GMP-ECM 6.3.1 SVN 1582 optimized for core2 64bit.
Built and tested on a penryn: "Core2Quad (Yorksfield) Q9450 2.66Ghz" with Windows 7 64bit and Msys + Mingw64.
B1=1,000,000 B2=1,000,000,000
B1=3,000,000 B2=6,000,000,000
B1=11,000,000 B2=40,000,000,000
The testtimes: