From d1556b964a43cb1da2e7e1c077d9f59f206fb30e Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Tue, 11 Jul 2017 18:58:35 -0500
Subject: [PATCH] Explain/remove no-iname-reduction FIXME [ci skip]

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

diff --git a/loopy/preprocess.py b/loopy/preprocess.py
index 69e045e64..ced1aaaa1 100644
--- a/loopy/preprocess.py
+++ b/loopy/preprocess.py
@@ -1730,7 +1730,10 @@ def realize_reduction(kernel, insn_id_filter=None, unknown_types_ok=True,
                     "Empty reduction found (no inames to reduce over). "
                     "Eliminating.")
 
-            # FIXME: return a neutral element.
+            # We're not supposed to reduce/sum at all. (Note how this is distinct
+            # from an empty reduction--there is an element here, just no inames
+            # to reduce over. It's rather similar to an array with () shape in
+            # numpy.)
 
             return expr.expr
 
-- 
GitLab