NEON vs Intel SSE - equivalence of certain operations

I'm having some trouble figuring out the NEON equivalence of a couple of Intel SSE operations. It seems that NEON is not capable to handle an entire Q register at once(128 bit value data type). I haven't found anything in the arm_neon.h header or in the NEON intrinsics reference.

What I want to do is the following:

// Intel SSE
// shift the entire 128 bit value with 2 bytes to the right; this is done 
// without sign extension by shifting in zeros
__m128i val = _mm_srli_si128(vector_of_8_s16, 2);
// insert the least significant 16 bits of "some_16_bit_val"
// the whole thing in this case, into the selected 16 bit 
// integer of vector "val"(the 16 bit element with index 7 in this case)
val = _mm_insert_epi16(val, some_16_bit_val, 7);

I've looked at the shifting operations provided by NEON but could not find an equivalent way of doing the ab开发者_Python百科ove(I don't have much experience with NEON). Is it possible to do the above(I guess it is I just don't know how)? Any pointers greatly appreciated.

You want the VEXT instruction. Your example would look something like:

int16x8_t val = vextq_s16(vector_of_8_s16, another_vector_s16, 1);

After this, bits 0-111 of val will contain bits 16-127 of vector_of_8_s16, and bits 112-127 of val will contain bits 0-15 of another_vector_s16.