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OPT(1)				      LLVM				  OPT(1)

NAME
     opt - LLVM optimizer

SYNOPSIS
     opt [options] [filename]

DESCRIPTION
     The  opt command is the modular LLVM optimizer and analyzer.  It takes LLVM
     source files as input, runs the specified optimizations or analyses on  it,
     and  then	outputs  the optimized file. 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 op-
     tion to determine what optimizations you can use.

     If filename is omitted from the command line or is "-", opt reads its input
     from standard input.  Inputs can be in either the	LLVM  assembly	language
     format (.ll) or the LLVM bitcode format (.bc).

     If  an  output filename is not specified with the -o option, opt writes its
     output to the standard output.

OPTIONS
     -f     Enable binary output on terminals.	Normally,  opt	will  refuse  to
	    write  raw	bitcode output if the output stream is a terminal.  With
	    this option, opt will write raw bitcode regardless of the output de-
	    vice.

     -help  Print a summary of command line options.

     -o <filename>
	    Specify the output filename.

     -S     Write output in LLVM intermediate language (instead of bitcode).

     -{passname}
	    opt provides the ability to run any of LLVM's optimization or analy-
	    sis passes in any order.  The -help  option  lists	all  the  passes
	    available.	The order in which the options occur on the command line
	    are the order in which they are executed (within pass constraints).

     -strip-debug
	    This  option  causes  opt to strip debug information from the module
	    before applying other optimizations.  It is essentially the same  as
	    -strip  but  it  ensures that stripping of debug information is done
	    first.

     -verify-each
	    This option causes opt to add a verify pass after every pass  other-
	    wise  specified  on  the  command line (including -verify).  This is
	    useful for cases where it is suspected that a pass	is  creating  an
	    invalid module but it is not clear which pass is doing it.

     -stats
	    Print statistics.

     -time-passes
	    Record the amount of time needed for each pass and print it to stan-
	    dard error.

     -debug
	    If	this  is  a debug build, this option will enable debug printouts
	    from passes which use the LLVM_DEBUG() macro.  See the LLVM Program-
	    mer's Manual, section #DEBUG for more information.

     -load=<plugin>
	    Load the dynamic object plugin.  This object should register new op-
	    timization or analysis passes.  Once loaded, the object will add new
	    command line options to enable various  optimizations  or  analyses.
	    To	see  the  new  complete list of optimizations, use the -help and
	    -load options together.  For example:

	       opt -load=plugin.so -help

     -print-passes
	    Print all available passes and exit.

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

AUTHOR
     Maintained by the LLVM Team (https://llvm.org/).

COPYRIGHT
     2003-2026, LLVM Project

19				   2026-07-30				  OPT(1)

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