https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89679
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The first thing which looks invalid to me is when fwprop1 adds a bogus
REG_EQUAL note:
(insn 17 6 19 2 (set (reg:SI 140)
(const_int -1 [0xffffffffffffffff])) "pr89679.c":16:3 494
{*movsi_internal1}
(expr_list:REG_DEAD (reg:HI 138 [ c ])
(expr_list:REG_DEAD (reg:HI 136 [ c ])
(expr_list:REG_EQUAL (const_int 65535 [0xffff])
(nil)))))
SImode -1 is certainly not equal to 0xffff.
