获取与上证所__m128i向量最大值？ [英] Getting max value in a __m128i vector with SSE?

问题描述

我一直在使用SSE刚开始，我很困惑如何获得的最大的整数值（最大） __ m128i 。例如：

I have just started using SSE and I am confused how to get the maximum integer value (max) of a __m128i. For instance:

__m128i t = _mm_setr_ps(0,1,2,3);
// max(t) = 3;

搜索周围使我 MAXPS 指令，但我似乎无法找到如何使用与xmmintrin.h。

Searching around led me to MAXPS instruction but I can't seem to find how to use that with "xmmintrin.h".

此外，有没有任何文档xmmintrin.h，你会建议，而不是寻找到头文件本身？

Also, is there any documentation for "xmmintrin.h" that you would recommend, rather than looking into the header file itself?

推荐答案

如果你发现自己需要做载体水平的操作，尤其是如果它是一个内循环中，那么它的一般的一个标志，你接近以错误的方式你的SIMD执行。 SIMD喜欢操作的向量逐元素 - 垂直如果你喜欢，不是水平

If you find yourself needing to do horizontal operations on vectors, especially if it's inside an inner loop, then it's usually a sign that you are approaching your SIMD implementation in the wrong way. SIMD likes to operate element-wise on vectors - "vertically" if you like, not horizontally.

至于文档，有一个上intel.com 很有借鉴哪些包含所有运算codeS和一切从MMX通过深圳证券交易所的各种口味一路攀升到内在AVX和AVX-512。

As for documentation, there is a very useful reference on intel.com which contains all the opcodes and intrinsics for everything from MMX through the various flavours of SSE all the way up to AVX and AVX-512.

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