maclhw

Multiply Accumulate Low Halfword

maclhw RT, RA, RB

Multiply bottom half of RA by bottom half of RB, add to RT.

Encoding

Binary Layout

4

0:5

RT

6:10

RA

11:15

RB

16:20

428

21:30

0

31

 

Format XO-form

Opcode 0x10000358

Extension Embedded

Operands

• RT
  Acc/Dest
• RA
  Src A
• RB
  Src B

Example

maclhw r3, r4, r5

Related

More in Embedded

Reference

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

Description

Multiplies the low halfword (bits 16-31) of RA by the low halfword of RB as signed integers, then adds the 32-bit product to RT and stores the result in RT. This is part of the Embedded (SPE) category and does not affect any condition or status registers.

Operation

product ← EXTS(RA[16:31]) × EXTS(RB[16:31])
RT ← RT + product