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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94482] Inserting into vector with optimization enabled
 on x86 generates incorrect result
Date: Mon, 06 Apr 2020 07:14:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94482

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reduced testcase (-O2 -msse2 -m32):
typedef unsigned V __attribute__ ((__vector_size__ (16)));
union U
{
  V j;
  unsigned long long i __attribute__ ((__vector_size__ (16)));
};

static inline __attribute__((always_inline)) V
foo (unsigned long long a)
{
  union U z =3D { .j =3D (V) {} };
  for (unsigned long i =3D 0; i < 1; i++)
    z.i[i] =3D a;
  return z.j;
}

static inline __attribute__((always_inline)) V
bar (V a, unsigned long long i, int q)
{
  union U z =3D { .j =3D a };
  z.i[q] =3D i;
  return z.j;
}

int
main ()
{
  union U z =3D { .j =3D bar (foo (1729), 2, 1) };
  if (z.i[0] !=3D 1729)
    __builtin_abort ();
  return 0;
}=