fixed bug where register addresses were used instead of data

2 files changed, 4 insertions, 3 deletions

diff --git a/src/alu_op_decode.v b/src/alu_op_decode.v
index 8e801c8..895b952 100644
--- a/src/alu_op_decode.v
+++ b/src/alu_op_decode.v
@@ -19,7 +19,8 @@ parameter ALU_OP_ADD  = 4'b0000,
 
 
 always @ (*) begin
-  case (opcode)
+  if (alu_ctrl == 2'b00) alu_op <= ALU_OP_ADD;
+  else case (opcode)
     7'b0110011: begin // ADD, SUB, SLL, SLT, SLTU, XOR, SRL, SRA, OR, AND
       case (funct3)
         3'b000: alu_op <= funct7[5] ? ALU_OP_SUB : ALU_OP_ADD;
diff --git a/src/cpu.v b/src/cpu.v
index b839477..5362cf9 100644
--- a/src/cpu.v
+++ b/src/cpu.v
@@ -123,8 +123,8 @@ always @ (posedge clk or posedge rst) begin
     a_buf <= 32'b0;
     b_buf <= 32'b0;
   end else begin
-    a_buf <= rs1;
-    b_buf <= rs2;
+    a_buf <= rs1_data;
+    b_buf <= rs2_data;
   end
 end