```
$ ./loopunroll
N= 1000000
scalar
instructions per cycle 4.35, cycles per pair of 32-bit words:  1.610, instructions per pair of 32-bit words: 7.000
min:  1609987 cycles,  7000026 instructions, 	       2 branch mis.,   262935 cache ref.,    22588 cache mis.
avg: 1641380.1 cycles, 7000026.1 instructions, 	     2.2 branch mis., 265557.8 cache ref.,  27655.8 cache mis.
sum = 13106436852605896768
scalar2
instructions per cycle 3.99, cycles per pair of 32-bit words:  1.380, instructions per pair of 32-bit words: 5.500
min:  1380106 cycles,  5500032 instructions, 	       2 branch mis.,   262204 cache ref.,    23330 cache mis.
avg: 1408077.4 cycles, 5500032.1 instructions, 	     2.3 branch mis., 267110.9 cache ref.,  25404.1 cache mis.
sum = 13106436852605896768
scalar4
instructions per cycle 3.89, cycles per pair of 32-bit words:  1.286, instructions per pair of 32-bit words: 5.000
min:  1286232 cycles,  5000042 instructions, 	       2 branch mis.,   264035 cache ref.,    22834 cache mis.
avg: 1298172.8 cycles, 5000042.1 instructions, 	     2.3 branch mis., 266240.3 cache ref.,  24072.1 cache mis.
sum = 13106436852605896768
```
