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205 lines
4.0 KiB
Plaintext
205 lines
4.0 KiB
Plaintext
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=pod
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=head1 NAME
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llc - LLVM static compiler
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=head1 SYNOPSIS
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llc [options] [filename]
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=head1 DESCRIPTION
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The B<llc> 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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The choice of architecture for the output assembly code is determined as
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follows, by attempting to satisfy each of the following rules in turn (first
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one wins):
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=over
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=item *
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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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=item *
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Examine the input LLVM bytecode file: if it is little endian and has a
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pointer size of 32 bits, select the Intel IA-32 architecture. If it is big
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endian and has a pointer size of 64 bits, select the SparcV9 architecture.
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=item *
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If B<llc> was compiled on an architecture for which it can generate code, select
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the architecture upon which B<llc> was compiled.
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=item *
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Exit with an error message telling the user to specify the output
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architecture explicitly.
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=back
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=head1 OPTIONS
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If I<filename> is - or omitted, B<llc> reads LLVM bytecode from standard input.
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Otherwise, it will read LLVM bytecode from I<filename>.
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If the B<-o> option is omitted, then B<llc> will send its output to standard
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output if the input is from standard input. If the B<-o> option specifies -,
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then the output will also be sent to standard output.
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If no B<-o> option is specified and an input file other than - is specified,
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then B<llc> creates the output filename by taking the input filename,
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removing any existing F<.bc> extension, and adding a F<.s> suffix.
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Other B<llc> options are as follows:
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=over
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=item B<-f>
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Overwrite output files. By default, B<llc> will refuse to overwrite
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an output file which already exists.
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=item B<-march>=I<arch>
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Specify the architecture for which to generate assembly. Valid
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architectures are:
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=over
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=item I<x86>
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Intel IA-32 (Pentium and above)
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=item I<sparcv9>
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64-bit SPARC V9
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=item I<c>
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Emit C code, not assembly
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=back
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=item B<-enable-correct-eh-support>
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Instruct the B<-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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=item B<-help>
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Print a summary of command line options.
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=item B<-stats>
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Print statistics recorded by code-generation passes.
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=item 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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=back
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=head2 Intel IA-32-specific Options
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=over
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=item B<--disable-fp-elim>
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Disable frame pointer elimination optimization.
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=item B<--disable-pattern-isel>
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Use the 'simple' X86 instruction selector (the default).
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=item B<--print-machineinstrs>
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Print generated machine code.
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=item B<--regalloc>=I<allocator>
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Specify the register allocator to use. The default I<allocator> is I<local>.
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Valid register allocators are:
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=over
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=item I<simple>
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Very simple "always spill" register allocator
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=item I<local>
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Local register allocator
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=item I<linearscan>
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Linear scan global register allocator (experimental)
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=back
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=item B<--spiller>=I<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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I<spiller> is I<local>. Valid spillers are:
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=over
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=item I<simple>
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Simple spiller
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=item I<local>
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Local spiller
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=back
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=back
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=head2 SPARCV9-specific Options
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=over
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=item B<--disable-peephole>
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Disable peephole optimization pass.
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=item B<--disable-sched>
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Disable local scheduling pass.
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=item B<--disable-strip>
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The Sparc backend embeds the LLVM bytecode into the assembly output. This
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option requests that symbol names be retained; by default, they are stripped out.
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=item B<--enable-maps>
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Emit LLVM-to-machine code mapping information into the assembly output.
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=back
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=head1 EXIT STATUS
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If B<llc> 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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=head1 SEE ALSO
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L<lli>
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=head1 AUTHORS
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Maintained by the LLVM Team (L<http://llvm.cs.uiuc.edu>).
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=cut
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