© 2009 IBM Corporation 19-20 July, 2009 | PADTAD 2009 @ Chicago, Illinois 16 Scenario of Proposed Algorism to Save Automatic Operations program sample implicit none integer i, n parameter(n=10000000) real*8 a, b, pi, fourpi, x(n), sin, s, t1, t2, t3, rtc a = 0 b = 0 pi = 3.14159265d0 s = rtc() fourpi = pi * 4.0d0 do i = 1, n x(i) = i * sin(i / fourpi) enddo t1 = rtc() - s s = rtc() do i = 1, n a = a + 1.0d0 / x(i) enddo t2 = rtc() - s s = rtc() do i = 2, n b = b + ((x(i) + a) / fourpi + 1.0d0) enddo t3 = rtc() - s write(*,*) a= , a, b= , b write(*,*) time= , t1, t2, t3 end Algorithm for saving operation history program sample implicit none integer i, n parameter(n=10000000) real*8 a, b, pi, fourpi, x(n), sin, s, t1, t2, t3, rtc a = 0 b = 0 pi = 3.14159265d0 s = rtc() fourpi = pi * 4.0d0 do i = 1, n x(i) = i * sin(i / fourpi) enddo t1 = rtc() - s s = rtc() do i = 1, n a = a + 1.0d0 / x(i) enddo t2 = rtc() - s s = rtc() $BEGIN do i = 2, n b = b + ((x(i) + a) / fourpi + 1.0d0) enddo $END t3 = rtc() - s write(*,*) a= , a, b= , b write(*,*) time= , t1, t2, t3 end pseudo change file Step 1: Generate pseudo change file by inserting special lines to specify range for the automatic operation.