dssall
Data Stream Stop All
dssall
Stops all active data stream prefetch operations.
Encoding
Binary Layout
31
0:5
0
6:10
0
11:15
0
16:20
822
21:30
/
31
Operands
Related
More in Base
Reference
View in PowerISA v3.1C Specification ↗
OPF Power ISA v3.1C
Description
Stops all active data stream prefetch operations initiated by DSS instructions. This is a privileged instruction that terminates data prefetching without affecting general processor state or condition registers. Used to optimize cache behavior by halting speculative data stream operations.
Operation
All data stream prefetch operations are terminated.Programming Note
Use dssall to halt all data stream operations, preventing any further processing or transfer of data. This instruction is typically used in scenarios where you need to ensure complete cessation of data flow, such as during system shutdowns or critical error handling. Ensure that this instruction is executed at a privilege level sufficient to control data streams, and be aware that it may trigger exceptions if not properly managed.