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Faradd optimization

squall, AMD Opteron 8220 @ 2.8 GHz
gcc 4.5.2 gcc 4.6.3 icc 12.1.3
loop 117300 117500 100700
sse2 intrinsics 103800 105700 100200
4 times unrolled, sse2 intrinsics 103500 101200 99500
wanglung, INTEL Xeon E5520 @ 2.3 GHz
gcc 4.5.3 gcc 4.6.3 gcc 4.7.0
loop 53300 51500 51300
sse2 intrinsics 45500 44000 44100
4 times unrolled, sse2 intrinsics 44500 41000 43000