fn __subhf3(a: f16, b: f16) callconv(.c) f16
fn __subhf3(a: f16, b: f16) callconv(.c) f16 { const neg_b = @as(f16, @bitCast(@as(u16, @bitCast(b)) ^ (@as(u16, 1) << 15))); return addf3(f16, a, neg_b); }