c++ Programming Glossary: processors

Why is processing a sorted array faster than an unsorted array?

http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array

complete. Then you continue down the correct path. Modern processors are complicated and have long pipelines. So they take forever..

Why isn't sizeof for a struct equal to the sum of sizeof of each member?

http://stackoverflow.com/questions/119123/why-isnt-sizeof-for-a-struct-equal-to-the-sum-of-sizeof-of-each-member

members are optimally aligned for better performance. Many processors perform best when fundamental data types are stored at byte..

How does C compute sin() and other math functions?

http://stackoverflow.com/questions/2284860/how-does-c-compute-sin-and-other-math-functions

sysdeps ieee754 dbl 64 s_sin.c The version for Intel x86 processors is written in assembly. It simply uses the FPU's built in fsin..

Microsecond resolution timestamps on Windows

http://stackoverflow.com/questions/2414359/microsecond-resolution-timestamps-on-windows

different results on different CPUs. There are also some processors that adjust their frequency for power saving which apparently..

Floating point vs integer calculations on modern hardware

http://stackoverflow.com/questions/2550281/floating-point-vs-integer-calculations-on-modern-hardware

even within the same family such as x86 because different processors have different pipeline lengths. Also some operations are generally..

C++ Timer function to provide time in nano seconds

http://stackoverflow.com/questions/275004/c-timer-function-to-provide-time-in-nano-seconds

QueryPerformanceFrequency typically adjust for multiple processors bugs in the BIOS or drivers may result in these routines returning.. resolution clocks and timers for.html Synchronizing across processors is still an issue. Other fine reading related to timers https..

Performance of built-in types : char vs short vs int vs. float vs. double

http://stackoverflow.com/questions/5069489/performance-of-built-in-types-char-vs-short-vs-int-vs-float-vs-double

other inefficiencies in your code . On somewhat limited processors like those in high end cell phones floating point may be somewhat.. more and more general computing workloads. On very limited processors cheap cell phones and your toaster there is generally no floating.. complexity operations will generally be slow on nearly all processors there just isn't enough benefit to justify the cost. low demand..

Are C++ Reads and Writes of an int atomic

http://stackoverflow.com/questions/54188/are-c-reads-and-writes-of-an-int-atomic

of issues to deal with including cache coherency between processors cores. Use atomic operations like Interlocked on Windows and..

Operator Precedence vs Order of Evaluation

http://stackoverflow.com/questions/5473107/operator-precedence-vs-order-of-evaluation

For a couple of examples the Intel Itanium and VLIW processors such as some DSPs allow a compiler to designate a number of..

Is there any reason to use C instead of C++ for embedded development?

http://stackoverflow.com/questions/812717/is-there-any-reason-to-use-c-instead-of-c-for-embedded-development

Two reasons for using C over C For a lot of embedded processors either there is no C compiler or you have to pay extra for it... is something to bear in mind but as new more capacious processors appear on the market it's less of an issue than it used to be..

how to achieve 4 FLOPs per cycle

http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle

has trouble compiling it well. These are for pre FMA processors. In order to achieve peak FLOPS on Intel Haswell and AMD Bulldozer.. to achieve peak FLOPS on Intel Haswell and AMD Bulldozer processors and later FMA Fused Multiply Add instructions will be needed...

Why is one loop so much slower than two loops?

http://stackoverflow.com/questions/8547778/why-is-one-loop-so-much-slower-than-two-loops

each loop will fall on the same cache way. However Intel processors have had 8 way L1 cache associativity for a while. But in reality..

Why does changing 0.1f to 0 slow down performance by 10x?

http://stackoverflow.com/questions/9314534/why-does-changing-0-1f-to-0-slow-down-performance-by-10x

than on normalized floating point. This is because many processors can't handle them directly and must trap and resolve them using.. Denormalized numbers are generally rare and thus most processors don't try to handle them efficiently. To demonstrate that this..