Optimization problem: bulk Boolean operations on vectors

[Stefan Koch via Digitalmars-d]

On Saturday, 24 December 2016 at 01:38:24 UTC, safety0ff wrote:
> On Friday, 23 December 2016 at 22:11:31 UTC, Walter Bright 
> wrote:
>>
>> For this D code:
>>
>> enum SIZE = 100000000;
>>
>> void foo(int* a, int* b) {
>>     int* atop = a + 1000;
>>     ptrdiff_t offset = b - a;
>>     for (; a < atop; ++a)
>> 	*a &= *(a + offset);
>> }
>
> Is subtraction of pointers which do not belong to the same 
> array defined behavior in D?

Yes, I think so.
There are not crazy rules to make pointer math ub.