https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116331
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note this is not excessive precision. But rather the cos library implementation
and the constant folding implementation produces slightly different answer.
they differ by 1ulp.
__builtin_printf("%a %a\n", z, y);
0x1.453e098c304bp-2 0x1.453e098c304afp-2
