i must be one of 1, 2, or 3.
Table A–45 The -xprefecth_level Values
Value |
Meaning |
---|---|
1 |
Enables automatic generation of prefetch instructions. |
2 |
Targets additional loops, beyond those targeted at -xprefetch_level=1, for prefetch insertion. Additional prefetches may be inserted beyond those that were inserted at -xprefetch_level=1. |
3 |
Targets additional loops, beyond those targeted at -xprefetch_level=2, for prefetch insertion. Additional prefetches may be inserted beyond those that were inserted at -xprefetch_level=2. |
The default is -xprefetch_level=1 when you specify -xprefetch=auto.
This option is effective only when it is compiled with -xprefetch=auto, with optimization level 3 or greater (-xO3), and on a platform that supports prefetch (v9, v9a, v9b, generic64, native64).