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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103037] [11/12 Regression] Wrong code with
 -O2 since r11-6100-gd41b097350d3c5d0
Date: Wed, 03 Nov 2021 10:08:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103037

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
So we value number iftmp.0_15 to _3 and things start to go downhill when we
PHI translate _25 / iftmp.0_10 5 -> 7 as _24 / _3 since there's too much
sharing of the PRE IL used for PHI translation and the VN tables used for
value-numbering.

I did try to untangle this mess a few times already.  I will see what I can=
 do
during stage3.=