[PATCH] D41976: Low-hanging fruit optimization in string::__move_assign().

[Timothy VanSlyke via Phabricator via cfe-commits]

tvanslyke added a comment.

Here are the results:

  Comparing old-copymove.json to new-copymove.json
  Benchmark                        Time             CPU      Time Old      Time New       CPU Old       CPU New
  -------------------------------------------------------------------------------------------------------------
  BM_string_move_SSO            -0.5833         -0.5833            12             5            12             5
  BM_string_copy_SSO            +0.0000         +0.0000            23            23            23            23
  BM_string_move_no_SSO         -0.6250         -0.6250             8             3             8             3
  BM_string_copy_no_SSO         +0.0000         +0.0000            11            11            11            11
  BM_string_stable_sort         -0.0779         -0.0779       2772114       2556118       2772031       2556036

I put the benchmark on pastebin because it's a tad too long to paste here IMO:  https://pastebin.com/mk1JXQme


https://reviews.llvm.org/D41976