xor

XOR

xor RA, RS, RB

Performs a bitwise Exclusive OR comparison.

Encoding

Binary Layout

31

0:5

RS

6:10

RA

11:15

RB

16:20

316

21:30

Rc

31

 

Format X-form

Opcode 0x7C000278

Extension Base

Operands

• RA
  Target Register
• RS
  Source Register 1
• RB
  Source Register 2

Example

xor r3, r4, r5

// r3 = r4 ^ r5

Registers Altered

CR0

Related

More in Base

Reference

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

Description

Perform a bitwise XOR of RS and RB, storing the result in RA. If Rc=1, CR0 is updated with the comparison flags based on the result. This is a Base category logical instruction.

Operation

RA ← RS ⊕ RB
if Rc = 1 then
  CR0 ← (RA = 0) || LT || GT || SO

Programming Note

When Rc=1 (dot form), CR0 is updated with the signed comparison of the result against zero (LT, GT, EQ) and the current SO bit from XER.