sse

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Do the higher level SSE flags imply the lower ones in GCC / clang?

For example, if you use -msse4, does this imply that it will also use -mssse3, -msse3, -msse2 and so on or do you have to explicitly add those flag开发者_开发问答s as well?You only need the highest le[详细]

2023-01-30 07:14 分类：问答
SSE: convert __m128 and __m128i into two __m128d

Two related questions. This is what my code needs to do with fairly large amount of data. It is done inside inner loops and the performance is important.[详细]

2023-01-30 02:58 分类：问答
SIMD code vs Scalar Code

The following loop is executed hundreds of times. elma and elmc are both unsigned long (64-bit) arrays, so is res1 and res2.[详细]

2023-01-29 10:06 分类：问答
64-bit specific simd intrinsic

I am using the following union declaration in SSE2. typedef unsigned long uli; typedef uli v4si __attribute__ ((vector_size(16)));[详细]

2023-01-29 06:46 分类：问答
What's the most efficient way to load and extract 32 bit integer values from a 128 bit SSE vector?

I\'m trying to optimize my cod开发者_如何学Goe using SSE intrinsics but am running into a problem where I don\'t know of a good way to extract the integer values from a vector after I\'ve done the SSE[详细]

2023-01-28 19:25 分类：问答
SSE shifting integers

I\'m trying to understand how shifting with SSE works, but I don\'t understand the output gdb gives me. Using SSE4 I have a 128bit vector holding 8 16bit unsigned integers (using uint16_t). Then I use[详细]

2023-01-25 05:11 分类：问答
Most efficient way to store 4 dot products into a contiguous array in C using SSE intrinsics

I am optimizing some code for an Intel x86 Nehalem micro-architecture using SSE intrinsics. A portion of my program computes 4 dot products and adds each result to the previous 开发者_C百科values in[详细]

2023-01-24 17:04 分类：问答
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
What is my compiler doing? (optimizing memcpy)

I\'m compiling a bit of code using the following settings in VC++2010:/O2 /Ob2 /Oi /Ot However I\'m having some trouble understanding some parts of the assembly generated, I have put some questions i[详细]

2023-01-22 10:46 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