64位整数内素数筛法世界最快，如果有更快全面超越我的，请通知我领取500RMB奖励。
MINGW: gcc 4.7.3
CXXFLAG:g++ -march=native [-DW210,-DSAFE=1] -funroll-loops -O3 -s -pipe;
Windows 7 x64, AMD X4 641 2.8G / Intel i3 350M 2.26G
pi(1e11, 1e11+1e10) = 394050419 4.54 / 5.25
pi(1e12, 1e12+1e10) = 361840208 5.56 / 6.31
pi(1e13, 1e13+1e10) = 334067230 7.03 / 7.66
pi(1e14, 1e14+1e10) = 310208140 8.74 / 9.49
pi(1e15, 1e15+1e10) = 289531946 10.42/11.41
pi(1e16, 1e16+1e10) = 271425366 12.15/13.35
pi(1e17, 1e17+1e10) = 255481287 14.28/15.58
pi(1e18, 1e18+1e10) = 241272176 17.50/18.95
pi(1e19, 1e19+1e10) = 228568014 24.20/25.60
pi(1e18, 1e18+1e6) = 24280 1.16/0.72
pi(1e18, 1e18+1e8) = 2414886 1.80/1.54
pi(1e18, 1e18+1e9) = 24217085 3.81/3.80
pi(1e18, 1e18+1e12)= 24127637783 1546/1640
pi(1e16, 1e16+1e12)= 27143405794 1166/1310
pi(1e14, 1e14+1e12)= 31016203073 880 /
