abcd pod document

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14543 91177308-0d34-0410-b5e6-96231b3b80d8

docs/CommandGuide/llvm-abcd.pod

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+=pod
+
+=head1 NAME
+
+llvm-abcd - bytecode file low-level dumper
+
+=head1 SYNOPSIS
+
+llvm-abcd [options] [filename]
+
+=head1 DESCRIPTION
+
+The B<llvm-abcd> command is a small utility for analyzing bytecode files. The
+B<abcd> acronym stands for B<a>nalysis of B<b>yteB<c>ode B<d>isplayer. The tool
+reads a bytecode file (such as generated with the B<llvm-as> tool) and produces
+statistical and low level bytecode format dumps. This tool is probably not of
+much interest or utility except for those working directly with the bytecode
+format. Most LLVM users can just ignore this tool.
+
+If filename is omitted or is I<->, then B<llvm-abcd> reads its input from 
+standard input. This is useful for combining B<llvm-abcd> in a pipeline.
+
+=head1 OPTIONS
+
+=over
+
+=item B<--nodetails>
+
+Causes B<llvm-abcd> to abbreviate its output by writing out only a module level
+summary. The details for individual functions are not displayed.
+
+=item B<--dump>
+
+Causes B<llvm-abcd> to dump the bytecode in a human readable format. This format
+is significantly different from LLVM assembly and provides details about the
+encoding of the bytecode file.
+
+=item B<--verify>
+
+Causes B<llvm-abcd> to verify the module produced by by reading the bytecode.
+This ensures that the statistics generated are reliable.
+
+=item B<--help>
+
+Print a summary of command line options. 
+
+=back
+
+=head1 EXIT STATUS
+
+If B<llvm-abcd> succeeds, it will exit with zero exit status.  Otherwise, if an
+error occurs, it will exit with a non-zero exit status, usually 1.
+
+=head1 SEE ALSO
+
+L<llvm-dis>, L<LLVM Bytecode File Format|../docs/BytecodeFormat.html>
+
+=head1 AUTHOR
+
+Maintained by L<rspencer@x10sys.com|Reid Spencer>. 
+
+=cut
+