Add functions to p_tb_type for checking if it's root or primitive

libs/libarchfpga/src/arch_util.cpp

@@ -1077,7 +1077,7 @@ bool pb_type_contains_blif_model(const t_pb_type* pb_type, const std::string& bl
 
     if (pb_type->blif_model != nullptr) {
         //Leaf pb_type
-        VTR_ASSERT(pb_type->num_modes == 0);
+        VTR_ASSERT(pb_type->is_primitive());
         if (blif_model_name == pb_type->blif_model
             || ".subckt " + blif_model_name == pb_type->blif_model) {
             return true;

libs/libarchfpga/src/physical_types.h

@@ -1068,6 +1068,25 @@ struct t_pb_type {
     t_pb_type_power* pb_type_power = nullptr;
 
     t_metadata_dict meta;
+
+    /**
+     * @brief Check if t_pb_type is the root of the pb graph. Root pb_types correspond to a single top level block type and map to a particular type
+     * of location in the FPGA device grid (e.g. Logic, DSP, RAM etc.)
+     *
+     * @return if t_pb_type is root ot not
+     */
+    inline bool is_root() const {
+        return parent_mode == nullptr;
+    }
+
+    /**
+     * @brief Check if t_pb_type is a primitive block or equivalently a leaf of the pb graph.
+     *
+     * @return if t_pb_type is primitive/leaf ot not
+     */
+    inline bool is_primitive() const {
+        return num_modes == 0;
+    }
 };
 
 /** Describes an operational mode of a clustered logic block
@@ -1353,7 +1372,7 @@ class t_pb_graph_node {
     t_interconnect_pins** interconnect_pins; /* [0..num_modes-1][0..num_interconnect_in_mode] */
 
     // Returns true if this pb_graph_node represents a primitive type (primitives have 0 modes)
-    bool is_primitive() const { return this->pb_type->num_modes == 0; }
+    bool is_primitive() const { return this->pb_type->is_primitive(); }
 
     // Returns true if this pb_graph_node represents a root graph node (ex. clb)
     bool is_root() const { return this->parent_pb_graph_node == nullptr; }
@@ -1567,7 +1586,7 @@ enum e_directionality {
 };
 
 /* X_AXIS: Data that describes an x-directed wire segment (CHANX)                     *
- * Y_AXIS: Data that describes an y-directed wire segment (CHANY)                     *     
+ * Y_AXIS: Data that describes an y-directed wire segment (CHANY)                     *
  * BOTH_AXIS: Data that can be applied to both x-directed and y-directed wire segment */
 enum e_parallel_axis {
     X_AXIS,
@@ -1624,65 +1643,65 @@ enum e_Fc_type {
  */
 struct t_segment_inf {
     /**
-     *  @brief The name of the segment type 
+     *  @brief The name of the segment type
      */
     std::string name;
 
     /**
-     *  @brief ratio of tracks which are of this segment type. 
+     *  @brief ratio of tracks which are of this segment type.
      */
     int frequency;
 
     /**
-     *  @brief Length (in clbs) of the segment. 
+     *  @brief Length (in clbs) of the segment.
      */
     int length;
 
     /**
-     *  @brief Index of the switch type that connects other wires to this segment. 
-     * Note that this index is in relation to the switches from the architecture file, 
-     * not the expanded list of switches that is built at the end of build_rr_graph. 
+     *  @brief Index of the switch type that connects other wires to this segment.
+     * Note that this index is in relation to the switches from the architecture file,
+     * not the expanded list of switches that is built at the end of build_rr_graph.
      */
     short arch_wire_switch;
 
     /**
-     *  @brief Index of the switch type that connects output pins to this segment. 
-     * Note that this index is in relation to the switches from the architecture file, 
-     * not the expanded list of switches that is built at the end of build_rr_graph. 
+     *  @brief Index of the switch type that connects output pins to this segment.
+     * Note that this index is in relation to the switches from the architecture file,
+     * not the expanded list of switches that is built at the end of build_rr_graph.
      */
     short arch_opin_switch;
 
     /**
-     *  @brief Same as arch_wire_switch but used only for decremental tracks if it is 
-     * specified in the architecture file. If -1, this value was not set in the 
-     * architecture file and arch_wire_switch should be used for "DEC_DIR" wire segments. 
+     *  @brief Same as arch_wire_switch but used only for decremental tracks if it is
+     * specified in the architecture file. If -1, this value was not set in the
+     * architecture file and arch_wire_switch should be used for "DEC_DIR" wire segments.
      */
     short arch_wire_switch_dec = -1;
 
     /**
-     *  @brief Same as arch_opin_switch but used only for decremental tracks if 
-     * it is specified in the architecture file. If -1, this value was not set in 
-     * the architecture file and arch_opin_switch should be used for "DEC_DIR" wire segments. 
+     *  @brief Same as arch_opin_switch but used only for decremental tracks if
+     * it is specified in the architecture file. If -1, this value was not set in
+     * the architecture file and arch_opin_switch should be used for "DEC_DIR" wire segments.
      */
     short arch_opin_switch_dec = -1;
 
     /**
-     *  @brief Index of the switch type that connects output pins (OPINs) to this 
-     * segment from another die (layer). Note that this index is in relation to 
-     * the switches from the architecture file, not the expanded list of switches 
-     * that is built at the end of build_rr_graph. 
+     *  @brief Index of the switch type that connects output pins (OPINs) to this
+     * segment from another die (layer). Note that this index is in relation to
+     * the switches from the architecture file, not the expanded list of switches
+     * that is built at the end of build_rr_graph.
      */
     short arch_inter_die_switch = -1;
 
     /**
-     *  @brief The fraction of logic blocks along its length to which this segment can connect. 
-     * (i.e. internal population). 
+     *  @brief The fraction of logic blocks along its length to which this segment can connect.
+     * (i.e. internal population).
      */
     float frac_cb;
 
     /**
-     *  @brief The fraction of the length + 1 switch blocks along the segment to which the segment can connect. 
-     * Segments that aren't long lines must connect to at least two switch boxes. 
+     *  @brief The fraction of the length + 1 switch blocks along the segment to which the segment can connect.
+     * Segments that aren't long lines must connect to at least two switch boxes.
      */
     float frac_sb;
 
@@ -1699,27 +1718,27 @@ struct t_segment_inf {
     enum e_directionality directionality;
 
     /**
-     *  @brief Defines what axis the segment is parallel to. See e_parallel_axis 
-     * comments for more details on the values. 
+     *  @brief Defines what axis the segment is parallel to. See e_parallel_axis
+     * comments for more details on the values.
      */
     enum e_parallel_axis parallel_axis;
 
     /**
-     *  @brief A vector of booleans indicating whether the segment can connect to a logic block. 
+     *  @brief A vector of booleans indicating whether the segment can connect to a logic block.
      */
     std::vector<bool> cb;
 
     /**
-     *  @brief A vector of booleans indicating whether the segment can connect to a switch block. 
+     *  @brief A vector of booleans indicating whether the segment can connect to a switch block.
      */
     std::vector<bool> sb;
 
     /**
      *  @brief The index of the segment as stored in the appropriate Segs list.
-     * Upon loading the architecture, we use this field to keep track of the 
-     * segment's index in the unified segment_inf vector. This is useful when 
-     * building the rr_graph for different Y & X channels in terms of track 
-     * distribution and segment type. 
+     * Upon loading the architecture, we use this field to keep track of the
+     * segment's index in the unified segment_inf vector. This is useful when
+     * building the rr_graph for different Y & X channels in terms of track
+     * distribution and segment type.
      */
     int seg_index;
 
@@ -1728,7 +1747,7 @@ struct t_segment_inf {
      *  Possible values are:
      *   - GENERAL: The segment is part of the general routing resources.
      *   - GCLK: The segment is part of the global routing network.
-     * For backward compatibility, this attribute is optional. If not specified, 
+     * For backward compatibility, this attribute is optional. If not specified,
      * the resource type for the segment is considered to be GENERAL.
      */
     enum SegResType res_type = SegResType::GENERAL;
@@ -1778,12 +1797,12 @@ constexpr std::array<const char*, size_t(SwitchType::NUM_SWITCH_TYPES)> SWITCH_T
 
 /* Constant/Reserved names for switches in architecture XML
  * Delayless switch:
- *   The zero-delay switch created by VPR internally 
+ *   The zero-delay switch created by VPR internally
  *   This is a special switch just to ease CAD algorithms
  *   It is mainly used in
- *     - the edges between SOURCE and SINK nodes in routing resource graphs  
+ *     - the edges between SOURCE and SINK nodes in routing resource graphs
  *     - the edges in CLB-to-CLB connections (defined by <directlist> in arch XML)
- *   
+ *
  */
 constexpr const char* VPR_DELAYLESS_SWITCH_NAME = "__vpr_delayless_switch__";
 

libs/libarchfpga/src/read_xml_arch_file.cpp

@@ -1415,7 +1415,7 @@ static void ProcessPb_Type(pugi::xml_node Parent,
         pb_type->pb_type_power->leakage_default_mode = 0;
         int mode_idx = 0;
 
-        if (pb_type->num_modes == 0) {
+        if (pb_type->is_primitive()) {
             /* The pb_type operates in an implied one mode */
             pb_type->num_modes = 1;
             pb_type->modes = new t_mode[pb_type->num_modes];

vpr/src/analytical_place/flat_placement_mass_calculator.cpp

@@ -68,7 +68,7 @@ static PrimitiveVector calc_pb_type_capacity(const t_pb_type* pb_type) {
     // capacities as if the pb could choose either one.
     PrimitiveVector capacity;
     // If this is a leaf / primitive, create the base PrimitiveVector capacity.
-    if (pb_type->num_modes == 0) {
+    if (pb_type->is_primitive()) {
         LogicalModelId model_id = pb_type->model_id;
         VTR_ASSERT(model_id.is_valid());
         capacity.add_val_to_dim(get_model_mass(model_id), (size_t)model_id);

vpr/src/base/netlist_walker.cpp

@@ -42,7 +42,7 @@ void NetlistWalker::walk_blocks(const t_pb_routes& top_pb_route, const t_pb* pb)
 
     //Recurse
     const t_pb_type* pb_type = pb->pb_graph_node->pb_type;
-    if (pb_type->num_modes > 0) {
+    if (!pb_type->is_primitive()) {
         const t_mode* mode = &pb_type->modes[pb->mode];
         for (int i = 0; i < mode->num_pb_type_children; i++) {
             for (int j = 0; j < mode->pb_type_children[i].num_pb; j++) {

vpr/src/base/read_netlist.cpp

@@ -463,7 +463,7 @@ static void processPb(pugi::xml_node Parent, const ClusterBlockId index, t_pb* p
         VTR_ASSERT(clb_nlist->block_ports(index).size() == (unsigned)pb_type->num_ports);
     }
 
-    if (pb_type->num_modes == 0) {
+    if (pb_type->is_primitive()) {
         /* A primitive type */
         AtomBlockId blk_id = atom_ctx.netlist().find_block(pb->name);
         if (!blk_id) {

vpr/src/draw/intra_logic_block.cpp

@@ -202,8 +202,8 @@ static int draw_internal_find_max_lvl(const t_pb_type& pb_type) {
     t_mode mode;
     int max_levels = 0;
 
-    /* If no modes, we have reached the end of pb_graph */
-    if (pb_type.num_modes == 0)
+    /* If pb_type is a primitive, we have reached the end of pb_graph */
+    if (pb_type.is_primitive())
         return (pb_type.depth);
 
     for (i = 0; i < pb_type.num_modes; ++i) {
@@ -221,30 +221,25 @@ static int draw_internal_find_max_lvl(const t_pb_type& pb_type) {
  * calls helper function to compute bounding box values.
  */
 static void draw_internal_load_coords(int type_descrip_index, t_pb_graph_node* pb_graph_node, float parent_width, float parent_height) {
-    int i, j, k;
-    t_pb_type* pb_type;
-    int num_modes, num_children, num_pb;
-    t_mode mode;
     float blk_width = 0.;
     float blk_height = 0.;
 
-    /* Get information about the pb_type */
-    pb_type = pb_graph_node->pb_type;
-    num_modes = pb_type->num_modes;
-
-    /* If no modes, we have reached the end of pb_graph */
-    if (num_modes == 0)
+    t_pb_type* pb_type = pb_graph_node->pb_type;
+    int num_modes = pb_type->num_modes;
+    /* If pb_type is primitive, we have reached the end of pb_graph */
+    if (pb_type->is_primitive()) {
         return;
+    }
 
-    for (i = 0; i < num_modes; ++i) {
-        mode = pb_type->modes[i];
-        num_children = mode.num_pb_type_children;
+    for (int i = 0; i < num_modes; ++i) {
+        t_mode mode = pb_type->modes[i];
+        int num_children = mode.num_pb_type_children;
 
-        for (j = 0; j < num_children; ++j) {
+        for (int j = 0; j < num_children; ++j) {
             /* Find the number of instances for each child pb_type. */
-            num_pb = mode.pb_type_children[j].num_pb;
+            int num_pb = mode.pb_type_children[j].num_pb;
 
-            for (k = 0; k < num_pb; ++k) {
+            for (int k = 0; k < num_pb; ++k) {
                 /* Compute bound box for block. Don't call if pb_type is root-level pb. */
                 draw_internal_calc_coords(type_descrip_index,
                                           &pb_graph_node->child_pb_graph_nodes[i][j][k],
@@ -721,7 +716,7 @@ t_pb* highlight_sub_block_helper(const ClusterBlockId clb_index, t_pb* pb, const
     // and if pb is dud
     if (pb_type->depth + 1 > max_depth
         || pb->child_pbs == nullptr
-        || pb_type->num_modes == 0) {
+        || pb_type->is_primitive()) {
         return nullptr;
     }
 

vpr/src/pack/cluster_legalizer.cpp

@@ -65,7 +65,7 @@ static void check_cluster_atom_blocks(t_pb* pb, std::unordered_set<AtomBlockId>&
     const AtomContext& atom_ctx = g_vpr_ctx.atom();
 
     const t_pb_type* pb_type = pb->pb_graph_node->pb_type;
-    if (pb_type->num_modes == 0) {
+    if (pb_type->is_primitive()) {
         /* primitive */
         AtomBlockId blk_id = atom_pb_lookup.pb_atom(pb);
         if (blk_id) {
@@ -396,7 +396,7 @@ static bool primitive_memory_sibling_feasible(const AtomBlockId blk_id, const t_
 static bool primitive_feasible(const AtomBlockId blk_id, t_pb* cur_pb, const AtomPBBimap& atom_to_pb) {
     const t_pb_type* cur_pb_type = cur_pb->pb_graph_node->pb_type;
 
-    VTR_ASSERT(cur_pb_type->num_modes == 0); /* primitive */
+    VTR_ASSERT(cur_pb_type->is_primitive()); /* primitive */
 
     AtomBlockId cur_pb_blk_id = atom_to_pb.pb_atom(cur_pb);
     if (cur_pb_blk_id && cur_pb_blk_id != blk_id) {
@@ -511,9 +511,7 @@ try_place_atom_block_rec(const t_pb_graph_node* pb_graph_node,
         return e_block_pack_status::BLK_FAILED_FEASIBLE;
     }
 
-    bool is_primitive = (pb_type->num_modes == 0);
-
-    if (is_primitive) {
+    if (pb_type->is_primitive()) {
         VTR_ASSERT(!atom_to_pb.pb_atom(pb)
                    && atom_to_pb.atom_pb(blk_id) == nullptr
                    && atom_cluster[blk_id] == LegalizationClusterId::INVALID());
@@ -576,7 +574,7 @@ static void reset_lookahead_pins_used(t_pb* cur_pb) {
         return; /* No pins used, no need to continue */
     }
 
-    if (pb_type->num_modes > 0 && cur_pb->name != nullptr) {
+    if (!pb_type->is_primitive() && cur_pb->name != nullptr) {
         for (int i = 0; i < cur_pb->pb_graph_node->num_input_pin_class; i++) {
             cur_pb->pb_stats->lookahead_input_pins_used[i].clear();
         }
@@ -821,7 +819,7 @@ static void try_update_lookahead_pins_used(t_pb* cur_pb,
                                            const AtomPBBimap& atom_to_pb) {
     // run recursively till a leaf (primitive) pb block is reached
     const t_pb_type* pb_type = cur_pb->pb_graph_node->pb_type;
-    if (pb_type->num_modes > 0 && cur_pb->name != nullptr) {
+    if (!pb_type->is_primitive() && cur_pb->name != nullptr) {
         if (cur_pb->child_pbs != nullptr) {
             for (int i = 0; i < pb_type->modes[cur_pb->mode].num_pb_type_children; i++) {
                 if (cur_pb->child_pbs[i] != nullptr) {
@@ -848,7 +846,7 @@ static void try_update_lookahead_pins_used(t_pb* cur_pb,
 static bool check_lookahead_pins_used(t_pb* cur_pb, t_ext_pin_util max_external_pin_util) {
     const t_pb_type* pb_type = cur_pb->pb_graph_node->pb_type;
 
-    if (pb_type->num_modes > 0 && cur_pb->name) {
+    if (!pb_type->is_primitive() && cur_pb->name) {
         for (int i = 0; i < cur_pb->pb_graph_node->num_input_pin_class; i++) {
             size_t class_size = cur_pb->pb_graph_node->input_pin_class_size[i];
 
@@ -1015,7 +1013,7 @@ static void revert_place_atom_block(const AtomBlockId blk_id,
 static void commit_lookahead_pins_used(t_pb* cur_pb) {
     const t_pb_type* pb_type = cur_pb->pb_graph_node->pb_type;
 
-    if (pb_type->num_modes > 0 && cur_pb->name) {
+    if (!pb_type->is_primitive() && cur_pb->name) {
         for (int i = 0; i < cur_pb->pb_graph_node->num_input_pin_class; i++) {
             VTR_ASSERT(cur_pb->pb_stats->lookahead_input_pins_used[i].size() <= (unsigned int)cur_pb->pb_graph_node->input_pin_class_size[i]);
             for (size_t j = 0; j < cur_pb->pb_stats->lookahead_input_pins_used[i].size(); j++) {
@@ -1076,7 +1074,7 @@ static bool cleanup_pb(t_pb* pb) {
                     t_pb_type* pb_type = pb_child->pb_graph_node->pb_type;
 
                     /* Primitive, check occupancy */
-                    if (pb_type->num_modes == 0) {
+                    if (pb_type->is_primitive()) {
                         if (pb_child->name != nullptr) {
                             can_free = false;
                         }

vpr/src/pack/cluster_util.cpp

@@ -215,7 +215,7 @@ size_t update_pb_type_count(const t_pb* pb, std::map<t_pb_type*, int>& pb_type_c
 
     pb_type_count[pb_type]++;
 
-    if (pb_type->num_modes > 0) {
+    if (!pb_type->is_primitive()) {
         for (int i = 0; i < mode->num_pb_type_children; i++) {
             for (int j = 0; j < mode->pb_type_children[i].num_pb; j++) {
                 if (pb->child_pbs[i] && pb->child_pbs[i][j].name) {
@@ -365,7 +365,7 @@ bool pb_used_for_blif_model(const t_pb* pb, const std::string& blif_model_name)
         }
     }
 
-    if (pb_type->num_modes > 0) {
+    if (!pb_type->is_primitive()) {
         for (int i = 0; i < mode->num_pb_type_children; i++) {
             for (int j = 0; j < mode->pb_type_children[i].num_pb; j++) {
                 if (pb->child_pbs[i] && pb->child_pbs[i][j].name) {