crxor

Condition Register XOR

crxor BT, BA, BB

Performs a bitwise XOR between two bits in the Condition Register. Used to clear CR bits (crxor x,x,x).

Encoding

Binary Layout

19

0:5

BT

6:10

BA

11:15

BB

16:20

193

21:30

/

31

 

Format XL-form

Opcode 0x4C000182

Extension Base

Operands

• BT
  Target Bit
• BA
  Source Bit A
• BB
  Source Bit B

Example

crxor 0, 0, 0

// Clears CR bit 0 (sets it to 0).

Registers Altered

CR

Related

More in Base

Reference

View in PowerISA v3.1C Specification ↗ OPF Power ISA v3.1C

Description

Performs a bitwise XOR of CR bit BA and CR bit BB, storing the result in CR bit BT. When BA and BB are the same bit, this effectively clears CR[BT]; this form is frequently used for clearing condition register fields.

Operation

CR[BT] ← CR[BA] ^ CR[BB]

Programming Note

The crxor instruction is used to perform a bitwise XOR operation between two condition register bits and store the result in another condition register bit. Ensure that the BA, BB, and BT fields are correctly set to avoid unintended behavior. This instruction operates at the problem state privilege level.