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| author | Reid Spencer <rspencer@reidspencer.com> | 2007-02-03 00:44:47 +0000 |
|---|---|---|
| committer | Reid Spencer <rspencer@reidspencer.com> | 2007-02-03 00:44:47 +0000 |
| commit | 776b16d07514be6bd322c82a23cd527c183af9f9 (patch) | |
| tree | 904645e9e375ec59fb83d9aadf65475c8053b69b /docs | |
| parent | 5efdecc030f1a71cdb5b49d97c6c1c45e68ff731 (diff) | |
| download | external_llvm-776b16d07514be6bd322c82a23cd527c183af9f9.zip external_llvm-776b16d07514be6bd322c82a23cd527c183af9f9.tar.gz external_llvm-776b16d07514be6bd322c82a23cd527c183af9f9.tar.bz2 | |
For PR1152:
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
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/CommandGuide/gccas.pod | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/docs/CommandGuide/gccas.pod b/docs/CommandGuide/gccas.pod index 779d468..56a1749 100644 --- a/docs/CommandGuide/gccas.pod +++ b/docs/CommandGuide/gccas.pod @@ -2,7 +2,7 @@ =head1 NAME -gccas - optimizing LLVM assembler +gccas - convenience script to run B<llvm-as> and B<opt> =head1 SYNOPSIS @@ -10,19 +10,19 @@ B<gccas> [I<options>] I<filename> =head1 DESCRIPTION -The B<gccas> utility takes an LLVM assembly file generated by the -L<llvmgcc|llvmgcc> or L<llvmg++|llvmgxx> front-ends and converts -it into an LLVM bytecode file. It is primarily used by the GCC -front end, and as such, attempts to mimic the interface provided -by the default system assembler so that it can act as a "drop-in" -replacement. +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. +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 @@ -71,7 +71,7 @@ status. =head1 SEE ALSO -L<llvm-as|llvm-as>, L<gccld|gccld> +L<llvm-as|llvm-as>, L<opt|opt>, L<gccld|gccld> =head1 AUTHORS |