From: Aleksandar Kostovic <alexandar.kostovic@gmail.com>
Date: Sun, 17 Feb 2019 15:00:29 +0000 (+0100)
Subject: Started to translate special cases
X-Git-Tag: ls180-24jan2020~1924
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c832b3bb72c5855b2c413ee3abef910a4e6eca45;p=ieee754fpu.git

Started to translate special cases
---

diff --git a/src/add/fmul.py b/src/add/fmul.py
index d41d974b..373f7976 100644
--- a/src/add/fmul.py
+++ b/src/add/fmul.py
@@ -57,55 +57,30 @@ class FPMUL(FPBase):
         		b.e.eq(b[23:31] - 127),
         		a.s.eq(a[31]),
         		b.s.eq(b[31])
-
+			]
+        	
+        	with m.State("special_cases"):
+        		m.next = "normalise_a"
+        		with m.If(a.is_nan() | b.is_nan()):
+        			m.next += "put_z"
+        			m.d.sync += [
+        			z[31].eq(1),
+        			z[23:31].eq(255),
+        			z[22].eq(1),
+        			z[0:22].eq(0)
         		]
-        		
+        		with m.Elif(a.e.is_inf()):
+        			m.next += "put_z"
+        			m.d.sync += [
+        			z[31].eq(a.s ^ b.s),
+        			z[23:31].eq(255),
+        			z[0:22].eq(0)
+				]
 """
-always @(posedge clk)
-  begin
-
-    case(state)
-
-      get_a:
-      begin
-        s_input_a_ack <= 1;
-        if (s_input_a_ack && input_a_stb) begin
-          a <= input_a;
-          s_input_a_ack <= 0;
-          state <= get_b;
-        end
-      end
-
-      get_b:
-      begin
-        s_input_b_ack <= 1;
-        if (s_input_b_ack && input_b_stb) begin
-          b <= input_b;
-          s_input_b_ack <= 0;
-          state <= unpack;
-        end
-      end
-
-      unpack:
-      begin
-        a_m <= a[22 : 0];
-        b_m <= b[22 : 0];
-        a_e <= a[30 : 23] - 127;
-        b_e <= b[30 : 23] - 127;
-        a_s <= a[31];
-        b_s <= b[31];
-        state <= special_cases;
-      end
 
       special_cases:
       begin
-        //if a is NaN or b is NaN return NaN 
-        if ((a_e == 128 && a_m != 0) || (b_e == 128 && b_m != 0)) begin
-          z[31] <= 1;
-          z[30:23] <= 255;
-          z[22] <= 1;
-          z[21:0] <= 0;
-          state <= put_z;
+
         //if a is inf return inf
         end else if (a_e == 128) begin
           z[31] <= a_s ^ b_s;