... > On 32-bit platforms --- i386 in particular --- the 64-bit division > results in an out-of-line call to a helper function that is not > supplied in the kernel compilation environment, so not only is it > slower, it Just Doesn't Work. Even on some 64-bit systems a 64bit divide can be significantly slower than a 32-bit divide - even with the same arguments. IIRC Intel x86-64 a 64-bit divide (128-bit dividend) is about twice the clocks of a 32-bit one. On AMD cpu they are much the same. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
