From: Richard Guenther <rguenther@suse.de>
Date: Tue, 17 Feb 2009 16:01:53 +0000 (+0000)
Subject: re PR tree-optimization/39202 (internal compiler error: in collapse_rest_of_var,... 
X-Git-Tag: releases/gcc-4.4.0~524
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=6b24ee26e51ea066a5324578c95a0256dbd7a5c6;p=thirdparty%2Fgcc.git

re PR tree-optimization/39202 (internal compiler error: in collapse_rest_of_var, at tree-ssa-structalias.c:3296)

2009-02-17  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/39202
	* tree-ssa-structalias.c (do_structure_copy): Before collapsing
	a var make sure to follow existing collapses.

	* gcc.c-torture/compile/pr39202.c: New testcase.

From-SVN: r144235
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d4be34763d08..6947e99f36f9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2009-02-17  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/39202
+	* tree-ssa-structalias.c (do_structure_copy): Before collapsing
+	a var make sure to follow existing collapses.
+
 2009-02-17  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/39214
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index bf7b705f6cd4..5b620d4eeacf 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2009-02-17  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/39202
+	* gcc.c-torture/compile/pr39202.c: New testcase.
+
 2009-02-17  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/39204
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr39202.c b/gcc/testsuite/gcc.c-torture/compile/pr39202.c
new file mode 100644
index 000000000000..f79b83194a96
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr39202.c
@@ -0,0 +1,33 @@
+typedef struct
+{
+  union
+    {
+      int * aaa;
+    } u;
+} t_a;
+
+typedef struct
+{
+  unsigned bbb : 1;
+} t_b;
+
+typedef struct
+{
+  int ccc;
+  t_a ddd;
+  t_b eee;
+  int fff;
+} t_c;
+
+typedef struct t_d
+{
+  t_c f1;
+  t_c f2;
+} t_d;
+
+void foo (void)
+{
+  t_d ggg;
+  ggg.f1 = ggg.f2;
+}
+
diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c
index f9962b33a98d..8f8879694275 100644
--- a/gcc/tree-ssa-structalias.c
+++ b/gcc/tree-ssa-structalias.c
@@ -3405,8 +3405,8 @@ do_structure_copy (tree lhsop, tree rhsop)
 	{
 	  if (!do_simple_structure_copy (lhs, rhs, MIN (lhssize, rhssize)))
 	    {
-	      lhs.var = collapse_rest_of_var (lhs.var);
-	      rhs.var = collapse_rest_of_var (rhs.var);
+	      lhs.var = collapse_rest_of_var (get_varinfo_fc (lhs.var)->id);
+	      rhs.var = collapse_rest_of_var (get_varinfo_fc (rhs.var)->id);
 	      lhs.offset = 0;
 	      rhs.offset = 0;
 	      lhs.type = SCALAR;