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Sever Weather Update:

I recently came across a strange deoptimization (or rather missed optimization opportunity).

Consider this function for efficient unpacking of arrays of 3-bit integers to 8-bit integers. It unpacks 16 ints in each loop iteration:

void unpack3bit(uint8_t* target, char* source, int size) { while(size > 0){ uint64_t t = *reinterpret_cast<uint64_t*>(source); target[0] = t & 0x7; target[1] = (t >> 3) & 0x7; target[2] = (t >> 6) & 0x7; target[3] = (t >> 9) & 0x7; target[4] =

(t >> 12) & 0x

7; target[5] = (t >> 15) & 0x7; target[6] = (t >> 18) & 0x7; target[7] = (t >> 21) & 0x7; target[8] = (t >> 24) & 0x7; target[9] = (t >> 27) & 0x7; target[10]

= (t >> 30) & 0x7; target[11] = (t >> 33) & 0x7; target[12] = (t >> 36) & 0x7; target[13] = (t >> 39) & 0x7; target[14] = (t >> 42) & 0x7; target[15] = (t >> 45) & 0x7; source+=6; size-=6; target+=16; } }