mulchw

Multiply Cross Halfword

mulchw RT, RA, RB

Multiply bottom half of RA by top half of RB.

Encoding

Binary Layout

4

0:5

RT

6:10

RA

11:15

RB

16:20

168

21:30

0

31

 

Format XO-form

Opcode 0x10000150

Extension Embedded

Operands

• RT
  Target
• RA
  Src A
• RB
  Src B

Example

mulchw r3, r4, r5

Related

More in Embedded

Reference

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

Description

Multiplies the sign-extended bottom halfword of RA by the sign-extended top halfword of RB, storing the low 32 bits of the product in RT. This is a signed 16×16→32 multiply operation. No condition register or status flags are affected.

Operation

a ← EXTS(RA[16:31])
b ← EXTS(RB[0:15])
RT ← (a × b)[32:63]