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<title>LLVM: llc tool</title>
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2003-09-12 15:46:24 +00:00
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2003-10-07 20:12:05 +00:00
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<center><h1>LLVM: <tt>llc</tt> tool</h1></center>
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2003-09-12 15:46:24 +00:00
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<HR>
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<h3>NAME</h3>
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<tt>llc</tt>
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<h3>SYNOPSIS</h3>
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<tt>llc [options] [filename]</tt>
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<h3>DESCRIPTION</h3>
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The <tt>llc</tt> command compiles LLVM bytecode 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 native code.
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<p>
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The choice of architecture for the output assembly code is determined as
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follows:
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<ul>
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<li>
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If the user has specified an architecture with the -m option, use that
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architecture.
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<p>
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<li>
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Examine the input LLVM bytecode file:
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<ul>
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<li>
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If it specifies little endian and a pointer size of 32 bits, select the
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x86 architecture.
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<p>
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<li>
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If it specifies big endian and a pointer size of 64 bit pointers,
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select the SparcV9 architecture.
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</ul>
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<p>
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<li>
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If <tt>llc</tt> was compiled on an architecture for which it can
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generate code, select the architecture upon which <tt>llc</tt> was
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compiled.
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<p>
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<li>
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Print a message to the user asking him or her to specify the output
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architecture explicitly.
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</ul>
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<p>
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If filename is not specified, or if filename is -, <tt>llc</tt> reads its input
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from standard input. Otherwise, it will read its input from filename.
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<p>
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If the -o option is left unspecified, then <tt>llc</tt> will send its output to standard
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output if the input is from standard input. If the -o option specifies -, then
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the output will also be sent to standard output.
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<p>
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If no -o option is specified and an input file other than - is specified, then
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<tt>llc</tt> creates the output filename as follows:
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<ul>
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<li>
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If the file ends in .bc, then the .bc suffix is removed, and the .s suffix
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is appended.
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<p>
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<li>
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Otherwise, the .s suffix is appended to the input filename.
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</ul>
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<h3>
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OPTIONS
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</h3>
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<ul>
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<li>-f
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<br>
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Overwrite output files
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<p>
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<li>-m<arch>
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<br>
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Specify the architecture for which to generate assembly. Valid
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architectures are:
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<dl compact>
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<dt> x86 </dt>
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<dd>IA-32 (Pentium and above)</dd>
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<dt> sparcv9 </dt>
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<dd>SPARC V9</dd>
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<dt> c </dt>
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<dd>Emit C code</dd>
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</dl>
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<p>
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<li>-o <filename>
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<br>
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Specify the output filename.
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<p>
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<li>-enable-correct-eh-support
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<br>
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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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<p>
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<li> -help
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<br>
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Print a summary of command line options.
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<p>
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<li> -stats
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<br>
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Print statistics.
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<p>
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<li> -time-passes
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<br>
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Record the amount of time needed for each pass and print it to standard
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error.
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<p>
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</ul>
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<h4>X86 Specific Options</h4>
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<ul>
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<li>-disable-fp-elim
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<br>
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Disable frame pointer elimination optimization.
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<p>
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<li>-disable-pattern-isel
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<br>
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Use the 'simple' X86 instruction selector (the default).
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<p>
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<li>-print-machineinstrs
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<br>
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Print generated machine code.
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<p>
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2003-10-02 06:13:19 +00:00
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<li>-regalloc=<ra>
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<br>
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Specify the register allocator to use. The default is <i>local</i>.
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Valid register allocators are:
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<p>
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<dl compact>
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<dt> simple </dt>
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<dd>Very simple register allocator</dd>
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<dt> local </dt>
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<dd>Local register allocator</dd>
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<dt> linearscan </dt>
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<dd>Linear scan global register allocator (experimental)</dd>
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</dl>
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<li>-spiller=<sp>
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<br>
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Specify the spiller to use for register allocators that support it.
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Currently this option is used by the linear scan register
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allocator. The default is <i>local</i>.
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Valid spillers are:
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<p>
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<dl compact>
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<dt> simple </dt>
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<dd>Simple spiller</dd>
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<dt> local </dt>
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<dd>Local spiller</dd>
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</dl>
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</ul>
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<h4>Sparc Specific Options</h4>
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<ul>
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<li>-disable-peephole
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<br>
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Disable peephole optimization pass.
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<p>
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<li>-disable-sched
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<br>
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Disable local scheduling pass.
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<p>
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<li>-disable-strip
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<br>
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Do not strip the LLVM bytecode included in executable.
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<p>
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<li>-enable-maps
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<br>
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Emit LLVM-to-MachineCode mapping info to assembly.
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<p>
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</ul>
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<h3>EXIT STATUS</h3>
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If <tt>llc</tt> 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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<h3>
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SEE ALSO
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</h3>
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<a href="lli.html"><tt>lli</tt></a>
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<HR>
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Maintained by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a>.
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</body>
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</html>
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