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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114190] wrong code with -O2 -fno-dce -fharden-compares
 -mvpclmulqdq --param=max-rtl-if-conversion-unpredictable-cost=136
Date: Fri, 01 Mar 2024 21:04:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114190

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So after reload, it looks ok:
(insn 22 21 380 2 (set (reg:CCZ 17 flags)
        (compare:CCZ (reg:SI 4 si [orig:111 _21+4 ] [111])
            (const_int 0 [0]))) "/app/example.cpp":8:8 discrim 1 7
{*cmpsi_ccno_1}
     (nil))
(insn 380 22 381 2 (parallel [
            (set (reg:DI 1 dx [353])
                (plus:DI (reg/f:DI 7 sp)
                    (const_int 212 [0xd4])))
            (clobber (reg:CC 17 flags))
        ]) "/app/example.cpp":8:65 discrim 1 272 {*adddi_1}
     (expr_list:REG_EQUIV (plus:DI (reg/f:DI 16 argp)
            (const_int 76 [0x4c]))
        (nil)))
(insn 381 380 466 2 (set (reg:CCZ 17 flags)
        (compare:CCZ (reg:SI 4 si [orig:111 _21+4 ] [111])
            (const_int 0 [0]))) "/app/example.cpp":8:65 discrim 1 7
{*cmpsi_ccno_1}
     (nil))

Note without -fno-dce, `insn 22` is not in the IR and that is the only
difference so far. THis is ok at this point.=