DAXPY Example: Schedules

• Simple schedule: unrolled by 2:

• 2fp/(8cycles*2fp/cy)=1/8 peak 4fp/(9cycles*2fp/cy)=2/9 peak

• R12000@300MHz ~ 75 Mflop/s ~133 Mflop/s

DO I=1,n

Y(I) = Y(I) + A*X(I)

ENDDO

DO I=1,n-1,2

Y(I+0) = Y(I+0) + A*X(I+0)

Y(I+1) = Y(I+1) + A*X(I+1)

ENDDO

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