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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107172] [13 Regression] wrong code with "-O1 -ftree-vrp"
 on x86_64-linux-gnu since r13-1268-g8c99e307b20c502e
Date: Thu, 13 Oct 2022 17:49:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107172

--- Comment #27 from H.J. Lu <hjl.tools at gmail dot com> ---
Another oddity is

  (set (pc) (if_then_else
               (eq (reg:CCO FLAGS_REG) (const_int 0))
               (label_ref (match_operand 3))
               (pc)))]

CCOmode means that the overflow flag is tested.  EQ means that the flag is =
set
and NE
means unset.=