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=pod
=head1 NAME
gccas - convenience script to run B<llvm-as> and B<opt>
=head1 SYNOPSIS
B<gccas> [I<options>] I<filename>
=head1 DESCRIPTION
The B<gccas> shell script passes an LLVM assembly file through the B<llvm-as>
and B<opt> programs to generate an optimized bytecode file. Its name is an
historical artifact from when it was a full executable used to process LLVM
assembly generated by the L<llvmgcc|llvmgcc> or L<llvmg++|llvmgxx> front-ends.
Currently this is a shell script that simulates what the old B<gccas> executable
once did.
B<gccas> performs a number of optimizations on the input program, including but
not limited to: promotion of stack values to SSA registers; elimination of dead
globals, function arguments, code, and types; tail-call elimination;
loop-invariant code motion; global common-subexpression elimination; and
sparse conditional constant propagation. It accomplishes this by using the
B<-std-compile-opts> option to the B<opt> tool.
=head1 OPTIONS
=over
=item B<--help>
Print a summary of command line options.
=item B<-o> F<filename>
Specify the name of the output file which will hold the assembled bytecode.
=item B<--disable-inlining>
Disable the inlining pass. By default, it is enabled.
=item B<--disable-opt>
Disable all assembler-time optimization passes.
=item B<-disable-compression>
Do not compress the generated bytecode.
=item B<--stats>
Print statistics.
=item B<--time-passes>
Record the amount of time needed for each pass and print it to standard
error.
=item B<--verify>
Verify each pass result.
=back
=head1 EXIT STATUS
If B<gccas> succeeds, it will exit with an exit status of 0.
Otherwise, if an error occurs, it will exit with a non-zero exit
status.
=head1 SEE ALSO
L<llvm-as|llvm-as>, L<opt|opt>, L<gccld|gccld>
=head1 AUTHORS
Maintained by the LLVM Team (L<http://llvm.org>).
=cut
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