================
@@ -0,0 +1,355 @@
+# 
===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# 
===----------------------------------------------------------------------===##
+
+import lit
+import os
+import re
+from .base import FileBasedTest
+
+
+def _getSubstitution(substitution, config):
+    """
+    Helper function to get a specific substitution from a config object.
+    """
+    for (orig, replacement) in config.substitutions:
+        if orig == substitution:
+            return replacement
+    raise ValueError("Substitution {} is not in the 
config.".format(substitution))
+
+
+def _appendToSubstitution(substitutions, key, value):
----------------
mordante wrote:

Should we also add `_prependToSubstitution` which is also in `dsl.py`?

https://github.com/llvm/llvm-project/pull/90803
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