Loop Interchange

• Untuned

real*8 a(2,40,2000)

do i=1, 2000

do j=1, 40

do k=1, 2

a(k,j,i) = a(k,j,i)*1.01

enddo

enddo

enddo

• Tuned

real*8 a(2000,40,2)

do i=1, 2

do j=1, 40

do k=1, 2000

a(k,j,i) = a(k,j,i)*1.01

enddo

enddo

enddo

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