[Bug fortran/94841] [10 Regression]527.cam4_r 7.68% regression on Intel Cascadelaker with -O2, 9.57% regression with -Ofast -march=native -funroll-loops -flto

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94841

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |26163
   Last reconfirmed|                            |2020-04-29
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |WAITING
   Target Milestone|---                         |10.0
     Ever confirmed|0                           |1
          Component|target                      |fortran

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Probably the mentioned inefficiency but the fix was a correctness one.

Needs a testcase, fortran folks do not have access to SPEC and the question
is whether the inefficiency can be fixed for the problematical case(s).


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)