Parallel Prefix, Ladner & Fischer [1980]

s1-4

s5-8

P0

P1

P2

P3

Pi receives sum

of items to its

left, fwds to left

s.t., adds sum of

left s.t, sends to

root of right s.t.

s1,2

s3,4

s5,6

s7,8

c1-2

c5-6

c1

c3

c5

c7

s1-8

c1-4

x1

x1-2

x1-3

x1-4

x1-5

x1-6

x1-7

x1-8

c--

c1-4

c--

c1-2

c1-4

c1-6

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