wide-int: Fix build with gcc < 12 or clang++ [PR111787]

While my wide_int patch bootstrapped/regtested fine when I used GCC 12
as system gcc, apparently it doesn't with GCC 11 and older or clang++.
For GCC before PR96555 C++ DR1315 implementation the compiler complains
about template argument involving template parameters, for clang++ the
same + complains about missing needs_write_val_arg static data member
in some wi::int_traits specializations.

2023-10-12  Jakub Jelinek  <jakub@redhat.com>

	PR bootstrap/111787
	* tree.h (wi::int_traits <unextended_tree>::needs_write_val_arg): New
	static data member.
	(int_traits <extended_tree <N>>::needs_write_val_arg): Likewise.
	(wi::ints_for): Provide separate partial specializations for
	generic_wide_int <extended_tree <N>> and INL_CONST_PRECISION or that
	and CONST_PRECISION, rather than using
	int_traits <extended_tree <N> >::precision_type as the second template
	argument.
	* rtl.h (wi::int_traits <rtx_mode_t>::needs_write_val_arg): New
	static data member.
	* double-int.h (wi::int_traits <double_int>::needs_write_val_arg):
	Likewise.

1 files changed, 19 insertions, 4 deletions

diff --git a/gcc/tree.h b/gcc/tree.h
index e06a5c8..f7d2775 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -6237,6 +6237,7 @@ namespace wi
     static const enum precision_type precision_type = VAR_PRECISION;
     static const bool host_dependent_precision = false;
     static const bool is_sign_extended = false;
+    static const bool needs_write_val_arg = false;
   };
 
   template <int N>
@@ -6262,6 +6263,7 @@ namespace wi
       = N == ADDR_MAX_PRECISION ? INL_CONST_PRECISION : CONST_PRECISION;
     static const bool host_dependent_precision = false;
     static const bool is_sign_extended = true;
+    static const bool needs_write_val_arg = false;
     static const unsigned int precision = N;
   };
 
@@ -6293,8 +6295,14 @@ namespace wi
   tree_to_poly_wide_ref to_poly_wide (const_tree);
 
   template <int N>
-  struct ints_for <generic_wide_int <extended_tree <N> >,
-		   int_traits <extended_tree <N> >::precision_type>
+  struct ints_for <generic_wide_int <extended_tree <N> >, INL_CONST_PRECISION>
+  {
+    typedef generic_wide_int <extended_tree <N> > extended;
+    static extended zero (const extended &);
+  };
+
+  template <int N>
+  struct ints_for <generic_wide_int <extended_tree <N> >, CONST_PRECISION>
   {
     typedef generic_wide_int <extended_tree <N> > extended;
     static extended zero (const extended &);
@@ -6532,8 +6540,15 @@ wi::to_poly_wide (const_tree t)
 template <int N>
 inline generic_wide_int <wi::extended_tree <N> >
 wi::ints_for <generic_wide_int <wi::extended_tree <N> >,
-	      wi::int_traits <wi::extended_tree <N> >::precision_type
-	     >::zero (const extended &x)
+	      wi::INL_CONST_PRECISION>::zero (const extended &x)
+{
+  return build_zero_cst (TREE_TYPE (x.get_tree ()));
+}
+
+template <int N>
+inline generic_wide_int <wi::extended_tree <N> >
+wi::ints_for <generic_wide_int <wi::extended_tree <N> >,
+	      wi::CONST_PRECISION>::zero (const extended &x)
 {
   return build_zero_cst (TREE_TYPE (x.get_tree ()));
 }