[all-commits] [llvm/llvm-project] f02505: [MemCpyOpt] Handle unusual memcpy element type

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f025053977f330152da081b7060a5d9cba0a9e22
      https://github.com/llvm/llvm-project/commit/f025053977f330152da081b7060a5d9cba0a9e22
  Author: Nikita Popov <nikita.ppv at gmail.com>
  Date:   2021-06-27 (Sun, 27 Jun 2021)

  Changed paths:
    M llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
    M llvm/test/Transforms/MemCpyOpt/memset-memcpy-redundant-memset.ll

  Log Message:
  -----------
  [MemCpyOpt] Handle unusual memcpy element type

Apparently, it is legal to use memcpy/memset with pointer types
other than i8*. Prior to 81fcdae68c5ff656c30032fd26c6a21af4c51dbb
this case was silently miscompiled, as the i8 offset calculation
was performed on some other type. Now it would crash due to a
type mismatch. Fix this by inserting an explicit bitcast to i8*.