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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 as follows:

   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,
           -O3, and -O4 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

       -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. The default allocator is local.  Valid register
           allocators are:

           simple
               Very simple "always spill" register allocator

           local
               Local register allocator

           linearscan
               Linear scan global register allocator

           iterativescan
               Iterative scan global register allocator

       --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

AUTHORS

       Maintained by the LLVM Team (<http://llvm.org/>).