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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/100855] pow run time gfortran vs ifort
Date: Sat, 05 Jun 2021 11:59:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100855

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|WAITING                     |RESOLVED

--- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
I don't know if the test is coming from a real world problem. The modified =
test

program power
    implicit none

    real :: sum, sum1, n, q
    integer :: i, j
    integer :: limit
    real :: start, finish

    sum =3D 0d0
    sum1 =3D 0d0
    limit =3D 10000
    n =3D 2.0
    q =3D 0.5
    call CPU_TIME(start)
        do i=3D1, limit
            n =3D n*q
            sum1 =3D sum1 + (i ** (0.05 + n))
        end do
        do i=3D1, limit
            sum =3D sum + (i ** 0.05)
        end do
        sum =3D sum1 + (limit-1)*sum
    call CPU_TIME(finish)
    print *, sum, n, sum1
    print '("Time =3D ",f6.3," seconds.")',finish-start
end program power

yields

   150945680.       0.00000000       15095.7852=20=20=20=20
Time =3D  0.000 seconds.=