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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/105532] [11/12/13 Regression] UBSAN:
 gcc/hwint.h:293:61: runtime error: shift exponent 64 is too large for 64-bit
 type 'long unsigned int'
Date: Wed, 02 Nov 2022 16:30:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105532

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> Confirmed.
> The bug is either in tree_nonzero_bits and should not be doing:
>   return wi::shwi (-1, TYPE_PRECISION (TREE_TYPE (t)));

Just FYI, TYPE_PRECISION for vectors is a log2 of the number of elements, s=
ee
TYPE_VECTOR_SUBPARTS. Which is why you get 0 here since we have 1 element.=