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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/109585] Carla/sord miscompiled with -O2 on
 ARM64 with flexible array member
Date: Sat, 22 Apr 2023 21:48:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109585

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amonakov at gcc dot gnu.org

--- Comment #13 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
The small repro from comment #5 is reproducible on x86_64 trunk as well with
-O2 -DNDEBUG (as well as on older x86_64 branches without -DNDEBUG).

sched2 is lifting

(insn:TI 295 100 101 12 (set (reg:CCZ 17 flags)
        (compare:CCZ (mem/f:DI (plus:DI (reg/v/f:DI 3 bx [orig:133 t ] [133=
])
                    (const_int 8 [0x8])) [2 MEM[(const struct ZixBTreeIter
*)t_3(D)].stack[0].node+0 S8 A64])
            (const_int 0 [0]))) "/app/example.c":65:12 discrim 2 8
{*cmpdi_ccno_1}
     (nil))

above conflicting=20

(insn 101 295 102 12 (set (mem/f:DI (reg/v/f:DI 0 ax [orig:96 f ] [96]) [2
f_69->node+0 S8 A64])
        (const_int 0 [0])) "/app/example.c":86:14 88 {*movdi_internal}
     (nil))=