Improve iCE40 and common Loc code

Signed-off-by: Clifford Wolf <clifford@clifford.at>

common/nextpnr.h

@@ -27,6 +27,8 @@
 #include <unordered_set>
 #include <vector>
 
+#include <boost/functional/hash.hpp>
+
 #ifndef NEXTPNR_H
 #define NEXTPNR_H
 
@@ -161,10 +163,27 @@ struct GraphicElement
 struct Loc
 {
     int x = -1, y = -1, z = -1;
+
+    bool operator==(const Loc &other) const { return (x == other.x) && (y == other.y) && (z == other.z); }
+    bool operator!=(const Loc &other) const { return (x != other.x) || (y != other.y) || (z == other.z); }
 };
 
 NEXTPNR_NAMESPACE_END
 
+namespace std {
+template <> struct hash<NEXTPNR_NAMESPACE_PREFIX Loc>
+{
+    std::size_t operator()(const NEXTPNR_NAMESPACE_PREFIX Loc &obj) const noexcept
+    {
+        std::size_t seed = 0;
+        boost::hash_combine(seed, hash<int>()(obj.x));
+        boost::hash_combine(seed, hash<int>()(obj.y));
+        boost::hash_combine(seed, hash<int>()(obj.z));
+        return seed;
+    }
+};
+} // namespace std
+
 #include "archdefs.h"
 
 NEXTPNR_NAMESPACE_BEGIN

ice40/arch.cc

@@ -255,11 +255,40 @@ BelId Arch::getBelByName(IdString name) const
     return ret;
 }
 
+BelId Arch::getBelByLocation(int x, int y, int z) const
+{
+    if (bel_by_loc.empty()) {
+        for (int i = 0; i < chip_info->num_bels; i++)
+            bel_by_loc[getBelLocation(BelId{i})] = i;
+    }
+
+    auto it = bel_by_loc.find(Loc{x, y, z});
+    if (it != bel_by_loc.end())
+        return BelId{it->second};
+    return BelId();
+}
+
+BelRange Arch::getBelsByTile(int x, int y) const
+{
+    // In iCE40 chipdb bels at the same tile are consecutive and dense z ordinates are used
+    BelRange br;
+    br.b.cursor = Arch::getBelByLocation(x, y, 0);
+    br.e.cursor = br.b.cursor;
+
+    if (br.e.cursor != -1) {
+        while (br.e.cursor < chip_info->num_bels &&
+               chip_info->bel_data[br.e.cursor].x == x &&
+               chip_info->bel_data[br.e.cursor].y == y)
+            br.e.cursor++;
+    }
+
+    return br;
+}
+
 BelRange Arch::getBelsAtSameTile(BelId bel) const
 {
     BelRange br;
     NPNR_ASSERT(bel != BelId());
-    // This requires Bels at the same tile are consecutive
     int x = chip_info->bel_data[bel.index].x;
     int y = chip_info->bel_data[bel.index].y;
     int start = bel.index, end = bel.index;

ice40/arch.h

@@ -350,6 +350,7 @@ struct Arch : BaseCtx
     mutable std::unordered_map<IdString, int> bel_by_name;
     mutable std::unordered_map<IdString, int> wire_by_name;
     mutable std::unordered_map<IdString, int> pip_by_name;
+    mutable std::unordered_map<Loc, int> bel_by_loc;
 
     std::vector<IdString> bel_to_cell;
     std::vector<IdString> wire_to_net;
@@ -449,18 +450,8 @@ struct Arch : BaseCtx
         return loc;
     }
 
-    BelId getBelByLocation(int x, int y, int z) const
+    BelId getBelByLocation(int x, int y, int z) const;
-    {
+    BelRange getBelsByTile(int x, int y) const;
-        // FIXME
-        return BelId();
-    }
-
-    BelRange getBelsByTile(int x, int y) const
-    {
-        BelRange range;
-        // FIXME
-        return range;
-    }
 
     bool getBelGlobalBuf(BelId bel) const
     {

ice40/archdefs.h

@@ -21,8 +21,6 @@
 #error Include "archdefs.h" via "nextpnr.h" only.
 #endif
 
-#include <boost/functional/hash.hpp>
-
 NEXTPNR_NAMESPACE_BEGIN
 
 typedef int delay_t;