HP Fortran Programmer Guide (766160-001, March 2014)

inlining. This option has the following
syntax:
+Oinline_budget=n
where n is an integer in the range 1 -
1000000 that specifies the level of
aggressiveness, as listed in Table on page
70.
The +Onolimit and +Osize options
also affect inlining. Specifying the
+Onolimitoption has the same effect as
specifying +Oinline_budget=200. The
+Osize option has the same effect as
+Oinline_budget=1.
Note, however, that the
+Oinline_budget option takes
precedence over both of these options.
This means that you can override the effect
of +Onolimit or +Osizeoption on
inlining by specifying the
+Oinline_budgetoption on the same
command line.
This option is only effective at optimization
level 3 or higher.
Table 19 Values for the +Oinline_budget option
MeaningValues for n
Default level of inlining.= 100
More aggressive inlining. The optimizer is less restricted by compilation time and code size
when searching for eligible routines to inline.
> 100
Less aggressive inlining. The optimizer gives more weight to compilation time and code size
when determining whether to inline.
2 - 99
Only inline if it reduces code size.= 1
invokes millicode versions of a number of frequently called intrinsic functions; see Table on page
70. Millicode routines have very low call overhead and provide no error-handling. Use this
+O[no]libcalls
option to improve the performance of selected library routines only when your program does
not depend upon exception-handling.
The default is +Onolibcallsat optimization levels 0 and 1; at optimization level 2 or higher,
the default is +Olibcalls.
Table 20 Millicode versions of intrinsic functions
powcosacos
sinexpasin
tanlogatan
log10atan2
Enable [disable] support for errnoin libm functions.
The default is +Onolibmerrno.
+o[no]libmerrno
+O[no]loop_blockenables or disables blocking of
eligible loops for improved cache performance. The
+O[no]loop_block
+Onoloop_blockoption disables both automatic and
directive-specified loop blocking.
Fine-tuning optimization options 45