Function core_arch::x86::_mm_cmpistrm

pub unsafe fn _mm_cmpistrm(a: __m128i, b: __m128i, imm8: i32) -> __m128i

This is supported on x86 and target feature sse4.2 only.

Compares packed strings with implicit lengths in a and b using the control in imm8, and return the generated mask.

Intel's documentation