[Bug target/111078] csneg is not used for (cset) * 2 - 1

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111078

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot 
gnu.org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-11-18

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
MIne
For f0 we should be able to match:
(set (reg:SI 98)
    (plus:SI (ashift:SI (eq:SI (reg:CC 66 cc)
                (const_int 0 [0]))
            (const_int 1 [0x1]))
        (const_int -1 [0xffffffffffffffff])))

here. Note -1 is important.

for f1 we should be able to match:
(set (reg:SI 98)
    (ior:SI (neg:SI (ne:SI (reg:CC 66 cc)
                (const_int 0 [0])))
        (const_int 1 [0x1])))

Though I wonder for gimple if we should conconalization to one form or another
...