[all-commits] [llvm/llvm-project] afb526: [LICM] Handle store of pointer to itself (PR54495)

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: afb526b3f49e06d1b72986d3bc4c5d445cfda05b
      https://github.com/llvm/llvm-project/commit/afb526b3f49e06d1b72986d3bc4c5d445cfda05b
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2022-03-22 (Tue, 22 Mar 2022)

  Changed paths:
    M llvm/lib/Transforms/Scalar/LICM.cpp
    A llvm/test/Transforms/LICM/pr54495.ll

  Log Message:
  -----------
  [LICM] Handle store of pointer to itself (PR54495)

Rather than iterating over users and comparing operands, iterate
over uses and check operand number. Otherwise, we'll end up
promoting a store twice if it has two equal operands.

This can only happen with opaque pointers, as otherwise both
operands differ by a level of indirection, so a bitcast would have
to be involved.

Fixes https://github.com/llvm/llvm-project/issues/54495.