[Bug optimization/14863] [3.4/3.5 regression] unit-at-a-time causes miscompilation

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-04-07 13:06 -------
Here is the backtrace I get with the mainline at -O1 -g -funit-at-a-time --param large-function-
insns=3000:

#0  0x4207af5c in chunk_free () from /lib/i686/libc.so.6
#1  0x4207acb4 in free () from /lib/i686/libc.so.6
#2  0x400bf761 in operator delete (ptr=0x4212e0f0)
    at /home/gates/pinskia/src/gnu/gcc/src/libstdc++-v3/libsupc++/del_op.cc:39
#3  0x0805faa3 in ~PatchSwapLayout (this=0xbffec080) at pr14863.cc:9943  <-- not right function 
name
#4  0x080539ff in main (argc=1, argv=0xbffec194) at pr14863.cc:52762



I think this is related to some pointer :
 char *tmp = new char[nsize];
 pBeginNew = reinterpret_cast<T *>(tmp);


 char *tmp = reinterpret_cast<char *>(pBegin_m);
 delete [] tmp;  <--- crashing here

I do not understand why the code is doing this though as you should be just using new T[newsize] 
instead.  The other thing is that you could be over running the buffer which could cause this problem.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[3.4 regression] unit-at-a- |[3.4/3.5 regression] unit-
                   |time causes miscompilation  |at-a-time causes
                   |                            |miscompilation


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14863