OpenCL中的向量分量总和(类似于SSE)

问题描述

例如在OpenCL中是否有一条指令来计算float4的所有组件的总和?

Is there a single instruction to calculate the sum of all components of a float4, e.g., in OpenCL?

float4 v;
float desiredResult = v.x + v.y + v.z + v.w;

推荐答案

float4 v;
float desiredResult = dot(v, (float4)(1.0f, 1.0f, 1.0f, 1.0f));

要做更多的工作，因为在添加每个组件之前先将它们乘以一个，但是有些GPU内置了点积指令.可能会慢一些.这取决于您的硬件.

It's a little more work, because you're multiplying each component by one before adding them, but some GPUs have a dot product instruction built in. So might be faster; might be slower. It depends on your hardware.

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