Linked Questions

I have tried writing my first assembly program (NASM x86 assembly). It is an linear congruential generator, or the plan was that is is one. Because of limitations of my assembly skills I had to change ...

I'm trying to optimize the runtime of the code that I wrote for computing the number of iterations it takes to reach 1 in the collatz conjecture Here is my psudeocode for this int threexplusone(int x){...

There are plenty of performance questions on this site already, but it occurs to me that almost all are very problem-specific and fairly narrow. And almost all repeat the advice to avoid premature ...

I was looking for the fastest way to popcount large arrays of data. I encountered a very weird effect: Changing the loop variable from unsigned to uint64_t made the performance drop by 50% on my PC. ...

I'm looking for detailed information regarding the size of basic C++ types. I know that it depends on the architecture (16 bits, 32 bits, 64 bits) and the compiler. But are there any standards for C++?...

One of the stated reasons for knowing assembler is that, on occasion, it can be employed to write code that will be more performant than writing that code in a higher-level language, C in particular. ...

How does one do this? If I want to analyze how something is getting compiled, how would I get the emitted assembly code?

I tried to compare the performance of inline assembly language and C++ code, so I wrote a function that add two arrays of size 2000 for 100000 times. Here's the code: #define TIMES 100000 void calcuC(...

I have a question for all the hardcore low level hackers out there. I ran across this sentence in a blog. I don't really think the source matters (it's Haack if you really care) because it seems to ...

I've been racking my brain for a week trying to complete this assignment and I'm hoping someone here can lead me toward the right path. Let me start with the instructor's instructions: Your ...

I've been reading about div and mul assembly operations, and I decided to see them in action by writing a simple program in C: File division.c #include <stdlib.h> #include <stdio.h> int ...

All the following instructions do the same thing: set %eax to zero. Which way is optimal (requiring fewest machine cycles)? xorl %eax, %eax mov $0, %eax andl $0, %eax

I don't want to optimize anything, I swear, I just want to ask this question out of curiosity. I know that on most hardware there's an assembly command of bit-shift (e.g. shl, shr), which is a single ...

I'm currently working on a project and I have the following issue. I have a C++ method that I want to work in two different ways : void MyFunction() { foo(); bar(); foobar(); } void ...

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 following example (with GCC 5.3 using g++ -...