+ * trans-mem.c (requires_barrier): Do not instrument thread local + variables and emit save/restore for them.

+       * trans-mem.c (requires_barrier): Do not instrument thread local
+       variables and emit save/restore for them.


Co-Authored-By: Patrick Marlier <patrick.marlier@gmail.com>

From-SVN: r183476

1 files changed, 21 insertions, 13 deletions

diff --git a/gcc/trans-mem.c b/gcc/trans-mem.c
index de7a913..06b1d81 100644
--- a/gcc/trans-mem.c
+++ b/gcc/trans-mem.c
@@ -1,5 +1,5 @@
 /* Passes for transactional memory support.
-   Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+   Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
 
    This file is part of GCC.
 
@@ -1488,7 +1488,18 @@ requires_barrier (basic_block entry_block, tree x, gimple stmt)
 	}
 
       if (is_global_var (x))
-	return !TREE_READONLY (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);
+	}
       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
@@ -1498,17 +1509,14 @@ requires_barrier (basic_block entry_block, tree x, gimple stmt)
 	     lower_sequence_tm altogether.  */
 	  needs_to_live_in_memory (x))
 	return true;
-      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;
-	}
+    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;
 
     default:
       return false;