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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: Bug on Pentium IOC |
| From: | Dirk Zimoch <[email protected]> |
| To: | Bernd Schoeneburg <[email protected]> |
| Cc: | TECHTALK <[email protected]> |
| Date: | Tue, 17 Dec 2002 13:40:41 +0100 |
Hi all, can anyone explain this:
~(~0UL << 32) is 0xFFFFFFFF on a Motorola VME162 i.e., which is correct the same on a Pentium is 0, which is false!
Ideas?
Bernd
The Pentium (and all Intel x86s, I think) does all shifts mod 32. Thus (~0 << 32) is not shifted at all. => ~(~0 << 32) = ~~0 = 0
-- Dr. Dirk Zimoch Swiss Light Source Paul Scherrer Institut Computing and Controls phone +41 56 310 5182 fax +41 56 310 4413