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From: "xry111 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111403] New: LoongArch: Wrong code with -O -mlasx
 -fopenmp-simd
Date: Wed, 13 Sep 2023 10:46:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111403

            Bug ID: 111403
           Summary: LoongArch: Wrong code with -O -mlasx -fopenmp-simd
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: xry111 at gcc dot gnu.org
  Target Milestone: ---

Testcase:

struct S
{
  int s;
  S () : s (0) {}
  ~S () {}
  S (const S &x) { s =3D x.s; }
  S &
  operator=3D (const S &x)
  {
    s =3D x.s;
    return *this;
  }
};

S r, a[1024], b[1024];

#pragma omp declare reduction(+ : S : omp_out.s +=3D omp_in.s)

__attribute__ ((noipa)) void
foo (S *a, S *b)
{
#pragma omp simd reduction(inscan, + : r)
  for (int i =3D 0; i < 1024; i++)
    {
      r.s +=3D a[i].s;
#pragma omp scan inclusive(r)
      b[i] =3D r;
    }
}

int
main ()
{
  S s;
  for (int i =3D 0; i < 1024; ++i)
    {
      a[i].s =3D i;
      b[i].s =3D -1;
    }
  foo (a, b);
  if (r.s !=3D 1024 * 1023 / 2)
    __builtin_abort ();
  return 0;
}

$ g++ t.cc -O -mlasx -fopenmp-simd
$ ./a.out
Aborted (core dumped)=