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
I'm looking at the following disassembled AArch64 instruction: 65 6E 20 2B adds w5, w19, w0, uxtx #3 According to the ARM manual, uxtx zero-extends w0 to an
How do I create a text file that updates values inputted to by the user using Irvine's library? for example for my data I have: .data frstValue BYTE "Enter f
I want to inspect the assembly output of applying boost::variant in my code in order to see which intermediate calls are optimized away. When I compile the fol
I'm new to C++ programming and have always wanted to write a system information program for MS-DOS. I'm currently using the latest DigiMars C++ compiler and MA
Are x64 registers interchangable, in the sense that any instruction that works with one combination of them will work with any other? Is there performance diffe
I was originally trying to generate the bytes for an immediate move into a 64 bit register.The specific operation I wanted was mov rdi, 0x1337 Using https://ww
Going through the shellcode article on wikipedia, it gives an example as follows: B8 01000000 MOV EAX,1 // Set the register EAX to 0x000000001 To
When I try to build my source into a 32-bit static executable for Linux with nasm -f elf -F dwarf -g loop.asm ld -m elf_i386 -o loop loop.o I get this R_386_
In the case that a load overlaps two earlier stores (and the load is not fully contained in the oldest store), can modern Intel or AMD x86 implementations forwa
After reading this post (answer on StackOverflow) (at the optimization section), I was wondering why conditional moves are not vulnerable for Branch Prediction
I'm doing micro-optimization on a performance critical part of my code and came across the sequence of instructions (in AT&T syntax): add %rax, %rbx mov %r
At this point i have been learning assembly for about 6 months. My current project is a random number generator. I need to generate 1 random n
So im reading the user's 8-digit input, and saving it into a variable. for example: Enter an 8-digit hex number: 1ABC5678 So, then i loop through the 1ABC5678 h
I'm looking at some practice code for assembly, and the assignment is basically to replace one jump point with another. The original jmp is a SHORT jmp, and th