Hello Jakub et al.,
I have a question regarding the parallel for implementation. I am
implementing _Cilk_for based on the routines in omp-low.c and I would like to
create a child function but would like to move the items that gimplify_omp_for
inserts in for_pre_body in the top-level function. I need to do this because in
_Cilk_for, we insert the body of the function into a child function and then we
call a builtin CilkPlus function called __cilkrts_cilk_for_64 and pass in the
child function's name, data pointer, loop-count and grain.
The loop count computation gets to be an issue in C++ when we use
iterator.
For example, if we have something like this:
Vector <int> array;
For (vector<int>::iterator iter = array.begin(); iter != array.end (); iter++)
gimplify_omp_for function gimplifys the condition expression (array.end ()) and
then inserts the following in pre_body....
iter = std::vector<int>::begin (&array);
D.28387 = std::vector<int>::end (&array);
try
{
retval.0 = __gnu_cxx::operator-<int*, std::vector<int> > (&D.28387, &iter);
}
finally
{
D.28387 = {CLOBBER};
}
..and moves it to the child function at a later stage (I believe in
lower_omp_for). I want to make it *NOT* do that and keep it in the current
function, since I want to use the retval.0. Can someone please suggest me how
to do that?
Any help is greatly appreciated!
Sincerely,
Balaji V. Iyer.
