1OPT(1)                               LLVM                               OPT(1)
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NAME

6       opt - LLVM optimizer
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SYNOPSIS

9       opt [options] [filename]
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DESCRIPTION

12       The  opt  command is the modular LLVM optimizer and analyzer.  It takes
13       LLVM source files as input, runs the specified optimizations or  analy‐
14       ses  on  it,  and  then  outputs  the optimized file. The optimizations
15       available via opt depend upon what libraries were  linked  into  it  as
16       well  as  any additional libraries that have been loaded with the -load
17       option.  Use the -help option to determine what optimizations  you  can
18       use.
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20       If  filename  is omitted from the command line or is "-", opt reads its
21       input from standard input.  Inputs can be in either the  LLVM  assembly
22       language format (.ll) or the LLVM bitcode format (.bc).
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24       If  an  output filename is not specified with the -o option, opt writes
25       its output to the standard output.
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OPTIONS

28       -f     Enable binary output on terminals.  Normally, opt will refuse to
29              write  raw  bitcode  output  if the output stream is a terminal.
30              With this option, opt will write raw bitcode regardless  of  the
31              output device.
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33       -help  Print a summary of command line options.
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35       -o <filename>
36              Specify the output filename.
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38       -S     Write output in LLVM intermediate language (instead of bitcode).
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40       -{passname}
41              opt  provides  the  ability to run any of LLVM's optimization or
42              analysis passes in any order.  The -help option  lists  all  the
43              passes  available.   The order in which the options occur on the
44              command line are the order in which they  are  executed  (within
45              pass constraints).
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47       -strip-debug
48              This  option causes opt to strip debug information from the mod‐
49              ule before applying other optimizations.  It is essentially  the
50              same  as  -strip but it ensures that stripping of debug informa‐
51              tion is done first.
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53       -verify-each
54              This option causes opt to add a verify  pass  after  every  pass
55              otherwise  specified  on  the  command line (including -verify).
56              This is useful for cases where it is suspected that  a  pass  is
57              creating an invalid module but it is not clear which pass is do‐
58              ing it.
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60       -stats Print statistics.
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62       -time-passes
63              Record the amount of time needed for each pass and print  it  to
64              standard error.
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66       -debug If  this  is a debug build, this option will enable debug print‐
67              outs from passes which use the LLVM_DEBUG() macro.  See the LLVM
68              Programmer's Manual, section #DEBUG for more information.
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70       -load=<plugin>
71              Load the dynamic object plugin.  This object should register new
72              optimization or analysis passes.  Once loaded, the  object  will
73              add  new command line options to enable various optimizations or
74              analyses.  To see the new complete list  of  optimizations,  use
75              the -help and -load options together.  For example:
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77                 opt -load=plugin.so -help
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79       -print-passes
80              Print all available passes and exit.
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EXIT STATUS

83       If  opt  succeeds, it will exit with 0.  Otherwise, if an error occurs,
84       it will exit with a non-zero value.
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AUTHOR

87       Maintained by the LLVM Team (https://llvm.org/).
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90       2003-2023, LLVM Project
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9515                                2023-01-12                            OPT(1)
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