From f9333dce74e1a6035f834b5913e334a5bedca595 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Fri, 27 May 2016 10:14:57 -0500
Subject: [PATCH] Short-circuit expand_subst if no subst rules
---
loopy/transform/subst.py | 3 +++
1 file changed, 3 insertions(+)
diff --git a/loopy/transform/subst.py b/loopy/transform/subst.py
index 63e70f8e3..24fc0d40a 100644
--- a/loopy/transform/subst.py
+++ b/loopy/transform/subst.py
@@ -460,6 +460,9 @@ def assignment_to_subst(kernel, lhs_name, extra_arguments=(), within=None,
# {{{ expand_subst
def expand_subst(kernel, within=None):
+ if not kernel.substitutions:
+ return kernel
+
logger.debug("%s: expand subst" % kernel.name)
from loopy.symbolic import RuleAwareSubstitutionRuleExpander
--
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