[all-commits] [llvm/llvm-project] e83847: [X86] Add regression test case from pr64593

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e838471bc4936854ced32709f7f105af87aed798
      https://github.com/llvm/llvm-project/commit/e838471bc4936854ced32709f7f105af87aed798
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2023-08-10 (Thu, 10 Aug 2023)

  Changed paths:
    A llvm/test/CodeGen/X86/pr64593.ll

  Log Message:
  -----------
  [X86] Add regression test case from pr64593

This is the case which triggered the revert of 660b740.  Note that the test is extremely fragile as it depends on getting a truncating store at the right moment rather than folding the constant to a narrower bitwidth.  This appears to happen on skylake, but not e.g. plain avx.