Merge pull request #2664 from joshuahannan/develop

added while loop description

docs/assembly.rst

@@ -570,6 +570,20 @@ The following example computes the sum of an area in memory.
         }
     }
 
+For loops can also be written so that they behave like while loops:
+Simply leave the initialization and post-iteration parts empty.
+
+.. code::
+
+    {
+        let x := 0
+        let i := 0
+        for { } lt(i, 0x100) { } {     // while(i < 0x100)
+            x := add(x, mload(i))
+            i := add(i, 0x20)
+        }
+    } 
+
 Functions
 ---------