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c++ Programming Glossary: sumshttp://stackoverflow.com/questions/10587598/simd-prefix-sum-on-intel-cpu the second pass. In the first pass you calculate partial sums in parallel and store the total sum for each partial sum. In..
SSE instructions to add all elements of an array http://stackoverflow.com/questions/10930595/sse-instructions-to-add-all-elements-of-an-array elements. Note that you can maintain multiple partial sums until after the loop and then just do one final sum of these.. the loop and then just do one final sum of these partial sums. For example uint32_t sum_array const uint8_t a int n const.. _mm_set1_epi32 0 initialise vector of four partial 32 bit sums uint32_t sum int i for i 0 i n i 16 __m128i v _mm_load_si128..
http://stackoverflow.com/questions/13216041/number-of-tuples O n log n . int b sort a int c int length b ^2 Compute the sums of all of the numbers O n^2 for int i 0 i length b i for int.. d sort c For each number in your list grab the list of of sums so that L num sum H O n Use binary search to find the lower..
What is “cache-friendly” code? http://stackoverflow.com/questions/16699247/what-is-cache-friendly-code memory access requires much more cycles than computing the sums . In practice the performance difference can be much larger...
void pointers: difference between C and C++ http://stackoverflow.com/questions/1736833/void-pointers-difference-between-c-and-c type the original pointer is recovered. And this pretty sums all there is about void conversions in C. What does C standard..
When is overloading pass by reference (l-value and r-value) preferred to pass-by-value? http://stackoverflow.com/questions/18303287/when-is-overloading-pass-by-reference-l-value-and-r-value-preferred-to-pass-by 1000 and assigns them a million times. It times each one sums the times and then finds the average time in floating point..
C++ - Arguments for Exceptions over Return Codes http://stackoverflow.com/questions/1849490/c-arguments-for-exceptions-over-return-codes share improve this question I think this article sums it up. Arguments for Using Exceptions Exceptions separate error..
Uses of a C++ Arithmetic Promotion Header http://stackoverflow.com/questions/2426330/uses-of-a-c-arithmetic-promotion-header that it appears in. It's also useful in things like vector sums for properly declaring internal variables within these operators...
How can I compare the performance of log() and fp division in C++? http://stackoverflow.com/questions/2858483/how-can-i-compare-the-performance-of-log-and-fp-division-in-c has the added benefit of converting the multiplications to sums. However at a certain point in my algorithm I need to divide..
http://stackoverflow.com/questions/3150942/c-delete-this faq lite freestore mgmt.html#faq 16.15 I think this quote sums it up nicely As long as you're careful it's OK for an object..
Quick and dirty way to profile your code http://stackoverflow.com/questions/61278/quick-and-dirty-way-to-profile-your-code data from a profiler that I want to verify. Basically it sums up the time you spent in a specific block and at the end of..
How can I reliably get the address of an object? http://stackoverflow.com/questions/6494591/how-can-i-reliably-get-the-address-of-an-object
Why should `new` be used as little as possible? http://stackoverflow.com/questions/6500313/why-should-new-be-used-as-little-as-possible storage as often as possible Basically the last paragraph sums it up. Using automatic storage as often as possible makes your..
What's a good hash function for English words? http://stackoverflow.com/questions/7700400/whats-a-good-hash-function-for-english-words be a good hashing function So far my hashing function sums the ASCII values of the letters then modulo the table size...
Converting data from glReadPixels() to OpenCV::Mat http://stackoverflow.com/questions/9097756/converting-data-from-glreadpixels-to-opencvmat A . For one component images use either GL_LUMINANCE which sums the individual color components or GL_RED GL_GREEN ... to get..
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