2.0 Release docsrelease_20

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+.rm #[ #] #H #V #F C
+.\" ========================================================================
+.\"
+.IX Title "LLC 1"
+.TH LLC 1 "2006-03-13" "CVS" "LLVM Command Guide"
+.SH "NAME"
+llc \- LLVM static compiler
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+\&\fBllc\fR [\fIoptions\fR] [\fIfilename\fR]
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+The \fBllc\fR command compiles \s-1LLVM\s0 bytecode 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.
+.PP
+The choice of architecture for the output assembly code is automatically
+determined from the input bytecode file, unless the \fB\-march\fR option is used to
+override the default.
+.SH "OPTIONS"
+.IX Header "OPTIONS"
+If \fIfilename\fR is \- or omitted, \fBllc\fR reads \s-1LLVM\s0 bytecode from standard input.
+Otherwise, it will read \s-1LLVM\s0 bytecode from \fIfilename\fR.
+.PP
+If the \fB\-o\fR option is omitted, then \fBllc\fR will send its output to standard
+output if the input is from standard input.  If the \fB\-o\fR option specifies \-,
+then the output will also be sent to standard output.
+.PP
+If no \fB\-o\fR option is specified and an input file other than \- is specified,
+then \fBllc\fR creates the output filename by taking the input filename,
+removing any existing \fI.bc\fR extension, and adding a \fI.s\fR suffix.
+.PP
+Other \fBllc\fR options are as follows:
+.Sh "End-user Options"
+.IX Subsection "End-user Options"
+.IP "\fB\-\-help\fR" 4
+.IX Item "--help"
+Print a summary of command line options.
+.IP "\fB\-f\fR" 4
+.IX Item "-f"
+Overwrite output files. By default, \fBllc\fR will refuse to overwrite
+an output file which already exists.
+.IP "\fB\-mtriple\fR=\fItarget triple\fR" 4
+.IX Item "-mtriple=target triple"
+Override the target triple specified in the input bytecode file with the 
+specified string.
+.IP "\fB\-march\fR=\fIarch\fR" 4
+.IX Item "-march=arch"
+Specify the architecture for which to generate assembly, overriding the target
+encoded in the bytecode file.  See the output of \fBllc \-\-help\fR for a list of
+valid architectures.  By default this is inferred from the target triple or
+autodetected to the current architecture.
+.IP "\fB\-mcpu\fR=\fIcpuname\fR" 4
+.IX Item "-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:
+\&\fBllvm-as < /dev/null | llc \-march=xyz \-mcpu=help\fR
+.IP "\fB\-mattr\fR=\fIa1,+a2,\-a3,...\fR" 4
+.IX Item "-mattr=a1,+a2,-a3,..."
+Override or control specific attributes of the target, such as whether \s-1SIMD\s0
+operations are enabled or not.  The default set of attributes is set by the
+current \s-1CPU\s0.  For a list of available attributes, use:
+\&\fBllvm-as < /dev/null | llc \-march=xyz \-mattr=help\fR
+.IP "\fB\-\-disable\-fp\-elim\fR" 4
+.IX Item "--disable-fp-elim"
+Disable frame pointer elimination optimization.
+.IP "\fB\-\-disable\-excess\-fp\-precision\fR" 4
+.IX Item "--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).
+.IP "\fB\-\-enable\-unsafe\-fp\-math\fR" 4
+.IX Item "--enable-unsafe-fp-math"
+Enable optimizations that make unsafe assumptions about \s-1IEEE\s0 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).
+.IP "\fB\-\-enable\-correct\-eh\-support\fR" 4
+.IX Item "--enable-correct-eh-support"
+Instruct the \fBlowerinvoke\fR pass to insert code for correct exception handling
+support.  This is expensive and is by default omitted for efficiency.
+.IP "\fB\-\-stats\fR" 4
+.IX Item "--stats"
+Print statistics recorded by code-generation passes.
+.IP "\fB\-\-time\-passes\fR" 4
+.IX Item "--time-passes"
+Record the amount of time needed for each pass and print a report to standard
+error.
+.IP "\fB\-\-load\fR=\fIdso_path\fR" 4
+.IX Item "--load=dso_path"
+Dynamically load \fIdso_path\fR (a path to a dynamically shared object) that
+implements an \s-1LLVM\s0 target. This will permit the target name to be used with the
+\&\fB\-march\fR option so that code can be generated for that target.
+.Sh "Tuning/Configuration Options"
+.IX Subsection "Tuning/Configuration Options"
+.IP "\fB\-\-print\-machineinstrs\fR" 4
+.IX Item "--print-machineinstrs"
+Print generated machine code between compilation phases (useful for debugging).
+.IP "\fB\-\-regalloc\fR=\fIallocator\fR" 4
+.IX Item "--regalloc=allocator"
+Specify the register allocator to use. The default \fIallocator\fR is \fIlocal\fR.
+Valid register allocators are:
+.RS 4
+.IP "\fIsimple\fR" 4
+.IX Item "simple"
+Very simple \*(L"always spill\*(R" register allocator
+.IP "\fIlocal\fR" 4
+.IX Item "local"
+Local register allocator
+.IP "\fIlinearscan\fR" 4
+.IX Item "linearscan"
+Linear scan global register allocator
+.IP "\fIiterativescan\fR" 4
+.IX Item "iterativescan"
+Iterative scan global register allocator
+.RE
+.RS 4
+.RE
+.IP "\fB\-\-spiller\fR=\fIspiller\fR" 4
+.IX Item "--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
+\&\fIspiller\fR is \fIlocal\fR.  Valid spillers are:
+.RS 4
+.IP "\fIsimple\fR" 4
+.IX Item "simple"
+Simple spiller
+.IP "\fIlocal\fR" 4
+.IX Item "local"
+Local spiller
+.RE
+.RS 4
+.RE
+.Sh "Intel IA\-32\-specific Options"
+.IX Subsection "Intel IA-32-specific Options"
+.IP "\fB\-\-x86\-asm\-syntax=att|intel\fR" 4
+.IX Item "--x86-asm-syntax=att|intel"
+Specify whether to emit assembly code in \s-1AT&T\s0 syntax (the default) or intel
+syntax.
+.SH "EXIT STATUS"
+.IX Header "EXIT STATUS"
+If \fBllc\fR succeeds, it will exit with 0.  Otherwise, if an error occurs,
+it will exit with a non-zero value.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+lli
+.SH "AUTHORS"
+.IX Header "AUTHORS"
+Maintained by the \s-1LLVM\s0 Team (<http://llvm.org>).