Power ISA™ Version 2.03 - Power.org

Version 2.03
3.2.2.1 Obsolete Data Cache Instructions
[Category: Vector.Phased-Out]
The Data Stream Touch (dst), Data Stream Touch for
Store (dstst), and Data Stream Stop (dss) instructions
(primary opcode 31, extended opcodes 342, 374, and
822 respectively), which were proposed for addition to
the Power ISA and were implemented by some processors,
may be treated as no-ops (rather than as illegal
instructions).
The treatment of these instructions (no-op or illegal
instruction) is independent of whether other Vector
instructions are available (i.e., is independent of the
contents of MSR VEC (see Book III-S) or MSR SPV
(see Book III-E).
Programming Note
These instructions merely provided hints, and thus
were permitted to be treated as no-ops even on
processors that implemented them.
The treatment of these instructions is independent
of whether other Vector instructions are available
because, on processors that implemented the
instructions, the instructions were available even
when other Vector instructions were not.
The extended mnemonics for these instructions
were dstt, dststt, and dssall.
Chapter 3. Storage Control Instructions
361