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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110381] [11/12/13/14 Regression] double
 counting for sum of structs of floating point types
Date: Mon, 26 Jun 2023 09:33:34 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110381

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
C testcase:

struct FOO {
   double a;
   double b;
   double c;
};

double __attribute__((noipa))
sum_8_foos(const struct FOO* foos)
{
    double sum =3D 0;

    for (int i =3D 0; i < 8; ++i) {
        struct FOO foo =3D foos[i];

        sum +=3D foo.c;
        sum +=3D foo.b;
        sum +=3D foo.a;
    }

    return sum;
}

int main()
{
  struct FOO foos[8];

  __builtin_memset (foos, 0, sizeof (foos));
  foos[0].b =3D 5;

  if (sum_8_foos (foos) !=3D 5)
    __builtin_abort ();
  return 0;
}=