[Bug target/107827] switch table compression could shrink large tables (but missing), testcase cerf-lib

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107827

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
          Component|c                           |target
             Target|                            |x86_64-*-*
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-11-22

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
x86_64 target does not dojump table compression at all.
But aarch64 and arm targets do:
.L4:
        .2byte  (.L103 - .Lrtx4) / 4
        .2byte  (.L102 - .Lrtx4) / 4
        .2byte  (.L101 - .Lrtx4) / 4
        .2byte  (.L100 - .Lrtx4) / 4
        .2byte  (.L99 - .Lrtx4) / 4
        .2byte  (.L98 - .Lrtx4) / 4
        .2byte  (.L97 - .Lrtx4) / 4
        .2byte  (.L96 - .Lrtx4) / 4
        .2byte  (.L95 - .Lrtx4) / 4


Confirmed. Note the /4 can't be done for x86 but the rest I think can be done.
The /4 can't be done because some instructions one byte in length on x86_64.