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

itanium
Tune for the Itanium® processor.
itanium2
Tune for the Itanium2® processor.
native
Tune for the processor on which the compiler is running.
Porting Options
Use the following options as necessary when porting your code from other operating
environments to HP-UX.
-fast
-fast
The -fast option selects a combination of optimization options for optimum execution
speed and reasonable build times. Currently chosen options are:
• +O2
• +Olibcalls
• +Ofltacc=relaxed
• +Onolimit
• +DSnative
• +FPD
You can override any of the options in -fast by specifying a subsequent option after
it. This option is equivalent to +Ofast.
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.
+sb
+sb
The +sb option specifies unqualified char, short, int,long, and long long bitfields
as signed. The default is +sb.
NOTE: When both +sb and +uc are in effect, +uc will override this for char bit
fields.
+ub
+ub
Porting Options 93