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When is assembly faster than C?
...les that still need compiler-specific code, see
Getting the high part of 64 bit integer multiplication: A portable version using uint64_t for 32x32 => 64-bit multiplies fails to optimize on a 64-bit CPU, so you need intrinsics or __int128 for efficient code on 64-bit systems.
_umul128 on Windo...
Alternatives to gprof [closed]
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@Norman: I made a profiler based on this, in C for DOS, around '93. I called it yet-another-performance-analyzer, and demo'ed it around at IEEE meetings, but that's as far as it went. There is a product from RotateRight called Zoom that's not too far o...
Undefined symbols for architecture arm64
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The issue is that the cocoapods have not been built for arm64 architecture yet thus they cannot be linked when you build them. Likely you cannot use those packages until they are updated and use that architecture. You can fix the linker error by going to project -> target (your ...
dispatch_after - GCD in Swift?
... with this answer, I had already compensated for its loss by writing a GCD-based cancelable timer (using a dispatch_source_t, because that's something you can cancel).
– matt
Dec 1 '15 at 16:43
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How to load images dynamically (or lazily) when users scrolls them into view
...rence Boston last year. AOL uses a tool called Sonar for on-demand loading based on scroll position. Check the code for the particulars of how it compares scrollTop (and others) to the element offset to detect if part or all of the element is visible.
jQuery Sonar
Dave talks about Sonar in these ...
How to send a correct authorization header for basic authentication
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Per https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding and http://en.wikipedia.org/wiki/Basic_access_authentication , here is how to do Basic auth with a header instead of putting the username and password in the URL. Note that this still doesn...
Windows x64编程中寄存器的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
Windows x64编程中寄存器的使用下面是摘自 MSDN 的文章，在Win64下的 registers 用途RegisterStatusUseRAXVolatileReturn value registerRCXVolatileFirst integer 下面是摘自 MSDN 的文章，在 Win64 下的 registers 用途
Register
Status
Use
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How to maintain aspect ratio using HTML IMG tag
...hoto in our application. I have set both its height and width attribute to 64. I need to show any image resolution (e.g. 256x256, 1024x768, 500x400, 205x246, etc.) as 64x64. But by setting the height and width attributes of an img tag to 64, it's not maintaining the aspect ratio, so the image looks ...
Can functions be passed as parameters?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Is there a way to detect if an image is blurry?
...ding off of Nike's answer. Its straightforward to implement the laplacian based method with opencv:
short GetSharpness(char* data, unsigned int width, unsigned int height)
{
// assumes that your image is already in planner yuv or 8 bit greyscale
IplImage* in = cvCreateImage(cvSize(width,he...