[gcc/devel/rust/master] Each intrinsic needs marked as const

[Thomas Schwinge]

https://gcc.gnu.org/g:d4e80fd645a9b4cac48957283e820f23d6e18aab

commit d4e80fd645a9b4cac48957283e820f23d6e18aab
Author: Philip Herron <philip.herron@embecosm.com>
Date:   Mon Jul 25 12:59:15 2022 +0100

    Each intrinsic needs marked as const
    
    These intrinsics and builtin's need to be marked as const in order for the
    const eval code to generate copy's to cache their results and folded
    function bodies.

Diff:
---
 gcc/rust/backend/rust-compile-base.cc      | 2 ++
 gcc/rust/backend/rust-compile-intrinsic.cc | 8 ++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/gcc/rust/backend/rust-compile-base.cc b/gcc/rust/backend/rust-compile-base.cc
index ab330c45668..cde0f085307 100644
--- a/gcc/rust/backend/rust-compile-base.cc
+++ b/gcc/rust/backend/rust-compile-base.cc
@@ -701,6 +701,8 @@ HIRCompileBase::compile_constant_item (
 
       gcc_assert (TREE_CODE (bind_tree) == BIND_EXPR);
       DECL_SAVED_TREE (fndecl) = bind_tree;
+      DECL_DECLARED_CONSTEXPR_P (fndecl);
+      maybe_save_constexpr_fundef (fndecl);
 
       ctx->pop_fn ();
 
diff --git a/gcc/rust/backend/rust-compile-intrinsic.cc b/gcc/rust/backend/rust-compile-intrinsic.cc
index 61084b90f33..ae50c8a3c02 100644
--- a/gcc/rust/backend/rust-compile-intrinsic.cc
+++ b/gcc/rust/backend/rust-compile-intrinsic.cc
@@ -15,17 +15,18 @@
 // <http://www.gnu.org/licenses/>.
 
 #include "rust-compile-intrinsic.h"
-#include "fold-const.h"
-#include "langhooks.h"
 #include "rust-compile-context.h"
 #include "rust-compile-type.h"
 #include "rust-compile-fnparam.h"
 #include "rust-builtins.h"
 #include "rust-diagnostics.h"
 #include "rust-location.h"
+#include "rust-constexpr.h"
 #include "rust-tree.h"
 #include "tree-core.h"
 #include "print-tree.h"
+#include "fold-const.h"
+#include "langhooks.h"
 
 namespace Rust {
 namespace Compile {
@@ -213,6 +214,9 @@ finalize_intrinsic_block (Context *ctx, tree fndecl)
   DECL_SAVED_TREE (fndecl) = bind_tree;
 
   ctx->push_function (fndecl);
+
+  DECL_DECLARED_CONSTEXPR_P (fndecl);
+  maybe_save_constexpr_fundef (fndecl);
 }
 
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