5.14 Write a version of the inner product procedure described in Problem 5.13 that uses 6 x 1 loop unrolling. For x86-64, our measurements of the unrolled version give a CPE of 1.07 for integer data but still 3.01 for both floating-point data. A. Explain why any (scalar) version of an inner product procedure running on an Intel Core i7 Haswell processor cannot achieve a CPE less than 1.00. B. Explain why the performance for floating-point data did not improve with loop unrolling.

Computer Networking: A Top-Down Approach (7th Edition)
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5.14
Write a version of the inner product procedure described in Problem 5.13 that
uses 6 x 1 loop unrolling. For x86-64, our measurements of the unrolled version
give a CPE of 1.07 for integer data but still 3.01 for both floating-point data.
A. Explain why any (scalar) version of an inner product procedure running on
an Intel Core i7 Haswell processor cannot achieve a CPE less than 1.00.
B. Explain why the performance for floating-point data did not improve with
loop unrolling.
Transcribed Image Text:5.14 Write a version of the inner product procedure described in Problem 5.13 that uses 6 x 1 loop unrolling. For x86-64, our measurements of the unrolled version give a CPE of 1.07 for integer data but still 3.01 for both floating-point data. A. Explain why any (scalar) version of an inner product procedure running on an Intel Core i7 Haswell processor cannot achieve a CPE less than 1.00. B. Explain why the performance for floating-point data did not improve with loop unrolling.
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