+ESfic | Generates object code with fast indirect
calls. Only correct for programs not using shared libraries. | Run-time code is faster. |
| +ESconstlit | Stores constant-qualified (const) objects and literals in read-only memory. | Data that is constant-qualified is easier to
fetch. Using this option results in improved performance in some
applications. |
+ESlit | Places string literals and constants
defined with the ANSI C const type qualifier into read-only data storage. Storing
to constants with this option will cause segmentation violations. | Reduces memory requirements and improves
run-time speed in multi-user applications. Can improve data-cache utilization. |
| +ESnolit | Disables the default behavior which causes the
HP C compiler to no longer store literals in read-only memory. | Allows you to specify that literals not be placed
in read-only memory. This is helpful with programs that violate
the semantics of const, which could result in a core dump or bus error. |
+I, +P | Enables all profile-based optimizations.
Uses execution profile data to identify the most frequently executed
code paths. Repositions functions, basic blocks, and aids other optimizations
according to these frequently executed paths. | Improves code locality and cache hit
rates. Improves efficiency of other optimizations. Benefits most applications,
especially large applications with multiple compilation units. May
be used at any optimization level. |
+O[no]clone | This option allows the user to turn on[off]
the cloning facility of the optimizer. Cloning is on by default. | This option is mainly provided for users
who may see a lot of cloning adversely affecting the performance
of their code.If inlining is turned off, cloning is turned off by default.
You cannot specify +Onoinline +Oclone. |
+O[no]memory[=malloc] | This option enables[disables] memory
optimizations. | Specifying ‘malloc’ in the
list enables[disables] optimizations which consolidate memory allocation
procedure calls. This option is disabled by default. It is incompatible
with +Oopenmp and +Oparallel, and is ignored when these options are in effect. |
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