2003-09-11 19:58:03 +00:00
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<title>
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opt
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</title>
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<body>
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<center>
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<h1>Low Level Virtual Machine</h1>
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</center>
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<HR>
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<h3>
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NAME
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</h3>
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opt
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<h3>
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SYNOPSIS
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</h3>
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opt [options] < filename>
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<h3>
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DESCRIPTION
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</h3>
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The opt command is the LLVM optimizer. It takes LLVM bytecode as input, runs
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the specified optimizations on it, and then outputs the optimized code in LLVM
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bytecode.
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The optimizations available via opt depend upon what libraries it was linked
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with, as well as any additional libraries that have been loaded with the -load
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option. Use the -help option to determine what optimizations you can use.
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<h3>
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OPTIONS
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</h3>
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<ul>
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<li> -f
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<br>
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Force overwrite. Normally, opt will refuse to overwrite an output
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file that already exists. With this option, opt will overwrite the
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output file and replace it with new bytecode.
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<p>
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<li> -help
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<br>
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Print a summary of command line options.
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<p>
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<li> -o <filename>
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<br>
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Specify the output filename.
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<p>
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<li> -stats
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<br>
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Print statistics.
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<p>
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<li> -time-passes
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<br>
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Record the amount of time needed for each pass and print it to standard
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error.
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<p>
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<li> -internalize-public-api-file <filename>
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<br>
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Preserve the symbol names listed in the file filename.
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<p>
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<li> -internalize-public-api-list=<list>
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<br>
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Perserve the symbol names specified.
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<p>
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<li> -q
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<br>
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Quiet mode. Do not print messages on whether the program was modified.
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<p>
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<li> -load <plugin.so>
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<br>
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Load the dynamic object plugin.so. This object should register new
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optimization passes. Once loaded, the object will add new command line
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options to enable various optimizations. To see the new complete list
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of optimizations, use the -help and -load options together:
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<p>
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opt -load <plugin.so> -help
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<p>
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<li> -p
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<br>
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Print module after each transformation.
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<p>
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</ul>
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<h3>
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EXIT STATUS
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</h3>
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If opt succeeds, it will exit with 0. Otherwise, if an error occurs, it
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will exit with a non-zero value.
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<h3>
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SEE ALSO
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</h3>
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analyze
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<HR>
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2003-09-11 20:23:52 +00:00
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<a href="http://llvm.cs.uiuc.edu">LLVM Team</a>
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2003-09-11 19:58:03 +00:00
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</body>
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</html>
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