mtfsfi (Move to FPSCR Field Immediate) Instruction

Purpose

Copies an immediate value into a specified Floating-Point Status and Control Register field.

Syntax

Description

The mtfsfi instruction copies the immediate value specified by the I parameter into the Floating-Point Status and Control Register field specified by BF. None of the other fields of the Floating-Point Status and Control Register are affected.

The mtfsfi instruction has two syntax forms. Each syntax form has a different effect on Condition Register Field 1.

The two syntax forms of the mtfsfi instruction never affect the Floating-Point Status and Control Register fields. If the syntax form sets the Record (Rc) bit to 1, the instruction affects the Floating-Point Exception (FX), Floating-Point Enabled Exception (FEX), Floating Invalid Operation Exception (VX), and Floating-Point Overflow Exception (OX) bits in Condition Register Field 1.

Note: When specifying FPSCR 0-3, some bits cannot be explicitly set or reset.

Parameters

Examples

1. The following code sets Floating-Point Status and Control Register Field 6 to b'0100':

   mtfsfi 6,4
   # Floating-Point Status and Control Register Field 6
   # is now b'0100'.

2. The following code sets Floating-Point Status and Control Register field 0 to b'0100' and sets Condition Register Field 1 to reflect the result of the operation:

   mtfsfi. 0,1
   # Floating-Point Status and Control Register Field 0
   # is now b'0001'.
   # Condition Register Field 1 now contains 0x1.

Related Information

Floating-Point Processor.

Interpreting the Contents of a Floating-Point Register.