[Bug fortran/87960] New: [9 Regression] Miscompilation of 527.cam4_r benchmark from SPEC2017 w/ -O2 since r265946

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87960

            Bug ID: 87960
           Summary: [9 Regression] Miscompilation of 527.cam4_r benchmark
                    from SPEC2017 w/ -O2 since r265946
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jvdelisle at gcc dot gnu.org
  Target Milestone: ---

I see:

Error with '/home/marxin/Programming/cpu2017/bin/specinvoke -d
/home/marxin/Programming/cpu2017/benchspec/CPU/527.cam4_r/run/run_peak_refrate_gcc7-m64.0000
-f compare.cmd -E -e compare.err -o compare.stdout'; no non-empty output files
exist
  Command returned exit code 1
*** Miscompare of cam4_validate.txt; for details see
   
/home/marxin/Programming/cpu2017/benchspec/CPU/527.cam4_r/run/run_peak_refrate_gcc7-m64.0000/cam4_validate.txt.mis

$ cat
/home/marxin/Programming/cpu2017/benchspec/CPU/527.cam4_r/run/run_peak_refrate_gcc7-m64.0000/cam4_validate.txt.mis
0001:   PASS:  4  points. 
       allow_std=0
       ^
'cam4_validate.txt' long