minor wasm optimizations

scripts/wasm-life-2/game.wat

@@ -61,62 +61,39 @@
 
   (func $getBoardPtr (result i32)
     global.get $currentBuffer
-    i32.eqz
+    global.get $boardBufferLength
-    if (result i32)
+    i32.mul
-      global.get $buffer0ptr
-    else
-      global.get $buffer1ptr
-    end
   )
 
   (func $swapBoards
     global.get $currentBuffer
     i32.eqz
-    if (result i32)
-      i32.const 1
-    else
-      i32.const 0
-    end
     global.set $currentBuffer
   )
 
-  (func $positionInRange (param $position i32) (param $min i32) (param $max i32) (result i32)
+  (func $positionOutOfRange (param $position i32) (param $max i32) (result i32)
     local.get $position
-    local.get $min
-    i32.lt_s
-
-    if
     i32.const 0
-      return
+    i32.lt_s
-    end
 
     local.get $position
     local.get $max
     i32.ge_s
 
-    if
+    i32.or
-      i32.const 0
-      return
-    end
-
-    i32.const 1
-    return
   )
 
   (func $getIndexForPosition (param $row i32) (param $column i32) (result i32)
+    (local $result i32)
     local.get $row
-    i32.const 0
     global.get $boardHeight
-    call $positionInRange
+    call $positionOutOfRange
 
     local.get $column
-    i32.const 0
     global.get $boardWidth
-    call $positionInRange
+    call $positionOutOfRange
 
     i32.and
-    i32.eqz
-
     if
       i32.const -1
       return