Revert * trans-mem.c (requires_barrier): Do not instrument thread local

	variables and emit save/restore for them.

From-SVN: r183538

gcc/ChangeLog

+2012-01-26  Richard Henderson  <rth@redhat.com>
+
+	Revert 2012-01-24 change:
+	* trans-mem.c (requires_barrier): Do not instrument thread local
+	variables and emit save/restore for them.
+
 2012-01-25  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/51986

gcc/testsuite/gcc.dg/tm/threadlocal-1.c

-/* { dg-do compile } */
-/* { dg-options "-fgnu-tm -O -fdump-tree-tmedge" } */
-__thread int notshared = 0;
-int shared = 0;
-
-int main()
-{
-  __transaction_atomic
-    {
-      notshared++;
-      shared++;
-    }
-  return notshared + shared;
-}
-/* { dg-final { scan-tree-dump-times "tm_save.\[0-9_\]+ = notshared" 1 "tmedge" } } */
-/* { dg-final { scan-tree-dump-times "notshared = tm_save" 1 "tmedge" } } */
-/* { dg-final { cleanup-tree-dump "tmedge" } } */

gcc/trans-mem.c

 /* Passes for transactional memory support.
-   Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+   Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
 
    This file is part of GCC.
 
@@ -1488,18 +1488,7 @@ requires_barrier (basic_block entry_block, tree x, gimple stmt)
 	}
 
       if (is_global_var (x))
-	{
-	  if (DECL_THREAD_LOCAL_P (x))
-	    goto thread_local;
-	  if (DECL_HAS_VALUE_EXPR_P (x))
-	    {
-	      tree value = get_base_address (DECL_VALUE_EXPR (x));
-
-	      if (value && DECL_P (value) && DECL_THREAD_LOCAL_P (value))
-		goto thread_local;
-	    }
-	  return !TREE_READONLY (x);
-	}
+	return !TREE_READONLY (x);
       if (/* FIXME: This condition should actually go below in the
 	     tm_log_add() call, however is_call_clobbered() depends on
 	     aliasing info which is not available during
@@ -1509,14 +1498,17 @@ requires_barrier (basic_block entry_block, tree x, gimple stmt)
 	     lower_sequence_tm altogether.  */
 	  needs_to_live_in_memory (x))
 	return true;
-    thread_local:
-      /* For local memory that doesn't escape (aka thread private memory), 
-	 we can either save the value at the beginning of the transaction and
-	 restore on restart, or call a tm function to dynamically save and
-	 restore on restart (ITM_L*). */
-      if (stmt)
-	tm_log_add (entry_block, orig, stmt);
-      return false;
+      else
+	{
+	  /* For local memory that doesn't escape (aka thread private
+	     memory), we can either save the value at the beginning of
+	     the transaction and restore on restart, or call a tm
+	     function to dynamically save and restore on restart
+	     (ITM_L*).  */
+	  if (stmt)
+	    tm_log_add (entry_block, orig, stmt);
+	  return false;
+	}
 
     default:
       return false;