User's Guide

• +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.

+O[no]tls_calls_change_tp

The +O[no]tls_calls_change_tp option specifies whether or not function calls can change the value

of the thread pointer(tp), resulting in less aggressive optimizations to TLS variables which are

accessed by name.

+[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 any of the values below.

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.

itanium

Tune for the Itanium® processor.

itanium2

Tune for the Itanium2® processor.

mckinley

See itanium2® .

montecito

Tune for the Montecito® processor.

poulson

Tune for the Poulson® processor.

native Tune for the processor on which the compiler is running.

Performance Options 69