csci 2510 tutorial 1 basic assembly and data representation
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CSCI 2510 Tutorial 1 Basic Assembly and Data Representation. ZONG Wen Department of Computer Science and Engineering The Chinese University of Hong Kong [email protected]. Main topic:. 1. Write an assembly program with given instruction 2. Two’s complement operation - PowerPoint PPT PresentationTRANSCRIPT
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CSCI 2510 Tutorial 1Basic Assembly and Data Representation
ZONG Wen
Department of Computer Science and EngineeringThe Chinese University of Hong Kong
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Main topic:
1. Write an assembly program with given instruction
2. Two’s complement operation
3. Ordering of bytes in data
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Write a machine program with given instruction
Basic component of a computer
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Write a machine program with given instruction
There are only 6 machine instructions on a single-accumulator processor, namely: Load [Memory] {to ACC} e.g. Load [2872]Store [Memory] {from ACC} e.g. Store [1536]Add Constant {to ACC} e.g. Add -95Add [Memory] {to ACC} e.g. Add [2132]Multiply Constant {to ACC} e.g. Multiply 23Multiply [Memory]{to ACC} e.g. Multiply [298]
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Write a machine program with given instruction
Variable x and y are stored in address 1000 and 1004, try to implement x2 + y2, store the result in 1008.
Load [1000]; load data to registerMultiply [1000]; perform memory + register operationStore [1008]; store temporary result to memoryLoad[1004]; Multiply[1004];Add[1008];Store[1008]; store result
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Operation on two’s complement
Example: (–6) + 8 * 3 – 1 Step 1 11111010 + (00001000 * 00000011) – 00000001Step 2 (11111010 + 00011000) – 00000001Step 3 00010010 – 00000001Step 4 00010001Step 5 17 (decimal answer without overflow)
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Operation on two’s complement
Example: (–6) + 8 * 3 – 1 Step 1 11111010 + (00001000 * 00000011) – 00000001Step 2 (11111010 + 00011000) – 00000001Step 3 00010010 – 00000001Step 4 00010001Step 5 17 (decimal answer without overflow)
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Big endian and little endian
In big endian, you store the most significant byte in the smallest address
In little endian, you store the least significant byte in the smallest address
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Big endian and little endian
For a data of 4 bytes: 90AB12CD
Big endian:
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Big endian and little endian
For a data of 4 bytes: 90AB12CD
Little endian:
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Float point representation
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Q&A