man llc (Commandes) - LLVM static compiler

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 automatically determined from the input bytecode file, unless a -m option is used to override the default.

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)
ppc32
32-bit PowerPC (MacOS X, 32-bit ABI)
sparcv9
64-bit SPARC V9
c
Emit C code, not assembly
--disable-fp-elim
Disable frame pointer elimination optimization.
--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.
--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.

SPARCV9-specific Options

--disable-peephole
Disable peephole optimization pass.
--disable-sched
Disable local scheduling pass.

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>).