From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Thu, 14 Feb 2019 09:42:00 +0000 (+0000)
Subject: add comments
X-Git-Tag: ls180-24jan2020~2015
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=dbb871d5dc6073145aa724c86cd584b63242a7eb;p=ieee754fpu.git

add comments
---

diff --git a/src/add/nmigen_add_experiment.py b/src/add/nmigen_add_experiment.py
index e475e6ba..bfc1c878 100644
--- a/src/add/nmigen_add_experiment.py
+++ b/src/add/nmigen_add_experiment.py
@@ -198,7 +198,9 @@ class FPADD:
                     m.next = "add_0"
 
             # ******
-            # First stage of add
+            # First stage of add.  covers same-sign (add) and subtract
+            # special-casing when mantissas are greater or equal, to
+            # give greatest accuracy.
 
             with m.State("add_0"):
                 m.next = "add_1"