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Answer by bokan for Why is my program slow when looping over exactly 8192...

The following tests have been done with Visual C++ compiler as it is used by the default Qt Creator install (I guess with no optimization flag). When using GCC, there is no big difference between...

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Answer by Mysticial for Why is my program slow when looping over exactly 8192...

The difference is caused by the same super-alignment issue from the following related questions: Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513? Matrix...

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Why is my program slow when looping over exactly 8192 elements?

Here is the extract from the program in question. The matrix img[][] has the size SIZE×SIZE, and is initialized at: img[j][i] = 2 * j + i Then, you make a matrix res[][], and each field in here is...

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