https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109907
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For cset_32bit30_not with some patches which I will be posting, I get:
bst r25,6 ; 23 [c=4 l=3] *extzv/4
clr r24
bld r24,0
ldi r25,lo8(1) ; 24 [c=4 l=1] movqi_insn/1
eor r24,r25 ; 25 [c=4 l=1] *xorqi3
/* epilogue start */
ret ; 28 [c=0 l=1] return
Which is better than what was there before.
The way I get this is to use BIT_FIELD_REF inside fold_single_bit_test .
The first one I suspect load_extend_op for SImode returning SIGN_EXTEND for
avr.
