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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103464] [12 Regression] ICE on valid code at
 -O1 (with -ftree-vrp and ulimit -s 512) on x86_64-linux-gnu: Segmentation
 fault since r12-5522-g661c02e54ea72fb5
Date: Mon, 29 Nov 2021 10:44:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103464

--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that r12-5522-g661c02e54ea72fb5 doubled the stack use of the frame by
adding another int_range_max local to range_of_phi.

First of all in the rev we should have used intersect_, not union_, and if =
we
consider that we can simply treat it like single_arg (which we even set),
and thus elide equiv_range completely by using arg_range which is already
computed?  If there are only equivalences to the PHI def then the PHI must
be undefined (but I wonder how such PHI is even possible - did you have a
testcase for this?)=