277 lines
6.9 KiB
Groff
277 lines
6.9 KiB
Groff
.\" $FreeBSD$
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.TH "LLC" "1" "2012-08-16" "3.2" "LLVM"
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.SH NAME
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llc \- LLVM static compiler
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.\" Man page generated from reStructuredText.
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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 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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.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 \fB\-march\fP option is used to override
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the default.
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.SH OPTIONS
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.sp
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If \fIfilename\fP is \- or omitted, \fBllc\fP reads from standard input. Otherwise, it
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will from \fIfilename\fP. 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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.sp
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If the \fB\-o\fP option is omitted, then \fBllc\fP will send its output to standard
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output if the input is from standard input. If the \fB\-o\fP option specifies \-,
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then the output will also be sent to standard output.
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.sp
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If no \fB\-o\fP option is specified and an input file other than \- is specified,
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then \fBllc\fP creates the output filename by taking the input filename,
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removing any existing \fI.bc\fP extension, and adding a \fI.s\fP suffix.
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.sp
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Other \fBllc\fP options are as follows:
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.SS End\-user Options
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.sp
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\fB\-help\fP
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.INDENT 0.0
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.INDENT 3.5
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Print a summary of command line options.
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.UNINDENT
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.UNINDENT
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.sp
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\fB\-O\fP=\fIuint\fP
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.INDENT 0.0
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.INDENT 3.5
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Generate code at different optimization levels. These correspond to the \fI\-O0\fP,
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\fI\-O1\fP, \fI\-O2\fP, and \fI\-O3\fP optimization levels used by \fBllvm\-gcc\fP and
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\fBclang\fP.
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.UNINDENT
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.UNINDENT
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.sp
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\fB\-mtriple\fP=\fItarget triple\fP
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.INDENT 0.0
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.INDENT 3.5
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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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.UNINDENT
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.sp
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\fB\-march\fP=\fIarch\fP
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.INDENT 0.0
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.INDENT 3.5
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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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.UNINDENT
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.sp
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\fB\-mcpu\fP=\fIcpuname\fP
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.INDENT 0.0
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.INDENT 3.5
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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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\fBllvm\-as < /dev/null | llc \-march=xyz \-mcpu=help\fP
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.UNINDENT
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.UNINDENT
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.sp
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\fB\-mattr\fP=\fIa1,+a2,\-a3,...\fP
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.INDENT 0.0
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.INDENT 3.5
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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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\fBllvm\-as < /dev/null | llc \-march=xyz \-mattr=help\fP
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.UNINDENT
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.UNINDENT
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.sp
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\fB\-\-disable\-fp\-elim\fP
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.INDENT 0.0
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.INDENT 3.5
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Disable frame pointer elimination optimization.
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.UNINDENT
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.UNINDENT
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.sp
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\fB\-\-disable\-excess\-fp\-precision\fP
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.INDENT 0.0
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.INDENT 3.5
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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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.UNINDENT
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.sp
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\fB\-\-enable\-no\-infs\-fp\-math\fP
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.INDENT 0.0
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.INDENT 3.5
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Enable optimizations that assume no Inf values.
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.UNINDENT
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.UNINDENT
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.sp
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\fB\-\-enable\-no\-nans\-fp\-math\fP
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.INDENT 0.0
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.INDENT 3.5
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Enable optimizations that assume no NAN values.
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.UNINDENT
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.UNINDENT
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.sp
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\fB\-\-enable\-unsafe\-fp\-math\fP
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.INDENT 0.0
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.INDENT 3.5
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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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.UNINDENT
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.UNINDENT
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.sp
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\fB\-\-enable\-correct\-eh\-support\fP
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.INDENT 0.0
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.INDENT 3.5
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Instruct the \fBlowerinvoke\fP 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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.UNINDENT
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.UNINDENT
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.sp
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\fB\-\-stats\fP
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.INDENT 0.0
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.INDENT 3.5
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Print statistics recorded by code\-generation passes.
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.UNINDENT
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.UNINDENT
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.sp
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\fB\-\-time\-passes\fP
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.INDENT 0.0
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.INDENT 3.5
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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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.UNINDENT
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.sp
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\fB\-\-load\fP=\fIdso_path\fP
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.INDENT 0.0
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.INDENT 3.5
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Dynamically load \fIdso_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 the
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\fB\-march\fP option so that code can be generated for that target.
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.UNINDENT
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.UNINDENT
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.SS Tuning/Configuration Options
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.sp
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\fB\-\-print\-machineinstrs\fP
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.INDENT 0.0
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.INDENT 3.5
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Print generated machine code between compilation phases (useful for debugging).
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.UNINDENT
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.UNINDENT
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.sp
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\fB\-\-regalloc\fP=\fIallocator\fP
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.INDENT 0.0
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.INDENT 3.5
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Specify the register allocator to use. The default \fIallocator\fP is \fIlocal\fP.
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Valid register allocators are:
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.sp
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\fIsimple\fP
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.INDENT 0.0
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.INDENT 3.5
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Very simple "always spill" register allocator
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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 0.0
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.INDENT 3.5
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Local register allocator
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.UNINDENT
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.UNINDENT
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.sp
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\fIlinearscan\fP
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.INDENT 0.0
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.INDENT 3.5
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Linear scan global register allocator
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.UNINDENT
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.UNINDENT
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.sp
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\fIiterativescan\fP
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.INDENT 0.0
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.INDENT 3.5
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Iterative scan global register allocator
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.sp
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\fB\-\-spiller\fP=\fIspiller\fP
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.INDENT 0.0
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.INDENT 3.5
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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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\fIspiller\fP is \fIlocal\fP. Valid spillers are:
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.sp
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\fIsimple\fP
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.INDENT 0.0
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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 0.0
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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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.UNINDENT
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.SS Intel IA\-32\-specific Options
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.sp
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\fB\-\-x86\-asm\-syntax=att|intel\fP
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.INDENT 0.0
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.INDENT 3.5
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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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.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 occurs,
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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|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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2012, LLVM Project
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.\" Generated by docutils manpage writer.
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