[PATCH] Clear DECL_GIMPLE_REG_P when making parameter copy addressable (PR tree-optimization/50735)

[Jakub Jelinek]

Hi!

gimplify_parameters uses create_tmp_reg, but sometimes it decides to make
it addressable (if the PARM_DECL is addressable).  If so, it must not be
DECL_GIMPLE_REG_P.

Alternatively we could call create_tmp_reg only if !TREE_ADDRESSABLE and
call create_tmp_var instead for TREE_ADDRESSABLE (+ set TREE_ADDRESSABLE).

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2011-10-16  Jakub Jelinek  <ja...@redhat.com>

        PR tree-optimization/50735
        * function.c (gimplify_parameters): When making local TREE_ADDRESSABLE,
        also clear DECL_GIMPLE_REG_P.

--- gcc/function.c.jj   2011-10-14 08:21:56.000000000 +0200
+++ gcc/function.c      2011-10-15 12:43:23.000000000 +0200
@@ -3624,7 +3624,10 @@ gimplify_parameters (void)
                     not the PARMs.  Keep the parms address taken
                     as we'll query that flag during gimplification.  */
                  if (TREE_ADDRESSABLE (parm))
-                   TREE_ADDRESSABLE (local) = 1;
+                   {
+                     TREE_ADDRESSABLE (local) = 1;
+                     DECL_GIMPLE_REG_P (local) = 0;
+                   }
                }
              else
                {

        Jakub