LLVM: llc tool

NAME

llc

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:

If the user has specified an architecture with the -m option, use that architecture.
Examine the input LLVM bytecode file:
- If it specifies little endian and a pointer size of 32 bits, select the x86 architecture.
- If it specifies big endian and a pointer size of 64 bit pointers, 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.
Print a message to the user asking him or her to specify the output architecture explicitly.

If filename is not specified, or if filename is -, llc reads its input from standard input. Otherwise, it will read its input from filename.

If the -o option is left unspecified, 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 as follows:

If the file ends in .bc, then the .bc suffix is removed, and the .s suffix is appended.
Otherwise, the .s suffix is appended to the input filename.

OPTIONS

-disable-fp-elim
Disable frame pointer elimination optimization.
-disable-local-ra
Use Simple RA instead of Local RegAlloc.
-disable-pattern-isel
Use the 'simple' X86 instruction selector.
-disable-peephole
Disable peephole optimization pass.
-disable-preopt
Disable optimizations prior to instruction selection.
-disable-sched
Disable local scheduling pass.
-disable-strip
Do not strip the LLVM bytecode included in executable.
-enable-maps
Emit LLVM-to-MachineCode mapping info to assembly.
-f
Overwrite output files
-load=<plugin.so>
Load the specified plugin.
-m<arch>
Specify the architecture for which to generate assembly. Valid architectures are:
x86
IA-32 (Pentium and above)
sparc
SPARC V9
-o <filename>
Specify the output filename.
-print-machineinstrs
Print generated machine code.
-help
Print a summary of command line options.
-stats
Print statistics.
-time-passes
Record the amount of time needed for each pass and print it to standard error.

EXIT STATUS