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opt - LLVM optimizer opt - LLVM optimizer
==================== ====================
SYNOPSIS SYNOPSIS
-------- --------
:program:`opt` [*options*] [*filename*]
**opt** [*options*] [*filename*]
DESCRIPTION DESCRIPTION
----------- -----------
The :program:`opt` command is the modular LLVM optimizer and analyzer. It
takes LLVM source files as input, runs the specified optimizations or analyses
on it, and then outputs the optimized file or the analysis results. The
function of :program:`opt` depends on whether the :option:`-analyze` option is
given.
The **opt** command is the modular LLVM optimizer and analyzer. It takes LLVM When :option:`-analyze` is specified, :program:`opt` performs various analyses
source files as input, runs the specified optimizations or analyses on it, and then of the input source. It will usually print the results on standard output, but
outputs the optimized file or the analysis results. The function of in a few cases, it will print output to standard error or generate a file with
**opt** depends on whether the **-analyze** option is given. the analysis output, which is usually done when the output is meant for another
When **-analyze** is specified, **opt** performs various analyses of the input
source. It will usually print the results on standard output, but in a few
cases, it will print output to standard error or generate a file with the
analysis output, which is usually done when the output is meant for another
program. program.
While **-analyze** is *not* given, **opt** attempts to produce an optimized While :option:`-analyze` is *not* given, :program:`opt` attempts to produce an
output file. The optimizations available via **opt** depend upon what optimized output file. The optimizations available via :program:`opt` depend
libraries were linked into it as well as any additional libraries that have upon what libraries were linked into it as well as any additional libraries
been loaded with the **-load** option. Use the **-help** option to determine that have been loaded with the :option:`-load` option. Use the :option:`-help`
what optimizations you can use. option to determine what optimizations you can use.
If *filename* is omitted from the command line or is *-*, **opt** reads its If ``filename`` is omitted from the command line or is "``-``", :program:`opt`
input from standard input. Inputs can be in either the LLVM assembly language reads its input from standard input. Inputs can be in either the LLVM assembly
format (.ll) or the LLVM bitcode format (.bc). language format (``.ll``) or the LLVM bitcode format (``.bc``).
If an output filename is not specified with the **-o** option, **opt**
writes its output to the standard output.
If an output filename is not specified with the :option:`-o` option,
:program:`opt` writes its output to the standard output.
OPTIONS OPTIONS
------- -------
.. option:: -f
Enable binary output on terminals. Normally, :program:`opt` will refuse to
write raw bitcode output if the output stream is a terminal. With this option,
:program:`opt` will write raw bitcode regardless of the output device.
**-f** .. option:: -help
Enable binary output on terminals. Normally, **opt** will refuse to
write raw bitcode output if the output stream is a terminal. With this option,
**opt** will write raw bitcode regardless of the output device.
**-help**
Print a summary of command line options. Print a summary of command line options.
.. option:: -o <filename>
**-o** *filename*
Specify the output filename. Specify the output filename.
.. option:: -S
**-S**
Write output in LLVM intermediate language (instead of bitcode). Write output in LLVM intermediate language (instead of bitcode).
.. option:: -{passname}
:program:`opt` provides the ability to run any of LLVM's optimization or
analysis passes in any order. The :option:`-help` option lists all the passes
available. The order in which the options occur on the command line are the
order in which they are executed (within pass constraints).
**-{passname}** .. option:: -std-compile-opts
**opt** provides the ability to run any of LLVM's optimization or analysis passes
in any order. The **-help** option lists all the passes available. The order in
which the options occur on the command line are the order in which they are
executed (within pass constraints).
**-std-compile-opts**
This is short hand for a standard list of *compile time optimization* passes. This is short hand for a standard list of *compile time optimization* passes.
This is typically used to optimize the output from the llvm-gcc front end. It This is typically used to optimize the output from the llvm-gcc front end. It
might be useful for other front end compilers as well. To discover the full set might be useful for other front end compilers as well. To discover the full
of options available, use the following command: set of options available, use the following command:
.. code-block:: sh .. code-block:: sh
llvm-as < /dev/null | opt -std-compile-opts -disable-output -debug-pass=Arguments llvm-as < /dev/null | opt -std-compile-opts -disable-output -debug-pass=Arguments
.. option:: -disable-inlining
This option is only meaningful when :option:`-std-compile-opts` is given. It
simply removes the inlining pass from the standard list.
.. option:: -disable-opt
**-disable-inlining** This option is only meaningful when :option:`-std-compile-opts` is given. It
disables most, but not all, of the :option:`-std-compile-opts`. The ones that
remain are :option:`-verify`, :option:`-lower-setjmp`, and
:option:`-funcresolve`.
This option is only meaningful when **-std-compile-opts** is given. It simply .. option:: -strip-debug
removes the inlining pass from the standard list.
**-disable-opt**
This option is only meaningful when **-std-compile-opts** is given. It disables
most, but not all, of the **-std-compile-opts**. The ones that remain are
**-verify**, **-lower-setjmp**, and **-funcresolve**.
**-strip-debug**
This option causes opt to strip debug information from the module before This option causes opt to strip debug information from the module before
applying other optimizations. It is essentially the same as **-strip** but it applying other optimizations. It is essentially the same as :option:`-strip`
ensures that stripping of debug information is done first. but it ensures that stripping of debug information is done first.
.. option:: -verify-each
This option causes opt to add a verify pass after every pass otherwise
specified on the command line (including :option:`-verify`). This is useful
for cases where it is suspected that a pass is creating an invalid module but
it is not clear which pass is doing it. The combination of
:option:`-std-compile-opts` and :option:`-verify-each` can quickly track down
this kind of problem.
**-verify-each** .. option:: -profile-info-file <filename>
This option causes opt to add a verify pass after every pass otherwise specified Specify the name of the file loaded by the ``-profile-loader`` option.
on the command line (including **-verify**). This is useful for cases where it
is suspected that a pass is creating an invalid module but it is not clear which
pass is doing it. The combination of **-std-compile-opts** and **-verify-each**
can quickly track down this kind of problem.
.. option:: -stats
**-profile-info-file** *filename*
Specify the name of the file loaded by the -profile-loader option.
**-stats**
Print statistics. Print statistics.
.. option:: -time-passes
**-time-passes**
Record the amount of time needed for each pass and print it to standard Record the amount of time needed for each pass and print it to standard
error. error.
.. option:: -debug
If this is a debug build, this option will enable debug printouts from passes
which use the ``DEBUG()`` macro. See the `LLVM Programmer's Manual
<../ProgrammersManual.html>`_, section ``#DEBUG`` for more information.
**-debug** .. option:: -load=<plugin>
If this is a debug build, this option will enable debug printouts
from passes which use the *DEBUG()* macro. See the **LLVM Programmer's
Manual**, section *#DEBUG* for more information.
**-load**\ =\ *plugin*
Load the dynamic object *plugin*. This object should register new optimization
or analysis passes. Once loaded, the object will add new command line options to
enable various optimizations or analyses. To see the new complete list of
optimizations, use the **-help** and **-load** options together. For example:
Load the dynamic object ``plugin``. This object should register new
optimization or analysis passes. Once loaded, the object will add new command
line options to enable various optimizations or analyses. To see the new
complete list of optimizations, use the :option:`-help` and :option:`-load`
options together. For example:
.. code-block:: sh .. code-block:: sh
opt -load=plugin.so -help opt -load=plugin.so -help
.. option:: -p
**-p**
Print module after each transformation. Print module after each transformation.
EXIT STATUS EXIT STATUS
----------- -----------
If :program:`opt` succeeds, it will exit with 0. Otherwise, if an error
If **opt** succeeds, it will exit with 0. Otherwise, if an error
occurs, it will exit with a non-zero value. occurs, it will exit with a non-zero value.