[Bug tree-optimization/103417] [12 Regression] wrong code at -O1 and above on x86_64-linux-gnu since r12-5489

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103417

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
generic_simplify_GE_EXPR is called with
BIT_FIELD_REF <c, 32, 0> & 4294967040U
and
0U
arguments, and transforms that into
BIT_FIELD_REF <c, 32, 0> <= 255.  That is wrong,
(BIT_FIELD_REF <c, 32, 0> & 4294967040U) >= 0U
is always true (anything >= 0U is true).