removed vec_step() as this could lead to errors on older SDKs

diakgcn120223.cl

@@ -1,4 +1,4 @@
-// DiaKGCN 23-02-2012 - OpenCL kernel by Diapolo
+// DiaKGCN 24-02-2012 - OpenCL kernel by Diapolo
 //
 // Parts and / or ideas for this kernel are based upon the public-domain poclbm project, the phatk kernel by Phateus and the DiabloMiner kernel by DiabloD3.
 // The kernel was rewritten by me (Diapolo) and is still public-domain!
@@ -53,8 +53,12 @@ __kernel
 	u V[8];
 	u W[16];
 
-#if defined(VECTORS2) || defined(VECTORS4) || defined(VECTORS8)
-	const u nonce = (uint)(get_local_id(0)) * (uint)(vec_step(u)) + (uint)(get_group_id(0)) * (uint)(WORKVEC) + base;
+#ifdef VECTORS8
+	const u nonce = (uint)(get_local_id(0)) * 8U + (uint)(get_group_id(0)) * (uint)(WORKVEC) + base;
+#elif defined VECTORS4
+	const u nonce = (uint)(get_local_id(0)) * 4U + (uint)(get_group_id(0)) * (uint)(WORKVEC) + base;
+#elif defined VECTORS2
+	const u nonce = (uint)(get_local_id(0)) * 2U + (uint)(get_group_id(0)) * (uint)(WORKVEC) + base;
 #else
 	const u nonce = (uint)(get_local_id(0)) + (uint)(get_group_id(0)) * (uint)(WORKSIZE) + base;
 #endif