forked from OSchip/llvm-project
77 lines
1.6 KiB
Plaintext
77 lines
1.6 KiB
Plaintext
=pod
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=head1 NAME
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gccas - optimizing LLVM assembler
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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> utility takes an LLVM assembly file generated by the
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L<llvmgcc|llvmgcc> or L<llvmg++|llvmgxx> front-ends and converts
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it into an LLVM bytecode file. It is primarily used by the GCC
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front end, and as such, attempts to mimic the interface provided
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by the default system assembler so that it can act as a "drop-in"
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replacement.
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B<gccas> performs a number of optimizations on the input program,
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including but not limited to: promotion of stack values to SSA
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registers; elimination of dead globals, function arguments, code,
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and types; tail-call elimination; loop-invariant code motion; global
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common-subexpression elimination; and sparse conditional constant
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propagation.
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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<--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<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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