internals of autovectorization

[ranjith kumar <ranjit_kumar_b4u@xxxxxxxxxxx>]

Hi,
  I am trying to understand internals of
autovectorization.
  It is given that autovectorization sarts with 
      vectorize_loops(struct loops *loops) function in
tree-vectoriztion.c. I tried to understand the
definitions of 'struct loops' and 'struct loop'.
But much information is not given.
 Where can I find more  information????
For example struct loops is defined as:
 struct loops
  {
    /* Number of natural loops in the function.  */
    unsigned num;
.
.
.
. 

  /* Headers shared by multiple loops that should be
merged.  */
   sbitmap shared_headers;
  };

But I want to understand what exactly  is sbitmap and
to what it is pointing . How can I know that?

Thanks in advance.



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