[Bug target/41868] cell microcode instruction (addic.) is generated for a trivial loop with -O2 optimizations, hurting performance badly

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41868

Segher Boessenkool <segher at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |segher at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |segher at gcc dot gnu.org

--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
We no longer generate addic. for this testcase, but that is an accident
(combine first makes dec+cmp into an addic., but then also combines it
with the conditional branch into a bdnz pattern; this needs splitting
later, and since r218591 we no longer split to addic.).

*add<mode>3_imm_{dot,dot2} should have rs6000_gen_cell_microcode in
the condition.  Mine.