COMPUTER SYSTEMS&MOD MSGT/ET SA AC PKG
COMPUTER SYSTEMS&MOD MSGT/ET SA AC PKG
3rd Edition
ISBN: 9780134671123
Author: Bryant
Publisher: PEARSON
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Chapter 4.1, Problem 4.7PP
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.

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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