I have a working C program that has the simple function that returns a d character encoded in a byte array. char foo() { return 'd'; } char byte_array[] = {0
I received a task in college to compare execution time for calculating SHA256 in C# and assembly. It is supposed to be a simple WPF app with file input and 2 bu
Consider the following code snippet #include <vector> #include <cstdlib> void __attribute__ ((noinline)) calculate1(double& a, int x) { a += x
I'm reading the mail list about LKMM: Add volatile_if(). The control dependency is somewhat subtle since it is easily forgotten by us developers. So I wonder i
I'm new to this assembly language emo8086 and I just wanna ask if there's something wrong about this code because I want to display the average grade, but the o
Background: I have been learning x86_64 assembly using NASM on a Linux system and was writing a subroutine for strlen(const char *str) I wanted to copy one byte
I am trying to load only the first byte in a register after data is passed into it for example if I have the following ASM code global _start section .data stri
After serious development, CPUs gained many cores, gained distributed blocks of cores on multiple chiplets, numa systems, etc but still a piece of data has to p
LUI (load upper immediate) is used to build 32-bit constants and uses the U-type format. LUI places the U-immediate value in the top 20 bits of the destinati
I'm doing some operating system tutorials from the book "Operating systems from 0 to 1". One of the exercises is to set the cursor to a position on the screen i
According to Intel in x64 the following registers are called general purpose registers (RAX, RBX, RCX, RDX, RBP, RSI, RDI, RSP and R8-R15) https://software.inte
I want to practice using switch/cases and JumpTables in MIPS. Currently, I am able to achieve a similar logic via stacking several BEQ commands after each other
I'm trying to write an assembly procedure to get the SMARTDrive version on a given system. The code to detect if SMARTDrive is loaded works correctly, but I ca
Suppose we have a variable in memory, which is constantly being updated by a thread of execution by doing something like MOV into it with alternating values (si
I have got a little problem of understanding how is suppose to work. Basically all what I need is to light up a led on each side of 7 segment display. They over
SORRY if i make you confuse about the question, but i don't know a better to describe it i'm trying to write a NASM program to reverse a string in place. i ha
I have a very basic knowledge about IDA and patching. From my understanding, I can change a line of code by doing Edit -> Patch program -> Assembly. But h
Is there a tool to compare the control flow of some disassembly and some C? Here's my situation: I started with the disassembly (x86_64) of a function. In some
I was studying the x86_64 assembly for the following function: /// Returns the greatest power of two less than or equal to `self`, or 0 otherwise. pub const fn
Is there an instruction or efficient branchless sequence of instructions to figure out the INDEX of (not the value of) the largest (or smallest) element of an u