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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/110228] [14 Regression] llvm-16 miscompiled due to
 an maybe uninitialized and optimizations saying that the uninitialized has a
 nonzero bits of 1.
Date: Fri, 16 Jun 2023 22:23:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110228

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>From the duplicate bug report analysis:
  # RANGE [irange] short int [0, 1] NONZERO 0x1
  # n_lsm.35_15 =3D PHI <_10(9), n_lsm.35_45(12)>
...
  # RANGE [irange] short int [0, 1] NONZERO 0x1
  # n_lsm.35_45 =3D PHI <n_lsm.35_15(11), _69(D)(6)>

  # RANGE [irange] short int [0, 1] NONZERO 0x1
  _10 =3D (short intD.17) _9;

But the range of _69(D) is really undefined ....

There is nothing phiopt/match is doing incorrectly due to the above, rather=
 it
is ranger that might be considering the wrong/incorrect information for
uninitialized variables ...=