https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114518
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Component|testsuite |rtl-optimization
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The reason why late_combine1 does not do it is because we have:
failed to match this instruction:
(set (reg:SI 123 [ _2 ])
(and:SI (ashiftrt:SI (reg:SI 125 [ xD.3519 ])
(const_int 14 [0xe]))
(const_int 6 [0x6])))
BUT combine is able to change the ashiftrt into lshiftrt and that matches.
I am not sure where we should put that transformation or should the target have
a matching pattern for the above and make sure the const value of the and does
NOT have the sign bit set.
