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From: "vsevolod.livinskij at frtk dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/98381] New: Wrong code with -O3
 -march=skylake-avx512
Date: Fri, 18 Dec 2020 20:03:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98381

            Bug ID: 98381
           Summary: Wrong code with -O3 -march=3Dskylake-avx512
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vsevolod.livinskij at frtk dot ru
  Target Milestone: ---

Reproducer:
//func.cpp
extern bool var_22;
void test(long long a, unsigned b, unsigned long long c) {
  for (long i =3D 0; i < 16; i +=3D 1ULL)
    if (a)
      var_22 =3D 5023804122334ULL >=3D (char)c;
}

//driver.cpp=20
#include <stdio.h>
long long int a =3D -2161098602020439353LL;
unsigned int b =3D 1621447385U;
unsigned long long int c =3D 16505450185101189749ULL;
bool var_22 =3D (bool)0;

void test(long long int a, unsigned int b, unsigned long long int c);

int main() {
    test(a, b, c);
    printf("%d\n", (int)var_22);
}

Error:
>$ g++ -O3 -march=3Dskylake-avx512 func.cpp driver.cpp && sde -skx -- ./a.o=
ut
0
>$ g++ -O0 func.cpp driver.cpp && sde -skx -- ./a.out
1

gcc version 11.0.0 20201217 (6f8486523f61bf0aa476dfa4197d1e3b71a0a8f3) (GCC=
)=