[Bug rtl-optimization/119594] [15 regression] wrong code at -Os with "-fno-dce -fno-tree-dce -fno-tree-dse" on x86_64-linux-gnu

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119594

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
RTL fwprop1 is removing:
(insn 7 2 8 2 (set (reg/v:DI 101 [ gD.2871 ])
        (const_int -1 [0xffffffffffffffff])) "/app/example.cpp":9:10 95
{*movdi_internal}
     (expr_list:REG_UNUSED (reg/v:DI 101 [ gD.2871 ])
        (nil)))


The reg unused is incorrect after cse1. Did someone forgot to update the
REG_UNUSED again?