I need a fast way to get the position of all one bits in a 64-bit integer. For example, given x = 123703, I'd like to fill an array idx[] = {0, 1, 2, 4, 5, 8, 9, 13, 14, 15, 16}. We can assume we k...

Say, I want to clear 4 zmm registers. Will the following code provide the fastest speed? vpxorq zmm0, zmm0, zmm0 vpxorq zmm1, zmm1, zmm1 vpxorq zmm2, zmm2, zmm2 vpxorq zmm3, zmm3, zmm3 On AVX2, if...

I need a AVX512 double pow(double, int n) function (I need it for a binomial distribution calculation which needs to be exact). In particular I would like this for Knights Landing which has AVX512E...

I recently started working with a Xeon Phi Knights Landing (KNL) 7250 computer (http://ark.intel.com/products/94035/Intel-Xeon-Phi-Processor-7250-16GB-1_40-GHz-68-core). This has 68 cores and AVX ...

Intel compiler generates the following prefetch instruction within a loop for accessing an array by a_ptr pointer: 400e93: 62 d1 78 08 18 4c 24 vprefetch0 [r12+0x80] If I manually change (by hex...

The Intel Xeon Phi "Knights Landing" processor will be the first to support AVX-512, but it will only support "F" (like SSE without SSE2, or AVX without AVX2), so floating-point stuff mainly. I'm...

Background We have been trying unsuccessfully to use the new GCC 5.1 release to offload OpenMP blocks to the Intel MIC (i.e. the Xeon Phi). Following the GCC Offloading page, we've put together the...

I'm thinking of purchasing a Xeon Phi Knights Corner (KNC) coprocessor card. But I don't own an Intel Compiler and I have no interest in purchasing one (and the non-commercial version no longer see...

Is it possible to use Xeon Phi using JVM-based language such as Scala? Is there any example?

I am going to offload some computation to Xeon Phi but would like to test different APIs and different apporached to the parallel programming first. Is there a simulator / emulator for Xeon Phi (e...

I was told one can run a program on MIC that was built with gcc. Is that true? If yes, how to proceed? I'm using gcc version 4.4.7.

Suppose I have a single c/c++ app running on the host. there are few threads running on the host CPU and 50 threads running on the Xeon Phi cores. How can I make sure that each of these 50 runs on...

I am a C# programmer with some C++ experience, all on Windows. With this skill set, are there any options to develop for Intel Xeon Phi processor? Found this link, but not sure if that's ...

To my surprise, I cannot find a comparison of these products using open source OpenCL benchmark suites, such as rodinia and SHOC. Such a comparison could be more interesting than comparisons of the...

I'm implementing an ultra fast popcount on Intel Xeon® Phi®, as it's a performance hotspot of various bioinformatics software. I've implemented five pieces of code, #if defined(__MIC__) #include ...