c++ Programming Glossary: optimizations

http://stackoverflow.com/questions/1119134/how-do-malloc-and-free-work

is put back into the free list. There are many different optimizations to this standard behaviour for example for small chunks of memory.. fallback when alternatives are not usable. There are also optimizations in handling the free list for example storing the chunks in.. storing the chunks in lists sorted by sizes. But all optimizations also have their own limitations. Why does your code crash The..

Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?

http://stackoverflow.com/questions/11413855/why-is-transposing-a-matrix-of-512x512-much-slower-than-transposing-a-matrix-of

ms http ideone.com NShpo In my environment MSVS 2010 full optimizations the difference is similar size 512 average 2.19 ms size 513..

What is the difference between NULL, '\0' and 0

http://stackoverflow.com/questions/1296843/what-is-the-difference-between-null-0-and-0

work if mynull never changes in the code and the compiler optimizations constant fold the 0 into the if statement but this is not guaranteed..

Constants and compiler optimization in C++

http://stackoverflow.com/questions/212237/constants-and-compiler-optimization-in-c

when you introduce mutable variables Do they affect these optimizations of const methods c optimization compiler share improve this.. will not be modified therefore it can produce significant optimizations. These optimizations can include things like incorporating the.. therefore it can produce significant optimizations. These optimizations can include things like incorporating the object's value directly..

What uses are there for “placement new”?

http://stackoverflow.com/questions/222557/what-uses-are-there-for-placement-new

that's already allocated. You may want to do this for optimizations it is faster not to re allocate all the time but you need to..

Why does C++ compilation take so long?

http://stackoverflow.com/questions/318398/why-does-c-compilation-take-so-long

in header files. Optimization C allows some very dramatic optimizations. C# or Java don't allow classes to be completely eliminated.. program can rely on the JIT compiler to perform additional optimizations at load time C doesn't get any such second chances . What the..

Which, if any, C++ compilers do tail-recursion optimization?

http://stackoverflow.com/questions/34125/which-if-any-c-compilers-do-tail-recursion-optimization

Both the current version of VC and GCC do tail call optimizations fairly well and even for mutually recursive calls. I bet the..

C++ Functors - and their uses

http://stackoverflow.com/questions/356950/c-functors-and-their-uses

points to so unless it performs some fairly complex global optimizations it'd have to dereference the pointer at runtime and then make..

Does the C++ standard mandate poor performance for iostreams, or am I just dealing with a poor implementation? [closed]

http://stackoverflow.com/questions/4340396/does-the-c-standard-mandate-poor-performance-for-iostreams-or-am-i-just-deali

of time spent in iostream library code full compiler optimizations and switching from iostreams to OS specific I O APIs and custom..

C++ memcpy() vs std::copy()

http://stackoverflow.com/questions/4707012/c-memcpy-vs-stdcopy

My optimization flags are Ofast march native funsafe loop optimizations . Code for my SHA 2 implementations. I decided to run a test..

Why would anybody use C over C++? [closed]

http://stackoverflow.com/questions/497786/why-would-anybody-use-c-over-c

performance but the compilers aren't as good at seeing optimizations a good C programmer will see The software you're writing is..

Flags to enable thorough and verbose g++ warnings

http://stackoverflow.com/questions/5088460/flags-to-enable-thorough-and-verbose-g-warnings

it's overkill for an all or nothing setting. Wunsafe loop optimizations causes too many spurious warnings. It may be useful to apply..

What is more efficient i++ or ++i? [duplicate]

http://stackoverflow.com/questions/561588/what-is-more-efficient-i-or-i

i return the temporary copy i increment i return i With optimizations on it is quite possible that the resulting assembly is identical..

Why does integer overflow on x86 with GCC cause an infinite loop?

http://stackoverflow.com/questions/7682477/why-does-integer-overflow-on-x86-with-gcc-cause-an-infinite-loop

1073741824 2147483648 0 0 0 ... infinite loop With optimizations disabled there is no infinite loop and the output is correct...