From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 20 Feb 2019 00:45:56 +0000 (+0000)
Subject: store roundz test in comb variable
X-Git-Tag: ls180-24jan2020~1862
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=606bf9eb6eba1ff0cbb2afcaa0a3d05c07f43bf2;p=ieee754fpu.git

store roundz test in comb variable
---

diff --git a/src/add/fpbase.py b/src/add/fpbase.py
index 1da10b02..ee8857c8 100644
--- a/src/add/fpbase.py
+++ b/src/add/fpbase.py
@@ -308,7 +308,9 @@ class FPBase:
         """ performs rounding on the output.  TODO: different kinds of rounding
         """
         m.next = next_state
-        with m.If(of.guard & (of.round_bit | of.sticky | z.m[0])):
+        roundz = Signal(reset_less=True)
+        m.d.comb += roundz.eq(of.guard & (of.round_bit | of.sticky | z.m[0]))
+        with m.If(roundz):
             m.d.sync += z.m.eq(z.m + 1) # mantissa rounds up
             with m.If(z.m == z.m1s): # all 1s
                 m.d.sync += z.e.eq(z.e + 1) # exponent rounds up