# Function _mm_undefined_ph

Source

    pub fn _mm_undefined_ph() -> __m128h

🔬This is a nightly-only experimental API. (`stdarch_x86_avx512_f16` #127213)
Available on (x86 or x86-64) and target feature `avx512fp16,avx512vl` and x86 only.
Expand description

Return vector of type `__m128h` with indetermination elements. Despite using the word “undefined” (following Intel’s naming scheme), this non-deterministically picks some valid value and is not equivalent to `mem::MaybeUninit`. In practice, this is typically equivalent to `mem::zeroed`.

Intel’s documentation