mfvsrld

Move From VSR Lower Doubleword

mfvsrld RA, XS

Moves the lower doubleword of a vector register to a general-purpose register.

Encoding

Binary Layout

31

0:5

XS

6:10

RA

11:15

0

16:20

307

21:31

 

Format XX1-form

Opcode 0x7C000266

Extension VSX

Operands

• RA
  Target GPR
• XS
  Source VSR
• RT
  Target General Purpose Register
• VSRL
  Source Vector Register Lower Doubleword

Example

mfvsrld r4, vs1

Related

More in VSX

Reference

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

Description

Moves the lower doubleword of a VSR to a general-purpose register. This is a VSX instruction that does not affect condition registers or status fields.

Operation

RA ← XS[64:127]

Programming Note

Use mfvsrld to transfer data from a vector register's lower doubleword into a general-purpose register. Ensure that the VSR index (determined by SX and S fields) is correctly specified to avoid unintended data access. This instruction operates at user privilege level but will raise an exception if executed in supervisor mode with invalid register indices.