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121 lines
2.7 KiB
HTML
121 lines
2.7 KiB
HTML
<html>
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<title>LLVM: opt tool</title>
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<body bgcolor=white>
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<center><h1>LLVM: <tt>opt</tt> tool</h1></center>
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<HR>
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<h3>NAME</h3>
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<tt>opt</tt>
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<h3>SYNOPSIS</h3>
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<tt>opt [options] [filename]</tt>
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<h3>DESCRIPTION</h3>
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The <tt>opt</tt> command is the modular LLVM optimizer. It takes LLVM bytecode
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as input, runs the specified optimizations on it, and then outputs the optimized
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LLVM bytecode.
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<p>
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The optimizations available via <tt>opt</tt> depend upon what libraries were
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linked into it as well as any additional libraries that have been loaded with
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the <tt>-load</tt> option. Use the <tt>-help</tt> option to determine what
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optimizations you can use.
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<p>
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If no filename is specified on the command line, <tt>opt</tt> reads its input
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from standard input.
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<p>
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If an output filename is not specified with the <tt>-o</tt> option, <tt>opt</tt>
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writes its output to the standard output.
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<h3>OPTIONS</h3>
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<ul>
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<li> -f
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<br>
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Force overwrite. Normally, <tt>opt</tt> will refuse to overwrite an
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output file that already exists. With this option, <tt>opt</tt> will
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overwrite the 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> -debug
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<br>
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If this is a debug build, this option will enable debug printouts from
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passes which use the <tt>DEBUG</tt> macro. See the <a
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href="../ProgrammersManual.html#DEBUG">Programmer's Manual</a> for more
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information.
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<p>
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<!--
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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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-->
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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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<tt>opt -load <plugin.so> -help</tt>
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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>EXIT STATUS</h3>
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If <tt>opt</tt> succeeds, it will exit with 0. Otherwise, if an error occurs,
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it will exit with a non-zero value.
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<h3>SEE ALSO</h3>
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<a href="analyze.html"><tt>analyze</tt></a>
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<HR>
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Maintained by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a>.
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</body>
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</html>
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