Computer Systems: Program... -Access
3rd Edition
ISBN: 9780134071923
Author: Bryant
Publisher: PEARSON
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Chapter 4.5, Problem 4.37PP
Program Plan Intro
Data movement instructions:
- The different instructions are been grouped as “instruction classes”.
- The instructions in a class performs same operation but with different sizes of operand.
- The “Mov” class denotes data movement instructions that copy data from a source location to a destination.
- The class has 4 instructions that includes:
- movb:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 1 byte data size.
- movw:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 2 bytes data size.
- movl:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 4 bytes data size.
- movq:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 8 bytes data size.
- movb:
Unary and Binary Operations:
- The details of unary operations includes:
- The single operand functions as both source as well as destination.
- It can either be a memory location or a register.
- The instruction “incq” causes 8 byte element on stack top to be incremented.
- The instruction “decq” causes 8 byte element on stack top to be decremented.
- The details of binary operations includes:
- The first operand denotes the source.
- The second operand works as both source as well as destination.
- The first operand can either be an immediate value, memory location or register.
- The second operand can either be a register or a memory location.
Jump Instruction:
- The “jump” instruction causes execution to switch to an entirely new position in program.
- The “label” indicates jump destinations in assembly code.
- The “je” instruction denotes “jump if equal” or “jump if zero”.
- The comparison operation is performed.
- If result of comparison is either equal or zero, then jump operation takes place.
- The “ja” instruction denotes “jump if above”.
- The comparison operation is performed.
- If result of comparison is greater, then jump operation takes place.
- The “pop” instruction resumes execution of jump instruction.
- The “jmpq” instruction jumps to given address. It denotes a direct jump.
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Computer Systems: Program... -Access
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