From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Tue, 23 Jul 2019 15:43:04 +0000 (+0100)
Subject: add more fpsqrt specialcases
X-Git-Tag: ls180-24jan2020~750
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3e65b565b5ff8fd0fd8f1fe3090202ed4bf39de5;p=ieee754fpu.git

add more fpsqrt specialcases
---

diff --git a/src/ieee754/fpdiv/specialcases.py b/src/ieee754/fpdiv/specialcases.py
index 56a76657..47e87abb 100644
--- a/src/ieee754/fpdiv/specialcases.py
+++ b/src/ieee754/fpdiv/specialcases.py
@@ -108,6 +108,17 @@ class FPDIVSpecialCasesMod(Elaboratable):
             with m.If(a1.s):
                 m.d.comb += self.o.out_do_z.eq(1)
                 m.d.comb += self.o.z.nan(0)
+
+            # if a is inf return inf
+            with m.Elif(a1.is_inf):
+                m.d.comb += self.o.out_do_z.eq(1)
+                m.d.comb += self.o.z.inf(sabx)
+
+            # if a is zero return zero
+            with m.Elif(a1.is_zero):
+                m.d.comb += self.o.out_do_z.eq(1)
+                m.d.comb += self.o.z.zero(0)
+
             # Denormalised Number checks next, so pass a/b data through
             with m.Else():
                 m.d.comb += self.o.out_do_z.eq(0)