| Brian Gaeke | f36e2d5 | 2004-06-02 19:12:38 +0000 | [diff] [blame] | 1 | =pod |
| 2 | |
| 3 | =head1 NAME |
| 4 | |
| 5 | gccas - optimizing LLVM assembler |
| 6 | |
| 7 | =head1 SYNOPSIS |
| 8 | |
| Misha Brukman | c08937a | 2004-07-02 16:06:19 +0000 | [diff] [blame] | 9 | B<gccas> [I<options>] I<filename> |
| Brian Gaeke | f36e2d5 | 2004-06-02 19:12:38 +0000 | [diff] [blame] | 10 | |
| 11 | =head1 DESCRIPTION |
| 12 | |
| 13 | The B<gccas> utility takes an LLVM assembly file generated by the |
| Misha Brukman | 6aa3c74 | 2004-07-01 17:59:53 +0000 | [diff] [blame] | 14 | L<llvmgcc|llvmgcc> or L<llvmg++|llvmgxx> front-ends and converts |
| Brian Gaeke | f36e2d5 | 2004-06-02 19:12:38 +0000 | [diff] [blame] | 15 | it into an LLVM bytecode file. It is primarily used by the GCC |
| 16 | front end, and as such, attempts to mimic the interface provided |
| 17 | by the default system assembler so that it can act as a "drop-in" |
| 18 | replacement. |
| 19 | |
| 20 | B<gccas> performs a number of optimizations on the input program, |
| 21 | including but not limited to: promotion of stack values to SSA |
| 22 | registers; elimination of dead globals, function arguments, code, |
| 23 | and types; tail-call elimination; loop-invariant code motion; global |
| 24 | common-subexpression elimination; and sparse conditional constant |
| 25 | propagation. |
| 26 | |
| 27 | =head1 OPTIONS |
| 28 | |
| 29 | =over |
| 30 | |
| 31 | =item B<--help> |
| 32 | |
| 33 | Print a summary of command line options. |
| 34 | |
| 35 | =item B<-o> F<filename> |
| 36 | |
| 37 | Specify the name of the output file which will hold the assembled bytecode. |
| 38 | |
| 39 | =item B<--disable-inlining> |
| 40 | |
| 41 | Disable the inlining pass. By default, it is enabled. |
| 42 | |
| 43 | =item B<--disable-opt> |
| 44 | |
| 45 | Disable all assembler-time optimization passes. |
| 46 | |
| Brian Gaeke | f36e2d5 | 2004-06-02 19:12:38 +0000 | [diff] [blame] | 47 | =item B<--stats> |
| 48 | |
| 49 | Print statistics. |
| 50 | |
| 51 | =item B<--time-passes> |
| 52 | |
| 53 | Record the amount of time needed for each pass and print it to standard |
| 54 | error. |
| 55 | |
| 56 | =item B<--verify> |
| 57 | |
| 58 | Verify each pass result. |
| 59 | |
| 60 | =back |
| 61 | |
| 62 | =head1 EXIT STATUS |
| 63 | |
| 64 | If B<gccas> succeeds, it will exit with an exit status of 0. |
| 65 | Otherwise, if an error occurs, it will exit with a non-zero exit |
| 66 | status. |
| 67 | |
| 68 | =head1 SEE ALSO |
| 69 | |
| Misha Brukman | c08937a | 2004-07-02 16:06:19 +0000 | [diff] [blame] | 70 | L<llvm-as|llvm-as>, L<gccld|gccld> |
| Brian Gaeke | f36e2d5 | 2004-06-02 19:12:38 +0000 | [diff] [blame] | 71 | |
| 72 | =head1 AUTHORS |
| 73 | |
| 74 | Maintained by the LLVM Team (L<http://llvm.cs.uiuc.edu>). |
| 75 | |
| 76 | =cut |