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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/100855] pow run time gfortran vs ifort
Date: Tue, 01 Jun 2021 16:19:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100855

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4
   Last reconfirmed|                            |2021-06-01
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |WAITING
                 CC|                            |kargl at gcc dot gnu.org

--- Comment #1 from kargl at gcc dot gnu.org ---
This is not a gfortran bug.  Adding code to use exp() and log(),
I compiled the modified code:

         s0 =3D s0 + i**(0.05 + n)
         s1 =3D s1 + exp(0.05 + n)
         s2 =3D s2 + log(0.05 + n)

with the -fdump-tree-optimized option.  Looking at the dumped info,
one finds the three lines=20

  _107 =3D __builtin_powf (_103, _106);
  _109 =3D __builtin_expf (_105);
  _111 =3D __builtin_logf (_105);

If I compile the code with "-S -O3" and look at the assembly code
I see

        call    powf
        call    expf
        call    logf

which are math functions contained in your system's libm.  So, this
is an issue with your libm not gfortran.  I'll let someone else judge
whether the bug should be closed with INVALID or WONTFIX.=