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"LLC" "1" "2012-08-16" "3.2" "LLVM"
NAME
llc - LLVM static compiler
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SYNOPSIS
llc [options] [filename]
DESCRIPTION
The llc command compiles LLVM source inputs into assembly language for a
specified architecture. The assembly language output can then be passed through
a native assembler and linker to generate a native executable.
The choice of architecture for the output assembly code is automatically
determined from the input file, unless the -march option is used to override
the default.
OPTIONS
If filename is - or omitted, llc reads from standard input. Otherwise, it
will from filename. Inputs can be in either the LLVM assembly language
format (.ll) or the LLVM bitcode format (.bc).
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:
End-user Options
-help
NDENT 0.0 NDENT 3.5 Print a summary of command line options.
NINDENT NINDENT -O=uint
NDENT 0.0 NDENT 3.5 Generate code at different optimization levels. These correspond to the -O0,
-O1, -O2, and -O3 optimization levels used by llvm-gcc and
clang.
NINDENT NINDENT -mtriple=target triple
NDENT 0.0 NDENT 3.5 Override the target triple specified in the input file with the specified
string.
NINDENT NINDENT -march=arch
NDENT 0.0 NDENT 3.5 Specify the architecture for which to generate assembly, overriding the target
encoded in the input file. See the output of llc -help for a list of
valid architectures. By default this is inferred from the target triple or
autodetected to the current architecture.
NINDENT NINDENT -mcpu=cpuname
NDENT 0.0 NDENT 3.5 Specify a specific chip in the current architecture to generate code for.
By default this is inferred from the target triple and autodetected to
the current architecture. For a list of available CPUs, use:
llvm-as < /dev/null | llc -march=xyz -mcpu=help
NINDENT NINDENT -mattr=a1,+a2,-a3,...
NDENT 0.0 NDENT 3.5 Override or control specific attributes of the target, such as whether SIMD
operations are enabled or not. The default set of attributes is set by the
current CPU. For a list of available attributes, use:
llvm-as < /dev/null | llc -march=xyz -mattr=help
NINDENT NINDENT --disable-fp-elim
NDENT 0.0 NDENT 3.5 Disable frame pointer elimination optimization.
NINDENT NINDENT --disable-excess-fp-precision
NDENT 0.0 NDENT 3.5 Disable optimizations that may produce excess precision for floating point.
Note that this option can dramatically slow down code on some systems
(e.g. X86).
NINDENT NINDENT --enable-no-infs-fp-math
NDENT 0.0 NDENT 3.5 Enable optimizations that assume no Inf values.
NINDENT NINDENT --enable-no-nans-fp-math
NDENT 0.0 NDENT 3.5 Enable optimizations that assume no NAN values.
NINDENT NINDENT --enable-unsafe-fp-math
NDENT 0.0 NDENT 3.5 Enable optimizations that make unsafe assumptions about IEEE math (e.g. that
addition is associative) or may not work for all input ranges. These
optimizations allow the code generator to make use of some instructions which
would otherwise not be usable (such as fsin on X86).
NINDENT NINDENT --enable-correct-eh-support
NDENT 0.0 NDENT 3.5 Instruct the lowerinvoke pass to insert code for correct exception handling
support. This is expensive and is by default omitted for efficiency.
NINDENT NINDENT --stats
NDENT 0.0 NDENT 3.5 Print statistics recorded by code-generation passes.
NINDENT NINDENT --time-passes
NDENT 0.0 NDENT 3.5 Record the amount of time needed for each pass and print a report to standard
error.
NINDENT NINDENT --load=dso_path
NDENT 0.0 NDENT 3.5 Dynamically load dso_path (a path to a dynamically shared object) that
implements an LLVM target. This will permit the target name to be used with the
-march option so that code can be generated for that target.
NINDENT NINDENT Tuning/Configuration Options
--print-machineinstrs
NDENT 0.0 NDENT 3.5 Print generated machine code between compilation phases (useful for debugging).
NINDENT NINDENT --regalloc=allocator
NDENT 0.0 NDENT 3.5 Specify the register allocator to use. The default allocator is local.
Valid register allocators are:
simple
NDENT 0.0 NDENT 3.5 Very simple "always spill" register allocator
NINDENT NINDENT local
NDENT 0.0 NDENT 3.5 Local register allocator
NINDENT NINDENT linearscan
NDENT 0.0 NDENT 3.5 Linear scan global register allocator
NINDENT NINDENT iterativescan
NDENT 0.0 NDENT 3.5 Iterative scan global register allocator
NINDENT NINDENT NINDENT NINDENT --spiller=spiller
NDENT 0.0 NDENT 3.5 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
NDENT 0.0 NDENT 3.5 Simple spiller
NINDENT NINDENT local
NDENT 0.0 NDENT 3.5 Local spiller
NINDENT NINDENT NINDENT NINDENT Intel IA-32-specific Options
--x86-asm-syntax=att|intel
NDENT 0.0 NDENT 3.5 Specify whether to emit assembly code in AT&T syntax (the default) or intel
syntax.
NINDENT NINDENT 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|lli
AUTHOR
Maintained by The LLVM Team (http://llvm.org/).
COPYRIGHT
2012, LLVM Project
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