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252 lines
4.9 KiB
ReStructuredText
252 lines
4.9 KiB
ReStructuredText
llc - LLVM static compiler
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==========================
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SYNOPSIS
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--------
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**llc** [*options*] [*filename*]
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DESCRIPTION
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-----------
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The **llc** command compiles LLVM source inputs into assembly language for a
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specified architecture. The assembly language output can then be passed through
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a native assembler and linker to generate a native executable.
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The choice of architecture for the output assembly code is automatically
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determined from the input file, unless the **-march** option is used to override
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the default.
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OPTIONS
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-------
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If *filename* is - or omitted, **llc** reads from standard input. Otherwise, it
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will from *filename*. Inputs can be in either the LLVM assembly language
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format (.ll) or the LLVM bitcode format (.bc).
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If the **-o** option is omitted, then **llc** will send its output to standard
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output if the input is from standard input. If the **-o** option specifies -,
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then the output will also be sent to standard output.
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If no **-o** option is specified and an input file other than - is specified,
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then **llc** creates the output filename by taking the input filename,
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removing any existing *.bc* extension, and adding a *.s* suffix.
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Other **llc** options are as follows:
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End-user Options
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~~~~~~~~~~~~~~~~
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**-help**
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Print a summary of command line options.
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**-O**\ =\ *uint*
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Generate code at different optimization levels. These correspond to the *-O0*,
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*-O1*, *-O2*, and *-O3* optimization levels used by **llvm-gcc** and
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**clang**.
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**-mtriple**\ =\ *target triple*
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Override the target triple specified in the input file with the specified
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string.
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**-march**\ =\ *arch*
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Specify the architecture for which to generate assembly, overriding the target
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encoded in the input file. See the output of **llc -help** for a list of
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valid architectures. By default this is inferred from the target triple or
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autodetected to the current architecture.
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**-mcpu**\ =\ *cpuname*
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Specify a specific chip in the current architecture to generate code for.
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By default this is inferred from the target triple and autodetected to
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the current architecture. For a list of available CPUs, use:
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**llvm-as < /dev/null | llc -march=xyz -mcpu=help**
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**-mattr**\ =\ *a1,+a2,-a3,...*
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Override or control specific attributes of the target, such as whether SIMD
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operations are enabled or not. The default set of attributes is set by the
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current CPU. For a list of available attributes, use:
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**llvm-as < /dev/null | llc -march=xyz -mattr=help**
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**--disable-fp-elim**
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Disable frame pointer elimination optimization.
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**--disable-excess-fp-precision**
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Disable optimizations that may produce excess precision for floating point.
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Note that this option can dramatically slow down code on some systems
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(e.g. X86).
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**--enable-no-infs-fp-math**
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Enable optimizations that assume no Inf values.
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**--enable-no-nans-fp-math**
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Enable optimizations that assume no NAN values.
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**--enable-unsafe-fp-math**
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Enable optimizations that make unsafe assumptions about IEEE math (e.g. that
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addition is associative) or may not work for all input ranges. These
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optimizations allow the code generator to make use of some instructions which
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would otherwise not be usable (such as fsin on X86).
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**--enable-correct-eh-support**
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Instruct the **lowerinvoke** pass to insert code for correct exception handling
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support. This is expensive and is by default omitted for efficiency.
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**--stats**
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Print statistics recorded by code-generation passes.
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**--time-passes**
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Record the amount of time needed for each pass and print a report to standard
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error.
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**--load**\ =\ *dso_path*
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Dynamically load *dso_path* (a path to a dynamically shared object) that
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implements an LLVM target. This will permit the target name to be used with the
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**-march** option so that code can be generated for that target.
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Tuning/Configuration Options
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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**--print-machineinstrs**
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Print generated machine code between compilation phases (useful for debugging).
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**--regalloc**\ =\ *allocator*
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Specify the register allocator to use. The default *allocator* is *local*.
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Valid register allocators are:
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*simple*
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Very simple "always spill" register allocator
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*local*
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Local register allocator
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*linearscan*
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Linear scan global register allocator
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*iterativescan*
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Iterative scan global register allocator
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**--spiller**\ =\ *spiller*
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Specify the spiller to use for register allocators that support it. Currently
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this option is used only by the linear scan register allocator. The default
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*spiller* is *local*. Valid spillers are:
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*simple*
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Simple spiller
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*local*
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Local spiller
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Intel IA-32-specific Options
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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**--x86-asm-syntax=att|intel**
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Specify whether to emit assembly code in AT&T syntax (the default) or intel
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syntax.
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EXIT STATUS
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-----------
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If **llc** succeeds, it will exit with 0. Otherwise, if an error occurs,
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it will exit with a non-zero value.
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SEE ALSO
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--------
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lli|lli
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