[Bug target/82447] [IVOPTS] Consider removing cmp instruction while iterating on an array of known bound

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82447

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-10-06
                 CC|                            |amker at gcc dot gnu.org
            Summary|Consider removing cmp       |[IVOPTS] Consider removing
                   |instruction while iterating |cmp instruction while
                   |on an array of known bound  |iterating on an array of
                   |                            |known bound
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think IVO knows to count from 128 down but not from -128 to 0 up so this
would need to be added (and hope that costing on the target is good enough to
prefer that variant).