source is from
http://developers.sun.com/solaris/articles/ILP32toLP64Issues.html
and
http://www.unix.org/whitepapers/64bit.html
there are several kind of data type mode
| Data Type | LP32 | ILP32 | ILP64 | LLP64 | LP64 |
|---|---|---|---|---|---|
| char | 8 | 8 | 8 | 8 | 8 |
| short | 16 | 16 | 16 | 16 | 16 |
| int32 | 32 | ||||
| int | 16 | 32 | 64 | 32 | 32 |
| long | 32 | 32 | 64 | 32 | 64 |
| long long (int64) | 64 | ||||
| pointer | 32 | 32 | 64 | 64 | 64 |
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