Merge changes I65f8bbbc,Iaa65e2d1,Ifa0139c9,Ic39d2a2b,I78cf0a23

* changes:
  backport fix for PR65735
  backport patch to fix PR65177
  backport patch to fix PR65048
  backport patch for PR 64878: do not jump thread across more than one back-edge
  port revision 219584 from linaro/gcc-4_9-branch

1 files changed, 50 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-9.c b/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-9.c
new file mode 100644
index 000000000..6be42038b
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-9.c
@@ -0,0 +1,50 @@
+/* PR 65048 */
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+int a, b, c, d;
+void fn (void);
+
+int
+foo (x)
+{
+  switch (x)
+    {
+    case 'A':
+      return 'T';
+    case 'U':
+      return 'A';
+    }
+}
+
+void
+bar (int x, int y)
+{
+  switch (c)
+    {
+    case 'U':
+      switch (x)
+	{
+	default:
+	  fn ();
+	case 'G':
+	  switch (y)
+	    {
+	    case 'A':
+	      d = 7;
+	    }
+	}
+    }
+}
+
+void
+baz (void)
+{
+  while (1)
+    {
+      a = foo ();
+      b = foo ();
+      bar (a, b);
+    }
+}
+