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 automatically
determined from the input bytecode file, unless a -m option is used to override
the default.
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
- --x86-asm-syntax=att|intel
-
Specify whether to emit assembly code in AT&T syntax (the default) or intel
syntax.
- --disable-peephole
-
Disable peephole optimization pass.
- --disable-sched
-
Disable local scheduling pass.
If llc succeeds, it will exit with 0. Otherwise, if an error occurs,
it will exit with a non-zero value.
lli
Maintained by the LLVM Team (http://llvm.cs.uiuc.edu).