diff options
Diffstat (limited to 'gcc/function.c')
| -rw-r--r-- | gcc/function.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/gcc/function.c b/gcc/function.c index c4c9930..c612959 100644 --- a/gcc/function.c +++ b/gcc/function.c @@ -2237,6 +2237,11 @@ use_register_for_decl (const_tree decl) if (optimize) return true; + /* Thunks force a tail call even at -O0 so we need to avoid creating a + dangling reference in case the parameter is passed by reference. */ + if (TREE_CODE (decl) == PARM_DECL && cfun->tail_call_marked) + return true; + if (!DECL_REGISTER (decl)) return false; @@ -3328,9 +3333,8 @@ assign_parm_setup_reg (struct assign_parm_data_all *all, tree parm, of the parameter instead. */ if (data->arg.pass_by_reference && TYPE_MODE (TREE_TYPE (parm)) != BLKmode) { - /* Use a stack slot for debugging purposes, except if a tail call is - involved because this would create a dangling reference. */ - if (use_register_for_decl (parm) || cfun->tail_call_marked) + /* Use a stack slot for debugging purposes if possible. */ + if (use_register_for_decl (parm)) { parmreg = gen_reg_rtx (TYPE_MODE (TREE_TYPE (parm))); mark_user_reg (parmreg); |