2011-10-30 Steven G. Kargl <kargl@gcc.gnu.org>

[pf3gnuchains/gcc-fork.git] / gcc / mode-switching.c

diff --git a/gcc/mode-switching.c b/gcc/mode-switching.c
index d4c7b24..7ea241c 100644 (file)
--- a/gcc/mode-switching.c
+++ b/gcc/mode-switching.c
@@ -499,6 +499,7 @@ optimize_mode_switching (void)
        {
          struct seginfo *ptr;
          int last_mode = no_mode;
+         bool any_set_required = false;
          HARD_REG_SET live_now;
 
          REG_SET_TO_HARD_REG_SET (live_now, df_get_live_in (bb));
@@ -527,6 +528,7 @@ optimize_mode_switching (void)
 
                  if (mode != no_mode && mode != last_mode)
                    {
+                     any_set_required = true;
                      last_mode = mode;
                      ptr = new_seginfo (mode, insn, bb->index, live_now);
                      add_seginfo (info + bb->index, ptr);
@@ -548,8 +550,10 @@ optimize_mode_switching (void)
            }
 
          info[bb->index].computing = last_mode;
-         /* Check for blocks without ANY mode requirements.  */
-         if (last_mode == no_mode)
+         /* Check for blocks without ANY mode requirements.
+            N.B. because of MODE_AFTER, last_mode might still be different
+            from no_mode.  */
+         if (!any_set_required)
            {
              ptr = new_seginfo (no_mode, BB_END (bb), bb->index, live_now);
              add_seginfo (info + bb->index, ptr);
@@ -772,6 +776,6 @@ struct rtl_opt_pass pass_mode_switching =
   0,                                    /* properties_destroyed */
   0,                                    /* todo_flags_start */
   TODO_df_finish | TODO_verify_rtl_sharing |
-  TODO_dump_func                        /* todo_flags_finish */
+  0                                     /* todo_flags_finish */
  }
 };