HP UX Fortran Software manual Is +Onofastaccess at, +Ofastaccess at level, +O2, +Ofltacc=relaxed

Table 29 Fine-tuning optimization options (continued)

Level	Level	Function
		collisions. The default is
		+Onocache_pad_common.
+O[no]dataprefetch	+O2 or higher	Insert [do not insert]
		instructions within innermost
		loops to explicitly prefetch
		data from memory into the
		data cache. The default is
		+Onodataprefetch.
+O[no]dynopt	All	Enable [disable] dynamic
		optimization for the output
		file, if the run-time
		environment supports this
		feature. Both forms of this
		option change the default
		setting, which allows the
		run-time environment to
		enable or disable dynamic
		optimization according to a
		system-wide default. This
		option applies only to
		executable files and shared
		libraries.chatr(1) can be
		used to change this setting,
		including restoration of the
		default setting, after the
		output file has been created.
+O[no]entrysched	All	Perform [do not perform]
		instruction scheduling on
		entry and exit code. The
		default is
		+Onoentrysched.
		NOTE: This option is valid
		only on the PA-RISC systems.
+O[no]fastaccess	All	Enable [disable] fast access
		to global data. The default
		is +Onofastaccessat
		levels 1, 2, and 3;
		+Ofastaccessat level 4.
+Ofast	All	Select a combination of
		optimization options for
		optimum execution speed
		and reasonable build times.
		Currently chosen options
		are:
		•	+O2
		•	+Ofltacc=relaxed
		•	+Onolimit
		•	+DSnative
		•	+FPD
		•	Wl,+pi,1M-
		•	-Wl,+pd,1M
		•	-Wl,+mergeseg

Using options to control optimization 93