[Cryptech-Commits] [core/math/modexp] 01/05: cleanup of s mem write control.

[git at cryptech.is]

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joachim at secworks.se pushed a commit to branch perfopt
in repository core/math/modexp.

commit 5775903b6e158624799889fffa70555437df08ce
Author: Joachim Strömbergson <joachim at secworks.se>
Date:   Mon Jun 15 18:01:33 2015 +0200

    cleanup of s mem write control.
---
 src/rtl/montprod.v | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/rtl/montprod.v b/src/rtl/montprod.v
index 1b9346f..9b112f4 100644
--- a/src/rtl/montprod.v
+++ b/src/rtl/montprod.v
@@ -247,6 +247,7 @@ module montprod(
           add_carry_in_sm_reg <= add_carry_in_sm_new;
 
           B_bit_index_reg <= B_bit_index;
+
           q_reg <= q;
           b_reg <= b;
 
@@ -404,28 +405,28 @@ module montprod(
   always @*
     begin : s_writer
       shr_carry_in_new    = 1'b0;
-      s_mux_new        = SMUX_0;
+      s_mux_new     = SMUX_0;
       s_mem_we_new  = 1'b0;
 
       case (montprod_ctrl_reg)
         CTRL_INIT_S:
           begin
-            s_mem_we_new = 1'b1;
             s_mux_new    = SMUX_0; // write 0
+            s_mem_we_new = 1'b1;
           end
 
         CTRL_L_CALC_SM:
           begin
             //s = (s + q*M + b*A) >>> 1;, if(q==1) S+= M. Takes (1..length) cycles.
-            s_mem_we_new     = q_reg;
-            s_mux_new        = SMUX_ADD_SM;
+            s_mux_new    = SMUX_ADD_SM;
+            s_mem_we_new = q_reg;
           end
 
         CTRL_L_CALC_SA:
           begin
             //s = (s + q*M + b*A) >>> 1;, if(b==1) S+= A. Takes (1..length) cycles.
-            s_mem_we_new     = b_reg;
-            s_mux_new        = SMUX_ADD_SA;
+            s_mux_new    = SMUX_ADD_SA;
+            s_mem_we_new = b_reg;
           end
 
         CTRL_L_CALC_SDIV2: