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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/108647] [13 Regression] ICE in upper_bound,
 at value-range.h:950 with -O3 since r13-2974-g67166c9ec35d58ef
Date: Fri, 03 Feb 2023 15:23:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108647

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Andrew Macleod from comment #9)
> (In reply to Jakub Jelinek from comment #8)
> > Unfortunately that would mean for the non-equality cases that if
> > lhs.undefined_p () we don't return undefined but false (aka VARYING).
> > Another option is to add those if (op?.undefined_p ()) return false; to=
 both
> > case BRS_TRUE: and case BRS_FALSE:.
>=20
> Well, if the LHS is undefined, (or even one of the operands) we are
> typically in dead code or edge anyway.. I'm not sure it really matters?

Ok, I'll test the patch then.

> An alternate question as well is why is the threader even looking at this
> impossible path. It should know that the branch can never be true

I think range-op shouldn't assume nothing will call it with UNDEFINED range=
s.=