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           opt [options] [filename]


           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
           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.


           -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
               Print a summary of command line options.
           -o filename
               Specify the output filename.
           -S  Write output in LLVM intermediate language (instead of bitcode).
               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).
               This is short hand for a standard list of compile time optimization
               passes.  This is typically used to optimize the output from the
               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
               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.
               Print statistics.
               Record the amount of time needed for each pass and print it to
               standard error.
               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 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 -help
           -p  Print module after each transformation.


           If opt succeeds, it will exit with 0.  Otherwise, if an error occurs,
           it will exit with a non-zero value.


           Maintained by the LLVM Team (<>).

    CVS 2010-05-07 OPT(1)


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