From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sat, 17 Aug 2019 07:14:10 +0000 (+0100)
Subject: store mask in intermediary
X-Git-Tag: ls180-24jan2020~521
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f1e3b659571167f37a29a0340829395e6ed9bbae;p=ieee754fpu.git

store mask in intermediary
---

diff --git a/src/ieee754/part_mul_add/multiply.py b/src/ieee754/part_mul_add/multiply.py
index f0bb95b5..be736e8e 100644
--- a/src/ieee754/part_mul_add/multiply.py
+++ b/src/ieee754/part_mul_add/multiply.py
@@ -323,7 +323,10 @@ class AddReduce(Elaboratable):
             intermediate_terms.append(intermediate_term)
             m.d.comb += intermediate_term.eq(value)
 
-        part_mask = self._reg_partition_points.as_mask(len(self.output))
+        # store mask in intermediary (simplifies graph)
+        part_mask = Signal(len(self.output), reset_less=True)
+        mask = self._reg_partition_points.as_mask(len(self.output))
+        m.d.comb += part_mask.eq(mask)
 
         # create full adders for this recursive level.
         # this shrinks N terms to 2 * (N // 3) plus the remainder