[all-commits] [llvm/llvm-project] d77f07: [TailCallElim] Don’t mark llvm.stackrestore with t...

[Shimin Cui via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d77f07d166618d0f33500b518144ada99be2f13f
      https://github.com/llvm/llvm-project/commit/d77f07d166618d0f33500b518144ada99be2f13f
  Author: Shimin Cui <scui at ca.ibm.com>
  Date:   2024-08-05 (Mon, 05 Aug 2024)

  Changed paths:
    M llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
    A llvm/test/Transforms/TailCallElim/stackrestore.ll

  Log Message:
  -----------
  [TailCallElim] Don’t mark llvm.stackrestore with tail-call  (#101352)

This is to teach tailcallelim transformation not to mark
llvm.stackrestore with tail-call, as the intrinsic call can modify
unescaped allocas from the caller.
 
This fixes a problem found with our downstream testing. The problem can
also be shown when running the test case
llvm/test/Transforms/MemCpyOpt/stackrestore with passes=”tailcallelim,
memcpyopt”.



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