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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	analy-
       ses  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 option 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 device.

       -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
	      analysis	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  mod-
	      ule  before applying other optimizations.	 It is essentially the
	      same as -strip but it ensures that stripping of  debug  informa-
	      tion is done first.

       -verify-each
	      This  option  causes  opt	 to add	a verify pass after every pass
	      otherwise	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 do-
	      ing it.

       -stats Print statistics.

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

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

       -load=<plugin>
	      Load the dynamic object plugin.  This object should register new
	      optimization 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
       2003-2025, LLVM Project

18				  2025-04-13				OPT(1)

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