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141 lines
2.8 KiB
141 lines
2.8 KiB
! program to time the various routines
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subroutine f_main
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use ddmodule
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implicit none
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integer*4 old_cw
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double precision t
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double precision second
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double precision time_thresh
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parameter (time_thresh = 0.5d0)
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type (dd_real) a, b, c, d
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integer n, i, k
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call f_fpu_fix_start (old_cw)
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write (6, *) 'Timing addition / subtraction ...'
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n = 512
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do k = 1, 25
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n = n * 2
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a = ddpi()
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b = sqrt(a)
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c = sqrt(b)
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d = sqrt(c)
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t = second()
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do i = 1, n
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a = b + c
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b = a - d
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a = b + c
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b = a - d
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enddo
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t = second() - t
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if (t .ge. time_thresh) exit
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enddo
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n = n * 4
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write (6, *) n, ' operations in ', t, ' seconds.'
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write (6, *) t/n*1.0d6, ' usec'
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call ddwrite(6, a)
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write (6, *) 'Timing multiplication ...'
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n = 512
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do k = 1, 25
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n = n * 2
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a = 1.0d0 + ddpi() * 1.0d-7
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b = a + 1.0d-7
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c = b + 1.0d-8
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d = c + 1.0d-9
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t = second()
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do i = 1, n
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a = b * c
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b = a * d
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a = b * c
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b = a * d
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enddo
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t = second() - t
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if (t .ge. time_thresh) exit
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enddo
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n = n * 4
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write (6, *) n, ' operations in ', t, ' seconds.'
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write (6, *) t/n*1.0d6, ' usec'
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call ddwrite(6, a)
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write (6, *) 'Timing division ...'
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n = 512
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do k = 1, 25
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n = n * 2
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a = 1.0d0 + ddpi()
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b = 2.0d0 + ddpi()
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c = 1.0d0 + 1.0d-8
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d = 1.0d0 + 1.0d-9
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t = second()
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do i = 1, n
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a = b / c
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b = a / d
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a = b / c
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b = a / d
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enddo
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t = second() - t
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if (t .ge. time_thresh) exit
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enddo
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n = n * 4
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write (6, *) n, ' operations in ', t, ' seconds.'
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write (6, *) t/n*1.0d6, ' usec'
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call ddwrite(6, a)
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write (6, *) 'Timing square root ...'
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n = 512
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do k = 1, 25
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n = n * 2
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a = 0.0d0
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b = 2.0d0 + ddpi()
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t = second()
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do i = 1, n
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a = sqrt(a + b)
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enddo
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t = second() - t
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if (t .ge. time_thresh) exit
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enddo
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write (6, *) n, ' operations in ', t, ' seconds.'
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write (6, *) t/n*1.0d6, ' usec'
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call ddwrite(6, a)
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write (6, *) 'Timing sin ...'
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n = 512
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do k = 1, 25
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n = n * 2
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a = 0.0d0
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c = 1.7d0 * ddreal(1.0d0) / dble(n)
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d = 2.45d0 * ddpi() / dble(n + 3)
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t = second()
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do i = 1, n
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a = a + sin(c)
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c = c + d
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enddo
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t = second() - t
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if (t .ge. time_thresh) exit
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enddo
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write (6, *) n, ' operations in ', t, ' seconds.'
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write (6, *) t/n*1.0d6, ' usec'
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call ddwrite(6, a)
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write (6, *) 'Timing log ...'
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n = 512
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do k = 1, 25
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n = n * 2
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a = 0.0d0
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c = exp(ddreal(-50.1d0));
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d = exp(ddreal(100.2d0) / dble(n))
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t = second()
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do i = 1, n
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a = a + log(c)
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c = c * d
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enddo
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t = second() - t
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if (t .ge. time_thresh) exit
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enddo
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write (6, *) n, ' operations in ', t, ' seconds.'
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write (6, *) t/n*1.0d6, ' usec'
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call ddwrite(6, a)
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end
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