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

determine whether the compiler optimized
time-critical sections of your program. It
can be used at any level of optimization
but is most useful at level 3.
Currently, this option provides feedback
for the following optimizations:
• Cloning, the replacement of a call to
a routine by a call to a clone, which
is a copy of the routine with changes
specific to that call site.
• Inlining.
• Loop transformations to improve cache
performance.
• Vectorization
The default, +Onoinfo, disables the
display of informational messages about
optimization.
The initialization checking feature of the
optimizer has three possible states: on,
+O[no]initcheck
off, or unspecified. When this option is
specified in the on state (+Oinitcheck),
the optimizer initializes to zero any local,
nonarray, nonstatic variables that are
uninitialized with respect to at least one
path leading to a use of the variable.
When +Onoinitcheckis specified, the
optimizer issues warning messages when
it discovers definitely uninitialized
variables, but does not initialize them.
When this option is unspecified, the
optimizer initializes to zero any local,
scalar, nonstatic variables that are
definitely uninitialized with respect to all
paths leading to a use of the variable.
This option is only effective at optimization
level 2 or higher.
+Oinline makes all subprograms
eligible for inlining. This option is only
effective at optimization level 3 or higher.
The +Onoinline option disables inlining
for all subprograms in your program.
+O[no]inline
The default is +Oinline at optimization
level 3 and +Onoinline at the lower levels.
The file indicated by filename contains a
list of function names, separated by
+O[no]inline:filename
spaces or newlines. This option enables
[disables] optimizer inlining for the named
functions. This optimization can occur at
optimization levels 3 and 4.
The default is +Oinline.
Enable [disable] optimizer inlining for the
named functions. This optimization can
occur at optimization levels 3 and 4.
The default is +Oinline.
+O[no]inline=function1[,function2...]
+Oinline_budget enables the
optimizer to perform more aggressive
+Oinline_budget=n
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