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       llc - LLVM static compiler


       llc [options] [filename]


       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 executable.

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


       If filename is “-” or omitted, llc reads from standard input.   Otherwise,  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  specified,  then  llc
       creates  the  output  filename  by  taking  the  input filename, 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.

              Generate code at different optimization levels.  These correspond 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.

              Specify  the  architecture  for  which  to generate assembly, overriding 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.

              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 testing).

              Note that not all targets support all options.

              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 frame pointer elimination optimization.

              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 optimizations that assume no Inf values.

              Enable optimizations that assume no NAN values.

              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).

              Print statistics recorded by code-generation passes.

              Record the amount of time needed for each pass  and  print  a  report  to  standard

              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.

              Specify  which  EABI version should conform to.  Valid EABI versions are gnu, 4 and
              5.  Default value (default) depends on the triple.

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

              Specify the register allocator to use.  Valid register allocators are:

                 Basic register allocator.

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

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

                 Register allocator based on ‘Partitioned Boolean Quadratic Programming’.

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

                 Simple spiller

                 Local spiller

   Intel IA-32-specific Options
              Specify whether to emit assembly code in AT&T syntax (the default) or Intel syntax.


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




       Maintained by The LLVM Team (


       2003-2018, LLVM Project