[Bug rtl-optimization/66552] Missed optimization when shift amount is result of signed modulus

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66552

--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Trunk does (both -m32 and -m64)

        srawi 9,4,5
        addze 9,9
        slwi 9,9,5
        subf 4,9,4
        srw 3,3,4

and

        rlwinm 4,4,0,27,31
        srw 3,3,4

so the original problem is still there.