Chapter 3.4, Problem 3.1PP

Program Plan Intro

Operand Specifiers:

• The instructions may have more than one operands.
  • It specifies source values to perform an operation.
  • It also contains destination location into which result is to be placed.
• The different types of operands provided could be classified into three types:
  • Immediate:
    • It is used for constant values.
    • It is written as “$” followed by integer.
    • The range of immediate values may differ based on instruction.
  • Register:
    • It denotes the contents of a register.
    • The 8-byte, 4-byte, 2-byte or 1-byte register’s low-order portions denote 64, 32, 16 or 8 bite respectively.
    • The notation “r_a” denotes arbitrary register “a” and its value is indicated with reference “R[r_a]”.
    • It views register set as an array R that is indexed by register identifiers.
  • Memory:
    • The “effective address” is used to access some memory location.
    • The notation “M_b[Addr]” denotes reference to b-byte value stored in memory starting at address “Addr”.