[gcc r12-9173] Fix small regression in Ada

[gcc r12-9173] Fix small regression in Ada

[Eric Botcazou]

https://gcc.gnu.org/g:2155c14612ed63fc7e93d038f0a8fe01bb14fefb

commit r12-9173-g2155c14612ed63fc7e93d038f0a8fe01bb14fefb
Author: Eric Botcazou <ebotcazou@adacore.com>
Date:   Tue Feb 14 13:33:08 2023 +0100

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

Diff:
---
 gcc/gimplify.cc                  | 2 +-
 gcc/testsuite/gnat.dg/shift2.adb | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/gcc/gimplify.cc b/gcc/gimplify.cc
index a3aa90262c5..a551c574a2d 100644
--- a/gcc/gimplify.cc
+++ b/gcc/gimplify.cc
@@ -6373,7 +6373,7 @@ 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;