https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69014

--- Comment #11 from Richard Henderson <rth at gcc dot gnu.org> ---
Created attachment 37336
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37336&action=edit
proposed patch

This appears to work on this test case, producing the expected

  Doloop: doloop pattern clobbers live out

Now pushing it through a larger set of testing.

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