[Bug target/58416] Incorrect x87-based union copying code

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58416

--- Comment #23 from Richard Biener <rguenth at gcc dot gnu.org> ---
So it's from

    return (struct form_time)
      {
 .form = TIMEFORM_HI_LO,
 .time = decode_ticks_hz (specified_time, make_fixnum (1), cform)
      };

with

union c_time
{
  struct ticks_hz th;
  struct timespec ts;
  double d;
};

struct form_time
{
  enum timeform form;
  union c_time time;
};

since there's also

   .form = TIMEFORM_FLOAT,
   .time = decode_float_time (d, cform)

and that one is inlined we're likely only seeing an access to the double
union component and otherwise aggregate union accesses.

Still needs a reduction.