[all-commits] [llvm/llvm-project] c987f2: [PGO] Make the PGO instrumentation insert point af...

[xur-llvm via All-commits]

  Branch: refs/heads/users/xur-llvm/pgowork
  Home:   https://github.com/llvm/llvm-project
  Commit: c987f239cc1c50c26ade6633fecbcf560dc83aaf
      https://github.com/llvm/llvm-project/commit/c987f239cc1c50c26ade6633fecbcf560dc83aaf
  Author: Rong Xu <xur at google.com>
  Date:   2025-05-30 (Fri, 30 May 2025)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
    A llvm/test/Transforms/PGOProfile/entry_alloca.ll
    M llvm/test/Transforms/PGOProfile/split-indirectbr-critical-edges.ll

  Log Message:
  -----------
  [PGO] Make the PGO instrumentation insert point after alloca

We're changing PGO instrumentation to insert the intrinsic after
alloca instructions. For sampled instrumentation, a conditional
check is placed before the intrinsic. If this intrinsic comes
before an alloca, the alloca will be placed in the BB after entry.
In this case, the allocas will not be combined, resulting in
inefficient code. We have seen some stack overflows due to this.

This patch guarantees the intrinsic is always after the alloca.



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