An assembly language is a low-level programming language for a computer, or other programmable device, in which there is a very strong (generally one-to-one) correspondence between the language and the architecture's machine code instructions.
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Finding multiples of 3 or 5 with MIPS assembly (Project Euler #1)
I just started learning MIPS assembly at my university and I would like some feedback on this code. The program is Project Euler Problem #1, finding the sum of multiples of 3 or 5 less than 1000. It ...
9
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1answer
104 views
A low tech approach to measuring game speed
Whilst developing a game I needed a delay routine capable of doing delays
ranging from 0.5 sec to just a few msec. The obvious choice was to use
the BIOS delay function 86h on int 15h. In a true real ...
12
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1answer
81 views
Embedded FizzBuzz
Recently, I have started to enter the realms of embedded systems programming. And, as my first major project, I thought I'd do the obvious: FizzBuzz.
However, this is a little different: this is a ...
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2answers
72 views
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1answer
46 views
Assembling a Sequence
I've completed the "Sequence Counter" level of TIS-100, but this is horrendously inefficient. My cycle counts are at about twice the minimum possible according to the charts:
I'm not really as ...
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2answers
125 views
Inefficient differential converter
Following Pimgd's question, I decided to take a look at the TIS-100 myself.
This is my solution to the 3rd challenge, building a differential converter.
Requirements:
Read values from IN.A and ...
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2answers
71 views
Filling a memory segment with a bit pattern
I want to fill a memory segment with a certain byte pattern using powerpc assembly:
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5answers
2k views
The loaderless bootloader
I began this month with trying to discover how shellcode is made. My search led me to wanting to learn assembly, so I wrote a simple bootloader with NASM:
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6
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1answer
55 views
Monte Carlo Pi (MASM)
I'm currently trying to brush up on my assembly skills and, being at the FPU section of the tutorial, I implemented a very basic version of a Monte-Carlo-Algorithm to compute pi. I deliberately use ...
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2answers
4k views
Counting Sequence Length in TIS-100
I picked up a programming game, TIS-100. Programming manual can be found on Steam as well, but I have described the relevant syntax in my question.
Basically, you're dealing with some old machine ...
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2answers
112 views
Assembler for Hack Assembly Language in Python
My Python implementation of for Hack Assembly Language. See this question for the Java implementation. Any comment about best practices and performance improvement?
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10
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3answers
119 views
Distance between two n-dimensional points (NASM)
I just finished writing a function that computes the distance between two n-dimensional points.
The original one was written in C and it's basically a translation of this formula:
...
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1answer
59 views
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1answer
134 views
A Virtual Piano
I have created a virtual piano that turns the home row (excluding 'g' and 'h') and the top row (excluding 'y' and 'u') of the user's keyboard in a piano's keyboard.
The home row is used for white ...
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0answers
76 views
Porting x86 assembly that is used to increment a value
I'm working on a port of some existing inline x86_64 assembly code to AArch64 compatible assembly and would appreciate the feedback. I'll post below the original x86 and my ported AArch64 code.
The ...
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2answers
101 views
Assembly Summation Implementation
I wrote a simple summation program in MARS to practice using loops and jump instructions. I feel like this is pretty lightweight and wanted some feedback on possible improvements:
Lowering ...
3
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2answers
46 views
Implementing OR with the lc-3
Today, something possessed me and I started learning assembly. My poison of choice is the lc-3, this is my very first program.
It is actually only the first part of a two part problem, but this ...
7
votes
2answers
292 views
Spinlock for C++ kernel (with x86 ASM)
This is some prototype code for a spin-lock for my toy operating system. Bear in mind this means there are no standard library routines to fall back on. It's also for C++11 compilation and will only ...
3
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2answers
145 views
Assembler for Hack Assembly Language - Take 2
I have been reading this great book and I decided to do the Project in Chapter 5: Writing an Assembler for the Hack Assembly Language.
You can find the specification for the Hack Machine Language and ...
8
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1answer
101 views
A BrainF*ck-ish compiler in C
-ish because I removed the input functionality from the compiler. And, the compiler does not support nested loops
I've been recently reading up on compilers and how they work.
Although this doesn't ...
6
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1answer
408 views
Assembler for Hack Assembly Language
I have been reading this great book and I decided to do the Project in Chapter 5: Writing an Assembler for the Hack Assembly Language.
You can find the specification for the Hack Machine Language and ...
3
votes
1answer
367 views
Binary to ASCII converter
This is a program I wrote to convert binary to ASCII. I am still learning ARM assembly. How can I improve my program? Are there any bad programming habits in my code?
I've tested it on Raspberry Pi ...
3
votes
1answer
226 views
MIPS assembly addition program
I am new to assembly and have made a simple addition program to sum two integers read from the keyboard. The program outputs correctly, but I want to know if there is a way to streamline my code. It ...
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2answers
335 views
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1answer
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1answer
61 views
Improved countdown program in x86 NASM
A while back, I posted a question involving code of the same function. This post contains improved code.
From the last post, I have improved size, my work with conventions, and my comments. I was ...
5
votes
1answer
370 views
Printing prime numbers in Assembly
I am learning to code in the Assembly language for the x86 architecture. I currently know of a few registers and certain arithmetic operations like add, sub, inc, dec, mov and to check for ...
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4answers
696 views
Countdown program in x86 NASM
I am fairly new to Assembly language programming and, for practice, I gave myself a problem: count down from 10 and right after 1, say "Blast off!".
...
14
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1answer
176 views
Calculating the harmonic average
In this program I was required to calculate the Harmonic Average using an assembly program with a C driver.
Harmonic mean is defined as:
$$ \frac{n}{\dfrac{1}{x_1} + \dfrac{1}{x_2} + \cdots + ...
12
votes
2answers
321 views
Find binary sequences with low peak sidelobe level of autocorrelation function
I would like to find all binary sequences from the specified range, which has low peak sidelobe level of its autocorrelation function.
Here is the solution (this is simplified version of the real ...
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3answers
632 views
Reverse Polish Notation Compiler
Description
A reverse polish notation based compiler.
Very small subset of forth
This is a proof of concept level compiler, no optimizations or over/underflow checking
see the embedded POD for more ...
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2answers
2k views
Checking substring in 8086 ASM
I have tried like this to check a substring in a mainstring in 8086. Is there any shorter way of doing this? My implementation seems lengthy.
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2answers
886 views
16-bit FizzBuzz in x86 NASM assembly
Since this problem involves small numbers (particularly with a small loop count of 100), it's possible to ease the modulo operation setup by simply working with 16-bit and 8-bit registers:
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12
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2answers
445 views
x64 Assembly - checking for largest prime factor
Using x64 assembly, I solved the Largest Prime Factor problem on Project Euler.
The problem is as follows:
The prime factors of 13195 are 5, 7, 13 and 29.
What is the largest prime factor of ...
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1answer
137 views
Inline assembly correctness (especially __volatile__)
Here's my inline-assembly functions, which is used my x86 32bit kernel.
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3answers
2k views
Integer square root in x86 assembly (NASM)
This program calculates the square root of an unsigned 32-bit number with some bit fiddling to get a very close approximation, then one iteration of the Babylonian method to get an exact value. I ...
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votes
2answers
2k views
String length calculation implementation in Assembly (NASM)
I just made a working implementation of calculating a string's length, but I'm not exactly sure it's the most efficient way. I divide the string up in blocks of four bytes each (32 bits), and add 4 to ...
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votes
3answers
2k views
32-bit factorial calculator in x86 NASM assembly
This is how it handles input:
if negative, terminate program
if 0-2, display input without calculating
if greater than or equal to 3, calculate and display result
I have also used some macros from ...
20
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1answer
727 views
Stack implemented using linked list in x86_64 assembly
I wrote a stack implementation using a singly linked list in x86_64 assembly. This stack supports the usual push/pop operations ...
12
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1answer
1k views
Linux NASM assembly linked list implementation
Inspired by all of the lovely linked lists lately, I decided to implement one in assembly language. This code maintains two linked lists - one is a free store and the other is the active linked list. ...
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votes
2answers
310 views
Is this C++ program correctly implemented in SSE?
I have to implement a simple program in SSE, and I don't know if I have done it in the right way (it's my first program in SSE).
This is the C++ program:
...
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2answers
465 views
Alp in MASM 8086
If the number is present, the output should show the numbers that are not present.
...
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1answer
183 views
Switch-case Monstrosity for CPU Emulator
I am still working on A Z80 CPU emulator and I have decided to prototype it in javascript and then translate it into a faster language, It might be ported to C but more likely is Java - this means I ...
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2answers
545 views
Search procedure to find inputted DWORD in MASM Array
Is there any way to make this more efficient?
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1answer
155 views
Counter in FASM assembly
I am making a simple counter in assembly. It counts to a billion and exits. However, the performance of this is really horrible. A Java application (that does the same) outperforms it by around 10x. ...
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votes
2answers
146 views
Improvements/suggestions for my CPU emulator
I am trying to emulate a basic CPU (Z80) as close as possible. It currently does not read real assembly code, but that will be implemented. If you have any views on how that could be implemented, ...
7
votes
1answer
968 views
Iterating string characters and passing them to a BIOS API
Which style of printing strings from the SI registry in NASM is more correct?
I'm learning assembly and x86 architecture, but I'm rather new in it, so I've prepared two styles (in NASM) of printing a ...
8
votes
1answer
190 views
Embedded conditional code compaction
I'm porting some AVR code from PROGMEM/PGM_P to __flash, and I want to reduce the amount of ...
4
votes
1answer
335 views
Is this CPUID parser ideal for any usage?
NOTE: I'm not perfectly sure of some of the parsed data, so any corrections are more than welcome.
Parser (cpuid.c):
...
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2answers
354 views
Polling for Nios 2
The program listens to the Altera FPGA DE2 board's keys that can start and stop and reset a counter:
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