A More Parallel Solution

• Exploit the associativity of addition ...

  • Number processors 0 to n/2-1
  • Processor Pi adds x2P+1 and x2(P+1) ...

s1,2

s3,4

s5,6

s7,8

s1-4

s5-8

s1-8

P0

P1

P2

P3

P0 does

log n + 1

additions

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