From cae9b54a91467c22220eca04f92cb1a688684aa2 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Thu, 9 Jun 2016 19:42:39 -0500
Subject: [PATCH] Catch UnknownVariableError in simplify_using_aff

---
 loopy/symbolic.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/loopy/symbolic.py b/loopy/symbolic.py
index 400090f06..9a753a663 100644
--- a/loopy/symbolic.py
+++ b/loopy/symbolic.py
@@ -1090,6 +1090,8 @@ def simplify_using_aff(kernel, expr):
 
     domain = kernel.get_inames_domain(inames)
 
+    from pymbolic.mapper.evaluator import UnknownVariableError
+
     try:
         with isl.SuppressedWarnings(kernel.isl_context):
             aff = aff_from_expr(domain.space, expr)
@@ -1097,6 +1099,8 @@ def simplify_using_aff(kernel, expr):
         return expr
     except TypeError:
         return expr
+    except UnknownVariableError:
+        return expr
 
     # FIXME: Deal with assumptions, too.
     aff = aff.gist(domain)
-- 
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