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How to ensure the function return consistent floating point values in C/C++?


How to ensure the function return consistent floating point values in C/C++?

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How to ensure the function return consistent floating point values in C/C++?
Tag : cpp , By : jaime
Date : November 24 2020, 03:41 PM


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Is floating-point math consistent in C#? Can it be?


Tag : chash , By : simonth
Date : March 29 2020, 07:55 AM
Does that help I know of no way to way to make normal floating points deterministic in .net. The JITter is allowed to create code that behaves differently on different platforms(or between different versions of .net). So using normal floats in deterministic .net code is not possible.
The workarounds I considered:

How do I return floating point values in NASM?


Tag : cpp , By : user186831
Date : March 29 2020, 07:55 AM
seems to work fine Use movsd to load a scalar double into an XMM register.
For the files:
#include <iostream>
using namespace std;
extern "C" double asmfunc();

double val = 123.321;

double dubidoo ()
{
    return val;
}

int main ()
{
    cout << "dubidoo: " << dubidoo() << endl;
    cout << "asmfunc: " << asmfunc() << endl;

    return 0;
}
segment .data
    val: dq 123.321

section .text
global asmfunc

asmfunc:
    movsd    xmm0, [val]
    ret
nasm -felf64 callee.asm
g++ Wl,callee.o caller.cpp
./a.out

How to ensure localculture is used for interface but not floating point values in WinForms?


Tag : chash , By : Daniel Reslie
Date : March 29 2020, 07:55 AM
Hope that helps You can alter any property of CultureInfo after creating it for specific culture, e.g.:
// create culture with default values for russian
var culture = new CultureInfo("ru-RU");
// change number format
culture.NumberFormat = new NumberFormatInfo { NumberDecimalSeparator = "." };
// set culture
Thread.CurrentThread.CurrentCulture = Thread.CurrentThread.CurrentUICulture = culture;
var test = double.Parse("1.234"); // would throw without changing NumberFormat
MessageBox.Show(test.ToString()); // output: 1.234

Is c++ floating point calculation consistent in android and iOS?


Tag : android , By : Pat
Date : March 29 2020, 07:55 AM

Is it possible in floating point to return 0.0 subtracting two different values?


Tag : cpp , By : leorick
Date : March 29 2020, 07:55 AM
I wish this help you The IEEE-754 standard was deliberately designed so that subtracting two values produces zero if and only if the two values are equal, except that subtracting an infinity from itself produces NaN and/or an exception.
Unfortunately, C++ does not require conformance to IEEE-754, and many C++ implementations use some features of IEEE-754 but do not fully conform.
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