Control the automatic generation of prefetch instructions.
This option is only effective when compiling with:
-xprefetch=auto,
with optimization level 3 or greater,
on a platform that supports prefetch.
The default for -xprefetch=auto without specifying -xprefetch_level is level 2.
Prefetch level 2 generates additional opportunities for prefetch instructions than level 1. Prefetch level 3 generates additional prefetch instructions than level 2.
Prefetch levels 2 and 3 may note be effective on older SPARC or x86 platforms.