[Bug tree-optimization/15596] [6/7/8 Regression] Missed optimization with bitfields with return value

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15596

--- Comment #29 from Segher Boessenkool <segher at gcc dot gnu.org> ---
We currently generate

fun:
        lwz 8,0(3)
        rlwimi 8,4,12,0,31-12
        rlwinm 10,8,24,24,31
        stw 8,0(3)
        rlwinm 10,10,0,30,27
        ori 10,10,0x8
        stb 10,2(3)
        ori 2,2,0
        lwz 10,0(3)
        rlwimi 10,5,9,22,22
        stw 10,0(3)
        blr

which is probably the worst it has been :-/