[Clp] CLP exception poped up when solving an LP

[usa usa]

After recompiled all libs, I got the exception same as the original one:

*       Unhandled exception at 0x00217A52 in MyApp.exe: 0xC0000005: Access
violation reading location 0x1BBEFFFC.*

even though I have defined USE_MEMCPY in CoinHelperFunctions.hpp and
disabled all compile optimization for speed for all Clp libs.

thanks

On Wed, May 18, 2016 at 9:45 AM, usa usa <usact2012 at gmail.com> wrote:

> Hi,
>
> I have defined USE_MEMCPY in CoinHelperFunctions.hpp and disabled all
> compile optimization for speed for all Clp libs. When I run myApp.exe in
> debug mode from Visual Studio 2013, I got error:
>
>
> *      Unhandled exception at 0x7541C54F in myApp.exe: Microsoft C++
> exception: [rethrow] at memory location 0x00000000.*
> which is different from last error.
>
> It seems that a NULL pointer is dereference ?
>
> Thanks,
>
>
>
> On Wed, May 18, 2016 at 3:56 AM, John Forrest <john.forrest at fastercoin.com
> > wrote:
>
>> Robert,
>>
>> I agree.  I use CoinMemcpyN which is same as CoinCopyN unless
>> -DUSE_MEMCPY defined when it uses memcpy - there is a remark at line 255 of
>> CoinHelperFunctions.hpp.  So try defining USE_MEMCPY in your configuration
>> and using CoinMemcpyN in your code.  If it still errors then it may be
>> easier to see what is wrong.
>>
>> John Forrest
>>
>> On 17/05/16 22:56, Lacroix, Robert wrote:
>>
>> This is just a memory copy. Why is Duff’s device being used here?
>>
>> Hasn’t Duff’s device been obsoleted by modern compilers and machine
>> architectures?
>>
>> Not even mentioning that the code might not work, depending on how tricky
>> the compiler tries to be about optimization.
>>
>>
>>
>> Try recompiling CLP with minimal compiler optimization and see if the
>> exception still happens.
>>
>> Then tell us about the result. It will be of special interest to those of
>> us that rely on CLP for decision support.
>>
>>
>>
>> Robert Lacroix
>>
>> Manitoba Hydro
>>
>>
>>
>> *From:* Clp [mailto:clp-bounces at coin-or.org <clp-bounces at coin-or.org>] *On
>> Behalf Of *usa usa
>> *Sent:* Friday, May 13, 2016 11:07 AM
>> *To:* clp at list.coin-or.org
>> *Subject:* [Clp] CLP exception poped up when solving an LP
>>
>>
>>
>> Hi, I am using CLP to solve an LP with
>>
>>    rowNum =  1002 and columNum = 6202  and totalElementNum = 6,214,404
>>
>>
>> In   *CoinCopyN* (register const T* from, const int size, register T*
>> to) called from CoinMemcpyN(ind,numels,index_), which is called from
>> gutsOfOpEqual(colordered, minor, major, numels, elem, ind, start, len);
>>
>> I got an exception:
>>
>>
>> *        Unhandled exception at 0x00217A52 in MyApp.exe: 0xC0000005:
>> Access  violation reading location 0x1BBEFFFC.*
>>
>> The exception poped up at
>>
>>     *case 2:         *--downto = *--downfrom;*
>>
>>
>> template <class T> inline void
>> *CoinCopyN* (register const T* from, const int size, register T* to)
>> {
>>     if (size == 0 || from == to)
>>     return;
>>
>> #ifndef NDEBUG
>>     if (size < 0)
>>     throw CoinError("trying to copy negative number of entries",
>>             "CoinCopyN", "");
>> #endif
>>
>>     register int n = (size + 7) / 8;  *// size = 6214404*
>>     if (to > from) {
>>     register const T* downfrom = from + size;
>>     register T* downto = to + size;
>>     // Use Duff's device to copy
>>     switch (size % 8) {
>>     case 0: do{     *--downto = *--downfrom;
>>     case 7:         *--downto = *--downfrom;
>>     case 6:         *--downto = *--downfrom;
>>     case 5:         *--downto = *--downfrom;
>>     case 4:         *--downto = *--downfrom;
>>     case 3:         *--downto = *--downfrom;
>> *    case 2:         *--downto = *--downfrom;  // exception poped up
>> here,*
>>     case 1:         *--downto = *--downfrom;
>>     }while(--n>0);
>>     }
>>
>> I do not understand why this happed ?
>>
>> I have used CLP to solve some large benchmark Lp models without problems.
>>
>> Any help would be appreciated.
>>
>>
>>
>> thanks!
>>
>>
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