llc - LLVM static compiler
llc [options] [filename]
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
If the user has specified an architecture with the -m option, use that
Examine the input LLVM bytecode file: if it is little endian and has a
pointer size of 32 bits, select the Intel IA-32 architecture. If it is big
endian and has a pointer size of 64 bits, select the SparcV9 architecture.
If llc was compiled on an architecture for which it can generate code, select
the architecture upon which llc was compiled.
Exit with an error message telling the user to specify the output
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:
Overwrite output files. By default, llc will refuse to overwrite
an output file which already exists.
Specify the architecture for which to generate assembly. Valid
Intel IA-32 (Pentium and above)
64-bit SPARC V9
Emit C code, not assembly
Instruct the -lowerinvoke pass to insert code for correct exception handling
support. This is expensive and is by default omitted for efficiency.
Print a summary of command line options.
Print statistics recorded by code-generation passes.
Record the amount of time needed for each pass and print a report to standard
Disable frame pointer elimination optimization.
Use the 'simple' X86 instruction selector (the default).
Print generated machine code.
Specify the register allocator to use. The default allocator is local.
Valid register allocators are:
Very simple ``always spill'' register allocator
Local register allocator
Linear scan global register allocator
Iterative scan global register allocator
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:
Disable peephole optimization pass.
Disable local scheduling pass.
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.
Emit LLVM-to-machine code mapping information into the assembly output.
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 (http://llvm.cs.uiuc.edu).