1 files changed, 34 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/opt/reg-stack2.C b/gcc/testsuite/g++.dg/opt/reg-stack2.C
new file mode 100644
index 00000000000..08cd590b471
--- /dev/null
+++ b/gcc/testsuite/g++.dg/opt/reg-stack2.C
@@ -0,0 +1,34 @@
+// PR target/9786
+// Origin: <nick@ilm.com>
+
+// This used to fail on x86 because the reg-stack pass deleted
+// an insn that could seemingly trap (but actually doesn't)
+// without updating the CFG.
+
+// { dg-do compile }
+// { dg-options "-O2 -fnon-call-exceptions" }
+
+struct D1 {
+    float l;
+    D1 GS() const {D1 d;float f=.299*l;d.l=f;return d;}
+    static D1 G() {return D1();}
+};
+
+struct D2 {
+    D1 g;
+    D2(const D1& gi) : g(gi) {}
+    D2 GS() const {return D2(g.GS());}
+};
+
+class A {
+  public:
+    virtual ~A() {}
+};
+
+class B : public A {
+  public:
+    B(const D2& mi);
+    D2 fm;
+};
+
+B::B(const D2 &mi) : fm(mi.GS()) {}