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Forum: Operation Billion Digits 2005-11-09, 15:40
Replies: 27
Views: 20,903
Posted By jasonp
These algorithms can be especially useful on the...

These algorithms can be especially useful on the G4, where an integer modmul would have excruciating latency. Let me know if you'd be interested in a vectorized version that uses software pipelining....
Forum: Operation Billion Digits 2005-11-09, 13:59
Replies: 27
Views: 20,903
Posted By jasonp
My understanding is that the result is always...

My understanding is that the result is always exact. if a + b makes the full 100-bit product, and 'a' is implicitly the 'high half', then if 'a' is too large by one then b is negative. Remember that...
Forum: Operation Billion Digits 2005-11-08, 13:57
Replies: 27
Views: 20,903
Posted By jasonp
There's another handy trick on PPC hardware, in...

There's another handy trick on PPC hardware, in case you haven't considered it: For <= 50-bit integers in FPU registers a and b, c = a * b and d = (c - a*b) yield a pair of values where c + d = the...
Showing results 1 to 3 of 3

 
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