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776b16d075
Update documentation to reflect that this isn't a full-blown executable any more. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33807 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
1.8 KiB
Plaintext
81 lines
1.8 KiB
Plaintext
=pod
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=head1 NAME
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gccas - convenience script to run B<llvm-as> and B<opt>
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=head1 SYNOPSIS
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B<gccas> [I<options>] I<filename>
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=head1 DESCRIPTION
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The B<gccas> shell script passes an LLVM assembly file through the B<llvm-as>
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and B<opt> programs to generate an optimized bytecode file. Its name is an
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historical artifact from when it was a full executable used to process LLVM
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assembly generated by the L<llvmgcc|llvmgcc> or L<llvmg++|llvmgxx> front-ends.
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Currently this is a shell script that simulates what the old B<gccas> executable
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once did.
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B<gccas> performs a number of optimizations on the input program, including but
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not limited to: promotion of stack values to SSA registers; elimination of dead
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globals, function arguments, code, and types; tail-call elimination;
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loop-invariant code motion; global common-subexpression elimination; and
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sparse conditional constant propagation. It accomplishes this by using the
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B<-std-compile-opts> option to the B<opt> tool.
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=head1 OPTIONS
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=over
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=item B<--help>
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Print a summary of command line options.
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=item B<-o> F<filename>
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Specify the name of the output file which will hold the assembled bytecode.
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=item B<--disable-inlining>
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Disable the inlining pass. By default, it is enabled.
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=item B<--disable-opt>
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Disable all assembler-time optimization passes.
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=item B<-disable-compression>
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Do not compress the generated bytecode.
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=item B<--stats>
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Print statistics.
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=item B<--time-passes>
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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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=item B<--verify>
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Verify each pass result.
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=back
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=head1 EXIT STATUS
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If B<gccas> succeeds, it will exit with an exit status of 0.
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Otherwise, if an error occurs, it will exit with a non-zero exit
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status.
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=head1 SEE ALSO
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L<llvm-as|llvm-as>, L<opt|opt>, L<gccld|gccld>
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=head1 AUTHORS
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Maintained by the LLVM Team (L<http://llvm.org>).
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=cut
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