Re: Re: [ZEND-ENGINE-CVS] cvs: ZendEngine2 / zend_operators.c
| From: | Derick Rethans | Date: | Sun, 22 Feb 2004 22:15:49 +0000 |
| Subject: | Re: Re: [ZEND-ENGINE-CVS] cvs: ZendEngine2 / zend_operators.c | ||
| References: | 1 2 3 4 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-8065@lists.php.net to get a copy of this message | ||
On Sun, 22 Feb 2004 cm@leetspeak.org wrote:
> It's generating an idivl, which gives you an exception if the (signed)
> result is too large (a.k.a. integer overflow).
>
> Did you notice your compiler warning "this decimal constant is unsigned
> only in ISO C90"? ;)
Yes I did
> +2147483648 is: 10000000 00000000 00000000 00000000.
> -2147483648 is too large to be represented by a signed integer (as it
> would be ~(+2147483648) + 1,
No, -2147483648 is the lower bound and 2147483647 is the upper bound for
signed integers.
-2147483648 = 10000000000000000000000000000000
2147483647 = 01111111111111111111111111111111
it still doesn't explain the FPE here. What does explain it is that
-2147483648 / -1 = 2147483648 which is too large.
Derick