Dividing really big ulongs by each other doesn't seem to work at all.

---
void main() {
	ulong a = 10_000_000_000_000_000,
	      b =  1_000_000_000_000_000;

	assert (a / b == 10);
}
---

a / b is, according to writef, 9223372036854775818.

Confirmed:  _ULDIV appears to be faulty.


"Deewiant" <deewiant.doesnotlike.spam@gmail.com> wrote in message news:dn3old$hhr$1@digitaldaemon.com...
> Dividing really big ulongs by each other doesn't seem to work at all.
>
> ---
> void main() {
> ulong a = 10_000_000_000_000_000,
>       b =  1_000_000_000_000_000;
>
> assert (a / b == 10);
> }
> ---
>
> a / b is, according to writef, 9223372036854775818.

In article <dn4l2u$1joa$1@digitaldaemon.com>, Kris says...
>
>Confirmed:  _ULDIV appears to be faulty.
>
>
>"Deewiant" <deewiant.doesnotlike.spam@gmail.com> wrote in message news:dn3old$hhr$1@digitaldaemon.com...
>> Dividing really big ulongs by each other doesn't seem to work at all.
>>
>> ---
>> void main() {
>> ulong a = 10_000_000_000_000_000,
>>       b =  1_000_000_000_000_000;
>>
>> assert (a / b == 10);
>> }
>> ---
>>
>> a / b is, according to writef, 9223372036854775818.
>

There looks to be a problem with longs as well (__LDIV__).

Deewiant wrote:

> Dividing really big ulongs by each other doesn't seem to work at all.
> 
> ---
> void main() {
> 	ulong a = 10_000_000_000_000_000,
> 	      b =  1_000_000_000_000_000;
> 
> 	assert (a / b == 10);
> }
> ---
> 
> a / b is, according to writef, 9223372036854775818.

FWIW, Both "long" and "ulong" works fine with GDC

import std.stdio;

int main() {
        ulong a = 10_000_000_000_000_000,
              b =  1_000_000_000_000_000;

        assert (a / b == 10);
        debug writefln(a / b);

        long c = -42_000_000_000_000_000,
             d =   1_000_000_000_000_000;

        assert (c / d == -42);
        debug writefln(c / d);

        return 0;
}

prints:
10
42

--anders

> prints:
> 10
> 42

<duh> -42

--anders

"Deewiant" <deewiant.doesnotlike.spam@gmail.com> wrote in message news:dn3old$hhr$1@digitaldaemon.com...
> Dividing really big ulongs by each other doesn't seem to work at all.

Criminy! You're right. I have it fixed, it'll go out in the next update.

Deewiant schrieb am 2005-12-06:
> Dividing really big ulongs by each other doesn't seem to work at all.
>
> ---
> void main() {
> 	ulong a = 10_000_000_000_000_000,
> 	      b =  1_000_000_000_000_000;
>
> 	assert (a / b == 10);
> }
> ---
>
> a / b is, according to writef, 9223372036854775818.

Added to DStress as http://dstress.kuehne.cn/run/o/opDiv_13_A1.d http://dstress.kuehne.cn/run/o/opDiv_13_A2.d http://dstress.kuehne.cn/run/o/opDiv_13_B1.d http://dstress.kuehne.cn/run/o/opDiv_13_B2.d http://dstress.kuehne.cn/run/o/opDiv_13_C1.d http://dstress.kuehne.cn/run/o/opDiv_13_C2.d http://dstress.kuehne.cn/run/o/opDiv_13_D1.d http://dstress.kuehne.cn/run/o/opDiv_13_D2.d

Thomas