HP UX Fortran Software manual +Oinlinelevel num, +Onolibcalls, +Olibcalls, +Onoloopunroll=n

Table 29 Fine-tuning optimization options (continued)

Level	Level	Function
+O[no]inline	+O3or higher	Enable [disable] inlining.
		The default is +Oinline.
+Oinline_level num	All	This option controls inlining
		in fortran. The format for
		num is N[.n], where num is
		either an integral value from
		0 to 9 or a value with a
		single decimal place from
		0.0 to 9.0.
		For more information on this
		option, see
		F90((1))manpage.
+O[no]libcalls	All	Substitute [do not substitute]
		millicode versions of specific
		intrinsics. The default is
		+Olibcalls.
+O[no]loop_block	+O3or higher	Loop blocking is a
		combination of strip mining
		and interchange that
		improves data cache
		locality. It is provided
		primarily to deal with nested
		loops that manipulate arrays
		that are too large to fit into
		the data cache. Under
		certain circumstances, loop
		blocking allows reuse of
		these arrays by transforming
		the loops that manipulate
		them so that they manipulate
		strips of the arrays that fit
		into the cache.
+O[no]loop_unroll=n	+O2or higher	Unroll [do not unroll]
		program loops by a factor
		of n. The default is
		+Oloop_unroll=4.
+O[no]loop_unroll_jam	+O3or higher	Loop unroll-and-jam involves
		partially unrolling one or
		more loops higher in the nest
		than the innermost loop, and
		fusing ("jamming") the
		resulting loops back
		together. This transformation
		is primarily intended to
		increase register reuse and
		decrease memory loads and
		stores per operation within
		an iteration of a nested loop.
+moduleoptimize	All	The compiler reads only
		required information from a
		module file. Optimized
		module files are created by
		discarding redundant
		information while importing
		the module file. In case of
		nested modules or
		hierarchical modules, the
		compilation time and
		memory requirement of

Using options to control optimization 95