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diff --git a/openpower/sv/vector_ops.mdwn b/openpower/sv/vector_ops.mdwn
index d92de32faa25da1d2b7794053581413c168d6549..62e988cf54002db31110e926297e8034d1c8a523 100644 (file)
--- a/openpower/sv/vector_ops.mdwn
+++ b/openpower/sv/vector_ops.mdwn
@@ -65,6 +65,10 @@ result.
         or result, result, t1
         srr r3, r3, 1 # shift r3 predicate up by one
 
+To investigate:
+
+* <https://stackoverflow.com/questions/39266476/how-to-speed-up-this-histogram-of-lut-lookups>
+
 ## iota
 
 Based on RVV vmiota.  vmiota may be viewed as a cumulative variant of popcount, generating multiple results.  successive iterations include more and more bits of the bitstream being tested.