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From: "yelinhui at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/105924] New: false floating point exception when
 evaluating exponential function
Date: Sat, 11 Jun 2022 07:20:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105924

            Bug ID: 105924
           Summary: false floating point exception when evaluating
                    exponential function
           Product: gcc
           Version: 7.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: yelinhui at hotmail dot com
  Target Milestone: ---

$ gfortran --version
GNU Fortran (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0
Copyright (C) 2017 Free Software Foundation, Inc.

$ cat test.f
      program test
      implicit none
      real*8 :: e
      e=3D-4.d2=20=20=20=20=20=20
      print *, e, exp(-e*e)
      end program test

$ gfortran -O0 -g -fbacktrace
-ffpe-trap=3Dzero,overflow,underflow,invalid,denormal test.f

$./a.out

Program received signal SIGFPE: Floating-point exception - erroneous arithm=
etic
operation.

Backtrace for this error:
#0  0x1554d03f82ed in ???
#1  0x1554d03f7503 in ???
#2  0x1554cfc8cf0f in ???
#3  0x1554d00c5ea4 in ???
#4  0x1554d004e1fe in ???
#5  0x55b38e68a9d5 in test
        at /tmp/test.f:7
#6  0x55b38e68aa54 in main
        at /tmp/test.f:9
Floating point exception (core dumped)=