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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/109342] New: [13 Regression] Wrong code with
 -O2
Date: Thu, 30 Mar 2023 07:12:10 +0000
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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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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109342

            Bug ID: 109342
           Summary: [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/zKqcna3vn

Reproducer:
#include <stdio.h>

unsigned long long int var_4 =3D 42;
unsigned long long int var_14 =3D 10;
unsigned char var_16 =3D 1;
unsigned short var_18 =3D 0;
short var_75;

inline const int &foo(const int &b, const int &c) { return b < c ? c : b; }
inline unsigned long long &bar(unsigned long long &b, unsigned long long &c=
) {
  return !c ? c : b;
}

void test(unsigned long long var_4, unsigned long long var_14,
          unsigned char var_16, unsigned short var_18) __attribute__((noipa=
));
void test(unsigned long long var_4, unsigned long long var_14,
          unsigned char var_16, unsigned short var_18) {
  for (bool h =3D 0; h < (bool)foo(var_16 ? -7 : 4, var_4 ? var_4 : var_18);
       h =3D 2)
    var_75 =3D bar(var_4, var_14);
}

int main() {
  test(var_4, var_14, var_16, var_18);
  printf("%hd\n", var_75);
  if (var_75 !=3D 42)
    __builtin_abort();
}

Error:
>$ g++ -O0 small.cpp && ./a.out=20
42
>$ g++ -O2 small.cpp && ./a.out=20
0
Aborted (core dumped)

gcc version 13.0.1 20230329 (3be4e43a6a0f429648ea188c8e110b74268fed27)=