[Bug c++/78249] New: In consistent results for 0.0 * inf when optimizer is enabled

[joshua.england at worldprogramming dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78249

            Bug ID: 78249
           Summary: In consistent results for 0.0 * inf when optimizer is
                    enabled
           Product: gcc
           Version: 6.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joshua.england at worldprogramming dot com
  Target Milestone: ---

Created attachment 39988
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39988&action=edit
Code and make file to show the bug

The following code gives -NAN when not optimized and NAN when optimized (note
the change in sign).

double x = 0.0 * std::numeric_limits<double>::infinity();

The attachment contains FORTRAN code as the project I am working on requires
linking to FORTRAN code. I discovered the problem because of inconsistent
results between the output from GFORTRAN and G++ give similar code.