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creating 128-bit integer

Started by Eric_B Jul 11, 2003 at 2:14 PM 9 replies 1k views

Original Post

26

Jul 11, 2003 at 2:14 PM

I need 128-bit integer, how do I make that? thanks in advance

297

Jul 11, 2003 at 2:20 PM

You don''t get a 128-bit integer. Instead, you simulate it with a big-integer class. Google for it.

How appropriate. You fight like a cow.

14

Jul 11, 2003 at 6:36 PM

or buy an Itanium

63

Jul 11, 2003 at 8:01 PM

An Itanium (and Opteron) is only 64 bits

6

Jul 11, 2003 at 8:22 PM

So buy two of them. ;-)

139

Jul 11, 2003 at 8:39 PM

MMX and SSE i think use 128-bit registers... but that really wont help much, since its just the register size....

14

Jul 12, 2003 at 6:52 AM

You may declare a lon int in an IA64, and if you are using a gnu gcc compiler it will create you a 128 bit integer.

9

Jul 12, 2003 at 8:28 AM

Don''t know much about it, but can''t u use two long ints, and multiply(not thinking) them?

Author

26

Jul 13, 2003 at 8:17 PM

"Don''t know much about it, but can''t u use two long ints, and multiply(not thinking) them?"

don''t know what you mean, but if I multiply to 10 digit long ints, it buffer overruns.

163

Jul 13, 2003 at 10:58 PM

If you dont want to impliment a large integer class yourself you could use GNU MP

Qui fut tout, et qui ne fut rien
Invader''s Realm

2

Jul 14, 2003 at 6:17 AM

What do you need that large of an integer for?
Most likely a better solution would be to change your algorithm.

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