Alternative using mmx
Type represents 8 by 8bit integers
n
Iu8vec8 *v1,*v2,*v3;
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int i,j,k;
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for(i=0;i<31;i++){
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*v3=(*v1++)+(*v2++);
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v3++;
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}
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_mm_empty();
Indicates MMX regs are now free