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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111465] [14 regression] stage 3 ICE kills
 bootstrap from r14-4089-gd45ddc2c04e471d0dcee01
Date: Tue, 19 Sep 2023 10:19:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111465

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D102844
                 CC|                            |law at gcc dot gnu.org

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
So we simplify


 if (iftmp.2_137 <=3D location_138)
   ..
 else
   {
     _16 =3D (signed) prephitmp_15;
     if (_16 < 0)
...

to

 _192 =3D (signed) location_138;
 if (0)
   ..
 else
  {
     _16 =3D (signed) prephitmp_15;
     if (_16 < 0)
...

and then thread - actually we have registered the forward thread already
and registered the block with the def of _192 as EDGE_NO_COPY_SRC_BLOCK
(because it was empty before).  This is essentially a duplicate of PR102844
which has gone latent.=