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The 80x86 does extended-precision multiplication in the same manner except that it works with bytes, words, and double words rather than digits. Figure 8-2 shows how this works. 1) Multiply the L.Oo. words. B 2) Multiply D * A. A B C D C D. D*B D A 3) Multiply C* B. 4) Multiply C* A. B D D*B D*A D*A C*B C * B C A 5) Compute sum of partial products. D D* B D*A C*B C*A AB * CB Figure 8-2: Extended-precision multiplication Probably the most important thing to remember when performing an extended-precision multiplication is that you must also perform a multiple- precision addition at the same time. Adding up all the partial products requires several additions that will produce the result. Listing 8-1 demonstrates the proper way to multiply two 64-bit values on a 32-bit processor.

The 80x86 does extended-precision multiplication in the same manner except that it works with bytes, words, and double words rather than digits. Figure 8-2 shows how this works. 1) Multiply the L.Oo. words. B 2) Multiply D * A. A B C D C D. D*B D A 3) Multiply C* B. 4) Multiply C* A. B D D*B D*A D*A C*B C * B C A 5) Compute sum of partial products. D D* B D*A C*B C*A AB * CB Figure 8-2: Extended-precision multiplication Probably the most important thing to remember when performing an extended-precision multiplication is that you must also perform a multiple- precision addition at the same time. Adding up all the partial products requires several additions that will produce the result. Listing 8-1 demonstrates the proper way to multiply two 64-bit values on a 32-bit processor.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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The 80x86 does extended-precision multiplication in the same manner except that it works with bytes, words, and double words rather than digits. Figure 8-2 shows how this works. 1) Multiply the L.O. words. 2) Multiply D * A. A C D D. D* B D* B D* A 3) Multiply C * B. 4) Multiply C * A. A A D* B D* B D*A C* B C * B CA 5) Compute sum of partial products. A В C D D*B D* A C* B C* A AB * CB Figure 8-2: Extended-precision multiplication Probably the most important thing to remember when performing an extended-precision multiplication is that you must also perform a multiple- precision addition at the same time. Adding up all the partial products requires several additions that will produce the result. Listing 8-1 demonstrates the proper way to multiply two 64-bit values on a 32-bit processor.
Transcribed Image Text:The 80x86 does extended-precision multiplication in the same manner except that it works with bytes, words, and double words rather than digits. Figure 8-2 shows how this works. 1) Multiply the L.O. words. 2) Multiply D * A. A C D D. D* B D* B D* A 3) Multiply C * B. 4) Multiply C * A. A A D* B D* B D*A C* B C * B CA 5) Compute sum of partial products. A В C D D*B D* A C* B C* A AB * CB Figure 8-2: Extended-precision multiplication Probably the most important thing to remember when performing an extended-precision multiplication is that you must also perform a multiple- precision addition at the same time. Adding up all the partial products requires several additions that will produce the result. Listing 8-1 demonstrates the proper way to multiply two 64-bit values on a 32-bit processor.
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