dst

Data Stream Touch

dst RA, RB, STRM

Initiates a hardware data stream prefetch (AltiVec Legacy).

Encoding

Binary Layout

31

0:5

STRM

6:10

RA

11:15

RB

16:20

342

21:30

/

31

 

Format X-form

Opcode 0x7C0002AC

Extension Base

Operands

• RA
  Base
• RB
  Index
• STRM
  Stream ID

Example

dst r4, r5, 0

Related

More in Base

Reference

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

Description

Initiates a hardware prefetch stream for data that is likely to be loaded in the near future. The instruction computes an effective address from RA and RB and hints to the memory subsystem to begin streaming data into the cache with the temporal locality specified by STRM. This is an advisory instruction with no architectural side effects if the hardware does not support data streaming.

Operation

EA ← (RA | 0) + RB; InitiateDataStream(EA, STRM, isStore=0, isTransient=0)