From: Richard Guenther <rguenther@suse.de>
Date: Thu, 2 Jul 2009 12:15:27 +0000 (+0000)
Subject: re PR tree-optimization/40585 (tracer duplicates blocks w/o adjusting EH tree)
X-Git-Tag: releases/gcc-4.3.4~95
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5c7ef9acfc348a1a355d8f735fb07496128cbb66;p=thirdparty%2Fgcc.git

re PR tree-optimization/40585 (tracer duplicates blocks w/o adjusting EH tree)

2009-07-02  Richard Guenther  <rguenther@suse.de>

        PR middle-end/40585
	* tree-cfg.c (tree_can_duplicate_bb_p): Disallow duplicating
	basic blocks with RESX_EXPR.

From-SVN: r149172
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 065439d9c35a..6a11ef4ecc17 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2009-07-02  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/40585
+	* tree-cfg.c (gimple_can_duplicate_bb_p): Disallow duplicating
+	basic blocks with GIMPLE_RESX.
+
 2009-07-01  Ben Elliston  <bje@au.ibm.com>
 
 	Backport from mainline:
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c
index 2924b777bccf..25a6216ba86f 100644
--- a/gcc/tree-cfg.c
+++ b/gcc/tree-cfg.c
@@ -5048,8 +5048,12 @@ tree_move_block_after (basic_block bb, basic_block after)
 /* Return true if basic_block can be duplicated.  */
 
 static bool
-tree_can_duplicate_bb_p (const_basic_block bb ATTRIBUTE_UNUSED)
+tree_can_duplicate_bb_p (const_basic_block bb)
 {
+  tree_stmt_iterator tsi = tsi_last (bb_stmt_list (bb));
+  /* We cannot duplicate RESX_EXPRs due to expander limitations.  */
+  if (!tsi_end_p (tsi) && TREE_CODE (tsi_stmt (tsi)) == RESX_EXPR)
+    return false;
   return true;
 }