From 17f5cbe781ae761d86d55fec7d46ba3172167894 Mon Sep 17 00:00:00 2001
From: Bobby Bingham <koorogi@koorogi.info>
Date: Sun, 8 Jan 2017 21:58:16 -0600
Subject: Add carry input to ALU

---
 alu_tb.v | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'alu_tb.v')

diff --git a/alu_tb.v b/alu_tb.v
index 31141ce..bfe3e8a 100644
--- a/alu_tb.v
+++ b/alu_tb.v
@@ -11,6 +11,7 @@ module alu_tb ();
 	reg expected_zero;
 	wire carry;
 	reg expected_carry;
+	reg carry_in;
 
 	reg [3*8:0] opstr;
 	integer file, r;
@@ -24,9 +25,12 @@ module alu_tb ();
 		while (!$feof(file)) begin
 			r = $fscanf(file, " 0x%x %3s 0x%x = 0x%x Z=%x C=%x\n", x, opstr, y, expected_result, expected_zero, expected_carry);
 
+			carry_in = opstr == "++" || opstr == "--";
 			case (opstr)
-				"+" : op = 0;
-				"-" : op = 1;
+				"+"  : op = 0;
+				"++" : op = 0;
+				"-"  : op = 1;
+				"--" : op = 1;
 				"*" : op = 2;
 				"/" : op = 3;
 				"&" : op = 4;
@@ -59,6 +63,7 @@ module alu_tb ();
 		.op(op),
 		.x(x),
 		.y(y),
+		.carry_in(carry_in),
 		.result(result),
 		.zero(zero),
 		.carry(carry)
-- 
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