Assembler Language Reference

mtcrf (Move to Condition Register Fields) Instruction

Purpose

Copies the contents of a general-purpose register into the condition register under control of a field mask.

Syntax

Bits	Value
0-5	31
6-10	RS
11	/
12-19	FXM
20	/
21-30	144
31	Rc

mtcrf

FXM, RS

See Extended Mnemonics of Condition Register Logical Instructions for more information.

Description

The mtcrf instruction copies the contents of source general-purpose register (GPR) RS into the condition register under the control of field mask FXM.

Field mask FXM is defined as follows:

Bit	Description
12	CR 00-03 is updated with the contents of GPR RS 00-03.
13	CR 04-07 is updated with the contents of GPR RS 04-07.
14	CR 08-11 is updated with the contents of GPR RS 08-11.
15	CR 12-15 is updated with the contents of GPR RS 12-15.
16	CR 16-19 is updated with the contents of GPR RS 16-19.
17	CR 20-23 is updated with the contents of GPR RS 20-23.
18	CR 24-27 is updated with the contents of GPR RS 24-27.
19	CR 28-31 is updated with the contents of GPR RS 28-31.

The mtcrf instruction has one syntax form and does not affect the Fixed-Point Exception Register.

The preferred form of the mtcrf instruction has only one bit set in the FXM field.

Parameters

FXM	Specifies field mask.
RS	Specifies source general-purpose register for operation.

Examples

The following code copies bits 00-03 of GPR 5 into Condition Register Field 0:

# Assume GPR 5 contains 0x7542 FFEE.
# Use the mask for Condition Register
# Field 0 (0x80 = b'1000 0000').
mtcrf 0x80,5
# Condition Register Field 0 now contains b'0111'.

Related Information

Fixed-Point Processor .

Branch Processor .

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