[Bug target/88856] New: [8/9 Regression] gfortran producing wrong code with -funroll-loops

[doko at debian dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88856

            Bug ID: 88856
           Summary: [8/9 Regression] gfortran producing wrong code with
                    -funroll-loops
           Product: gcc
           Version: 8.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at debian dot org
  Target Milestone: ---

seen when build scipy on s390x with the current GCC 8 branch.  According to the
Debian report [1] this is tracked down to miscompilation of one Fortran file
with -funroll-loops. The Ubuntu report [2] has a "standalone" python test case.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=915738
[2] https://bugs.launchpad.net/ubuntu/+source/python-scipy/+bug/1811798