HP UX Fortran Software manual +Ofltacc=relaxed . This, Fast, +Onoinitcheck

Table 29 Fine-tuning optimization options (continued)

Level	Level	Function
		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. This
		option is a synonym for
		-fast.
+Ofaster	All	This option is equivalent to
		+Ofastwith an increased
		optimization level. The
		definition of +Ofastermay
		change or it may be
		deprecated in future
		releases.
+O[no]fltacc	+O2or higher	Disable [enable]
		floating-point optimizations
		that can result in numerical
		differences. By default, the
		optimizer does not perform
		such optimizations. For
		information about the effect
		this option can have on your
		program, see the HP-UX
		Floating-Point Guide.
+Ofrequently_called=function1[,function2...]	All	The named functions are
		assumed to be frequently
		called. This option overrides
		any information in a profile
		database.
+Ofrequently_called:filename	All	The file indicated by
		filename contains a list of
		functions, separated by
		spaces or newlines. These
		functions are assumed to be
		frequently called. This option
		overrides any information in
		a profile database.
+O[no]info	All	Display [do not display]
		information about the
		optimization process. This
		option is most useful at level
		3 and above. The default is
		+Onoinfo.
+O[no]initcheck	+O2or higher	Enable [disable]
		initialization of any local,
		scalar, automatic variable
		that is found to be
		uninitialized. The default is
		to initialize if the variable is
		uninitialized with respect to
		every path leading to its use.
		For more information about
		this option, see
		“Uninitialized variables”
		(page 144).

94 Performance and optimization