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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/60960] [4.8/4.9/4.10 Regression] Wrong result when a vector variable is divided by a literal constant
Date: Fri, 25 Apr 2014 07:12:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60960

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |4.8.3
            Summary|Wrong result when a vector  |[4.8/4.9/4.10 Regression]
                   |variable is divided by a    |Wrong result when a vector
                   |literal constant            |variable is divided by a
                   |                            |literal constant

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
typedef unsigned char v4qi __attribute__ ((vector_size (4)));

__attribute__((noinline, noclone)) v4qi
f1 (v4qi v)
{
  return v / 2;
}

__attribute__((noinline, noclone)) v4qi
f2 (v4qi v)
{
  return v / (v4qi) { 2, 2, 2, 2 };
}

__attribute__((noinline, noclone)) v4qi
f3 (v4qi x, v4qi y)
{
  return x / y;
}

int
main ()
{
  v4qi x = { 5, 5, 5, 5 };
  v4qi y = { 2, 2, 2, 2 };
  v4qi z = f1 (x);
  if (__builtin_memcmp (&y, &z, sizeof (y)) != 0)
    __builtin_abort ();
  z = f2 (x);
  if (__builtin_memcmp (&y, &z, sizeof (y)) != 0)
    __builtin_abort ();
  z = f3 (x, y);
  if (__builtin_memcmp (&y, &z, sizeof (y)) != 0)
    __builtin_abort ();
  return 0;
}

Started with my r189043.  Will have a look.