Endianness vtbx

Hi @ all,

I have a 16 byte permutation mask uint8_t[16] and a 16 byte data array uint32_t[4]. I want to "shuffle" this data array using vtbx.

This is my code so far:

#include <arm_neon.h>
#include <iostream>

int main() {
    uint32_t* data32 = new uint32_t[4];
        data32[0] = 2570;
        data32[1] = 655370;
        data32[2] = 168430090;
        data32[3] = 10;
        //load structure
        uint32x4_t data32Vec = vld1q_u32(data32);
    uint8_t* sMask = new uint8_t[16];
        sMask[0] = 2;
        sMask[1] = 3;
        sMask[2] = 5;
        sMask[3] = 6;
        sMask[4] = 7;
        sMask[5] = 8;
        sMask[6] = 9;
        sMask[7] = 10;
        sMask[8] = 11;
        sMask[9] = 15;
        sMask[10] = 42;
        sMask[11] = 42;
        sMask[12] = 42;
        sMask[13] = 42;
        sMask[14] = 42;
        sMask[15] = 42;
        uint8x16_t shuffleMask = vld1q_u8(sMask); 
    uint8x8x2_t dataVec8x8x2;
        dataVec8x8x2.val[0] = vget_low_u8(vreinterpretq_u8_u32(data32Vec));
        dataVec8x8x2.val[1] = vget_high_u8(vreinterpretq_u8_u32(data32Vec));
    uint8_t* comprData1 = new uint8_t[8];
    uint8_t* comprData2 = new uint8_t[8];
    uint8x8_t target1, target2;
        target1 = vtbx2_u8(target1, dataVec8x8x2, vget_low_u8(shuffleMask));
        target2 = vtbx2_u8(target2, dataVec8x8x2, vget_high_u8(shuffleMask));
        vst1_u8(comprData1, target1);
        vst1_u8(comprData2, target2);
    for(int i = 0; i < 8; ++i) {
        std::cout << (unsigned)comprData1[i] << "   " << (unsigned)comprData2[i] <<std::endl;
    }
    
    delete[] comprData1;
    delete[] comprData2;
    delete[] sMask;
    delete[] data32;
    
    return 0;
}

The output looks like the following:

 0    10
 0     0
 0   162 #<-- this value [162] changes from everytime i run the code
10   190
 0     0
10     0
10     0
10     0

But it should look like that:

10  10
10  10
10   0
 0   0
10   0
10   0
10   0
10   0

I think it has something to do with endianness, but just don't see the problem. Does anyone has a hint?

Sincerely