llc-3.9 man page on Kali

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LLC(1)				     LLVM				LLC(1)

NAME
       llc - LLVM static compiler

SYNOPSIS
       llc [options] [filename]

DESCRIPTION
       The  llc command compiles LLVM source inputs into assembly language for
       a specified architecture.  The assembly language	 output	 can  then  be
       passed  through a native assembler and linker to generate a native exe‐
       cutable.

       The choice of architecture for the output assembly  code	 is  automati‐
       cally  determined from the input file, unless the -march option is used
       to override the default.

OPTIONS
       If filename is “-” or omitted, llc reads from standard  input.	Other‐
       wise, it will from filename.  Inputs can be in either the LLVM assembly
       language format (.ll) or the LLVM bitcode format (.bc).

       If the -o option is omitted, then llc will send its output to  standard
       output if the input is from standard input.  If the -o option specifies
       “-“, then the output will also be sent to standard output.

       If no -o option is specified and an input file other than “-” is speci‐
       fied,  then  llc	 creates the output filename by taking the input file‐
       name, removing any existing .bc extension, and adding a .s suffix.

       Other llc options are described below.

   End-user Options
       -help  Print a summary of command line options.

       -O=uint
	      Generate code at different optimization  levels.	 These	corre‐
	      spond  to the -O0, -O1, -O2, and -O3 optimization levels used by
	      clang.

       -mtriple=<target triple>
	      Override the target triple specified in the input file with  the
	      specified string.

       -march=<arch>
	      Specify  the  architecture for which to generate assembly, over‐
	      riding the target encoded in the input file.  See the output  of
	      llc -help for a list of valid architectures.  By default this is
	      inferred from the target triple or autodetected to  the  current
	      architecture.

       -mcpu=<cpuname>
	      Specify  a specific chip in the current architecture to generate
	      code for.	 By default this is inferred from  the	target	triple
	      and  autodetected	 to  the  current architecture.	 For a list of
	      available CPUs, use:

		 llvm-as < /dev/null | llc -march=xyz -mcpu=help

       -filetype=<output file type>
	      Specify what kind of output llc should generated.	 Options  are:
	      asm  for	textual	 assembly ( '.s'), obj for native object files
	      ('.o') and null for not emitting anything (for performance test‐
	      ing).

	      Note that not all targets support all options.

       -mattr=a1,+a2,-a3,...
	      Override	or  control specific attributes of the target, such as
	      whether SIMD operations are enabled or not.  The default set  of
	      attributes  is  set by the current CPU.  For a list of available
	      attributes, use:

		 llvm-as < /dev/null | llc -march=xyz -mattr=help

       --disable-fp-elim
	      Disable frame pointer elimination optimization.

       --disable-excess-fp-precision
	      Disable optimizations that  may  produce	excess	precision  for
	      floating	point.	 Note  that  this option can dramatically slow
	      down code on some systems (e.g. X86).

       --enable-no-infs-fp-math
	      Enable optimizations that assume no Inf values.

       --enable-no-nans-fp-math
	      Enable optimizations that assume no NAN values.

       --enable-unsafe-fp-math
	      Enable optimizations that make  unsafe  assumptions  about  IEEE
	      math (e.g. that addition is associative) or may not work for all
	      input ranges.  These optimizations allow the code	 generator  to
	      make  use	 of  some  instructions	 which	would otherwise not be
	      usable (such as fsin on X86).

       --stats
	      Print statistics recorded by code-generation passes.

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

       --load=<dso_path>
	      Dynamically  load	 dso_path  (a  path  to	 a  dynamically shared
	      object) that implements an LLVM target.  This  will  permit  the
	      target  name  to be used with the -march option so that code can
	      be generated for that target.

       -meabi=[default|gnu|4|5]
	      Specify which EABI version should conform to.  Valid  EABI  ver‐
	      sions  are gnu, 4 and 5.	Default value (default) depends on the
	      triple.

   Tuning/Configuration Options
       --print-machineinstrs
	      Print generated machine code between compilation phases  (useful
	      for debugging).

       --regalloc=<allocator>
	      Specify  the  register allocator to use.	Valid register alloca‐
	      tors are:

	      basic
		 Basic register allocator.

	      fast
		 Fast register allocator. It is the  default  for  unoptimized
		 code.

	      greedy
		 Greedy	 register  allocator.  It is the default for optimized
		 code.

	      pbqp
		 Register allocator based on  ‘Partitioned  Boolean  Quadratic
		 Programming’.

       --spiller=<spiller>
	      Specify  the spiller to use for register allocators that support
	      it.  Currently this option is used only by the linear scan  reg‐
	      ister  allocator.	 The default spiller is local.	Valid spillers
	      are:

	      simple
		 Simple spiller

	      local
		 Local spiller

   Intel IA-32-specific Options
       --x86-asm-syntax=[att|intel]
	      Specify whether to  emit	assembly  code	in  AT&T  syntax  (the
	      default) or Intel syntax.

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

SEE ALSO
       lli

AUTHOR
       Maintained by The LLVM Team (http://llvm.org/).

COPYRIGHT
       2003-2017, LLVM Project

3.9				  2017-12-22				LLC(1)
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