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c++ Programming Glossary: branchingWhy 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 sorted. A general rule of thumb is to avoid data dependent branching in critical loops. such as in this example Update GCC 4.6.1..
http://stackoverflow.com/questions/12215395/thread-pool-using-boost-asio by boost bind . Meta programming to perform compile time branching based on whether or not the user's type if the result of boost..
Branchless code that maps zero, negative, and positive to 0, 1, 2 http://stackoverflow.com/questions/1610836/branchless-code-that-maps-zero-negative-and-positive-to-0-1-2 is zero negative or positive. Here's a version with branching int Compare int x int y int diff x y if diff 0 return 0 else..
http://stackoverflow.com/questions/1613230/uses-of-c-comma-operator supports such fundamental constructs as sequencing and branching . These fundamental constructs are present in C C languages.. of statements separated by . When you want to do some branching you use if statements. You can also use cycles and other kinds..
What is the fastest integer division supporting division by zero no matter what the result is? http://stackoverflow.com/questions/16777456/what-is-the-fastest-integer-division-supporting-division-by-zero-no-matter-what so I'm looking for a way to get rid of the conditional branching. When y does not exceed the byte range I'm happy with the solution.. values unchanged Clarifications I'm not 100 sure that branching is too expensive. However different compilers are used so I..
http://stackoverflow.com/questions/17095324/fastest-way-in-c-to-determine-if-an-integer-is-between-two-integers-inclusive r1 bhs LBB44_36 Pretty amazing how reducing or eliminating branching can provide such a dramatic speed up. c c performance math..
Using bools in calculations to avoid branches http://stackoverflow.com/questions/20163883/using-bools-in-calculations-to-avoid-branches they are in 100110 pattern. Performance is similar but branching is a bit faster. Random is when branch is unpredictable. In.. cases my bit hacking trick is fastest except for On where branching wins. Note that this benchmark is not necessarily representative..
USB-drive serial number under linux C++ http://stackoverflow.com/questions/2432759/usb-drive-serial-number-under-linux-c if we want to retrieve only for removable drives use this branching if id config 1 7 id command_set_1 4 close fd printf Serial..
Examples of good gotos in C or C++ http://stackoverflow.com/questions/245742/examples-of-good-gotos-in-c-or-c I'll accept the first answer which gave the C pattern for branching to a cleanup block. IMO this makes the strongest case for a..
Why is inlining considered faster than a function call? http://stackoverflow.com/questions/4016061/why-is-inlining-considered-faster-than-a-function-call b if b something else something else will require actual branching if called as a non inlined function foo true ... foo false However.. the compiler will immediately be able to eliminate the branching. Essentially in the above case inlining allows the compiler..
If statement inside a cuda kernel http://stackoverflow.com/questions/6179295/if-statement-inside-a-cuda-kernel affect my algorithm performance I know that there is no branching since all threads in all blocks will enter either the if or.. the compiler will optimize away the dead code and the branching with it. Perhaps something like this template int action __global__..
Integer subtraction with wrap around for N bits http://stackoverflow.com/questions/8309538/integer-subtraction-with-wrap-around-for-n-bits int v int s int max 1 BITS v s if v max v max 2 or if branching is bad something like v max 2 v max return v For example subtracting..
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 the performance is dominated by overhead like looping and branching. Region 2 Here as the data sizes increases the amount of relative.. two loops is slower because it has twice as much loop and branching overhead. I'm not sure exactly what's going on here... Alignment..
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