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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109732] [14 regression] gcc miscompiles
 iterator comparison on nlohmann_json since r14-204-gf1f5cbaa3f716f
Date: Thu, 04 May 2023 16:40:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109732

--- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 54998
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54998&action=3Dedit
Gimple testcase that fails at runtime too

-O1 -fgimple -fdisable-tree-ethread -fdisable-tree-fre1


The thing is you need the false edge to be the first successor edge of BB2.=
 So
you have to get forwprop to swap the edges from being true and false. Also
gimple front-end does not like bool constants that well.=