[Bug target/71460] Copying structs can trap (on x86-32) due to SNaN to QNaN

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71460

--- Comment #21 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Uroš Bizjak from comment #19)
> Following test doesn't compile with patched compiler:

BTW: This is preexisting problem, on 64bit target we can trigger the issue with
transparent unions with:

--cut here--
union U { __int128 x; long double y; }  __attribute__ ((transparent_union));

void foo (union U);

void test (void)
{
  union U t;

  foo (1.0L);

  foo ( (__int128) 1);
}
--cut here--

-O2:

union.c:1:7: warning: union cannot be made transparent
 union U { __int128 x; long double y; }  __attribute__ ((transparent_union));