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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
       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.

OPTIONS
       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.

       -O=uint
              Generate code at different optimization levels.  These
              correspond to the -O0, -O1, -O2, and -O3 optimization levels
              used by llvm-gcc and 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,
              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.

       -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
              testing).

              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).

       --enable-correct-eh-support
              Instruct the lowerinvoke pass to insert code for correct
              exception handling support.  This is expensive and is by default
              omitted for efficiency.

       --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.

   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
              allocators 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
              register 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
       2003-2013, LLVM Project

3.4                               2016-02-17                            LLC(1)