From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Tue, 23 Jul 2019 15:43:45 +0000 (+0100)
Subject: add more fpsqrt specialcases
X-Git-Tag: ls180-24jan2020~749
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=11433357838a8812c0644b92bd4e256e608e76e9;p=ieee754fpu.git

add more fpsqrt specialcases
---

diff --git a/src/ieee754/fpdiv/specialcases.py b/src/ieee754/fpdiv/specialcases.py
index 47e87abb..5c491638 100644
--- a/src/ieee754/fpdiv/specialcases.py
+++ b/src/ieee754/fpdiv/specialcases.py
@@ -114,6 +114,11 @@ class FPDIVSpecialCasesMod(Elaboratable):
                 m.d.comb += self.o.out_do_z.eq(1)
                 m.d.comb += self.o.z.inf(sabx)
 
+            # if a is NaN return NaN
+            with m.If(a1.is_nan):
+                m.d.comb += self.o.out_do_z.eq(1)
+                m.d.comb += self.o.z.nan(0)
+
             # if a is zero return zero
             with m.Elif(a1.is_zero):
                 m.d.comb += self.o.out_do_z.eq(1)