__transient_unlimited_protected_stream_depth

Purpose

Sets the prefetch depth prefetch_depth for the unlimited length protected load or store stream with identifier stream_id. The stream is likely to be transient, that is, the time interval during which the program accesses the unit is likely to be short.

Prototype

void __transient_unlimited_protected_stream_depth (unsigned int prefetch_depth, unsigned int stream_id);

Parameters

prefetch_depth
A relative, qualitative value which sets the steady-state fetch-ahead distance of the prefetches for a stream. The fetch-ahead distance is the number of lines being prefetched in advance of the line from which data is currently being loaded, or to which data is currently being stored. Valid values are as follows:
0
The default defined in the Data Stream Control Register.
1
None.
2
Shallowest.
3
Shallow.
4
Medium.
5
Deep.
6
Deeper.
7
Deepest.
stream_id
An integer with a value 0 to 11 on POWER7 processors.

Usage

Valid only when -qarch is set to target POWER7 processors.