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NAME

       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:

              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:

              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.

AUTHORS

       Maintained by the LLVM Team (<http://llvm.org/>).