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Table 4-3 “HP C Optimization Parameters ” summarizes the
HP C optimization parameters: Table 4-3 HP C Optimization Parameters Option | What It Does | Level of Opt |
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+O[no]aggressive | The +O[no]aggressive
option enables optimizations that can result in significant performance
improvement, but that can change a program"s behavior.
These optimizations include newly released optimizations and the
optimizations invoked by the following advanced optimization options:
[1]
The
default is +Onoaggressive. | 2, 3, 4 | +O[no]all | The +Oall
option performs maximum optimization, including aggressive optimizations
and optimizations that can significantly increase compile time and
memory usage. The default is +Onoall. | 4 | +O[no]conservative | The +O[no]conservative
option causes the optimizer to make conservative assumptions about
the code when optimizing it. Use +Oconservative
when conservative assumptions are necessary due to the coding style,
as with non-standard conforming programs. The +Oconservative
option relaxes the optimizer"s assumptions about the target
program. The default is +Onoconservative. | 2, 3, 4 | +O[no]info | +Oinfo
displays informational messages about the optimization process.
This option supports the core optimization levels, and therefore,
can be used at levels 0-4. The default is +Onoinfo. | 0, 1, 2, 3, 4 | +O[no]limit | The +Olimit
option suppresses optimizations that significantly increase compile-time
or that can consume a lot of memory. The +Onolimit
option allows optimizations to be performed regardless of their
effect on compile-time or memory usage. The default is +Olimit. | 2, 3, 4 | +O[no]size | The +Osize
option suppresses optimizations that significantly increase code
size. The +Onosize
option does not prevent optimizations that can increase code size.
The default is +Onosize. | 2, 3, 4 |
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