simd

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How to Calculate single-vector Dot Product using SSE intrinsic functions in C

I am trying to 开发者_StackOverflowmultiply two vectors together where each element of one vector is multiplied by the element in the same index at the other vector.I then want to sum all the elements[详细]

2023-01-24 10:34 分类：问答
SIMD optimization puzzle

I Want to optimize the following function using SIMD (SSE2 & such): int64_t fun(int64_t N, int size, int* p)[详细]

2023-01-22 06:12 分类：问答
SIMD version check

I am using Intel Core2Duo E4500 processor. 开发者_运维问答It is supposed to have SSE3, SSSE3 facilities. But if I try to use them in programs it shows the following error \"SSE3 instruction set not en[详细]

2023-01-21 02:44 分类：问答
SIMD code for exponentiation

I am using SIMD to compute fast exponentiation result. I compare the timing with non-simd code. The exponentiation is implemented using square and multiply algorithm.[详细]

2023-01-21 01:10 分类：问答
How to use NEON comparison (greater than or equal to) instruction?

How to use the NEON comparison instructions in general? Here is a case, I want to use, Greater-than-or-equal-to instruction?[详细]

2023-01-17 06:07 分类：问答
Rationale for no primitive SIMD data types

(Sorry if this sounds like a rant, but it\'s a real question and I\'d appreciate real answers) I understand that since C is so old, it might have not made sense to add it back then(MMX didn\'t even e[详细]

2023-01-15 02:52 分类：问答
What is the limit of optimization using SIMD?

I need to optimize some C code, which does lots of physics computations, using SIMD extensions on the SPE of the Cell Processor. Each vector operator can process 4 floats at the same time. So ideally[详细]

2023-01-14 17:52 分类：问答
SSE access violation

I have the code: float *mu_x_ptr; __m128 *tmp; __m128 *mm_mu_x; mu_x_ptr = _aligned_malloc(4*sizeof(float), 16);[详细]

2023-01-10 04:24 分类：问答
SSE2 intrinsics: access memory directly

Many SSE instructions allow th开发者_StackOverflow中文版e source operand to be a 16-byte aligned memory address. For example, the various (un)pack instructions. PUNCKLBW has the following signature:[详细]

2023-01-09 01:46 分类：问答
Is 3x3 Matrix inverse possible using SIMD instructions?

I\'m making use of an ARM Cortex-A8 based processor and I have several places where I calculate 3x3 Matrix inverse operations.[详细]

2023-01-09 01:35 分类：问答