260 lines
6.8 KiB
Groff
260 lines
6.8 KiB
Groff
.\" $FreeBSD$
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.\" Man page generated from reStructuredText.
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.TH "LLC" "1" "2015-05-30" "3.7" "LLVM"
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.SH NAME
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llc \- LLVM static compiler
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..
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.SH SYNOPSIS
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.sp
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\fBllc\fP [\fIoptions\fP] [\fIfilename\fP]
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.SH DESCRIPTION
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.sp
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The \fBllc\fP command compiles LLVM source inputs into assembly language
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for a specified architecture. The assembly language output can then be passed
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through a native assembler and linker to generate a native executable.
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.sp
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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 \fI\%\-march\fP option is used to
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override the default.
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.SH OPTIONS
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.sp
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If \fBfilename\fP is "\fB\-\fP" or omitted, \fBllc\fP reads from standard input.
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Otherwise, it will from \fBfilename\fP\&. Inputs can be in either the LLVM assembly
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language format (\fB\&.ll\fP) or the LLVM bitcode format (\fB\&.bc\fP).
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.sp
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If the \fI\-o\fP option is omitted, then \fBllc\fP will send its output
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to standard output if the input is from standard input. If the \fI\-o\fP
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option specifies "\fB\-\fP", then the output will also be sent to standard output.
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.sp
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If no \fI\-o\fP option is specified and an input file other than "\fB\-\fP" is
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specified, then \fBllc\fP creates the output filename by taking the input
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filename, removing any existing \fB\&.bc\fP extension, and adding a \fB\&.s\fP suffix.
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.sp
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Other \fBllc\fP options are described below.
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.SS End\-user Options
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.INDENT 0.0
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.TP
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.B \-help
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Print a summary of command line options.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-O=uint
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Generate code at different optimization levels. These correspond to the
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\fB\-O0\fP, \fB\-O1\fP, \fB\-O2\fP, and \fB\-O3\fP optimization levels used by
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\fBclang\fP\&.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-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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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-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 \fBllc \-help\fP 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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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-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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.INDENT 7.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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llvm\-as < /dev/null | llc \-march=xyz \-mcpu=help
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-filetype=<output file type>
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Specify what kind of output \fBllc\fP should generated. Options are: \fBasm\fP
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for textual assembly ( \fB\(aq.s\(aq\fP), \fBobj\fP for native object files (\fB\(aq.o\(aq\fP)
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and \fBnull\fP for not emitting anything (for performance testing).
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.sp
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Note that not all targets support all options.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-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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.INDENT 7.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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llvm\-as < /dev/null | llc \-march=xyz \-mattr=help
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-disable\-fp\-elim
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Disable frame pointer elimination optimization.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-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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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-enable\-no\-infs\-fp\-math
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Enable optimizations that assume no Inf values.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-enable\-no\-nans\-fp\-math
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Enable optimizations that assume no NAN values.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-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 \fBfsin\fP on X86).
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-stats
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Print statistics recorded by code\-generation passes.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-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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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-load=<dso_path>
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Dynamically load \fBdso_path\fP (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
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the \fI\%\-march\fP option so that code can be generated for that target.
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.UNINDENT
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.SS Tuning/Configuration Options
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.INDENT 0.0
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.TP
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.B \-\-print\-machineinstrs
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Print generated machine code between compilation phases (useful for debugging).
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-regalloc=<allocator>
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Specify the register allocator to use.
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Valid register allocators are:
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.sp
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\fIbasic\fP
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.INDENT 7.0
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.INDENT 3.5
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Basic register allocator.
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.UNINDENT
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.UNINDENT
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.sp
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\fIfast\fP
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.INDENT 7.0
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.INDENT 3.5
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Fast register allocator. It is the default for unoptimized code.
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.UNINDENT
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.UNINDENT
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.sp
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\fIgreedy\fP
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.INDENT 7.0
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.INDENT 3.5
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Greedy register allocator. It is the default for optimized code.
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.UNINDENT
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.UNINDENT
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.sp
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\fIpbqp\fP
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.INDENT 7.0
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.INDENT 3.5
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Register allocator based on \(aqPartitioned Boolean Quadratic Programming\(aq.
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-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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\fBspiller\fP is \fIlocal\fP\&. Valid spillers are:
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.sp
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\fIsimple\fP
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.INDENT 7.0
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.INDENT 3.5
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Simple spiller
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.UNINDENT
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.UNINDENT
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.sp
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\fIlocal\fP
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.INDENT 7.0
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.INDENT 3.5
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Local spiller
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.SS Intel IA\-32\-specific Options
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.INDENT 0.0
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.TP
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.B \-\-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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.UNINDENT
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.SH EXIT STATUS
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.sp
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If \fBllc\fP succeeds, it will exit with 0. Otherwise, if an error
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occurs, it will exit with a non\-zero value.
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.SH SEE ALSO
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.sp
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lli
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.SH AUTHOR
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Maintained by The LLVM Team (http://llvm.org/).
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.SH COPYRIGHT
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2003-2014, LLVM Project
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.\" Generated by docutils manpage writer.
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