[Bug ipa/84658] [7/8 Regression] -O3 -fmerge-all-constants causes incorrect for-each loop generation.

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84658

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |6.4.1
           Keywords|                            |wrong-code
   Last reconfirmed|                            |2018-03-02
          Component|c++                         |ipa
                 CC|                            |marxin at gcc dot gnu.org
     Ever confirmed|0                           |1
            Summary|-O3 -fmerge-all-constants   |[7/8 Regression] -O3
                   |causes incorrect for-each   |-fmerge-all-constants
                   |loop generation.            |causes incorrect for-each
                   |                            |loop generation.
   Target Milestone|---                         |7.4

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  IPA ICF breaks this somehow, already visible with -O2 -fipa-icf.

Martin?