I love Microsoft as much as I love wasting hours of my time trying to figure out something like ohh you add -s then it just works. The best part about using Visual Studio is that the STL has minor bugs. Like insert a million random integers into a list and sort now you have 100 thousand. Or run clear and size on a vector several times then push_back then clear and size a bunch of times and repeat then incomprehensible run time error "vector iterators incompatible". So I replaced vector with a struct "vectorThatWorks" with pointer to data, count, and total. Hey it works, but the best error ever VS 2010 Express compiled my code incorrectly. It's a new twist to compile error. I know for a fact it is not my fault this time. Since the assembly dump is long and boring I cut it off after "tmp << 17" because they were exactly the same from then on.
Broken code:// Output tmp = rows.data[a - 1].column; binBuffOut.put((unsigned int) ((tmp << 17) / 50529455839), 17); Address Hex dump Command 00E416E1 8B55 EC MOV EDX,DWORD PTR SS:[EBP-14] 00E416E4 03D2 ADD EDX,EDX *** load 64 bit int into ECX:EAX??? *** 00E416E6 8B44D1 F0 MOV EAX,DWORD PTR DS:[EDX*8+ECX-10] 00E416EA 8B4C0A F4 MOV ECX,DWORD PTR DS:[ECX+EDX-0C] <<< WTF? shouldn't this be [EDX*8+ECX-0C] *** load 64 bit int into ECX:EAX??? *** 00E416EE 0FA4C1 11 SHLD ECX,EAX,11 ...
Working code:
// Output
tmp = rows.data[a - 1].column;
if (tmp >= 50529455839) // never will happen but I don't know what else it could be
{
tmp = 0; // simplified for assembly dump
// fprintf(stderr, "rows.data >= 50529455839\n");
// exit(1);
}
binBuffOut.put((unsigned int) ((tmp << 17) / 50529455839), 17);
Address Hex dump Command
00B916E1 8B4D EC MOV ECX,DWORD PTR SS:[EBP-14]
00B916E4 03C9 ADD ECX,ECX
*** load 64 bit int into ECX:EAX ***
00B916E6 8B44CA F0 MOV EAX,DWORD PTR DS:[ECX*8+EDX-10]
00B916EA 8B4CCA F4 MOV ECX,DWORD PTR DS:[ECX*8+EDX-0C] <<< Weird who knew that a 64 bit int be stored as a 64 bit int
*** load 64 bit int into ECX:EAX ***
00B916EE 83F9 0B CMP ECX,0B
00B916F1 72 0D JB SHORT 00B91700
00B916F3 77 07 JA SHORT 00B916FC
00B916F5 3D DF4ECAC3 CMP EAX,C3CA4EDF
00B916FA 72 04 JB SHORT 00B91700
00B916FC 33C0 XOR EAX,EAX
00B916FE 33C9 XOR ECX,ECX
00B91700 0FA4C1 11 SHLD ECX,EAX,11
...