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From: "vsevolod.livinskiy at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105621] New: [13 Regression] Wrong code with
 -O3
Date: Mon, 16 May 2022 19:03:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105621

            Bug ID: 105621
           Summary: [13 Regression] Wrong code with -O3
           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/jscK4bTP6

Reproducer:
#include <stdio.h>

unsigned short a =3D (unsigned short)31272;
int b =3D -1902905271;
unsigned int c =3D 1618489477U;
bool d =3D (bool)0;

void test(unsigned short a, int b, unsigned c) __attribute__((noipa));
void test(unsigned short a, int b, unsigned c) {
  for (int i =3D 2; i < 24; i +=3D 3)
    d =3D b ? a ? c : 2086607777901731118 : 0;=20
}

int main() {
    test(a, b, c);
    printf("%d\n", (int)d);
    if (d !=3D 1)
      __builtin_abort();
}

Error:
>$ g++ -O2 driver.cpp && ./a.out=20
1
>$ g++ -O3 driver.cpp && ./a.out=20
0
Aborted (core dumped)

GCC version 13.0.0 20220516 (69c4b5c519f0df37e4903992644cc29682721bc1)=