Performance Options

-fast

-fast

The -fast option selects a combination of optimization options for optimum execution speed and reasonable build times. This option is equivalent to +Ofast. Currently chosen options are:

You can override any of the options in -fast by specifying a subsequent option after it.

Use this option when porting C++ and C applications compiled on other UNIX operating systems to HP-UX.

	NOTE: Do not use this option for programs that depend on IEEE standard floating-point denormalized numbers. Otherwise, different numerical results may occur.

+Ofast

+Ofast

The +Ofast option selects a combination of optimization options for optimum execution speed for reasonable build times. Currently chosen options are:

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

+Ofaster

The +Ofaster option is equivalent to +Ofast with an increased optimization level. If used with +Oprofile=use, the optimization level will be +O4. Otherwise it will be +O3. The definition of +Ofaster may change or it may be deprecated in future releases.

+[no]srcpos

+[no]srcpos

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

+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.