simd_开发者

OpenCL distribution

I\'m currently developing an OpenCL-application for a very heterogeneous set of computers (using JavaCL to be specific). In order to maximize performance I want to use a GPU if it\'s available otherwi[详细]

2023-04-12 22:03 分类：问答

Why do SSE integer averaging instructions (PAVGB/PAVGW) add 1 to temporary sum before calculating final result?

I have been working on SSE optimization for a video processing algorithm recently. I need to write the exactly same algorithm in C code to cross-check correctness of the algorithm. I forgot about this[详细]

2023-04-12 02:52 分类：问答

Why isn't this loop vectorized?

One particular hot spot when I profile a code I am working on, is the following loop: for(int loc = start; loc<end; ++loc)[详细]

2023-04-06 19:06 分类：问答

SSE micro-optimization instruction order

I have noticed that sometimes MSVC 2010 doesn\'t reorder SSE instructions at all. I thought I didn\'t have to care about instruction order inside my loop since the compiler handles that best, which do[详细]

2023-04-01 22:08 分类：问答

NEON vs Intel SSE - equivalence of certain operations

I\'m having some trouble figuring out the NEON equivalence of a couple of Intel SSE operations. It seems that NEON is not capable to handle an entire Q register at once(128 bit value data type). I hav[详细]

2023-03-31 12:36 分类：问答

What's the best way to load 2 unaligned 64-bit values into an sse register with SSSE3?

There are 2 pointers to 2 unaligned 8 byte chunks to be loaded into an xmm register. If possible, using intrinsics. And if possible, without using an auxiliary register. Without pins开发者_开发问答rd.[详细]

2023-03-31 10:41 分类：问答

Compilation error when perfoming SSE in C++

My code is very simple for understanding SSE. My code is: #include <iostream> #include <iomanip&开发者_高级运维gt;[详细]

2023-03-31 10:27 分类：问答

How can I exchange the low 128 bits and high 128 bits in a 256 bit AVX (YMM) register

I am porting SSE SIMD code to use the 256 bit AVX extensions and cannot seem to find any instruction that will blend/shuffle/move the high 128 bits and the low 128 bits.[详细]

2023-03-30 21:40 分类：问答

Aliasing of NEON vector data types

Does NEON support aliasing of the vector data types with their scalar components? E.g.(开发者_如何转开发Intel SSE)[详细]

2023-03-30 19:32 分类：问答

What is the 4-way SIMD version of float selection on OSX Accelerate framework?

Using the Accelerate framework from OSX, you get access to 4-way SIMD functionality where you can operate on vector floats, vector ints and vector bools. It gives you 4-way divisions e.g. and also 4-w[详细]

2023-03-30 07:10 分类：问答