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@@ Line 402: / Line 402: @@
        core.stdc.string, std.typetuple;
-template Range(int stop) {
+template Range(int stop) { // for manual loop unroll
     static if (stop <= 0)
         alias TypeTuple!() Range;
@@ Line 409: / Line 409: @@
 }
-__gshared enum int[2][4] dir = [[0, -1], [-1, 0], [0, 1], [1, 0]];
+enum int[2][4] dir = [[0, -1], [-1, 0], [0, 1], [1, 0]];
-__gshared ubyte* grid;
+__gshared ubyte[] grid;
 __gshared int w, h, len;
 __gshared ulong cnt;
@@ Line 447: / Line 447: @@
     len = (h + 1) * (w + 1);
+    {
-    grid = cast(ubyte*)alloca(len);
-    if (grid == null)
+        // grid = new ubyte[len]; // slower
-        exit(1);
+        ubyte* ptr = cast(ubyte*)alloca(len);
-    memset(grid, 0, len);
+        if (ptr == null)
+            exit(1);
+        grid = ptr[0 .. len];
+    }
+    grid[] = 0;
     len--;
+    //next = [-1, -w - 1, 1, w + 1]; // slow
     next[0] = -1;
     next[1] = -w - 1;