From 6d9b194417d8bd76c45e5c6391a847ffd1f0d136 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Sat, 18 Apr 2015 19:39:48 -0500
Subject: [PATCH] Fix precompute after prior simplification

---
 loopy/precompute.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/loopy/precompute.py b/loopy/precompute.py
index ce6711f07..04461bce9 100644
--- a/loopy/precompute.py
+++ b/loopy/precompute.py
@@ -344,11 +344,11 @@ def precompute(kernel, subst_use, sweep_inames=[], within=None,
 
     # {{{ process invocations in footprint generators, start access_descriptors
 
-    access_descriptors = []
-
     if footprint_generators:
         from pymbolic.primitives import Variable, Call
 
+        access_descriptors = []
+
         for fpg in footprint_generators:
             if isinstance(fpg, Variable):
                 args = ()
@@ -374,8 +374,10 @@ def precompute(kernel, subst_use, sweep_inames=[], within=None,
         import loopy as lp
         for insn in kernel.instructions:
             if isinstance(insn, lp.ExpressionInstruction):
+                invg(insn.assignee, insn.id, insn.tags)
                 invg(insn.expression, insn.id, insn.tags)
 
+        access_descriptors = invg.access_descriptors
         if not access_descriptors:
             raise RuntimeError("no invocations of '%s' found" % subst_name)
 
-- 
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