[LLVMdev] Start column from DebugLoc of MachineInstr

[Pankaj Gode]

Hi,
 
1. Below code gives me end column number of the machine instruction. 
   How can I get the start column number ?
 
const MachineInstr *First;
..... //First is assigned.
DebugLoc MIDB = First->getDebugLoc();
col_begin  = MIDB.getCol(); 
 
2. -----------------
  If my C block is
    {
        int t = 10;
     }
  This gives me value 20, instead of 9. 
-----------------
 
3. In DebugLoc the getCol() method is defined as:
unsigned getCol()const {
       return LineCol >> 24;
}
Is the some other shifting required to get the start column number?

4. Though I see the information under DW_TAG_lexical_block in ".ll" file. Can I access this information using DebugLo?
 
 
Regards,
Pankaj
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