Ignore debug insns in memcmp optimization

[Bernd Schmidt <bschmidt at redhat dot com>]

This fixes a few PRs from the last few days. Fully tested on 
x86_64-linux. Ok?


Bernd

	PR debug/71432
	PR ada/71413
	* tree-ssa-strlen.c (handle_builtin_memcmp): Ignore debug insns.

	PR debug/71432
	PR ada/71413
	* g++.dg/debug/pr71432.C: New test.

Index: gcc/testsuite/g++.dg/debug/pr71432.C
===================================================================
--- gcc/testsuite/g++.dg/debug/pr71432.C	(revision 0)
+++ gcc/testsuite/g++.dg/debug/pr71432.C	(working copy)
@@ -0,0 +1,140 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcompare-debug" } */
+
+namespace std
+{
+  typedef long unsigned int size_t;
+  inline namespace __cxx11
+  {
+  } }
+
+extern "C++"
+{
+  namespace std
+  {
+    template < typename _Tp > struct __is_char
+    {
+    };
+    template <> struct __is_char <char >
+    {
+      enum
+	{ __value = 1 };
+    };
+  } namespace __gnu_cxx
+  {
+    template < bool, typename > struct __enable_if
+    {
+    };
+    template < typename _Tp > struct __enable_if <true, _Tp >
+    {
+      typedef _Tp __type;
+    };
+  }
+}
+
+namespace __gnu_cxx
+{
+  template < typename _Tp > class new_allocator
+  {
+  };
+}
+
+namespace std
+{
+  template < typename _Tp > using __allocator_base =
+    __gnu_cxx::new_allocator < _Tp >;
+template < typename _Tp > class allocator:public __allocator_base < _Tp >
+  {
+  };
+  template < typename _Alloc > struct allocator_traits
+  {
+  };
+  template < typename _Tp > struct allocator_traits <allocator < _Tp >>
+  {
+    using size_type = std::size_t;
+    template < typename _Up > using rebind_alloc = allocator < _Up >;
+  };
+}
+
+namespace __gnu_cxx
+{
+  template < typename _Alloc > struct __alloc_traits:std::allocator_traits <_Alloc >
+  {
+    typedef std::allocator_traits < _Alloc > _Base_type;
+     template < typename _Tp > struct rebind
+    {
+      typedef typename _Base_type::template rebind_alloc < _Tp > other;
+     };
+   };
+}
+
+namespace std
+{
+  template < class _CharT > struct char_traits;
+  namespace __cxx11
+  {
+    template < typename _CharT, typename _Traits =
+      char_traits < _CharT >, typename _Alloc =
+      allocator < _CharT > >class basic_string;
+    typedef basic_string < char >string;
+  }
+}
+
+namespace std
+{
+  template <> struct char_traits <char >
+  {
+    typedef char char_type;
+     static int compare (const char_type * __s1, const char_type * __s2,
+			  size_t __n)
+    {
+      return __builtin_memcmp (__s1, __s2, __n);
+    }
+  };
+
+  namespace __cxx11
+  {
+    template < typename _CharT, typename _Traits, typename _Alloc >
+    class basic_string
+    {
+      typedef typename __gnu_cxx::__alloc_traits <_Alloc >::template rebind < _CharT >::other _Char_alloc_type;
+      typedef __gnu_cxx::__alloc_traits < _Char_alloc_type > _Alloc_traits;
+      typedef typename _Alloc_traits::size_type size_type;
+
+    public:
+      size_type size ()const noexcept
+      {
+      }
+      const _CharT *data () const noexcept
+      {
+      }
+    };
+  }
+
+  template < typename _CharT > inline typename __gnu_cxx::__enable_if <
+    __is_char < _CharT >::__value,
+    bool >::__type operator== (const basic_string < _CharT > &__lhs,
+			       const basic_string < _CharT > &__rhs) noexcept
+  {
+    return !std::char_traits < _CharT >::compare (__lhs.data (),
+						   __rhs.data (),
+						   __lhs.size ());
+  }
+};
+
+class CLIParameterType
+{
+  const std::string & getSwitchOption (unsigned int i) const
+  {
+  } unsigned int getSwitchOptionCount () const
+  {
+  } int checkSwitched (const std::string & value) const;
+};
+
+int
+CLIParameterType::checkSwitched (const std::string & value) const const
+{
+  int contains = false;
+  for (unsigned int i = 0; !contains && i < getSwitchOptionCount () ;)
+    contains = getSwitchOption (i) == value;
+}
Index: gcc/tree-ssa-strlen.c
===================================================================
--- gcc/tree-ssa-strlen.c	(revision 237069)
+++ gcc/tree-ssa-strlen.c	(working copy)
@@ -1867,6 +1867,8 @@ handle_builtin_memcmp (gimple_stmt_itera
     {
       gimple *ustmt = USE_STMT (use_p);
 
+      if (is_gimple_debug (ustmt))
+	continue;
       if (gimple_code (ustmt) == GIMPLE_ASSIGN)
 	{
 	  gassign *asgn = as_a <gassign *> (ustmt);