Function core::arch::x86::_mm_cmpistra

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

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 1 if b did not contain a null character and the resulting mask was zero, and 0 otherwise.

Intel's documentation