[PATCH] D33922: Apply summary-based dead stripping to regular LTO modules with summaries.

[Peter Collingbourne via Phabricator via llvm-commits]

pcc created this revision.
Herald added subscribers: eraman, inglorion.
Herald added a reviewer: hiraditya.

If a regular LTO module has a summary index, then instead of linking
it into the combined regular LTO module right away, add it to the
combined summary index and associate it with a special module that
represents the combined regular LTO module.

Any such modules are linked during LTO::run(), at which time we use
the results of summary-based dead stripping to control whether to
link prevailing symbols.

Depends on https://reviews.llvm.org/D33921


https://reviews.llvm.org/D33922

Files:
  clang/lib/CodeGen/BackendUtil.cpp
  clang/test/CodeGen/Inputs/thinlto-multi-module.ll
  clang/test/CodeGen/thinlto-multi-module.ll
  llvm/include/llvm/Bitcode/BitcodeReader.h
  llvm/include/llvm/IR/ModuleSummaryIndex.h
  llvm/include/llvm/LTO/LTO.h
  llvm/lib/Bitcode/Reader/BitcodeReader.cpp
  llvm/lib/LTO/LTO.cpp
  llvm/test/LTO/Resolution/X86/Inputs/dead-strip-fulllto.ll
  llvm/test/LTO/Resolution/X86/dead-strip-fulllto.ll

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