simd

Here is an example of a class which shows supported instruction sets. https://msdn.microsoft.com/en-us/library/hskdteyh.aspx I want to write three different implementations of a single function, each of them using different instruction set. But due to flag /ARCH:AVX2, for example, this app won't ever run anywhere but on 4th+ generation of Intel processors, so the whole point of checking is pointless. So, question is: what exactly this flag does? Enables support or enables compiler optimizations using provided instruction sets ? In other words, can I completely remove this flag and keep using

For a tutorial I'm writing, I'm looking for a "realistic" and simple example of a deadlock caused by ignorance of SIMT / SIMD. I came up with this snippet, which seems to be a good example. Any input would be appreciated. … int x = threadID / 2; if (threadID > x) { value[threadID] = 42; barrier(); } else { value2[threadID/2] = 13 barrier(); } result = value[threadID/2] + value2[threadID/2]; I know, it is neither proper CUDA C nor OpenCL C. A simple deadlock that is actually easy to catch by the novice CUDA programmer is when one tries to implement a critical section for a single thread, that

I am new to SSE programming so I am hoping someone out there can help me. I recently implemented a function using GCC SSE intrinsics to compute the sum of an array of 32-bit integers. The code for my implementation is given below. int ssum(const int *d, unsigned int len) { static const unsigned int BLOCKSIZE=4; unsigned int i,remainder; int output; __m128i xmm0, accumulator; __m128i* src; remainder = len%BLOCKSIZE; src = (__m128i*)d; accumulator = _mm_loadu_si128(src); output = 0; for(i=BLOCKSIZE;i<len-remainder;i+=BLOCKSIZE){ xmm0 = _mm_loadu_si128(++src); accumulator = _mm_add_epi32

Is it possible to get GHC to produce SIMD code for the various SSE generations? Eg. got a program like this import Data.Array.Vector main = print . sumU $ (enumFromToFracU 1 10000000 :: UArr Double) I can see the generated code (compiled for 64 bit x86) use SSE instructions in scalar mode (both C and asm backends). So addsd rather than addpd. For the types of programs I work on the use of vector instructions is important for performance. Is there an easy way for a newbie such as myself to get GHC to SIMDize the code using SSE? Yes, it is possible, via the C backend, but it is trial and error.

I am using a CFD code (for computational fluid dynamic). I recently had the chance to see Intel Compiler using SSE in one of my loops, adding a nearly 2x factor to computation performances in this loop. However, the use of SSE and SIMD instructions seems more like luck. Most of the time, the compiler do nothing. I am then trying to force the use of SSE, considering that AVX instructions will reinforce this aspect in the near future. I made a simple 1D heat transfer code. It consist of two phases, using the results of the other (U0 -> U1, then U1 -> U0, then U0 -> U1, etc). When it iterates, it