_blsr_u64的标题与Sun在Solaris 11上提供了GCC？ [英] Header for _blsr_u64 with Sun supplied GCC on Solaris 11?

问题描述

我们有一些在多个平台上运行的代码。该代码使用 BMI / BMI2 内在函数，如Core i7 5th gen。由Sun在Solaris 11.3上提供的GCC正在定义 __ BMI __ 和 __ BMI2 __ ，但它在定位BMI / BMI2内部函数时遇到了问题：

  $ cat test.cxx 
 #include< x86intrin.h> 
 int main（int argc，char * argv []）
 {
 unsigned long long t = argc; 
 #if defined（__ BMI__）||定义（__ BMI2__）
 t = _blsr_u64（t）; 
 #endif 
 return int（t）; 
 
 $ b $ / bin / g ++ -march = native test.cxx -o test.exe 
 test.cxx：在函数中int main（int，char **） '：
 test.cxx：6：18：错误：'_blsr_u64'未在此范围内声明
t = _blsr_u64（t）; 
 ^ 
  

包括 immintrin.h 没有区别。

其中头文件当在Solaris 11.3上使用GCC时，我们是否包含 _blsr_u64 ？

---

<

  $ / bin / g ++ -march = native -dM -E  - < / dev / null |排序| \ 
 / usr / gnu / bin / egrep -i'（sse | aes | rdrnd | rdseed | avx | bmi）'
 #define __AES__ 1 
 #define __AVX__ 1 
 #define __AVX2__ 1 
 #define __BMI__ 1 
 #define __BMI2__ 1 
 #define __core_avx2 1 
 #define __core_avx2__ 1 
 #define __RDRND__ 1 
＃ define __RDSEED__ 1 
 #define __SSE__ 1 
 #define __SSE2__ 1 
 #define __SSE3__ 1 
 #define __SSE4_1__ 1 
 #define __SSE4_2__ 1 
 #define __SSSE3__ 1 
 #define __tune_core_avx2__ 1 
  

和CPU功能：

  $ isainfo -v 
 64位amd64应用程序
 avx xsave pclmulqdq aes movbe sse4.2 sse4.1 ssse3 amd_lzcnt popcnt tscp 
 ahf cx16 sse3 sse2 sse fxsr mmx cmov amd_sysc cx8 tsc fpu prfchw adx 
 rdseed efs rtm hle bmi2 avx2 bmi1 f16c fma rdrand 
  

和GCC版本：

  $ / bin / g ++ --version 
 g ++ （GCC）4.8.2 
版权所有（C）2013 Free Software Foundat ion，Inc. 
  

解决方案

在Solaris 11.3上使用GCC时，我们将_blsr_u64包含哪个头？

它看起来像 #include< x86intrin.h> 是正确的。

问题是编译器调用需要 -march = native -m64 ，即使64位是本机的，而内核是64位的：

  $ / bin / g ++ -march = native -m64 test.cxx -o test.exe 
  

We've got some code that runs on multiple platforms. The code uses BMI/BMI2 intrinsics when available, like a Core i7 5th gen. GCC supplied by Sun on Solaris 11.3 is defining __BMI__ and __BMI2__, but its having trouble locating BMI/BMI2 intrinsics:

$ cat test.cxx
#include <x86intrin.h>
int main(int argc, char* argv[])
{
  unsigned long long t = argc;
#if defined(__BMI__) || defined(__BMI2__)
  t = _blsr_u64(t);
#endif
  return int(t);
}

$ /bin/g++ -march=native test.cxx -o test.exe
test.cxx: In function ‘int main(int, char**)’:
test.cxx:6:18: error: ‘_blsr_u64’ was not declared in this scope
   t = _blsr_u64(t);
                  ^

Including immintrin.h does not make a difference.

Which header do we include for _blsr_u64 when using GCC on Solaris 11.3?

---

Here are the relevant defines from GCC:

$ /bin/g++ -march=native -dM -E - < /dev/null | sort | \
  /usr/gnu/bin/egrep -i '(sse|aes|rdrnd|rdseed|avx|bmi)'
#define __AES__ 1
#define __AVX__ 1
#define __AVX2__ 1
#define __BMI__ 1
#define __BMI2__ 1
#define __core_avx2 1
#define __core_avx2__ 1
#define __RDRND__ 1
#define __RDSEED__ 1
#define __SSE__ 1
#define __SSE2__ 1
#define __SSE3__ 1
#define __SSE4_1__ 1
#define __SSE4_2__ 1
#define __SSSE3__ 1
#define __tune_core_avx2__ 1

And CPU features:

$ isainfo -v
64-bit amd64 applications
        avx xsave pclmulqdq aes movbe sse4.2 sse4.1 ssse3 amd_lzcnt popcnt tscp 
        ahf cx16 sse3 sse2 sse fxsr mmx cmov amd_sysc cx8 tsc fpu prfchw adx 
        rdseed efs rtm hle bmi2 avx2 bmi1 f16c fma rdrand 

And GCC version:

$ /bin/g++ --version
g++ (GCC) 4.8.2
Copyright (C) 2013 Free Software Foundation, Inc.

解决方案

Which header do we include for _blsr_u64 when using GCC on Solaris 11.3?

It looks like #include <x86intrin.h> is correct.

The problem was the compiler invocation required both -march=native -m64 even though 64-bit is native for the machine and the kernel is 64-bit:

$ /bin/g++ -march=native -m64 test.cxx -o test.exe

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