Function core::arch::x86_64::_mm_packs_epi16

pub unsafe fn _mm_packs_epi16(a: __m128i, b: __m128i) -> __m128i

This is supported on x86-64 and target feature sse2 only.

Converts packed 16-bit integers from a and b to packed 8-bit integers using signed saturation.

Intel's documentation