simd

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Profiling SIMD Code

UPDATED - Check Below Will keep this as short as possible. Happy to add any more details if required. I have some sse code for normalising a vector. I\'m using QueryPerformanceCounter() (wrapped in[详细]

2023-03-01 13:01 分类：问答
Why ARM NEON not faster than plain C++?

Here is a C++ code: #define ARR_SIZE_TEST ( 8 * 1024 * 1024 ) void cpp_tst_add( unsigned* x, unsigned* y )[详细]

2023-02-27 01:55 分类：问答
Intel SSE: Why does `_mm_extract_ps` return `int` instead of `float`?

Why does _mm_extract_ps return an int instead of a float? What\'s the proper way to read a single float from an XMM register in C?开发者_StackOverflow[详细]

2023-02-22 04:25 分类：问答
Unhandled exception in using intrinsic

I have an application created using VC++, and wanted to explore optimization opprtunity开发者_运维技巧 by vectorizing some operations.[详细]

2023-02-20 16:17 分类：问答
ceil/floor in sse simd

Can anyone suggest a fast way to compute float floor/ceil using pre-SSE4.1 SIMD? I need to correctly handle all the corner cases, e.g. when I have a float value, that is not representable by 32-bit in[详细]

2023-02-16 16:33 分类：问答
Multiplying vector by constant using SSE

I have some code that operates on 4D vectors and I\'m currently trying to convert it to use SSE. I\'m using both clang and gcc on 64b linux.[详细]

2023-02-16 11:29 分类：问答
Help me improve some more SSE2 code

I am looking for some help to improve this bilinear scaling sse2 code on core2 cpus On my Atom N270 and on an i7 this code is about 2x faster than the mmx code.But under core2 cpus it is only equal t[详细]

2023-02-13 07:58 分类：问答
Speeding up some SSE2 Intrinsics for color conversion

I\'m trying to perform image colour conversion from YCbCr to BGRA (Don\'t ask about the A bit, such a headache).[详细]

2023-02-11 06:27 分类：问答
gcc, simd intrinsics and fast-math concepts

Hi all :) I\'m trying to get a hang on a few concepts regarding floating point, SIMD/math intrinsics and the fast-math flag for gcc. More specifically, I\'m using MinGW with gcc v4.5.0 on a x86 cpu.[详细]

2023-02-10 02:10 分类：问答
Mixing TBB with SSE2 intrinsics

Is using SSE2 intrinsic in the parallel_for a good idea ? Since the number of SSE2 registers is limited, will it give rise to penalty in terms of performance ?[详细]

2023-02-08 15:48 分类：问答