1 files changed, 39 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/opt/cse2.C b/gcc/testsuite/g++.dg/opt/cse2.C
new file mode 100644
index 000000000..325169dff
--- /dev/null
+++ b/gcc/testsuite/g++.dg/opt/cse2.C
@@ -0,0 +1,39 @@
+// This testcase caused ICE on IA-32 in simplify_unary_operation
+// CSE did not assume SUBREGs changing mode from integral to floating.
+// { dg-do run { target i?86-*-* sparc*-*-* x86_64-*-* } }
+// { dg-options "-O2" }
+
+struct A
+{
+  union
+    {
+      float f;
+      unsigned int w;
+    } a;
+
+  static inline const A foo (void)
+    {
+      return A ((unsigned int) (__extension__ ((union { unsigned l; float d; })
+					       { l: 0x3f800000 }).d));
+    }
+  inline A (float f) { a.f = f; }
+  A ();
+  inline A (unsigned int w) { a.w = w; }
+};
+
+A::A()
+{
+  *this = foo ();
+}
+
+A a;
+
+extern "C" void abort (void);
+extern "C" void exit (int);
+
+int main ()
+{
+  if (a.a.w != 1)
+    abort ();
+  exit (0);
+}