HP aC++/HP C A.06.20 Programmer's Guide

The +Ofast option selects a combination of optimization options for optimum execution

speed for reasonable build times. Currently chosen options are:

• +O2

• +Ofltacc=relaxed

• +Onolimit

• +DSnative

• +FPD

• -Wl,+pi,1M

• -Wl,+pd,1M

• -Wl,+mergeseg

This option is a synonym for -fast.

NOTE: Do not use this option for programs that depend on IEEE standard floating

point denormalized numbers. Otherwise, different numerical results may occur. See

+Ofltacc=relaxed.

+Ofaster

The +Ofaster option is equivalent to +Ofast with an increased optimization level.

The definition of +Ofaster may change, or the option may be deprecated in future

releases.

+[no]srcpos

The +[no]srcpos option controls the generation of source position information for

HP Caliper. The default is +srcpos.

When +srcpos, is in effect, the compiler generates source position information. When

+nosrcpos is in effect, the compiler does not generate this information and the compiler

instructs the linker to discard any of this information found in the object files.

+DSmodel

The +DSmodel option performs instruction scheduling for a particular implementation

of the Itanium®-based architecture. The default is blended.

model can be either of the following four values.

blended

Tune to run reasonably well on multiple implementations. As old

implementation become less important and new implementations are

added, the behavior with this value will change accordingly.

92 Command-Line Options