mtfsb1

Move To FPSCR Bit 1

mtfsb1 BT

Sets a specific bit in the FPSCR.

Details

Sets (sets to 1) the FPSCR bit specified by BT. The FPSCR bits are numbered 0–31. Setting certain FPSCR bits (e.g., rounding mode or enable flags) can alter the behavior of subsequent floating-point operations.

Pseudocode Operation

FPSCR[BT] ← 1

Programming Note

This instruction is used to enable a specific floating-point exception. Ensure that the FPSCR register is properly managed to avoid unintended exceptions. This operation requires supervisor privilege level.

Example

mtfsb1 0

Encoding

Binary Layout
63
0
BT
6
/
11
/
16
38
21
/
31
 
Format X-form
Opcode 0xFC00004C
Extension Floating-Point
Registers Altered FPSCR

Operands

  • BT
    Bit Index