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From: "vsevolod.livinskiy at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/108166] New: [12/13 Regression] Wrong code
 with -O2
Date: Sun, 18 Dec 2022 19:46:01 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: vsevolod.livinskiy at gmail dot com
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108166

            Bug ID: 108166
           Summary: [12/13 Regression] Wrong code with -O2
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vsevolod.livinskiy at gmail dot com
  Target Milestone: ---

Link to the Compiler Explorer: https://godbolt.org/z/j8coqj375

Reproducer:
#include <stdio.h>
bool a, b;
int d, c;
const int &e(const int &f, const int &g) { return !f ? f : g; }
int main() {
  c =3D e(b, 0) > ((b ? d : b) ?: 8);
  a =3D b ? d : b;
  printf("%d\n", a);
  if (a !=3D 0)
    __builtin_abort();
}

Error:
>$ g++ -O2 driver.cpp && ./a.out=20
1
Aborted (core dumped)
>$ g++ -O0 driver.cpp && ./a.out=20
0

gcc version 13.0.0 20221216 (2fdc8546b5c6cb1fe254e40b5bdd19ed6fbb44da)=