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<html>
<title>
LLVM: opt tool
</title>
<body>
<center>
<h1>LLVM: opt tool</h1>
</center>
<HR>
<h3>
NAME
</h3>
opt
<h3>
SYNOPSIS
</h3>
opt [options] [filename]
<h3>
DESCRIPTION
</h3>
The opt command is the LLVM optimizer. It takes LLVM bytecode as input, runs
the specified optimizations on it, and then outputs the optimized LLVM
bytecode.
<p>
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.
<p>
If no filename is specified on the command line, opt reads its input from
standard input.
<p>
If an output filename is not specified with the -o option, opt writes its
output to the standard output.
<h3>
OPTIONS
</h3>
<ul>
<li> -f
<br>
Force overwrite. Normally, opt will refuse to overwrite an output
file that already exists. With this option, opt will overwrite the
output file and replace it with new bytecode.
<p>
<li> -help
<br>
Print a summary of command line options.
<p>
<li> -o <filename>
<br>
Specify the output filename.
<p>
<li> -stats
<br>
Print statistics.
<p>
<li> -time-passes
<br>
Record the amount of time needed for each pass and print it to standard
error.
<p>
<li> -debug
<br>
If this is a debug build, this option will enable debug printouts from
passes which use the <tt>DEBUG</tt> macro. See the <a
href="../ProgrammersManual.html#DEBUG">Programmer's Manual</a> for more
information.
<p>
<!--
<li> -internalize-public-api-file <filename>
<br>
Preserve the symbol names listed in the file filename.
<p>
<li> -internalize-public-api-list=<list>
<br>
Perserve the symbol names specified.
<p>
-->
<li> -q
<br>
Quiet mode. Do not print messages on whether the program was modified.
<p>
<li> -load <plugin.so>
<br>
Load the dynamic object plugin.so. This object should register new
optimization passes. Once loaded, the object will add new command line
options to enable various optimizations. To see the new complete list
of optimizations, use the -help and -load options together:
<p>
opt -load <plugin.so> -help
<p>
<li> -p
<br>
Print module after each transformation.
<p>
</ul>
<h3>
EXIT STATUS
</h3>
If opt succeeds, it will exit with 0. Otherwise, if an error occurs, it
will exit with a non-zero value.
<h3>
SEE ALSO
</h3>
analyze
<HR>
<a href="http://llvm.cs.uiuc.edu">LLVM Team</a>
</body>
</html>
|
