November 18, 2014
This is a test of your knowledge of C++, not of your compiler's knowledge of C++. Using a compiler during this test will likely give you the wrong answers, or at least incomplete ones.
November 18, 2014
This is a test of your knowledge of C++, not of your compiler's knowledge of C++. Using a compiler during this test will likely give you the wrong answers, or at least incomplete ones.
Given the following code:
class Base {
public:
virtual ~Base() {}
virtual void DoSomething() {}
voi…November 18, 2014
This is a test of your knowledge of C++, not of your compiler's knowledge of C++. Using a compiler during this test will likely give you the wrong answers, or at least incomplete ones.
Using the code below as a reference, explain what behavior should be expected of each of the commented lines, pleas…
September 14, 2014
I generally don't post huge code dumps, mainly because I find them more annoying and less helpful than some books/authors might. But you know, I've been playing with IronPython/SlimDX recently and decided to do up another SlimDX Sample (demonstrating DX11), except in IronPython this time. This will…
September 14, 2014
So far I've covered how SlimGen works and the difficulties in doing what it does, including calling convention issues that one must be made aware of when writing replacement methods for use with SlimGen.
So the next question arises, just how much of a difference can using SlimGen make? Well, a lot o…
So the next question arises, just how much of a difference can using SlimGen make? Well, a lot o…
September 14, 2014
The question does arise though, when using SlimGen and writing your SSE replacement methods, what kind of calling convention does the CLR use?
The CLR uses a version of fastcall. On x86 processors this means that the first two parameters (that are DWORD or smaller) are passed in ECX and EDX. However…
The CLR uses a version of fastcall. On x86 processors this means that the first two parameters (that are DWORD or smaller) are passed in ECX and EDX. However…
September 14, 2014
So previously we delved into one of the nastier performance corners on the .Net framework. Today I'm going to introduce you to a tool, that is in development currently, which allows you to take those slow math functions of yours and replace them with high performance SSE optimized methods.
We've cal…
We've cal…
September 14, 2014
Imagine you could have the safety of managed code, and the speed of SIMD all in one? Sounds like one of those weird dreams Trent has, or perhaps you are already thinking of using C++/CLI to wrap SIMD methods to help reduce the unmanaged transition overhead. You might also be thinking about pinvokin…
September 14, 2014
As noted previously there are some cases where the performance of unmanaged code can beat that of the managed JIT. In the previous case it was the matrix multiplication function. We do have some other possible performance benefits we can give to our .NET code, specifically, we can NGEN it. NGEN is …
September 14, 2014
Integrating unmanaged code into the managed platform is one of the problem areas with the managed world. Often times the exact costs of calling into unmanaged code is unknown. This obviously leads to some confusion as to when it is appropriate to mix in unmanaged code to help to improve the perform…
September 14, 2014
Previously I discussed various potential issues the x86 JIT had with inlining non-trivial methods and functions taking or returning value types. In this entry I hope to cover some potential pitfalls facing would be optimizers, along with discussing some unexpected optimizations that do take place.O…
September 14, 2014
Introduction
.NET has been getting some interesting press recently. Even to the point where an article in Game Developer Magazine was published advocating the usage of managed code for rapid development of components. However, I did raise some issues with the author in regards to the performance met…
.NET has been getting some interesting press recently. Even to the point where an article in Game Developer Magazine was published advocating the usage of managed code for rapid development of components. However, I did raise some issues with the author in regards to the performance met…
September 14, 2014
Depends, but probably yes.
A beginning programmer should be focusing on learning to program. That is: the process of taking a concept and turning it into an application. Problem solving, in other words. Learning to program is not the same thing as learning a programming language. Learning a programm…
A beginning programmer should be focusing on learning to program. That is: the process of taking a concept and turning it into an application. Problem solving, in other words. Learning to program is not the same thing as learning a programming language. Learning a programm…
September 14, 2014
This is a very basic C++ quiz, it mainly tests a wee bit of knowldege that I've found some people who profess to have a mastery of C++ to be lacking. The answers should all be based on the C++ standard, and not your compiler's implementation.
Use the following code snippet to answer questions 1 thro…
Use the following code snippet to answer questions 1 thro…
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