HP UX Fortran Software manual +Orecovery

Table 29 Fine-tuning optimization options (continued)

Level	Level	Function
		NOTE:	The optimizer tries
		to determine the most likely
		target of indirect calls. If the
		profile data is incomplete or
		ambiguous, the optimizer
		may not select the best
		target. If this happens, your
		code’s performance may
		decrease.
		This option can be used at
		optimization levels 3 and 4.
		At +O3, it is only effective if
		indirect calls from functions
		within a file are mostly to
		target functions within the
		same file. This is because
		+O3optimizes only within a
		file whereas, +O4optimizes
		across files.
		The default is
		+Opromote_indirect_callsat
		optimization level 3 and
		above.
		+Onopromote_indirect_callswill
		be the default at
		optimization level 2 and
		below.
+Orarely_called=function1[,function2...]	All	The named functions are
		assumed to be rarely called.
		This option overrides any
		information in a profile
		database.
+Orarely_called:filename		The file indicated by
		filename contains a list of
		functions, separated by
		spaces or newlines. These
		functions are assumed to be
		rarely called. This option
		overrides any information in
		a profile database.
+O[no]recovery	All	This option generates [does
		not generate] recovery code
		for control speculation. For
		code that writes to
		uncacheable memory that
		may not be properly
		identified as volatile, the
		+Orecoveryoption reduces
		the risk of incorrect
		behavior. The default is
		+Orecovery.
		NOTE:	The program that
		uses signal handlers to catch
		signals raised by memory
		accesses may not behave
		correctly under
		+Onorecovery.

Using options to control optimization 97