CE-320-10

# CE-320-10 - Click to edit Master subtitle style Jaerock...

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Unformatted text preview: Click to edit Master subtitle style Jaerock Kwon Microcomputers I - Electrical and Computer Multiple-Precision Arithmetic Lecture 10 Microcomputers I - Electrical and Computer Jaerock Kwon Jaerock Kwon Microcomputers I - Electrical and Computer Goals of todays lecture Use multiple precision arithmetic to add and subtract large numbers. Practice writing programs in assembly. Microcomputers I - Electrical and Computer Jaerock Kwon Jaerock Kwon Microcomputers I - Electrical and Computer Precision? The term precision is often used to refer to the size of a unit of data manipulated by the processor. Single-precision refers to instructions that manipulate one byte at a time. ADDA, ADDB, ABA, SUBA, SUBB, SBA Double-precision refers to two-byte operation. ADDD, SUBD ABX: (B) + (X) X, ABY: (B) + (Y) & Y Microcomputers I - Electrical and Computer Jaerock Kwon Jaerock Kwon Microcomputers I - Electrical and Computer Multiple-Precision Adding and subtracting numbers longer than single precision introduce an issue . Carries and borrows need to propagate through a number. Microcomputers I - Electrical and Computer Jaerock Kwon Jaerock Kwon Microcomputers I - Electrical and Computer Example Adding two quadruple-precision numbers Multi-precision addition is performed one byte at a time, beginning with the least significant byte. 92 FF 45 B7 hex 6D 32 5D 88 hex Microcomputers I - Electrical and Computer ORG \$1200 num1 DC.B\$92, \$FF, \$45, \$B7 num2 DC.B\$6D, \$32, \$5D, \$88 ans DS.B4 ORG \$2000 LDAA...
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## This document was uploaded on 11/12/2009.

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CE-320-10 - Click to edit Master subtitle style Jaerock...

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