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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/96015] [10/11 Regression] gcc-10.1.0 miscompiles Python
 on hppa
Date: Wed, 01 Jul 2020 17:33:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96015

--- Comment #13 from Jeffrey A. Law <law at redhat dot com> ---
Hmm, there's a control dependency though in bb13:

  <bb 13> [local count: 242478389]:
  # result_21 =3D PHI <1(5), sign_17(6)>
  switch (op_14(D)) <default: <L12> [33.33%], case 0: <L6> [16.67%], case 1:
<L14> [50.00%], case 3: <L14> [50.00%], case 5: <L14> [50.00%]>
}

So I'd hazard a guess that sign_17 either has the value 1 here or that
result_21 is unused, otherwise you're right that cddce shouldn't remove the
block.=