Teresa Johnson 44ebb78e5e [ThinLTO] Efficiency fix for writing type id records in per-module indexes ... Summary: In D49565/r337503, the type id record writing was fixed so that only referenced type ids were emitted into each per-module index for ThinLTO distributed builds. However, this still left an efficiency issue: each per-module index checked all type ids for membership in the referenced set, yielding O(M*N) performance (M indexes and N type ids). Change the TypeIdMap in the summary to be indexed by GUID, to facilitate correlating with type identifier GUIDs referenced in the function summary TypeIdInfo structures. This allowed simplifying other places where a map from type id GUID to type id map entry was previously being used to aid this correlation. Also fix AsmWriter code to handle the rare case of type id GUID collision. For a large internal application, this reduced the thin link time by almost 15%. Reviewers: pcc, vitalybuka Subscribers: mehdi_amini, inglorion, steven_wu, dexonsmith, llvm-commits Differential Revision: https://reviews.llvm.org/D51330 llvm-svn: 343021		2018-09-25 20:14:40 +00:00
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Reader	Ensure that variant part discriminator is read by MetadataLoader	2018-09-21 12:03:14 +00:00
Writer	[ThinLTO] Efficiency fix for writing type id records in per-module indexes	2018-09-25 20:14:40 +00:00
CMakeLists.txt
LLVMBuild.txt