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SSE intstruction error

if a register has to be filled with data upto an arbitrary byte/word/dword position is it possible? for example:

if cnt = 0 or 1 or 2 or 3. how can the following be done

for (int i=0; i < cnt; i++)

{

Register = _mm_insert_epi32(Register, i);

Register1 = _mm_slli_si128(Register1, i);

}

Both are being dissallowed since i is required to be a constant value. Is there a workaround?

suppose at run time only two values are to be filled (cnt = 2).

Thanks

Deepak

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Highlighted
Moderator
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Try to avoid the "for" statement. so like below:

[cpp]switch (cnt)  { 
   case 1:
        Register  = _mm_insert_epi32(Register, 1); 
        Register1 = _mm_slli_si128(Register1, 1);
        break;
  case 2:
        Register  = _mm_insert_epi32(Register, 1); 
        Register1 = _mm_slli_si128(Register1, 1);
        //! Second loop instance
        Register  = _mm_insert_epi32(Register, 2); 
        Register1 = _mm_slli_si128(Register1, 2);
        break;
}

[/cpp]

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