[Bug middle-end/66637] New: [6 Regression] 481.wrf in SPEC CPU 2006 is miscompiled

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66637

            Bug ID: 66637
           Summary: [6 Regression] 481.wrf in SPEC CPU 2006 is miscompiled
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

On Linux/x86-64, 481.wrf in SPEC CPU 2006 is compiled into an infinite
loop with

gfortran  -O3 -funroll-loops -ffast-math   -DSPEC_CPU_LINUX
-DSPEC_CPU_CASE_FLAG -DSPEC_CPU_LOGICAL_STRICT -frecord-marker=4 

r224506 is good and r224712 is bad.