HP aC++/HP C A.06.25 Programmer's Guide

NOTE: This option is deprecated and may not be supported in future releases. Instead

you can use +Ofastoption.

+O[no]conservative

The +O[no]conservative option is deprecated and may not be used in future

releases. It is approximately equivalent to +Oparmsoverlap +Onomoveflops.

The default is +Onoconservative.

+O[no]limit

The +Olimit option enables optimizations that significantly increase compile time or

that consume a lot of memory.

The +Onolimit option suppresses optimizations regardless of their effect on compile

time or memory consumption.

Use +Onolimit at all optimization levels.

Usage:

+O[no]limit=level

The defined values of level are:

default

Based on tuning heuristics, the optimizer will spend a reasonable amount

of time processing large procedures. This is the default option.

min

For large procedures, the optimizer will avoid non-linear time

optimizations. This option is a synonym for +Olimit.

none

The optimizer will fully optimize large procedures, possibly resulting in

significantly increased compile time. This option is a synonym for

+Onolimit.

Example:

To remove optimization time restrictions at O2, O3, or O4 optimization levels, use

+Onolimit as follows:

aCC <opt level> +Onolimit sourcefile.C

+O[no]ptrs_ansi

The default is +Onoptrs_ansi.

+Optrs_ansi is synonymous to +Otype_safety=ansi.

+Onoptrs_ansi is synonymous to +Otype_safety=off.

74 Command-Line Options