From 47781a7047ebb00a47a8585147bce3e579e0f3a8 Mon Sep 17 00:00:00 2001
From: Dominic Kempf <dominic.kempf@iwr.uni-heidelberg.de>
Date: Mon, 28 Nov 2016 16:21:32 +0100
Subject: [PATCH] Make instructions hashable

---
 loopy/kernel/instruction.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/loopy/kernel/instruction.py b/loopy/kernel/instruction.py
index 417ff9dd3..c31d9d242 100644
--- a/loopy/kernel/instruction.py
+++ b/loopy/kernel/instruction.py
@@ -199,7 +199,7 @@ class InstructionBase(Record):
 
             new_predicates.add(pred)
 
-        predicates = new_predicates
+        predicates = frozenset(tuple(p for p in new_predicates))
         del new_predicates
 
         # }}}
@@ -431,6 +431,9 @@ class InstructionBase(Record):
         for field_name in sorted(self.fields):
             key_builder.rec(key_hash, getattr(self, field_name))
 
+    def __hash__(self):
+        return hash((type(self),) + tuple(getattr(self, field) for field in self.fields))
+
     # }}}
 
     def copy(self, **kwargs):
-- 
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