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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ada/65519] [5 regression] unable to coalesce ssa_names 2 and 87 which are marked as MUST COALESCE
Date: Mon, 23 Mar 2015 14:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65519

--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
It's forwprop4 propagating an abnormal SSA name:

  <bb 5>:
  [...]
  I.3_30(ab) = I.3_1 + 1;
  _31 = (interfaces__unsigned_32) I.3_30(ab);

[...]

  <bb 13>:
  _43 = v.P_ARRAY;
  _45 = (sizetype) _31;

is changed into:

  <bb 13>:
  _43 = v.P_ARRAY;
  _71 = I.3_30(ab) & 4294967295;

but I.3_87(ab) is live in BB 13.