mulli

Multiply Low Immediate

mulli RT,RA,SI

Multiplies the contents of a register by an immediate value and places the low-order 32 bits of the product into another register.

Encoding

Binary Layout

0

0:5

RT

6:10

RA

11:15

SI

16:31

 

Format D-form

Opcode 0x1C000000

Extension Base

Operands

• RT
  Target General Purpose Register
• RA
  Source General Purpose Register
• SI
  16-bit Immediate Value

Example

mulli r3, r4, 16

Related

More in Base

Reference

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

Description

The 64-bit first operand is (RA). The 64-bit second operand is the sign-extended value of the SI field. The low-order 32 bits of the 128-bit product of the operands are placed into register RT.

Operation

prod0:127 ← (RA) × EXTS(SI)
RT ← prod64:127

Programming Note

For mulli and mullw, the low-order 32 bits of the product are the correct 32-bit product for 32-bit mode.