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c++ Programming Glossary: iterationsWhy 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 255. When the data is sorted roughly the first half of the iterations will not enter the if statement. After that they will all enter.. will correctly predict the branch except for the few iterations after it switches direction. Quick visualization T branch taken..
Constants and compiler optimization in C++ http://stackoverflow.com/questions/212237/constants-and-compiler-optimization-in-c unrolling if the const object is controlling the number of iterations of a loop Note that this stuff applies only if the actual object..
how to achieve 4 FLOPs per cycle http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle uint64 double test_dp_mac_SSE double x double y uint64 iterations register __m128d r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 rA rB rC rD rE.. iMASK __m128d vONE _mm_set1_pd 1.0 uint64 c 0 while c iterations size_t i 0 while i 1000 Here's the meat the part that really.. temp 1 return out void test_dp_mac_SSE int tds uint64 iterations double sum double malloc tds sizeof double double start omp_get_wtime..
Why does changing 0.1f to 0 slow down performance by 10x? http://stackoverflow.com/questions/9314534/why-does-changing-0-1f-to-0-slow-down-performance-by-10x using microcode. If you print out the numbers after 10 000 iterations you will see that they have converged to different values depending..
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