HP aC++/HP C Programmer's Guide (B3901-90036; A.06.26; September 2011)

NOTE: The optimizer tries to determine the most likely target of indirect calls. If the

profile data is incomplete or ambiguous, the optimizer may not select the best target. If

this happens, your code’s performance may decrease.

This option can be used at optimization levels 3 and 4. At +O3, it is only effective if

indirect calls from functions within a file are mostly to target functions within the same

file. This is because +O3 optimizes only within a file, whereas +O4 optimizes across files.

The default is +Opromote_indirect_calls at optimization level 3 and above.

+Onopromote_indirect_calls will be the default at optimization level 2 and below.

+Orarely_called

+Orarely_called=function1[,function2...]

The +Orarely_called option overrides any information in a profile database.

The named functions are assumed to be rarely called

+Orarely_called:filename

The file indicated by filename contains a list of functions, separated by spaces or newlines.

These functions are assumed to be rarely called. This option overrides any information

in a profile database.

+O[no]signedpointers

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

The +Osignedpointers option treats pointers in Boolean comparisons (for example,

<, <=, >, >=) as signed quantities. Applications that allocate shared memory and that

compare a pointer to shared memory with a pointer to private memory may run incorrectly

if this optimization is enabled.

The default is +Onosignedpointers.

NOTE: This option is supported in C-mode only. A warning is displayed in C++ when

this option is used.

+Oshortdata

+Oshortdata[=size]

All objects of [size] bytes or smaller are placed in the short data area, and references

to such data assume it resides in the short data area. Valid values of size are a decimal

number between 8 and 4,194,304 (4MB).

If no size is specified, all data is placed in the short data area. The default is

+Oshortdata=8.

76 Command-Line Options