urv_exec: improve speed of data bus.

f4a94d1b · Tristan Gingold · 7ff18ed7 · f4a94d1b
Commit f4a94d1b authored Feb 26, 2020 by Tristan Gingold
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Showing with 3 additions and 4 deletions

urv_exec.v rtl/urv_exec.v +3 -4

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--- a/rtl/urv_exec.v
+++ b/rtl/urv_exec.v
@@ -241,9 +241,6 @@ module urv_exec
       default: branch_condition_met <= 0;
     endcase // case (d_fun_i)

-   // generate load/store address
-   assign dm_addr = d_imm_i + ( ( d_opcode_i == `OPC_JALR || d_opcode_i == `OPC_LOAD || d_opcode_i == `OPC_STORE) ? rs1 : d_pc_i );
-
   // calculate branch target address
   always@*
     if (d_is_mret_i)
@@ -253,7 +250,7 @@ module urv_exec
     else if (d_is_ebreak_i && g_with_hw_debug)
       branch_target <= d_pc_i;
     else
-       branch_target <= dm_addr;
+       branch_target <= d_imm_i + (d_opcode_i == `OPC_JALR ? rs1 : d_pc_i);

   // decode ALU operands
   assign alu_op1 = d_use_op1_i ? d_alu_op1_i : rs1;
@@ -374,6 +371,8 @@ module urv_exec
       default: rd_value <= 32'hx;
     endcase // case (x_rd_source_i)

+   // generate load/store address
+   assign dm_addr = d_imm_i + rs1;

   reg unaligned_addr;