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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - return type for isnan instrinsic math function causes problem in conditional"
href="https://bugs.llvm.org/show_bug.cgi?id=47425">47425</a>
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<th>Summary</th>
<td>return type for isnan instrinsic math function causes problem in conditional
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<th>Product</th>
<td>flang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Frontend
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>naromero@anl.gov
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<th>CC</th>
<td>David.Truby@arm.com, jperier@nvidia.com, kirankumartp@gmail.com, llvm-bugs@lists.llvm.org, sscalpone@nvidia.com
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<pre>Created <span class=""><a href="attachment.cgi?id=23930" name="attach_23930" title="conditional on return value is isnan">attachment 23930</a> <a href="attachment.cgi?id=23930&action=edit" title="conditional on return value is isnan">[details]</a></span>
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@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'
^^^^^^^^^^</pre>
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