[Bug target/100887] [12 Regression] ICE: in ix86_expand_vector_init_concat, at config/i386/i386-expand.c:14178 with -mavx512f and __builtin_shufflevector()

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100887

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Slightly adjusted so that it doesn't use uninitialized vars and does actually
return what is computed:
typedef unsigned __int128 U __attribute__((__vector_size__ (64)));
typedef unsigned __int128 V __attribute__((__vector_size__ (32)));
typedef unsigned __int128 W __attribute__((__vector_size__ (16)));

W
foo (U u, V v)
{
  return __builtin_shufflevector (u, v, 0);
}