don't extend load_mode when folding reloads

[r21683]

diff --git a/ir/be/ia32/bearch_ia32.c b/ir/be/ia32/bearch_ia32.c
index 5923ae9..c071f54 100644 (file)
--- a/ir/be/ia32/bearch_ia32.c
+++ b/ir/be/ia32/bearch_ia32.c
@@ -839,6 +839,9 @@ static int ia32_possible_memory_operand(const ir_node *irn, unsigned int i) {
 static void ia32_perform_memory_operand(ir_node *irn, ir_node *spill,
                                         unsigned int i)
 {
+       ir_mode *load_mode;
+       ir_mode *dest_op_mode;
+
        ia32_code_gen_t *cg = ia32_current_cg;
 
        assert(ia32_possible_memory_operand(irn, i) && "Cannot perform memory operand change");
@@ -848,7 +851,12 @@ static void ia32_perform_memory_operand(ir_node *irn, ir_node *spill,
        }
 
        set_ia32_op_type(irn, ia32_AddrModeS);
-       set_ia32_ls_mode(irn, get_irn_mode(get_irn_n(irn, i)));
+
+       load_mode    = get_irn_mode(get_irn_n(irn, i));
+       dest_op_mode = get_ia32_ls_mode(irn);
+       if (get_mode_size_bits(load_mode) <= get_mode_size_bits(dest_op_mode)) {
+               set_ia32_ls_mode(irn, load_mode);
+       }
        set_ia32_use_frame(irn);
        set_ia32_need_stackent(irn);