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我在哪里可以找到 crc32intrin.h？

[英]Where can I find crc32intrin.h?

原文 2023-01-11 18:07:47 7 2 zlib/ intrinsics/ crc32

Where can I find the header file crc32intrin.h ?我在哪里可以找到 header 文件crc32intrin.h ？

It is related to zlib.它与 zlib 有关。

I am converting C++ code to Java, and this name is repeatedly coming up, but I can't find it.我正在把C++码转成Java，这个名字反复出现，就是找不到。

2 个解决方案

The Clang compiler ships it. Clang 编译器提供了它。 GCC does not. GCC 没有。 Here is its documentation and a link to the source code: https://clang.llvm.org/doxygen/crc32intrin_8h.html这是它的文档和源代码链接： https://clang.llvm.org/doxygen/crc32intrin_8h.html

Normally you should just include <immintrin.h> .通常你应该只包含<immintrin.h> 。

Intel's intrinsics guide documents _mm_crc32_u64 , _u32, etc. as being in <nmmintrin.h> (new in Nehalem?) - https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#techs=SSE_ALL,Other&ig_expand=6243,519,1563&text=crc32英特尔的内在函数指南文档_mm_crc32_u64 、_u32 等在<nmmintrin.h>中（Nehalem 中的新功能？）- https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index .html#techs=SSE_ALL,Other&ig_expand=6243,519,1563&text=crc32

GCC does provide these intrinsics (in smmintrin.h as it turns out), but crc32intrin.h is a clang implementation detail. GCC 确实提供了这些内在函数（事实证明在smmintrin.h中），但crc32intrin.h是 clang 的实现细节。

These days usually best to include immintrin.h to pull in all known intrinsics.现在通常最好包含immintrin.h以引入所有已知的内在函数。 (Unfortunately getting a bit bulky with AVX-512 having boatloads, so not great for compile times.) GCC and clang will stop you from using intrinsics you didn't enable with options like -march=x86-64-v3 (similar to haswell but without tune=) or x86-64-v2 (similar to nehalem ). （不幸的是，AVX-512 有点笨重，所以编译时间不是很好。）GCC 和 clang 将阻止你使用你没有启用的内在函数，比如-march=x86-64-v3 （类似于haswell但没有 tune=) 或x86-64-v2 （类似于nehalem ）。