NAME

llc - LLVM static compiler


SYNOPSIS

llc [options] [filename]


DESCRIPTION

The llc command compiles LLVM bytecode into assembly language for a specified architecture. The assembly language output can then be passed through a native assembler and linker to generate native code.

The choice of architecture for the output assembly code is determined as follows, by attempting to satisfy each of the following rules in turn (first one wins):


OPTIONS

If filename is - or omitted, llc reads LLVM bytecode from standard input. Otherwise, it will read LLVM bytecode from filename.

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:

-f
Overwrite output files. By default, llc will refuse to overwrite an output file which already exists.

-march=arch
Specify the architecture for which to generate assembly. Valid architectures are:
x86
Intel IA-32 (Pentium and above)

sparcv9
64-bit SPARC V9

c
Emit C code, not assembly

-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.

-help
Print a summary of command line options.

-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.

Intel IA-32-specific Options

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

--disable-pattern-isel
Use the 'simple' X86 instruction selector (the default).

--print-machineinstrs
Print generated machine code.

--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 (experimental)

--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

SPARCV9-specific Options

--disable-peephole
Disable peephole optimization pass.

--disable-sched
Disable local scheduling pass.

--disable-strip
The Sparc backend embeds the LLVM bytecode into the assembly output. This option requests that symbol names be retained; by default, they are stripped out.

--enable-maps
Emit LLVM-to-machine code mapping information into the assembly output.


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.cs.uiuc.edu).