From 8ca6a10eff485e3ab3b3e7f07073877be7eef58a Mon Sep 17 00:00:00 2001
From: Rokas Puzonas <rokas.puz@gmail.com>
Date: Sun, 7 May 2023 15:49:44 +0300
Subject: [PATCH] add example '53_add_loop_challenge'

---
 examples/53_add_loop_challenge.asm | 35 ++++++++++++++++++++++++++++++
 examples/53_add_loop_challenge.txt | 35 ++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 examples/53_add_loop_challenge.asm
 create mode 100644 examples/53_add_loop_challenge.txt

diff --git a/examples/53_add_loop_challenge.asm b/examples/53_add_loop_challenge.asm
new file mode 100644
index 0000000..b69d75f
--- /dev/null
+++ b/examples/53_add_loop_challenge.asm
@@ -0,0 +1,35 @@
+; ========================================================================
+;
+; (C) Copyright 2023 by Molly Rocket, Inc., All Rights Reserved.
+;
+; This software is provided 'as-is', without any express or implied
+; warranty. In no event will the authors be held liable for any damages
+; arising from the use of this software.
+;
+; Please see https://computerenhance.com for further information
+;
+; ========================================================================
+
+; ========================================================================
+; LISTING 53
+; ========================================================================
+
+bits 16
+
+mov dx, 6
+mov bp, 1000
+
+mov si, 0
+init_loop_start:
+	mov word [bp + si], si
+	add si, 2
+	cmp si, dx
+	jnz init_loop_start
+
+mov bx, 0
+mov si, dx
+sub bp, 2
+add_loop_start:
+	add bx, word [bp + si]
+	sub si, 2
+	jnz add_loop_start
\ No newline at end of file
diff --git a/examples/53_add_loop_challenge.txt b/examples/53_add_loop_challenge.txt
new file mode 100644
index 0000000..13848ac
--- /dev/null
+++ b/examples/53_add_loop_challenge.txt
@@ -0,0 +1,35 @@
+--- test\listing_0053_add_loop_challenge execution ---
+mov dx, 6 ; dx:0x0->0x6 ip:0x0->0x3
+mov bp, 1000 ; bp:0x0->0x3e8 ip:0x3->0x6
+mov si, 0 ; ip:0x6->0x9
+mov word [bp+si], si ; ip:0x9->0xb
+add si, 2 ; si:0x0->0x2 ip:0xb->0xe
+cmp si, dx ; ip:0xe->0x10 flags:->CPAS
+jne $-7 ; ip:0x10->0x9
+mov word [bp+si], si ; ip:0x9->0xb
+add si, 2 ; si:0x2->0x4 ip:0xb->0xe flags:CPAS->
+cmp si, dx ; ip:0xe->0x10 flags:->CAS
+jne $-7 ; ip:0x10->0x9
+mov word [bp+si], si ; ip:0x9->0xb
+add si, 2 ; si:0x4->0x6 ip:0xb->0xe flags:CAS->P
+cmp si, dx ; ip:0xe->0x10 flags:P->PZ
+jne $-7 ; ip:0x10->0x12
+mov bx, 0 ; ip:0x12->0x15
+mov si, dx ; ip:0x15->0x17
+sub bp, 2 ; bp:0x3e8->0x3e6 ip:0x17->0x1a flags:PZ->
+add bx, [bp+si] ; bx:0x0->0x4 ip:0x1a->0x1c
+sub si, 2 ; si:0x6->0x4 ip:0x1c->0x1f
+jne $-5 ; ip:0x1f->0x1a
+add bx, [bp+si] ; bx:0x4->0x6 ip:0x1a->0x1c flags:->P
+sub si, 2 ; si:0x4->0x2 ip:0x1c->0x1f flags:P->
+jne $-5 ; ip:0x1f->0x1a
+add bx, [bp+si] ; ip:0x1a->0x1c flags:->P
+sub si, 2 ; si:0x2->0x0 ip:0x1c->0x1f flags:P->PZ
+jne $-5 ; ip:0x1f->0x21
+
+Final registers:
+      bx: 0x0006 (6)
+      dx: 0x0006 (6)
+      bp: 0x03e6 (998)
+      ip: 0x0021 (33)
+   flags: PZ