Add an asssert and testcase for PR 68064

2015-12-11  Martin Jambor  <mjambor@suse.cz>

	PR ipa/68064
	* ipa-prop.c (ipa_compute_jump_functions_for_edge): Add checking
	assert that align is nonzero.

testsuite/
	* g++.dg/torture/pr68064.C: New test.

From-SVN: r231559

gcc/ChangeLog

+2015-12-11  Martin Jambor  <mjambor@suse.cz>
+
+	PR ipa/68064
+	* ipa-prop.c (ipa_compute_jump_functions_for_edge): Add checking
+	assert that align is nonzero.
+
 2015-12-11  Dominik Vogt  <vogt@linux.vnet.ibm.com>
 
 	* config/s390/s390.c (s390_expand_setmem): Use new expanders.

gcc/ipa-prop.c

@@ -1646,6 +1646,7 @@ ipa_compute_jump_functions_for_edge (struct ipa_func_body_info *fbi,
 	      && align % BITS_PER_UNIT == 0
 	      && hwi_bitpos % BITS_PER_UNIT == 0)
 	    {
+	      gcc_checking_assert (align != 0);
 	      jfunc->alignment.known = true;
 	      jfunc->alignment.align = align / BITS_PER_UNIT;
 	      jfunc->alignment.misalign = hwi_bitpos / BITS_PER_UNIT;

gcc/testsuite/ChangeLog

+2015-12-11  Martin Jambor  <mjambor@suse.cz>
+
+	PR ipa/68064
+	* g++.dg/torture/pr68064.C: New test.
+
 2015-12-11  Dominik Vogt  <vogt@linux.vnet.ibm.com>
 
 	* gcc.target/s390/md/setmem_long-1.c: New test.

gcc/testsuite/g++.dg/torture/pr68064.C

+// { dg-do compile }
+
+template <class Config> class A {
+public:
+  class B;
+  typedef typename Config::template D<A>::type TypeHandle;
+  static A *Tagged() { return B::New(B::kTagged); }
+  static TypeHandle Union(TypeHandle);
+  static TypeHandle Representation(TypeHandle, typename Config::Region *);
+  bool Is();
+};
+
+template <class Config> class A<Config>::B {
+  friend A;
+  enum { kTaggedPointer = 1 << 31, kTagged = kTaggedPointer };
+  static A *New(int p1) { return Config::from_bitset(p1); }
+};
+
+struct C {
+  typedef int Region;
+  template <class> struct D { typedef A<C> *type; };
+  static A<C> *from_bitset(unsigned);
+};
+A<C> *C::from_bitset(unsigned p1) { return reinterpret_cast<A<C> *>(p1); }
+
+namespace {
+int *a;
+void fn1(A<C> *p1) { A<C>::Union(A<C>::Representation(p1, a)); }
+}
+
+void fn2() {
+  A<C> b;
+  A<C> *c = b.Is() ? 0 : A<C>::Tagged();
+  fn1(c);
+}