One less sign extension in an obscure case.

[r23608]

diff --git a/ir/be/ia32/ia32_transform.c b/ir/be/ia32/ia32_transform.c
index a029157..7326b16 100644 (file)
--- a/ir/be/ia32/ia32_transform.c
+++ b/ir/be/ia32/ia32_transform.c
@@ -3132,8 +3132,10 @@ static ir_node *gen_x87_gp_to_fp(ir_node *node, ir_mode *src_mode)
 
        /* first convert to 32 bit signed if necessary */
        if (get_mode_size_bits(src_mode) < 32) {
-               new_op = create_Conv_I2I(dbgi, block, noreg, noreg, nomem, new_op, src_mode);
-               SET_IA32_ORIG_NODE(new_op, node);
+               if (!upper_bits_clean(new_op, src_mode)) {
+                       new_op = create_Conv_I2I(dbgi, block, noreg, noreg, nomem, new_op, src_mode);
+                       SET_IA32_ORIG_NODE(new_op, node);
+               }
                mode = mode_Is;
        }