sse

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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
SSE normalization slower than simple approximation?

I am trying to normalize a 4d vector. My first approch was to use SSE intrinsics - something that provided a 2 times speed boost to my vector arithmetic.[详细]

2023-02-08 11:54 分类：问答
Variable running time of a C program

My (simd) implementation takes varied amount of time, though it is run for fixed input. The running time varies between say 100 million clock cycles to 120 million clock cycles. The program calls a fu[详细]

2023-02-07 07:11 分类：问答
Using SSE to speed up lower_bound function

In a project I\'m currently working on I often need to find the lo开发者_JS百科west possible index in a sorted array at which an element can be inserted (like std::lower_bound in C++).[详细]

2023-02-06 09:09 分类：问答
approximating log10[x^k0 + k1]

Greetings. I\'m trying to approximate the function Log10[x^k0 + k1], where .21 < k0 < 21, 0 < k1 < ~2000, and x is integer < 2^14.[详细]

2023-02-04 18:27 分类：问答
SSE (SIMD extensions) support in gcc

I see a code as below: #include \"stdio.h\" #define VECTOR_SIZE4 typedef float v4sf __attribute__ ((vector_size(sizeof(float)*VECTOR_SIZE)));[详细]

2023-02-03 00:53 分类：问答
128bit hash comparison with SSE

In my current project, I have to compare 128bit values (actually md5 hashes) and I thought it would be possible to accelerate the comparison by using SSE instructions. My problem is that I can\'t man[详细]

2023-02-01 19:33 分类：问答
Equivalent C code for _mm_ type functions

What is the simple equivalent C code to overc开发者_如何学JAVAome __ functions like _mm_store_ps, _mm_add_ps, etc. Please specify anyone function through an example with the equivalent C code.[详细]

2023-02-01 07:55 分类：问答
indexing into an array with SSE

Suppose I have an array: uint8_t arr[256]; and an element __m128i x containing 16 bytes, x_1, x_2, ... x_16[详细]

2023-01-31 03:28 分类：问答
How to make the following code faster

int u1, u2; unsigned long elm1[20], _mulpre[16][20], res1[40], res2[40]; 64 bits long res1, res2 initialized to zero.[详细]

2023-01-30 12:25 分类：问答