Top "Simd" questions

SIMD prefix sum on Intel cpu

I need to implement a prefix sum algorithm and would need it to be as fast as possible. Ex: [3, 1, 7, 0, 4, 1, 6, 3] should …

c++ sse simd prefix-sum

Fastest Implementation of the Natural Exponential Function Using SSE

I'm looking for an approximation of the natural exponential function operating on SSE element. Namely - __m128 exp( __m128 x ). …

c optimization vectorization sse simd

SSE: Difference between _mm_load/store vs. using direct pointer access

Suppose I want to add two buffers and store the result. Both buffers are already allocated 16byte aligned. I found …

x86 sse simd

SIMD the following code

How do I SIMIDize the following code in C (using SIMD intrinsics of course)? I am having trouble understanding SIMD …

c x86 sse simd

Java can recognize SIMD advantages of CPU; or there is just optimization effect of loop unrolling

This part of code is from dotproduct method of a vector class of mine. The method does inner product computing …

java performance optimization simd loop-unrolling

Fastest way to compute absolute value using SSE

I am aware of 3 methods, but as far as I know, only the first 2 are generally used: Mask off the …

x86 vectorization sse simd absolute-value

How to check if compiled code uses SSE and AVX instructions?

I wrote some code to do a bunch of math, and it needs to go fast, so I need it …

c++ assembly x86 g++ simd

Why does does SSE set (_mm_set_ps) reverse the order of arguments

I recently noticed that _m128 m = _mm_set_ps(0,1,2,3); puts the 4 floats into reverse order when cast to a float …

c++ c sse simd