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| author | Rui Ueyama <ruiu@google.com> | 2015-06-15 02:46:18 +0000 |
|---|---|---|
| committer | Rui Ueyama <ruiu@google.com> | 2015-06-15 02:46:18 +0000 |
| commit | 095409e9e87cdbdf8edc11877fd0f7962ae1b479 (patch) | |
| tree | a2b264447dae3639fa75acbd94f93f0913ba04b2 /lld | |
| parent | d0ca8d7edd96c8a99736c19d15bbfd15e91df7f1 (diff) | |
| download | bcm5719-llvm-095409e9e87cdbdf8edc11877fd0f7962ae1b479.tar.gz bcm5719-llvm-095409e9e87cdbdf8edc11877fd0f7962ae1b479.zip | |
COFF: Add a brief description about LTO.
llvm-svn: 239714
Diffstat (limited to 'lld')
| -rw-r--r-- | lld/COFF/README.md | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lld/COFF/README.md b/lld/COFF/README.md index 1b2f1375de6..a2d438be47c 100644 --- a/lld/COFF/README.md +++ b/lld/COFF/README.md @@ -191,6 +191,20 @@ We created an experimental multi-threaded linker using the Microsoft ConcRT concurrency library, and it was able to link itself in 0.5 seconds, so we think the design is promising. +Link-Time Optimization +---------------------- + +LTO is implemented by handling LLVM bitcode files as input files. +The linker resolves symbols in bitcode files normally. If all symbols +are successfully resolved, it then calls an LLVM libLTO function +with all bitcode files to convert them to one big regular COFF file. +Finally, the linker replaces bitcode symbols with COFF symbols, +so that we can link the input files as if they were in COFF format +from the beginning. + +The details are described in this document. +http://llvm.org/docs/LinkTimeOptimization.html + Glossary -------- |
