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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/106249] [13 Regression] ICE in
 check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:645
Date: Mon, 11 Jul 2022 07:38:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106249

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |jason at gcc dot gnu.org,
                   |                            |rguenth at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-07-11

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  The issue is that __builtin_unreachable () is 'const' while
__builtin_trap () is neither 'const' nor 'pure'.  Passes inserting
__builtin_unreachable () rightfully expect 'unreachable' semantics.

IMHO changing __builtin_unreachable to __builtin_trap under-the-hood was a
very wrong thing to do.

Can we reconsider that please?=