Re: Re: [ZEND-ENGINE-CVS] cvs: ZendEngine2 / zend_operators.c

From:	Michael Walter	Date:	Sun, 22 Feb 2004 22:49:34 +0000
Subject:	Re: Re: [ZEND-ENGINE-CVS] cvs: ZendEngine2 / zend_operators.c
References:	1 2 3 4 5 6	Groups:	php.internals
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George Schlossnagle wrote:

On Feb 22, 2004, at 5:15 PM, Derick Rethans wrote:
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.
Doesn't the rval in modulus need to be unsigned? No, it's implementation-defined though if one of the operands is negative, IIRC.

Cheers, Michael