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Module 2: x86 Architecture, CPU Control, I/O, Memory System Design

20142m

What is the use of condition code register?

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Condition Code Register (CCR) / Flag Register Uses:

CCR holds flags N, Z, V, C set by ALU after arithmetic/logic operation:

  • N (Negative): N=1 if result MSB=1 (negative in 2's complement). Used for signed branch (BMI/BPL).
  • Z (Zero): Z=1 if result = 0. Used to test equality (BEQ/BNE) and loop termination.
  • V (Overflow): V=1 if signed 2's complement overflow (result exceeds range). Used for signed arithmetic error detection.
  • C (Carry): C=1 if carry out from MSB (unsigned overflow) or borrow. Used for multi-precision addition/subtraction (ADC/SBC), unsigned comparison (BCS/BCC).

Uses: Conditional branching, decision making (CMP + flags), interrupt control, and detecting arithmetic errors without extra comparator.

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