https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118012
--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
(In reply to Georg-Johann Lay from comment #0)
> For comparison, here is the code when the test is for bit 1 instead of bit 0:
>
> if (b & 1)
^^^^^^^^^^
This should be "if (b & 2)"
> c ^= a;
>
> sbrs r20,1 ; 75 [c=4 l=2] *sbrx_branchhi
> rjmp .L3
> eor r24,r18 ; 73 [c=4 l=1] *xorqi3
> eor r25,r19 ; 74 [c=4 l=1] *xorqi3
