mr

Move Register

mr RA, RS

Copies contents of RS to RA. (Alias for 'or RA, RS, RS').

Encoding

Binary Layout

31

0:5

RS

6:10

RA

11:15

RS

16:20

444

21:30

/

31

 

Format X-form

Opcode 0x7C000378

Extension Base

Operands

• RA
  Target
• RS
  Source

Example

mr r4, r3

Related

More in Base

Reference

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

Description

Move Register. Extended mnemonic for OR (or RA,RS,RS). Copies the contents of register RS into register RA.

Operation

RA ← RS

Programming Note

The `mr` instruction is commonly used to copy values between general-purpose registers. It does not require any special alignment or privilege level. However, be cautious when using this instruction in performance-critical sections as it may introduce pipeline stalls if the destination register is already in use.