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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21965 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2005-05-13 20:01:11 +00:00
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74
docs/CommandGuide/llc.pod
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@ -12,11 +12,11 @@ B<llc> [I<options>] [I<filename>]
The B<llc> command compiles LLVM bytecode into assembly language for a
specified architecture. The assembly language output can then be passed through
a native assembler and linker to generate native code.
a native assembler and linker to generate a native executable.
The choice of architecture for the output assembly code is automatically
determined from the input bytecode file, unless a B<-m> option is used to override
the default.
The choice of architecture for the output assembly code is automatically
determined from the input bytecode file, unless the B<-march> option is used to
override the default.
=head1 OPTIONS
@ -33,8 +33,14 @@ removing any existing F<.bc> extension, and adding a F<.s> suffix.
Other B<llc> options are as follows:
=head2 End-user Options
=over
=item B<--help>
Print a summary of command line options.
=item B<-f>
Overwrite output files. By default, B<llc> will refuse to overwrite
@ -42,42 +48,32 @@ an output file which already exists.
=item B<-march>=I<arch>
Specify the architecture for which to generate assembly. Valid
architectures are:
=over
=item I<x86>
Intel IA-32 (Pentium and above)
=item I<ppc32>
32-bit PowerPC (MacOS X, 32-bit ABI)
=item I<sparcv9>
64-bit SPARC V9
=item I<c>
Emit C code, not assembly
=back
Specify the architecture for which to generate assembly, overriding the target
encoded in the bytecode file. See the output of B<llc --help> for a list of
valid architectures.
=item B<--disable-fp-elim>
Disable frame pointer elimination optimization.
=item 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).
=item 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 fsin on X86).
=item B<--enable-correct-eh-support>
Instruct the B<lowerinvoke> pass to insert code for correct exception handling
support. This is expensive and is by default omitted for efficiency.
=item B<--help>
Print a summary of command line options.
=item B<--stats>
Print statistics recorded by code-generation passes.
@ -87,6 +83,18 @@ Print statistics recorded by code-generation passes.
Record the amount of time needed for each pass and print a report to standard
error.
=item B<--load>=F<dso_path>
Dynamically load F<dso_path> (a path to a dynamically shared object) that
implements an LLVM target. This will permit the target name to be used with the
B<-march> option so that code can be generated for that target.
=back
=head2 Tuning/Configuration Options
=over
=item B<--print-machineinstrs>
Print generated machine code between compilation phases (useful for debugging).
@ -134,12 +142,6 @@ Local spiller
=back
=item B<--load>=F<dso_path>
Dynamically load F<dso_path> (a path to a dynamically shared object) that
implements an LLVM target. This will permit the target name to be used with the
B<-march> option so that code can be generated for that target.
=back
=head2 Intel IA-32-specific Options