high performance program (SSE4.2 intrin instruction)

In file included from mm_lddqu.si128.c:2:0:

/usr/local/lib/gcc/x86_64-redhat-linux/4.7.1/include/nmmintrin.h:31:3: error: #error "SSE4.2 instruction set not enabled"

这个问题产生的原因：

没有加 

Support for SSSE3 built-in functions and code generation are available via -mssse3.

Support for SSE4.1 built-in functions and code generation are available via -msse4.1.

Support for SSE4.2 built-in functions and code generation are available via -msse4.2.

Both SSE4.1 and SSE4.2 support can be enabled via -msse4.

  1 #include <stdio.h>
  2 #include <nmmintrin.h>
  3 int main()
  4 {
  5         unsigned char pBuf[32];
  6         __m128i i;
  7         __m128i j;
  8         printf("%d\n",sizeof(__m128i));
  9         return 0;
 10 }

complier:

gcc mm_lddqu.si128.c -msse4.2



 

output:

         16

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