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authorDaniel Dunbar <daniel@zuster.org>2012-05-08 16:50:35 +0000
committerDaniel Dunbar <daniel@zuster.org>2012-05-08 16:50:35 +0000
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+opt - LLVM optimizer
+====================
+
+
+SYNOPSIS
+--------
+
+
+**opt** [*options*] [*filename*]
+
+
+DESCRIPTION
+-----------
+
+
+The **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
+**opt** depends on whether the **-analyze** option is given.
+
+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.
+
+While **-analyze** is *not* given, **opt** attempts to produce an optimized
+output file. The optimizations available via **opt** depend upon what
+libraries were linked into it as well as any additional libraries that have
+been loaded with the **-load** option. Use the **-help** option to determine
+what optimizations you can use.
+
+If *filename* is omitted from the command line or is *-*, **opt** reads its
+input from standard input. Inputs can be in either the LLVM assembly 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.
+
+
+OPTIONS
+-------
+
+
+
+**-f**
+
+ 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.
+
+
+
+**-o** *filename*
+
+ Specify the output filename.
+
+
+
+**-S**
+
+ Write output in LLVM intermediate language (instead of bitcode).
+
+
+
+**-{passname}**
+
+ **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 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
+ of options available, use the following command:
+
+
+ .. code-block:: perl
+
+ llvm-as < /dev/null | opt -std-compile-opts -disable-output -debug-pass=Arguments
+
+
+
+
+**-disable-inlining**
+
+ This option is only meaningful when **-std-compile-opts** is given. It simply
+ 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
+ applying other optimizations. It is essentially the same as **-strip** but it
+ ensures that stripping of debug information is done first.
+
+
+
+**-verify-each**
+
+ This option causes opt to add a verify pass after every pass otherwise specified
+ 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.
+
+
+
+**-profile-info-file** *filename*
+
+ Specify the name of the file loaded by the -profile-loader option.
+
+
+
+**-stats**
+
+ Print statistics.
+
+
+
+**-time-passes**
+
+ Record the amount of time needed for each pass and print it to standard
+ error.
+
+
+
+**-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**, 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:
+
+
+ .. code-block:: perl
+
+ opt -load=plugin.so -help
+
+
+
+
+**-p**
+
+ Print module after each transformation.
+
+
+
+
+EXIT STATUS
+-----------
+
+
+If **opt** succeeds, it will exit with 0. Otherwise, if an error
+occurs, it will exit with a non-zero value.