[all-commits] [llvm/llvm-project] c61832: [memprof] Teach extractCallsFromIR to look into in...

[Kazu Hirata via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c61832444d7539eddb939df1107a751a6784aff3
      https://github.com/llvm/llvm-project/commit/c61832444d7539eddb939df1107a751a6784aff3
  Author: Kazu Hirata <kazu at google.com>
  Date:   2024-11-08 (Fri, 08 Nov 2024)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/MemProfiler.cpp
    M llvm/unittests/Transforms/Instrumentation/MemProfUseTest.cpp

  Log Message:
  -----------
  [memprof] Teach extractCallsFromIR to look into inline stacks (#115441)

To undrift the profile, we need to extract as many caller-callee pairs
from the IR as we can to maximize the number of call sites in the
profile we can undrift.

Now, since MemProfUsePass runs after early inlining, some functions
have been inlined, and we may no longer have bodies for those
functions in the IR.  To cope with this, this patch teaches
extractCallsFromIR to extract caller-calee pairs from inline stacks.

The output format of extractCallsFromIR remains the same.  We still
return a map from caller GUIDs to lists of corresponding call sites.



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