Assembler Language Reference

mtspr (Move to Special-Purpose Register) Instruction

Purpose

Copies the contents of a general-purpose register into a special-purpose register.

Syntax

Note: The special-purpose register is a split field.

See Extended Mnemonics of Moving from or to Special-Purpose Registers for more information.

Description

The mtspr instruction copies the contents of the source general-purpose register RS into the target special-purpose register SPR.

The special-purpose register identifier SPR can have any of the values specified in the following table. The order of the two 5-bit halves of the SPR number is reversed.

1. Moving to the DEC register is privileged in the PowerPC architecture and in the POWER family architecture. However, moving from the DEC register is privileged only in the PowerPC architecture.
2. 2Supported only in the POWER family architecture.

If the SPR field contains any value other than those listed in the SPR Values table, the instruction form is invalid.

The mtspr instruction has one syntax form and does not affect the Fixed-Point Exception Register or Condition Register Field 0.

Parameters

Examples

The following code copies the contents of GPR 5 into the Link Register:

# Assume GPR 5 holds 0x1000 00FF.
mtspr 8,5
# The Link Register now holds 0x1000 00FF.

Related Information

Fixed-Point Processor .

Fixed-Point Move to or from Special-Purpose Registers Instructions .