[llvm-bugs] [Bug 47425] New: return type for isnan instrinsic math function causes problem in conditional

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47425

            Bug ID: 47425
           Summary: return type for isnan instrinsic math function causes
                    problem in conditional
           Product: flang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedbugs at nondot.org
          Reporter: naromero at anl.gov
                CC: David.Truby at arm.com, jperier at nvidia.com,
                    kirankumartp at gmail.com, llvm-bugs at lists.llvm.org,
                    sscalpone at nvidia.com

Created attachment 23930
  --> https://bugs.llvm.org/attachment.cgi?id=23930&action=edit
conditional on return value is isnan

Assuming isnan is a standard Fortran intrinsic math function, this short
program fails to compile with Flang. It compiles successfully with PGI, ifort,
and gfortran.

[naromero at naromero-desktop bugs]$
/nfs/gce/projects/naromero-workspace/llvm-master/bin/flang -c testisnan.F
testisnan.F:6:11: error: Must have LOGICAL type, but is INTEGER(4)
        if (isnan(dum)) write (*,*) 'dum is NaN'
            ^^^^^^^^^^

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