Backport upstream 4.6 patches to fix 2 gcc bugs.

Fix a bad interaction of inliner x return slot optimization x
named value optimization

Replace tst instruction with lsls for a single bit test

Change-Id: I30c212d9e99c79eae182da66b97d9d9f4d738faf

2 files changed, 39 insertions, 0 deletions

diff --git a/gcc-4.4.3/gcc/testsuite/g++.dg/torture/pr45709-2.C b/gcc-4.4.3/gcc/testsuite/g++.dg/torture/pr45709-2.C
new file mode 100644
index 000000000..1f6a2344f
--- /dev/null
+++ b/gcc-4.4.3/gcc/testsuite/g++.dg/torture/pr45709-2.C
@@ -0,0 +1,20 @@
+// { dg-do compile }
+
+struct Region {
+    int storage[4];
+    int count;
+};
+static inline Region subtract(int lhs)
+{
+  Region reg;
+  int* storage = reg.storage;
+  int* storage2 = reg.storage;
+  if (lhs > 0)
+    storage++, storage2--;
+  reg.count = storage - reg.storage + storage2 - reg.storage;
+  return reg;
+}
+void bar(int a)
+{
+  const Region copyBack(subtract(a));
+}
diff --git a/gcc-4.4.3/gcc/testsuite/g++.dg/torture/pr45709.C b/gcc-4.4.3/gcc/testsuite/g++.dg/torture/pr45709.C
new file mode 100644
index 000000000..1584ec76a
--- /dev/null
+++ b/gcc-4.4.3/gcc/testsuite/g++.dg/torture/pr45709.C
@@ -0,0 +1,19 @@
+// { dg-do compile }
+
+struct Region {
+    int storage[4];
+    int count;
+};
+static inline Region subtract(int lhs)
+{
+  Region reg;
+  int* storage = reg.storage;
+  if (lhs > 0)
+    storage++;
+  reg.count = storage - reg.storage;
+  return reg;
+}
+void bar(int a)
+{
+  const Region copyBack(subtract(a));
+}