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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:43 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:43 -0400
commitac5e55f5f2af5b92794c2aded46c6bae85b5f5ed (patch)
tree9367490586c84cba28652e443e3166d66c33b0d9 /static/freebsd/man1/llc.1
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+..
+.TH "LLC" "1" "2023-05-24" "16" "LLVM"
+.SH NAME
+llc \- LLVM static compiler
+.SH SYNOPSIS
+.sp
+\fBllc\fP [\fIoptions\fP] [\fIfilename\fP]
+.SH DESCRIPTION
+.sp
+The \fBllc\fP 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.
+.sp
+The choice of architecture for the output assembly code is automatically
+determined from the input file, unless the \fI\%\-march\fP option is used to
+override the default.
+.SH OPTIONS
+.sp
+If \fBfilename\fP is \(dq\fB\-\fP\(dq or omitted, \fBllc\fP reads from standard input.
+Otherwise, it will read from \fBfilename\fP\&. Inputs can be in either the LLVM
+assembly language format (\fB\&.ll\fP) or the LLVM bitcode format (\fB\&.bc\fP).
+.sp
+If the \fI\%\-o\fP option is omitted, then \fBllc\fP will send its output
+to standard output if the input is from standard input. If the \fI\%\-o\fP
+option specifies \(dq\fB\-\fP\(dq, then the output will also be sent to standard output.
+.sp
+If no \fI\%\-o\fP option is specified and an input file other than \(dq\fB\-\fP\(dq is
+specified, then \fBllc\fP creates the output filename by taking the input
+filename, removing any existing \fB\&.bc\fP extension, and adding a \fB\&.s\fP suffix.
+.sp
+Other \fBllc\fP options are described below.
+.SS End\-user Options
+.INDENT 0.0
+.TP
+.B \-help
+Print a summary of command line options.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-o <filename>
+Use \fB<filename>\fP as the output filename. See the summary above for more
+details.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-O=uint
+Generate code at different optimization levels. These correspond to the
+\fB\-O0\fP, \fB\-O1\fP, \fB\-O2\fP, and \fB\-O3\fP optimization levels used by
+\fBclang\fP\&.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-mtriple=<target triple>
+Override the target triple specified in the input file with the specified
+string.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-march=<arch>
+Specify the architecture for which to generate assembly, overriding the target
+encoded in the input file. See the output of \fBllc \-help\fP for a list of
+valid architectures. By default this is inferred from the target triple or
+autodetected to the current architecture.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-mcpu=<cpuname>
+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:
+.INDENT 7.0
+.INDENT 3.5
+.sp
+.nf
+.ft C
+llvm\-as < /dev/null | llc \-march=xyz \-mcpu=help
+.ft P
+.fi
+.UNINDENT
+.UNINDENT
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-filetype=<output file type>
+Specify what kind of output \fBllc\fP should generated. Options are: \fBasm\fP
+for textual assembly ( \fB\(aq.s\(aq\fP), \fBobj\fP for native object files (\fB\(aq.o\(aq\fP)
+and \fBnull\fP for not emitting anything (for performance testing).
+.sp
+Note that not all targets support all options.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-mattr=a1,+a2,\-a3,...
+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:
+.INDENT 7.0
+.INDENT 3.5
+.sp
+.nf
+.ft C
+llvm\-as < /dev/null | llc \-march=xyz \-mattr=help
+.ft P
+.fi
+.UNINDENT
+.UNINDENT
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-frame\-pointer
+Specify effect of frame pointer elimination optimization (all,non\-leaf,none).
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-disable\-excess\-fp\-precision
+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).
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-enable\-no\-infs\-fp\-math
+Enable optimizations that assume no Inf values.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-enable\-no\-nans\-fp\-math
+Enable optimizations that assume no NAN values.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-enable\-no\-signed\-zeros\-fp\-math
+Enable FP math optimizations that assume the sign of 0 is insignificant.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-enable\-no\-trapping\-fp\-math
+Enable setting the FP exceptions build attribute not to use exceptions.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-enable\-unsafe\-fp\-math
+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 \fBfsin\fP on X86).
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-stats
+Print statistics recorded by code\-generation passes.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-time\-passes
+Record the amount of time needed for each pass and print a report to standard
+error.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-load=<dso_path>
+Dynamically load \fBdso_path\fP (a path to a dynamically shared object) that
+implements an LLVM target. This will permit the target name to be used with
+the \fI\%\-march\fP option so that code can be generated for that target.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-meabi=[default|gnu|4|5]
+Specify which EABI version should conform to. Valid EABI versions are \fIgnu\fP,
+\fI4\fP and \fI5\fP\&. Default value (\fIdefault\fP) depends on the triple.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-stack\-size\-section
+Emit the .stack_sizes section which contains stack size metadata. The section
+contains an array of pairs of function symbol values (pointer size) and stack
+sizes (unsigned LEB128). The stack size values only include the space allocated
+in the function prologue. Functions with dynamic stack allocations are not
+included.
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-remarks\-section
+Emit the __remarks (MachO) section which contains metadata about remark
+diagnostics.
+.UNINDENT
+.SS Tuning/Configuration Options
+.INDENT 0.0
+.TP
+.B \-\-print\-after\-isel
+Print generated machine code after instruction selection (useful for debugging).
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-regalloc=<allocator>
+Specify the register allocator to use.
+Valid register allocators are:
+.sp
+\fIbasic\fP
+.INDENT 7.0
+.INDENT 3.5
+Basic register allocator.
+.UNINDENT
+.UNINDENT
+.sp
+\fIfast\fP
+.INDENT 7.0
+.INDENT 3.5
+Fast register allocator. It is the default for unoptimized code.
+.UNINDENT
+.UNINDENT
+.sp
+\fIgreedy\fP
+.INDENT 7.0
+.INDENT 3.5
+Greedy register allocator. It is the default for optimized code.
+.UNINDENT
+.UNINDENT
+.sp
+\fIpbqp\fP
+.INDENT 7.0
+.INDENT 3.5
+Register allocator based on \(aqPartitioned Boolean Quadratic Programming\(aq.
+.UNINDENT
+.UNINDENT
+.UNINDENT
+.INDENT 0.0
+.TP
+.B \-\-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
+\fBspiller\fP is \fIlocal\fP\&. Valid spillers are:
+.sp
+\fIsimple\fP
+.INDENT 7.0
+.INDENT 3.5
+Simple spiller
+.UNINDENT
+.UNINDENT
+.sp
+\fIlocal\fP
+.INDENT 7.0
+.INDENT 3.5
+Local spiller
+.UNINDENT
+.UNINDENT
+.UNINDENT
+.SS Intel IA\-32\-specific Options
+.INDENT 0.0
+.TP
+.B \-\-x86\-asm\-syntax=[att|intel]
+Specify whether to emit assembly code in AT&T syntax (the default) or Intel
+syntax.
+.UNINDENT
+.SH EXIT STATUS
+.sp
+If \fBllc\fP succeeds, it will exit with 0. Otherwise, if an error
+occurs, it will exit with a non\-zero value.
+.SH SEE ALSO
+.sp
+\fBlli(1)\fP
+.SH AUTHOR
+Maintained by the LLVM Team (https://llvm.org/).
+.SH COPYRIGHT
+2003-2023, LLVM Project
+.\" Generated by docutils manpage writer.
+.