preliminary code for unaligned Load/Store lowering added

[r15438]

ir/lower/lower_hl.c

@@ -506,6 +506,20 @@ static void lower_bitfields_stores(ir_node *store) {
 	set_Store_ptr(store, ptr);
 }  /* lower_bitfields_stores */
 
+/**
+ * Lowers unaligned Loads.
+ */
+static void lower_unaligned_Load(ir_node *load) {
+	/* NYI */
+}
+
+/**
+ * Lowers unaligned Stores
+ */
+static void lower_unaligned_Store(ir_node *store) {
+	/* NYI */
+}
+
 /**
  * lowers IR-nodes, called from walker
  */
@@ -518,6 +532,14 @@ static void lower_irnode(ir_node *irn, void *env) {
 	case iro_SymConst:
 		lower_symconst(irn);
 		break;
+	case iro_Load:
+		if (env != NULL && get_Load_align(irn) == align_non_aligned)
+			lower_unaligned_Load(irn);
+		break;
+	case iro_Store:
+		if (env != NULL && get_Store_align(irn) == align_non_aligned)
+			lower_unaligned_Store(irn);
+		break;
 	default:
 		break;
 	}
@@ -563,7 +585,7 @@ void lower_highlevel(void) {
 		/* First step: lower bitfield access: must be run as long as Sels still exists. */
 		irg_walk_graph(irg, NULL, lower_bf_access, NULL);
 
-		/* Finally: lower SymConst-Size and Sel nodes. */
+		/* Finally: lower SymConst-Size and Sel nodes, unaligned Load/Stores. */
 		irg_walk_graph(irg, NULL, lower_irnode, NULL);
 
 		set_irg_phase_low(irg);