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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/112304] cinc is not being used for (small) constant
Date: Tue, 31 Oct 2023 04:51:14 +0000
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X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112304

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Trying 35 -> 16:
   35: r95:SI=3Dcc:CC!=3D0
      REG_DEAD cc:CC
   16: x0:SI=3Dr95:SI+0x2a
      REG_DEAD r95:SI
Failed to match this instruction:
(set (reg/i:SI 0 x0)
    (plus:SI (ne:SI (reg:CC 66 cc)
            (const_int 0 [0]))
        (const_int 42 [0x2a])))


vs:


Trying 9 -> 14:
    9: r97:SI=3Dcc:CC!=3D0+r101:SI
      REG_DEAD cc:CC
      REG_DEAD r101:SI
   14: x0:SI=3Dr97:SI
      REG_DEAD r97:SI
Successfully matched this instruction:
(set (reg/i:SI 0 x0)
    (plus:SI (ne:SI (reg:CC 66 cc)
            (const_int 0 [0]))
        (reg:SI 101)))=