March 2004
Intermediate to advanced
560 pages
14h 38m
English
Content preview from HP-UX 11i Tuning and Performance
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11.2. Optimization Levels
Table 11-1 shows the basic optimization levels that are included in many compilers and indicates how they are invoked:.
| Level | Description | Command Line Option | C Directive | Fortran Directive |
|---|---|---|---|---|
| 0 | Very little optimization. | PA-RISC: the default, so no flag needed IPF: +O0 | #pragma opt_level 0 #pragma optimize off | $Optimize off |
| 1 | Local optimization within block boundaries only. | PA-RISC: +O1 IPF: the default, so no flag needed | #pragma opt_level 1 | $Optimize level 1 on |
| 2 | Global optimization within procedures only. | -O or +O2 | #pragma opt_level 2 | $Optimize level 2 on |
| 3 | Full optimization across all procedures within a single file. | +O3 | #pragma opt_level 3 | $Optimize level 3 on |
| 4 | Full optimization across the entire application ... |
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