rr_graph_util.c

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#include "util.h"
#include "vpr_types.h"
#include "globals.h"
#include "rr_graph_util.h"

t_linked_edge *
insert_in_edge_list(INP t_linked_edge * head, INP int edge, INP short iswitch) {

    /* Inserts a new element at the head of a linked list.  Returns the new head *
     * of the list.  One argument is the address of the head of a list of free   *
     * edge_list elements.  If there are any elements on this free list, the new *
     * element is taken from it.  Otherwise a new one is malloced.               */

    t_linked_edge *linked_edge;

    linked_edge = (t_linked_edge *) my_malloc(sizeof(t_linked_edge));

    linked_edge->edge = edge;
    linked_edge->iswitch = iswitch;
    linked_edge->next = head;

    return linked_edge;
}

#if 0
void
free_linked_edge_soft(INOUT t_linked_edge * edge_ptr,
        INOUT t_linked_edge ** free_list_head_ptr)
{

    /* This routine does a soft free of the structure pointed to by edge_ptr by *
     * adding it to the free list.  You have to pass in the address of the      *
     * head of the free list.                                                   */

    edge_ptr->next = *free_list_head_ptr;
    *free_list_head_ptr = edge_ptr;
}
#endif

int seg_index_of_cblock(t_rr_type from_rr_type, int to_node) {

    /* Returns the segment number (distance along the channel) of the connection *
     * box from from_rr_type (CHANX or CHANY) to to_node (IPIN).                 */

    if (from_rr_type == CHANX)
        return (rr_node[to_node].xlow);
    else
        /* CHANY */
        return (rr_node[to_node].ylow);
}

int seg_index_of_sblock(int from_node, int to_node) {

    /* Returns the segment number (distance along the channel) of the switch box *
     * box from from_node (CHANX or CHANY) to to_node (CHANX or CHANY).  The     *
     * switch box on the left side of a CHANX segment at (i,j) has seg_index =   *
     * i-1, while the switch box on the right side of that segment has seg_index *
     * = i.  CHANY stuff works similarly.  Hence the range of values returned is *
     * 0 to nx (if from_node is a CHANX) or 0 to ny (if from_node is a CHANY).   */

    t_rr_type from_rr_type, to_rr_type;

    from_rr_type = rr_node[from_node].type;
    to_rr_type = rr_node[to_node].type;

    if (from_rr_type == CHANX) {
        if (to_rr_type == CHANY) {
            return (rr_node[to_node].xlow);
        } else if (to_rr_type == CHANX) {
            if (rr_node[to_node].xlow > rr_node[from_node].xlow) { /* Going right */
                return (rr_node[from_node].xhigh);
            } else { /* Going left */
                return (rr_node[to_node].xhigh);
            }
        } else {
            vpr_printf(TIO_MESSAGE_ERROR, "in seg_index_of_sblock: to_node %d is of type %d.\n",
                    to_node, to_rr_type);
            exit(1);
        }
    }
    /* End from_rr_type is CHANX */
    else if (from_rr_type == CHANY) {
        if (to_rr_type == CHANX) {
            return (rr_node[to_node].ylow);
        } else if (to_rr_type == CHANY) {
            if (rr_node[to_node].ylow > rr_node[from_node].ylow) { /* Going up */
                return (rr_node[from_node].yhigh);
            } else { /* Going down */
                return (rr_node[to_node].yhigh);
            }
        } else {
            vpr_printf(TIO_MESSAGE_ERROR, "in seg_index_of_sblock: to_node %d is of type %d.\n",
                    to_node, to_rr_type);
            exit(1);
        }
    }
    /* End from_rr_type is CHANY */
    else {
        vpr_printf(TIO_MESSAGE_ERROR, "in seg_index_of_sblock: from_node %d is of type %d.\n",
                from_node, from_rr_type);
        exit(1);
    }
}