2 .TH "OPT" "1" "2013-06-10" "3.3" "LLVM"
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36 \fBopt\fP [\fIoptions\fP] [\fIfilename\fP]
39 The \fBopt\fP command is the modular LLVM optimizer and analyzer. It
40 takes LLVM source files as input, runs the specified optimizations or analyses
41 on it, and then outputs the optimized file or the analysis results. The
42 function of \fBopt\fP depends on whether the \fI\-analyze\fP option is
45 When \fI\-analyze\fP is specified, \fBopt\fP performs various analyses
46 of the input source. It will usually print the results on standard output, but
47 in a few cases, it will print output to standard error or generate a file with
48 the analysis output, which is usually done when the output is meant for another
51 While \fI\-analyze\fP is \fInot\fP given, \fBopt\fP attempts to produce an
52 optimized output file. The optimizations available via \fBopt\fP depend
53 upon what libraries were linked into it as well as any additional libraries
54 that have been loaded with the \fI\%-load\fP option. Use the \fI\%-help\fP
55 option to determine what optimizations you can use.
57 If \fBfilename\fP is omitted from the command line or is "\fB\-\fP", \fBopt\fP
58 reads its input from standard input. Inputs can be in either the LLVM assembly
59 language format (\fB.ll\fP) or the LLVM bitcode format (\fB.bc\fP).
61 If an output filename is not specified with the \fI\%-o\fP option,
62 \fBopt\fP writes its output to the standard output.
67 Enable binary output on terminals. Normally, \fBopt\fP will refuse to
68 write raw bitcode output if the output stream is a terminal. With this option,
69 \fBopt\fP will write raw bitcode regardless of the output device.
74 Print a summary of command line options.
79 Specify the output filename.
84 Write output in LLVM intermediate language (instead of bitcode).
89 \fBopt\fP provides the ability to run any of LLVM\(aqs optimization or
90 analysis passes in any order. The \fI\%-help\fP option lists all the passes
91 available. The order in which the options occur on the command line are the
92 order in which they are executed (within pass constraints).
96 .B \-std\-compile\-opts
97 This is short hand for a standard list of \fIcompile time optimization\fP passes.
98 This is typically used to optimize the output from the llvm\-gcc front end. It
99 might be useful for other front end compilers as well. To discover the full
100 set of options available, use the following command:
106 llvm\-as < /dev/null | opt \-std\-compile\-opts \-disable\-output \-debug\-pass=Arguments
114 .B \-disable\-inlining
115 This option is only meaningful when \fI\%-std-compile-opts\fP is given. It
116 simply removes the inlining pass from the standard list.
121 This option is only meaningful when \fI\%-std-compile-opts\fP is given. It
122 disables most, but not all, of the \fI\%-std-compile-opts\fP. The ones that
123 remain are \fI\-verify\fP, \fI\-lower\-setjmp\fP, and
129 This option causes opt to strip debug information from the module before
130 applying other optimizations. It is essentially the same as \fI\-strip\fP
131 but it ensures that stripping of debug information is done first.
136 This option causes opt to add a verify pass after every pass otherwise
137 specified on the command line (including \fI\-verify\fP). This is useful
138 for cases where it is suspected that a pass is creating an invalid module but
139 it is not clear which pass is doing it. The combination of
140 \fI\%-std-compile-opts\fP and \fI\%-verify-each\fP can quickly track down
141 this kind of problem.
145 .B \-profile\-info\-file <filename>
146 Specify the name of the file loaded by the \fB\-profile\-loader\fP option.
156 Record the amount of time needed for each pass and print it to standard
162 If this is a debug build, this option will enable debug printouts from passes
163 which use the \fBDEBUG()\fP macro. See the \fI\%LLVM Programmer's Manual\fP, section \fB#DEBUG\fP for more information.
168 Load the dynamic object \fBplugin\fP. This object should register new
169 optimization or analysis passes. Once loaded, the object will add new command
170 line options to enable various optimizations or analyses. To see the new
171 complete list of optimizations, use the \fI\%-help\fP and \fI\%-load\fP
172 options together. For example:
178 opt \-load=plugin.so \-help
187 Print module after each transformation.
191 If \fBopt\fP succeeds, it will exit with 0. Otherwise, if an error
192 occurs, it will exit with a non\-zero value.
194 Maintained by The LLVM Team (http://llvm.org/).
196 2003-2013, LLVM Project
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