[all-commits] [llvm/llvm-project] 3d9511: [X86] Add test case for a regression from D76649. NFC

[topperc via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 3d9511a311a038d83022a31f2a846e76e21d70be
      https://github.com/llvm/llvm-project/commit/3d9511a311a038d83022a31f2a846e76e21d70be
  Author: Craig Topper <craig.topper at intel.com>
  Date:   2020-05-13 (Wed, 13 May 2020)

  Changed paths:
    M llvm/test/CodeGen/X86/madd.ll

  Log Message:
  -----------
  [X86] Add test case for a regression from D76649. NFC

When combineLoopMAdd was moved to IR we got stricter about
ensuring the truncate was free. This prevents us from matching
this sum of squares of byte differences pattern show here.

We used to get this case when it was in SelectionDAG.