Re: double val to long val conversion issue
| From: | Stas Malyshev | Date: | Wed, 20 Feb 2013 08:15:18 +0000 |
| Subject: | Re: double val to long val conversion issue | ||
| References: | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-66023@lists.php.net to get a copy of this message | ||
Hi!
>> Also, I'm not sure I understand what 64-bit test is supposed to return
>> and why - why negative number is converted to positive one? What exactly
>> this change is supposed to improve?
>
> The least significant bytes are preserved. Take int(-2056257536) and
> int(2943463994971652096):
>
> In[6]:= BitAnd[2^32 - 1, {-2056257536, 2943463994971652096}]
>
> Out[6]= {2238709760, 2238709760}
I'm not sure I understand, what this syntax means and how it explains
why we're doing these conversions? I.e. what requires this change and
how it is beneficial? I understand that it preserves least significant
bits, but why we should preserve them and discard sign, for example?
--
Stanislav Malyshev, Software Architect
SugarCRM: http://www.sugarcrm.com/
(408)454-6900 ext. 227