Other Programming Languages
 
Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
User Name:
Password:
Remember me
Go Back   Dev Shed ForumsProgramming Languages - MoreOther Programming Languages

Reply
Add This Thread To:
  Del.icio.us   Digg   Google   Spurl   Blink   Furl   Simpy   Y! MyWeb 
Thread Tools Search this Thread Rate Thread Display Modes
 
Unread Dev Shed Forums Sponsor:
Stop making mediocre tutorials.The best tutorials are video! Camtasia Studio makes it easy to create engaging, buzz-building screen videos at any size, in any popular format. Download the free trial!
  #1  
Old April 11th, 2006, 07:13 PM
mike.php mike.php is offline
Registered User
Dev Shed Newbie (0 - 499 posts)
 
Join Date: Jul 2005
Location: Ontario, Canada
Posts: 6 mike.php User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: 2 h 58 m
Reputation Power: 0
Send a message via MSN to mike.php
Mathematical Assembly Language Program (Help).

Hey,

I'm writing assembly language code to run this pseudocode:
Code:
***************************************************
        * This program will run the structure:                  *
        *                                                                     *
        * while (a <= 10)                                              *
        * {                                                                   *
        *     if ((a +b) >= c)                                          *
        *     {                                                               *
        *            a = a - b                                             *
        *            c = c - 1                                             *
        *      }                                                              *
        *      else                                                          *
        *      {                                                              *
        *            a = a + b                                            *
        *            c = c + 1                                            *
        *      }                                                              *
        *            c = c + 10                                          *
        * }                                                                   *
        * with starting values of a = -2, b = 4, c = 0        *
        ***************************************************


Here is what I have written so far:

Code:

* This program will run the if structure:              


*data location starts at $8000
	ORG $8000
AVAL FCB -2
BVAL FCB 4
CVAL FCB 0
CINC FCB 10

*main program starts at $9000
	ORG $9000	
	LDS #$01FF	; initialize SP
	LDAA AVAL	; load the A register with the value of A
	LDAB CVAL	; load B with the value of C
	ADDA BVAL	; add B to A and store the result in A

WHILE	CMPA #10	; subtract 10 from value of A (running total)
	BLT  IF		; branch to IF if A is less than 10

IF	CMPA CVAL	; compare (A + B) to C
	BLT  ELSE	; branch to the else part if (a + b) < c
	SUBA BVAL       ; a = (a + b)-b
	SUBA BVAL	; a = a - b
	STAA AVAL	; save the A value
	DECB		; c = c - 1
	BRA NEXT	; skip the else code

ELSE	STAA AVAL	; a = a + b
	INCB		; c = c + 1
NEXT	ADDB CINC	; c= c + 10
ENDWHL	BRA WHILE	;loop back up	

DONE	BRA DONE	; stupid, but necessary
	END		; pseudo-op, tells the assembler that we're done


However, when I put it through the assembler, it doesn't run correctly.

Can anybody offer some suggestions to help me along?

Thanks

Reply With Quote
  #2  
Old April 11th, 2006, 09:02 PM
Lux Perpetua Lux Perpetua is offline
Contributing User
Dev Shed Beginner (1000 - 1499 posts)
 
Join Date: Feb 2004
Location: San Francisco Bay
Posts: 1,411 Lux Perpetua User rank is Major (30000 - 40000 Reputation Level)Lux Perpetua User rank is Major (30000 - 40000 Reputation Level)Lux Perpetua User rank is Major (30000 - 40000 Reputation Level)Lux Perpetua User rank is Major (30000 - 40000 Reputation Level)Lux Perpetua User rank is Major (30000 - 40000 Reputation Level)Lux Perpetua User rank is Major (30000 - 40000 Reputation Level)Lux Perpetua User rank is Major (30000 - 40000 Reputation Level)Lux Perpetua User rank is Major (30000 - 40000 Reputation Level)Lux Perpetua User rank is Major (30000 - 40000 Reputation Level)Lux Perpetua User rank is Major (30000 - 40000 Reputation Level) 
Time spent in forums: 3 Weeks 4 Days 17 h 25 m 19 sec
Reputation Power: 319
I've never seen that language before, so I'm having to assume some things. I think I see some errors already:

- The "BLT IF" seems to be a no-op: if true, it goes to IF (the next instruction), and if false, it just goes to the next statement (which happens to be IF), right? I think what you really want to do is branch to DONE if A > 10.
- After the first pass through the "if", register A no longer contains A + B, but you continue to use it as such.
- I don't understand "DONE BRA DONE". Isn't that a one-instruction infinite loop?

Reply With Quote
Reply

Viewing: Dev Shed ForumsProgramming Languages - MoreOther Programming Languages > Mathematical Assembly Language Program (Help).


Thread Tools  Search this Thread 
Search this Thread:

Advanced Search
Display Modes  Rate This Thread 
Rate This Thread:


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
View Your Warnings | New Posts | Latest News | Latest Threads | Shoutbox
Forum Jump

 Free IT White Papers!
 
Accelerating Trading Partner Performance
One in five. That's how many partner transactions have at least one error. That is an amazing statistic, particularly given the extraordinary leaps in innovation across the global supply chain during the past two decades. Download this white paper to learn more.

 
Competing on Analytics
This Tech Analysis is designed to help identify characteristics shared by analytics competitors, and includes information about 32 organizations that have made a commitment to quantitative, fact-based analysis.

 
Cost Effective Scaling with Virtualization and Coyote Point Systems
An overview of the industry trend toward virtualization, how server consolidation has increased the importance of application uptime and the steps being taken to integrate load balancing technology with virtualized servers.

 
Five Checkpoints to Implementing IP Telephony
Implementation planning for IP PBX software and IP telephony has become vital as businesses replace discontinued legacy PBX phone systems. This informative whitepaper outlines five "checkpoints" for any implementation plan that will help make IP communications a successful proposition.

 
Hosted Email Security: Staying Ahead of New Threats
In the last two years, email has become a fierce battleground between the nefarious forces of spam and malware, and the heroes of messaging protection. The spam volumes increased alarmingly every month, bringing clever new forms of phishing and virus propagation attacks.

 

Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
  
 





© 2003-2008 by Developer Shed. All rights reserved. DS Cluster 3 hosted by Hostway