pub unsafe fn _mm256_insertf128_si256(
    a: __m256i,
    b: __m128i,
    const IMM1: i32,
) -> __m256iAvailable on (x86 or x86-64) and target feature 
avx and x86-64 only.Expand description
Copies a to result, then inserts 128 bits from b into result
at the location specified by imm8.