d409305fa3
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp to llvmorg-12.0.0-0-gd28af7c654d8, a.k.a. 12.0.0 release. PR: 255570 MFC after: 6 weeks
171 lines
5.0 KiB
Groff
171 lines
5.0 KiB
Groff
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.TH "OPT" "1" "2021-06-07" "12" "LLVM"
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.SH NAME
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opt \- LLVM optimizer
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.SH SYNOPSIS
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.sp
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\fBopt\fP [\fIoptions\fP] [\fIfilename\fP]
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.SH DESCRIPTION
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.sp
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The \fBopt\fP command is the modular LLVM optimizer and analyzer. It
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takes LLVM source files as input, runs the specified optimizations or analyses
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on it, and then outputs the optimized file or the analysis results. The
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function of \fBopt\fP depends on whether the \fI\-analyze\fP option is
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given.
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.sp
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When \fI\-analyze\fP is specified, \fBopt\fP performs various analyses
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of the input source. It will usually print the results on standard output, but
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in a few cases, it will print output to standard error or generate a file with
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the analysis output, which is usually done when the output is meant for another
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program.
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.sp
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While \fI\-analyze\fP is \fInot\fP given, \fBopt\fP attempts to produce an
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optimized output file. The optimizations available via \fBopt\fP depend
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upon what libraries were linked into it as well as any additional libraries
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that have been loaded with the \fI\%\-load\fP option. Use the \fI\%\-help\fP
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option to determine what optimizations you can use.
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.sp
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If \fBfilename\fP is omitted from the command line or is "\fB\-\fP", \fBopt\fP
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reads its input from standard input. Inputs can be in either the LLVM assembly
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language format (\fB\&.ll\fP) or the LLVM bitcode format (\fB\&.bc\fP).
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.sp
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If an output filename is not specified with the \fI\%\-o\fP option,
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\fBopt\fP writes its output to the standard output.
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.SH OPTIONS
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.INDENT 0.0
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.TP
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.B \-f
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Enable binary output on terminals. Normally, \fBopt\fP will refuse to
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write raw bitcode output if the output stream is a terminal. With this option,
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\fBopt\fP will write raw bitcode regardless of the output device.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-help
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Print a summary of command line options.
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.UNINDENT
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.TP
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.B \-o <filename>
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Specify the output filename.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-S
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Write output in LLVM intermediate language (instead of bitcode).
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-{passname}
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\fBopt\fP provides the ability to run any of LLVM\(aqs optimization or
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analysis passes in any order. The \fI\%\-help\fP option lists all the passes
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available. The order in which the options occur on the command line are the
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order in which they are executed (within pass constraints).
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-disable\-inlining
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This option simply removes the inlining pass from the standard list.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-disable\-opt
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This option is only meaningful when \fI\-std\-link\-opts\fP is given. It
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disables most passes.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-strip\-debug
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This option causes opt to strip debug information from the module before
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applying other optimizations. It is essentially the same as \fI\-strip\fP
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but it ensures that stripping of debug information is done first.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-verify\-each
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This option causes opt to add a verify pass after every pass otherwise
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specified on the command line (including \fI\-verify\fP). This is useful
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for cases where it is suspected that a pass is creating an invalid module but
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it is not clear which pass is doing it.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-stats
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Print statistics.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-time\-passes
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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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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-debug
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If this is a debug build, this option will enable debug printouts from passes
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which use the \fBLLVM_DEBUG()\fP macro. See the \fI\%LLVM Programmer\(aqs Manual\fP, section \fB#DEBUG\fP for more information.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-load=<plugin>
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Load the dynamic object \fBplugin\fP\&. This object should register new
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optimization or analysis passes. Once loaded, the object will add new command
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line options to enable various optimizations or analyses. To see the new
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complete list of optimizations, use the \fI\%\-help\fP and \fI\%\-load\fP
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options together. For example:
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.INDENT 7.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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opt \-load=plugin.so \-help
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-p
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Print module after each transformation.
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.UNINDENT
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.SH EXIT STATUS
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.sp
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If \fBopt\fP succeeds, it will exit with 0. Otherwise, if an error
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occurs, it will exit with a non\-zero value.
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.SH AUTHOR
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Maintained by the LLVM Team (https://llvm.org/).
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.SH COPYRIGHT
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2003-2021, LLVM Project
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