From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sun, 17 Feb 2019 14:07:33 +0000 (+0000)
Subject: add TODO comment
X-Git-Tag: ls180-24jan2020~1927
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=20efd9f948e67d17b3718bb4c4a6b9175ab8aadb;p=ieee754fpu.git

add TODO comment
---

diff --git a/src/add/nmigen_add_experiment.py b/src/add/nmigen_add_experiment.py
index 8f075cf1..a751ea2e 100644
--- a/src/add/nmigen_add_experiment.py
+++ b/src/add/nmigen_add_experiment.py
@@ -115,6 +115,9 @@ class FPADD(FPBase):
                     # This one however (single-cycle) will do the shift
                     # in one go.
 
+                    # XXX TODO: the shifter used here is quite expensive
+                    # having only one would be better
+
                     ediff = Signal((len(a.e), True))
                     ediffr = Signal((len(a.e), True))
                     m.d.comb += ediff.eq(a.e - b.e)