Removed unused datastructure in auto-router.

May (or may not) have some effect on #5424.

Fixes https://gitlab.com/kicad/code/kicad/issues/5424

pcbnew/autorouter/ar_matrix.cpp

@@ -39,8 +39,6 @@ AR_MATRIX::AR_MATRIX()
     m_BoardSide[1]       = nullptr;
     m_DistSide[0]        = nullptr;
     m_DistSide[1]        = nullptr;
-    m_DirSide[0]         = nullptr;
-    m_DirSide[1]         = nullptr;
     m_opWriteCell        = nullptr;
     m_Nrows              = 0;
     m_Ncols              = 0;
@@ -103,7 +101,6 @@ int AR_MATRIX::InitRoutingMatrix()
     {
         m_BoardSide[side] = nullptr;
         m_DistSide[side] = nullptr;
-        m_DirSide[side] = nullptr;
 
         // allocate matrix & initialize everything to empty
         m_BoardSide[side] = (MATRIX_CELL*) operator new( ii * sizeof( MATRIX_CELL ) );
@@ -119,13 +116,6 @@ int AR_MATRIX::InitRoutingMatrix()
         if( m_DistSide[side] == nullptr )
             return -1;
 
-        // allocate Dir (chars)
-        m_DirSide[side] = (char*) operator new( ii );
-        memset( m_DirSide[side], 0, ii );
-
-        if( m_DirSide[side] == nullptr )
-            return -1;
-
         side = AR_SIDE_TOP;
     }
 
@@ -142,13 +132,6 @@ void AR_MATRIX::UnInitRoutingMatrix()
 
     for( ii = 0; ii < AR_MAX_ROUTING_LAYERS_COUNT; ii++ )
     {
-        // de-allocate Dir matrix
-        if( m_DirSide[ii] )
-        {
-            delete m_DirSide[ii];
-            m_DirSide[ii] = nullptr;
-        }
-
         // de-allocate Distances matrix
         if( m_DistSide[ii] )
         {

pcbnew/autorouter/ar_matrix.h

@@ -51,13 +51,10 @@ class AR_MATRIX
 public:
     typedef unsigned char MATRIX_CELL;
     typedef int           DIST_CELL;
-    typedef char          DIR_CELL;
 
     MATRIX_CELL* m_BoardSide[AR_MAX_ROUTING_LAYERS_COUNT]; // the image map of 2 board sides
     DIST_CELL*   m_DistSide[AR_MAX_ROUTING_LAYERS_COUNT];  // the image map of 2 board sides:
                                                            // distance to cells
-    DIR_CELL* m_DirSide[AR_MAX_ROUTING_LAYERS_COUNT];      // the image map of 2 board sides:
-                                                           // pointers back to source
     int      m_RoutingLayersCount; // Number of layers for autorouting (0 or 1)
     int      m_GridRouting;        // Size of grid for autoplace/autoroute
     EDA_RECT m_BrdBox;             // Actual board bounding box