tree-nrv.c (tree_nrv): Fix to check assignments to the RESULT_DECL rather than just RETURN_EXPRs.

        * tree-nrv.c (tree_nrv): Fix to check assignments to the
        RESULT_DECL rather than just RETURN_EXPRs.
        (finalize_nrv_r): Adjust.

From-SVN: r101296

1 files changed, 25 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/nrv2.c b/gcc/testsuite/gcc.dg/nrv2.c
new file mode 100644
index 0000000..e4d1f9a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/nrv2.c
@@ -0,0 +1,25 @@
+/* Test that the tree_nrv pass works by making sure that we don't generate
+   a memcpy.  Throw in a bit of control flow to make its job a bit harder.  */
+
+/* { dg-options "-O" } */
+
+struct A { int i[100]; };
+
+int b;
+
+struct A f ()
+{
+  struct A a;
+  if (b)
+    {
+      a.i[0] = 42;
+      return a;
+    }
+  else
+    {
+      a.i[42] = 1;
+      return a;
+    }
+}
+
+/* { dg-final { scan-assembler-not "memcpy" } } */