inlining

Virtual function declared in a derived class

由 旧街凉风 提交于 2019-12-23 01:14:27
问题 Here I have declared another virtual function in Derived class. #include <iostream> using namespace std; class A{ string s; public: A(const string& name) : s(name){} virtual void f1(){cout << "f1 of base class" << endl;}; }; class B : public A{ string p; public: B(const string& name) : A(name){} virtual void f2(){cout << "virtual function of derived class" << endl;} void f1(){cout << "f1 of derived class";} }; int main() { A* arr[] = {new A("John"),new B("Bob")}; arr[0]->f1(); arr[1]->f1();

Property / Method inlining and impact on Reflection

由 倖福魔咒の 提交于 2019-12-21 09:17:29
问题 My answer to one of the question on SO was commented by Valentin Kuzub, who argues that inlining a property by JIT compiler will cause the reflection to stop working. The case is as follows: class Foo { public string Bar { get; set; } public void Fuzz<T>(Expression<Func<T>> lambda) { } } Fuzz(x => x.Bar); Fuzz function accepts a lambda expression and uses reflection to find the property. It is a common practice in MVC in HtmlHelper extensions. I don't think that the reflection will stop

Inlining Functions [closed]

由 ≡放荡痞女 提交于 2019-12-19 05:48:40
问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . What is inlining? What is it used for? Can you inline something in C#? 回答1: What it is In the terms of C and C++ you use the inline keyword to tell the compiler to call a routine without the overhead of pushing

When Is MethodBase.GetCurrentMethod Reliable / Predictable?

由 吃可爱长大的小学妹 提交于 2019-12-12 20:04:12
问题 A method could get inlined; there is an attribute to prevent that ("there's an att for that"). However, apparently a method may also not get its own stack frame on x64 due to tail-call optimization by the JITter (http://www.hanselman.com/blog/ReleaseISNOTDebug64bitOptimizationsAndCMethodInliningInReleaseBuildCallStacks.aspx). Would this affect the behavior of MethodBase.GetCurrentMethod ? The discussions that I can find are mostly about inlining (When is a method eligible to be inlined by the

Why wrapping a function into a lambda potentially make the program faster?

由 别说谁变了你拦得住时间么 提交于 2019-12-10 20:59:18
问题 The title may be too general. I am benchmarking the following 2 statements on a large vector<unsigned> v : sort(v.begin(), v.end(), l); sort(v.begin(), v.end(), [](unsigned a, unsigned b) { return l(a, b); }); where l is defined as bool l(unsigned a, unsigned b) { return a < b; } The result surprises me: the second is as fast as sort(v.begin(), v.end()); or sort(v.begin(), v.end(), std::less<>()); while the first is significantly slower. My question is why wrapping the function in a lambda

Repeated evaluation of pure expression in IO action

由 本小妞迷上赌 提交于 2019-12-10 13:53:49
问题 I have a procedure that (a) does some IO, (b) constructs a lookup table, and (c) returns an IO action that uses the lookup table. But when compiled with -O , GHC (version 6.12.1) inlines the construction the lookup table, so that it is reevaluated for every call of the IO action. Example: module Main where import Data.Array import Data.IORef import Control.Monad makeAction getX getY sumRef = do x <- getX let a = listArray (0, 1000) [x ..] return $ do y <- getY modifyIORef sumRef (\sum -> sum

large performance drop with gcc, maybe related to inline

由 眉间皱痕 提交于 2019-12-10 02:48:58
问题 I'm currently experiencing some weird effect with gcc (tested version: 4.8.4). I've got a performance oriented code, which runs pretty fast. Its speed depends for a large part on inlining many small functions. Since inlining across multiple .c files is difficult ( -flto is not yet widely available), I've kept a lot of small functions (typically 1 to 5 lines of code each) into a common C file, into which I'm developing a codec, and its associated decoder. It's "relatively" large by my standard

To inline or not to inline

由 不羁岁月 提交于 2019-12-06 20:14:41
问题 I've been writing a few classes lately; and I was wondering whether it's bad practice, bad for performance, breaks encapsulation or whether there's anything else inherently bad with actually defining some of the smaller member functions inside a header (I did try Google!). Here's an example I have of a header I've written with a lot of this: class Scheduler { public: typedef std::list<BSubsystem*> SubsystemList; // Make sure the pointer to entityManager is zero on init // so that we can check

What's the difference between partial evaluation and function inlining in a functional language?

由 前提是你 提交于 2019-12-05 12:33:08
问题 I know that: Function inlining is to replace a function call with the function definition. Partial evaluation is to evaluate the known (static) parts of a program at compile time. There is a distinction between the two in imperative languages like C, where operators are distinct from functions. However, is there any difference between the two in functional languages like Haskell where operators are functions too? Is the only difference between the two that function inlining can be performed

large performance drop with gcc, maybe related to inline

由 淺唱寂寞╮ 提交于 2019-12-05 01:39:21
I'm currently experiencing some weird effect with gcc (tested version: 4.8.4). I've got a performance oriented code, which runs pretty fast. Its speed depends for a large part on inlining many small functions. Since inlining across multiple .c files is difficult ( -flto is not yet widely available), I've kept a lot of small functions (typically 1 to 5 lines of code each) into a common C file, into which I'm developing a codec, and its associated decoder. It's "relatively" large by my standard (about ~2000 lines, although a lot of them are just comments and blank lines), but breaking it into
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