[all-commits] [llvm/llvm-project] 50fea9: Reland "[ThinLTO][Bitcode] Generate import type in...

[Mingming Liu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 50fea9943fa59ed1aeb4538e0f715cc01db58a9a
      https://github.com/llvm/llvm-project/commit/50fea9943fa59ed1aeb4538e0f715cc01db58a9a
  Author: Mingming Liu <mingmingl at google.com>
  Date:   2024-07-08 (Mon, 08 Jul 2024)

  Changed paths:
    M llvm/include/llvm/Bitcode/BitcodeWriter.h
    M llvm/include/llvm/IR/ModuleSummaryIndex.h
    M llvm/include/llvm/LTO/legacy/ThinLTOCodeGenerator.h
    M llvm/include/llvm/Transforms/IPO/FunctionImport.h
    M llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
    M llvm/lib/LTO/LTO.cpp
    M llvm/lib/LTO/ThinLTOCodeGenerator.cpp
    M llvm/lib/Transforms/IPO/FunctionImport.cpp
    M llvm/test/ThinLTO/X86/import_callee_declaration.ll
    M llvm/tools/llvm-lto/llvm-lto.cpp

  Log Message:
  -----------
  Reland "[ThinLTO][Bitcode] Generate import type in bitcode" (#97253)

https://github.com/llvm/llvm-project/pull/87600 was reverted in order to
revert
https://github.com/llvm/llvm-project/commit/6262763341fcd71a2b0708cf7485f9abd1d26ba8.
Now https://github.com/llvm/llvm-project/pull/95482 is fix forward for
https://github.com/llvm/llvm-project/commit/6262763341fcd71a2b0708cf7485f9abd1d26ba8.
This patch is a reland for
https://github.com/llvm/llvm-project/pull/87600

**Changes on top of original patch**
In `llvm/include/llvm/IR/ModuleSummaryIndex.h`, make the type of
`GVSummaryPtrSet` an `unordered_set` which is more memory efficient when
the number of elements is smaller than 128 [1]

**Original commit message**

For distributed ThinLTO, the LTO indexing step generates combined
summary for each module, and postlink pipeline reads the combined
summary which stores the information for link-time optimization.

This patch populates the 'import type' of a summary in bitcode, and
updates bitcode reader to parse the bit correctly.

[1]
https://github.com/llvm/llvm-project/blob/393eff4e02e7ab3d234d246a8d6912c8e745e6f9/llvm/lib/Support/SmallPtrSet.cpp#L43



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