HP Fortran Programmer's Guide (B3908-90031; September 2011)

Compiling and linking
Compiling with the f90 command
Chapter 2 69
• Loop transformations to improve cache performance.
• Vectorization.
The default, +Onoinfo, disables the display of informational messages about
optimization.
+O[no]initcheck
The initialization checking feature of the optimizer has three possible states: on, 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 +Onoinitcheck is 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.
+O[no]inline
+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.
The default is +Oinline at optimization level 3 and +Onoinline at the lower levels.
+O[no]inline:filename
The file indicated by filename contains a list of function names, separated by 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.
+O[no]inline=function1[,function2...]
Enable [disable] optimizer inlining for the named functions. This optimization can
occur at optimization levels 3 and 4.
The default is +Oinline.
+Oinline_budget=n
+Oinline_budget enables the optimizer to perform more aggressive inlining.
This option has the following syntax: