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What is more efficient? Using pow to square or just multiply it with itself?
...ompiled using gcc 4.4.1 with -o2 optimization.
So in C, yes x*x*x will be faster than pow(x, 3), because there is no pow(double, int) overload. In C++, it will be the roughly same. (Assuming the methodology in my testing is correct.)
This is in response to the comment made by An Markm:
Even if ...
Is it better to use std::memcpy() or std::copy() in terms to performance?
... type in the user's implementation that has correct overflow behavior), so fast memory access on the largest types I can is central to the performance of my algorithm. These are my results:
Time (in seconds) to complete run of SHA-2 tests
std::copy memcpy % increase
6.11 6.29 2.86%
6....
What is the performance cost of having a virtual method in a C++ class?
...r-switched approach is about (1.28 - 0.23) / (0.344 - 0.23) = 9.2 times as fast. Of course, that's specific to the exact system tested / compiler flags & version etc., but generally indicative.
COMMENTS RE VIRTUAL DISPATCH
It must be said though that virtual function call overheads are some...
How much is the overhead of smart pointers compared to normal pointers in C++?
..... and how the compiler/processor deals with speculation ultimately is how fast it is. Less code machine code doesn't necessarily mean faster code. The only way to determine the performance is to profile it. This can change on a processor basis and also per compiler.
– Byron
...
What is the difference between partitioning and bucketing a table in Hive ?
...es that restrict the results to a particular country or department . For a faster query response Hive table can be PARTITIONED BY (country STRING, DEPT STRING). Partitioning tables changes how Hive structures the data storage and Hive will now create subdirectories reflecting the partitioning struc...
In which order should floats be added to get the most precise result?
...ll you can explicitly control this on all compilers that count (e.g. via -ffast-math on GCC).
– Konrad Rudolph
Jul 15 '11 at 8:58
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Why aren't variable-length arrays part of the C++ standard?
...onsole) has precious little cpu stack anyway because it resides in scarce, fast memory.
I'm not saying that pushing variable-sized buffers onto the cpu stack is never needed. Honestly I was surprised back when I discovered this wasn't standard, as it certainly seems like the concept fits into the ...
Proper practice for subclassing UIView?
...
Fast-forward to 2016, you probably shouldn't set frames at all and use autolayout (constraints). If the view is coming from XIB (or storyboard), the subview should already be setup.
– proxi
...
Graph Algorithm To Find All Connections Between Two Arbitrary Vertices
...nd all non-cyclical paths between two nodes. This algorithm should be very fast and scale to large graphs (The graph data structure is sparse so it only uses as much memory as it needs to).
I noticed that the graph you specified above has only one edge that is directional (B,E). Was this a typo or ...
Is it better to specify source files with GLOB or each file individually in CMake?
...up a CMakeLists.txt files for existing projects that don't use CMake.Its a fast way to get all the source referenced (once the build system's running - replace globbing with explicit file-lists).
When CMake isn't used as the primary build-system, if for example you're using a project who aren't usin...