function.c (assign_parms): Save and restore setting of TREE_USED (parm).

[gcc.git] / gcc / function.c

diff --git a/gcc/function.c b/gcc/function.c
index 8a67457495b80175f147ffb6c490c58d640bb57e..1cb8c44bbcd3829d2c47d8cf45eeb56e5268edd7 100644 (file)
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -4378,6 +4378,7 @@ assign_parms (fndecl, second_time)
          if (nominal_mode != passed_mode
              || promoted_nominal_mode != promoted_mode)
            {
+             int save_tree_used;
              /* ENTRY_PARM has been converted to PROMOTED_MODE, its
                 mode, by the caller.  We now have to convert it to 
                 NOMINAL_MODE, if different.  However, PARMREG may be in
@@ -4404,8 +4405,11 @@ assign_parms (fndecl, second_time)
              push_to_sequence (conversion_insns);
              tempreg = convert_to_mode (nominal_mode, tempreg, unsignedp);
 
+             /* TREE_USED gets set erroneously during expand_assignment.  */
+             save_tree_used = TREE_USED (parm);
              expand_assignment (parm,
                                 make_tree (nominal_type, tempreg), 0, 0);
+             TREE_USED (parm) = save_tree_used;
              conversion_insns = get_insns ();
              did_conversion = 1;
              end_sequence ();