modud

Modulo Unsigned Doubleword

modud RT, RA, RB

Calculates remainder of unsigned doubleword division.

Encoding

Binary Layout

31

0:5

RT

6:10

RA

11:15

RB

16:20

265

21:30

/

31

 

Format X-form

Opcode 0x7C000212

Extension Base

Operands

• RT
  Target
• RA
  Dividend
• RB
  Divisor

Example

modud r3, r4, r5

Related

More in Base

Reference

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

Description

Calculates the unsigned remainder (modulo) of a 64-bit doubleword division, storing the result in RT. The dividend is in RA and the divisor is in RB. No status flags are affected; division by zero is not trapped and produces undefined results.

Operation

RT ← (RA mod RB)

Programming Note

The modud instruction is used for performing an unsigned doubleword modulo operation. Ensure that the divisor in register RB is not zero to avoid undefined behavior. The result is placed in register RT, and this instruction operates at user privilege level.