From e061bacc9d5c24e02b077582577d5040fada3847 Mon Sep 17 00:00:00 2001
From: David Harris <david_harris@hmc.edu>
Date: Fri, 23 Dec 2022 00:53:55 -0800
Subject: [PATCH] Fixed early termination on fdivsqrt

---
 pipelined/src/fpu/fdivsqrt/fdivsqrtfsm.sv | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/pipelined/src/fpu/fdivsqrt/fdivsqrtfsm.sv b/pipelined/src/fpu/fdivsqrt/fdivsqrtfsm.sv
index 6a7bbac2..8675e6ea 100644
--- a/pipelined/src/fpu/fdivsqrt/fdivsqrtfsm.sv
+++ b/pipelined/src/fpu/fdivsqrt/fdivsqrtfsm.sv
@@ -115,10 +115,10 @@ module fdivsqrtfsm(
           step <= cycles; 
           if (SpecialCaseE) state <= #1 DONE;
           else             state <= #1 BUSY;
-      end else if (state == BUSY) begin
-          if (step == 1)  state <= #1 DONE;
+      end else if (state == BUSY) begin 
+          if (step == 1 | WZeroM)  state <= #1 DONE; // finished steps or terminate early on zero residual
           step <= step - 1;
-      end else if ((state == DONE) | (WZeroM & (state == BUSY))) begin
+      end else if (state == DONE) begin
         if (StallM) state <= #1 DONE;
         else        state <= #1 IDLE;
       end