From 75762e38a660f93bf6f9420b3cd99a59e2dc8925 Mon Sep 17 00:00:00 2001
From: Dominic Kempf <dominic.kempf@iwr.uni-heidelberg.de>
Date: Mon, 24 Oct 2016 10:46:57 +0200
Subject: [PATCH] Allow predicates=None for instructions

NoOpInstruction.__init__ set this to None and therefore does not work.
---
 loopy/kernel/instruction.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/loopy/kernel/instruction.py b/loopy/kernel/instruction.py
index 3221535ae..b409f446b 100644
--- a/loopy/kernel/instruction.py
+++ b/loopy/kernel/instruction.py
@@ -160,6 +160,9 @@ class InstructionBase(Record):
             within_inames = forced_iname_deps
             within_inames_is_final = forced_iname_deps_is_final
 
+        if predicates is None:
+            predicates = frozenset()
+
         new_predicates = set()
         for pred in predicates:
             if isinstance(pred, str):
-- 
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