I have created a dll in vs2019 c++. It has some exported function, and it has to call back a function in a specific event. It is imported in a Delphi project (it is written by another person). Evertyhing works well in x86, but it gives an Access violation error on the callback in x64 ..
Category : 64-bit
I’m chasing an odd performance glitch in a large, somewhat unfamiliar Win32 C++ codebase — I have a high-traffic, performance-critical method (an animation loop) that takes 10ms about 99% of the time, but 1% of the time it takes about 20ms, resulting in a visible glitch/stutter. This is a high-level method that branches out to ..
Problem Hello, this is my first stack overflow question. I’m using Bit-boards to represent board states in my chess engine. Currently I have a bit-board class like so: class Bitboard { public: uint64_t Board = 0ULL; void SetSquareValue(int Square) { Board |= (1ULL << Square); } void PrintBitbaord() { for (int rank = 0; rank ..
I am currently working on a Linux x64 gcc project splitted in two part: a library called myLib.a a model called model.so linking the previous library Those two parts are not compiled at same moment and not in the same environment (I don’t have control on model.so compilation instructions). Both uses struct defined in some ..
I used to work with C++ builder 10.1 (Embarcadero), with both 32-bit and 64-bit projects. Now I am trying C++ builder 10.4.2. Debugging 32-bit projects work fine, but on projects with 64-bit Target Platform the option “Attach to Process” is not working properly: There are no red dots beside my code, and the process I ..
This question is much asked and much answered, but I can’t find a single answer that really seems to get to the nub of the problem and which really answers the question as asked. Which is to say, if I simply Create New Project -> Console App -> (choose a name for the project) -> ..
i am trying to write a win 10 batch script which monitors a output of numbers in csv, 5 lines like 111.07 112.56 123.66 etc. The output happens every 60sec. (Optionally i can store that in a log.txt and call that in the script) Also I want to have the output numbers in absolute values ..
GMP cannot seem to allocate memory larger than this amount, despite being compiled in 64bit. I have a simple program that you can test this on, and whilst running it only seems to use up to 1500mb memory and no more. This should be able to calculate the number for even 32bit applications, however since ..
This code for example: int x = 75; int *p = &x; printf("%llxn",p); Writes a 64-bit number. What I’m asking is, what exactly is this number? Yes, it is an address. But is it an absolute address in virtual memory where the value 75 is stored? Or is it possibly offset from some page marker, ..
In MSVC there exist instrinsics __emulu() and _umul128(). First does u32*u32->u64 multiplication and second u64*u64->u128 multiplication. Do same intrinsics exist for CLang/GCC? Closest I found are _mulx_u32() and _mulx_u64() mentioned in Intel’s Guide. But they produce mulx instruction which needs BMI2 support. While MSVC’s intrinsics produce regular mul instruction. Also _mulx_u32() is not available in ..
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