mtvsrd

Move To VSR Doubleword

mtvsrd XT, RA

Moves 64 bits from a GPR to a VSR.

Encoding

Binary Layout

31

0:5

XT

6:10

RA

11:15

0

16:20

179

21:31

 

Format XX1-form

Opcode 0x7C000166

Extension VSX

Operands

• XT
  Target VSR
• RA
  Source GPR

Example

mtvsrd vs1, r4

Registers Altered

MSR

Related

More in VSX

Reference

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

Description

Moves a 64-bit value from general-purpose register RA into the left-most doubleword element of VSX register XT. The entire 64-bit content of RA is copied to bits 0-63 of the target VSX register; the right doubleword element (bits 64-127) is left undefined. This VSX extension instruction does not affect condition registers.

Operation

XT[0:63] ← RA
XT[64:127] ← undefined

Programming Note

The mtvsrd instruction is commonly used to transfer data from a general-purpose register to the first doubleword of a vector-scalar register. Ensure that the appropriate privilege level (FP or VEC) is enabled in the MSR register, otherwise, an exception will be raised. Note that the second doubleword of the VSR is zeroed out during this operation.