fl32 vs df in cvf6.6 - comp.lang.fortran

Message from discussion fl32 vs df in cvf6.6

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More options May 15 2008, 10:47 am

Newsgroups: comp.lang.fortran

From: formulae translator <liwei19742...@gmail.com>

Date: Thu, 15 May 2008 07:47:36 -0700 (PDT)

Local: Thurs, May 15 2008 10:47 am

Subject: fl32 vs df in cvf6.6

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Today I tried a very simple speed test using fl32 and df command
(compaq visual fortran 6.6)

program speed
integer :: i, j, k, n
real :: a, b, c
call cpu_time(a)
do i=1,1000
do j=1,100
do k=1,100
c=(sin(real(i))**2.0+cos(real(j))**2.0)+log(real(i))*log(real(j))
+real(k)
! write(*,*) c
end do
end do
end do
call cpu_time(b)
b=b-a
write(*,*) b,c
end program

the output of df compiled speed.exe is 0.000000e+00 133.2387
while the output of fl32 compiled speed.exe is 4.203125 133.238703

I am just curious why df compiled exe always gives zero cpu time?

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