比较'.eq。'的速度。在fortran中整数实数和逻辑之间的命令

Question

直觉上，我认为要比较两个值，速度应该是逻辑＆gt;整数＆gt;真，所以我做了这个测试程序：

program t
logical :: a=.true.
real :: b=1.021341
integer :: c=1

real(kind=16) :: start, finish,test

call cpu_time(start)
test=0.0
do while (test<1000000.)
 if (a.eqv.a) then
  test=test+0.01
 endif
enddo
call cpu_time(finish)
print '("Time for compare logical= ",f6.3," seconds.")',finish-start

call cpu_time(start)
test=0.0
do while (test<1000000.)
 if (b.eq.b) then
  test=test+0.01
 endif
enddo
call cpu_time(finish)
print '("Time for compare real= ",f6.3," seconds.")',finish-start

call cpu_time(start)
test=0.0
do while (test<1000000.)
 if (c.eq.c) then
  test=test+0.01
 endif
enddo
call cpu_time(finish)
print '("Time for compare integer= ",f6.3," seconds.")',finish-start
end program

但输出是

Time for compare logical=  2.228 seconds.
Time for compare real=  2.200 seconds.
Time for compare integer=  2.200 seconds.

看起来他们没有显着差异。为什么我认为逻辑应该是最快的。我使用gfortran 5.4.0。我的操作系统是ubuntu 16.04。