https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66801
--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
So, if it is related to vectorization (if I ever get to reproduce it I'll try
-fno-tree-vectorize) then it might be the
/* If arg0 is derived from the address of an object or function, we may
be able to fold this expression using the object or function's
alignment. */
(simplify
(bit_and (convert? @0) INTEGER_CST@1)
(if (POINTER_TYPE_P (TREE_TYPE (@0))
&& tree_nop_conversion_p (type, TREE_TYPE (@0)))
(with
{
unsigned int align;
unsigned HOST_WIDE_INT bitpos;
get_pointer_alignment_1 (@0, &align, &bitpos);
}
(if (wi::ltu_p (@1, align / BITS_PER_UNIT))
{ wide_int_to_tree (type, wi::bit_and (@1, bitpos / BITS_PER_UNIT)); }))))
pattern somehow going wild (from triggering within CCP itself?). Thus as
third step I'll try disabling that one.
