23
ldi r24,lo8(-3) ; 27 [c=4 l=2] *movhi/4
ldi r25,lo8(-1)
call __divmodhi4 ; 28 [c=0 l=2] *divmodhi4_call
/* epilogue start */
ret ; 31 [c=0 l=1] return
$ avr-gcc div.c -S -Os -dp
