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path: root/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
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* ThinLTO: use the callgraph from the combined index to drive the FunctionImporterMehdi Amini2016-03-261-8/+26
| | | | | | | | | | | | | | | | | | Summary: Now that the summary contains the full reference/call graph, we can replace the existing function importer that loads and inspect the IR to iteratively walk the call graph by a traversal based purely on the summary information. Decouple the actual importing decision from any IR manipulation. Reviewers: tejohnson Subscribers: llvm-commits, joker.eph Differential Revision: http://reviews.llvm.org/D18343 From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 264503
* [ThinLTO] Renaming of function index to module summary index (NFC)Teresa Johnson2016-03-151-16/+16
| | | | | | | | | | | | | | | (Resubmitting after fixing missing file issue) With the changes in r263275, there are now more than just functions in the summary. Completed the renaming of data structures (started in r263275) to reflect the wider scope. In particular, changed the FunctionIndex* data structures to ModuleIndex*, and renamed related variables and comments. Also renamed the files to reflect the changes. A companion clang patch will immediately succeed this patch to reflect this renaming. llvm-svn: 263513
* Revert "[ThinLTO] Renaming of function index to module summary index (NFC)"Teresa Johnson2016-03-141-16/+16
| | | | | | This reverts commit r263490. Missed a file. llvm-svn: 263493
* [ThinLTO] Renaming of function index to module summary index (NFC)Teresa Johnson2016-03-141-16/+16
| | | | | | | | | | | | | With the changes in r263275, there are now more than just functions in the summary. Completed the renaming of data structures (started in r263275) to reflect the wider scope. In particular, changed the FunctionIndex* data structures to ModuleIndex*, and renamed related variables and comments. Also renamed the files to reflect the changes. A companion clang patch will immediately succeed this patch to reflect this renaming. llvm-svn: 263490
* [ThinLTO] Support for reference graph in per-module and combined summary.Teresa Johnson2016-03-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: This patch adds support for including a full reference graph including call graph edges and other GV references in the summary. The reference graph edges can be used to make importing decisions without materializing any source modules, can be used in the plugin to make file staging decisions for distributed build systems, and is expected to have other uses. The call graph edges are recorded in each function summary in the bitcode via a list of <CalleeValueIds, StaticCount> tuples when no PGO data exists, or <CalleeValueId, StaticCount, ProfileCount> pairs when there is PGO, where the ValueId can be mapped to the function GUID via the ValueSymbolTable. In the function index in memory, the call graph edges reference the target via the CalleeGUID instead of the CalleeValueId. The reference graph edges are recorded in each summary record with a list of referenced value IDs, which can be mapped to value GUID via the ValueSymbolTable. Addtionally, a new summary record type is added to record references from global variable initializers. A number of bitcode records and data structures have been renamed to reflect the newly expanded scope of the summary beyond functions. More cleanup will follow. Reviewers: joker.eph, davidxl Subscribers: joker.eph, llvm-commits Differential Revision: http://reviews.llvm.org/D17212 llvm-svn: 263275
* Add a flag to the LLVMContext to disable name for Value other than GlobalValueMehdi Amini2016-03-101-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: This is intended to be a performance flag, on the same level as clang cc1 option "--disable-free". LLVM will never initialize it by default, it will be up to the client creating the LLVMContext to request this behavior. Clang will do it by default in Release build (just like --disable-free). "opt" and "llc" can opt-in using -disable-named-value command line option. When performing LTO on llvm-tblgen, the initial merging of IR peaks at 92MB without this patch, and 86MB after this patch,setNameImpl() drops from 6.5MB to 0.5MB. The total link time goes from ~29.5s to ~27.8s. Compared to a compile-time flag (like the IRBuilder one), it performs very close. I profiled on SROA and obtain these results: 420ms with IRBuilder that preserve name 372ms with IRBuilder that strip name 375ms with IRBuilder that preserve name, and a runtime flag to strip Reviewers: chandlerc, dexonsmith, bogner Subscribers: joker.eph, llvm-commits Differential Revision: http://reviews.llvm.org/D17946 From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 263086
* libLTO: add a ThinLTOCodeGenerator on the model of LTOCodeGenerator.Mehdi Amini2016-03-091-0/+384
This is intended to provide a parallel (threaded) ThinLTO scheme for linker plugin use through the libLTO C API. The intent of this patch is to provide a first implementation as a proof-of-concept and allows linker to start supporting ThinLTO by definiing the libLTO C API. Some part of the libLTO API are left unimplemented yet. Following patches will add support for these. The current implementation can link all clang/llvm binaries. Differential Revision: http://reviews.llvm.org/D17066 From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 262977
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