[gcc r13-5985] Fix small regression in Ada

[gcc r13-5985] Fix small regression in Ada

[Eric Botcazou]

https://gcc.gnu.org/g:1434eee54e57ad4839c0697f1294f9e8fe0a3044

commit r13-5985-g1434eee54e57ad4839c0697f1294f9e8fe0a3044
Author: Eric Botcazou <ebotcazou@adacore.com>
Date:   Tue Feb 14 13:27:18 2023 +0100

    Fix small regression in Ada
    
    gcc/
            * gimplify.cc (gimplify_save_expr): Add missing guard.
    gcc/ada/
            * gcc-interface/trans.cc (gnat_gimplify_expr): Add missing guard.
    gcc/testsuite/
            * gnat.dg/shift2.adb: New test.

Diff:
---
 gcc/ada/gcc-interface/trans.cc   | 4 +++-
 gcc/gimplify.cc                  | 2 +-
 gcc/testsuite/gnat.dg/shift2.adb | 8 ++++++++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/gcc/ada/gcc-interface/trans.cc b/gcc/ada/gcc-interface/trans.cc
index 28e3867d142..5fc1a26fede 100644
--- a/gcc/ada/gcc-interface/trans.cc
+++ b/gcc/ada/gcc-interface/trans.cc
@@ -9049,7 +9049,9 @@ gnat_gimplify_expr (tree *expr_p, gimple_seq *pre_p,
 
       /* Propagate TREE_NO_WARNING from expression to temporary by using the
 	 SAVE_EXPR itself as an intermediate step.  See gimplify_save_expr.  */
-      if (SAVE_EXPR_RESOLVED_P (expr))
+      if (type == void_type_node)
+	;
+      else if (SAVE_EXPR_RESOLVED_P (expr))
 	TREE_NO_WARNING (op) = TREE_NO_WARNING (expr);
       else
 	TREE_NO_WARNING (expr) = TREE_NO_WARNING (op);
diff --git a/gcc/gimplify.cc b/gcc/gimplify.cc
index 1b362dd83e3..96845154a92 100644
--- a/gcc/gimplify.cc
+++ b/gcc/gimplify.cc
@@ -6441,7 +6441,7 @@ gimplify_save_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
   gcc_assert (TREE_CODE (*expr_p) == SAVE_EXPR);
   val = TREE_OPERAND (*expr_p, 0);
 
-  if (TREE_TYPE (val) == error_mark_node)
+  if (val && TREE_TYPE (val) == error_mark_node)
     return GS_ERROR;
 
   /* If the SAVE_EXPR has not been resolved, then evaluate it once.  */
diff --git a/gcc/testsuite/gnat.dg/shift2.adb b/gcc/testsuite/gnat.dg/shift2.adb
new file mode 100644
index 00000000000..b45e4401813
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/shift2.adb
@@ -0,0 +1,8 @@
+-- { dg-do compile }
+
+with Interfaces; use Interfaces;
+
+function Shift2 (V : Unsigned_32) return Unsigned_32 is
+begin
+  return Shift_Left (V, (case V is when 0 => 1, when others => 0));
+end;