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C:\test\C>gcm
anonyM: gcm for s=2147483648 & r=1 to 1073741824 took: 33.607916866993
+ 
oiskuu: gcm for s=2147483648 & r=1 to 1073741824 took:329.551997991197

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void main( int argc, char **argv ) {
    U64 s = argc > 1 ? _atoi64( argv[ 1 ] ) : 2*GB;
...
    return;
}