SSE intrinsics compiling MSDN code with GCC error?

问题:

I'm wondering if Microsofts SSE intrinsics are a little different than the norm because I tried compiling this code with GCC with flags -msse -msse2 -msse3 -msse4

#include <stdio.h>
#include <smmintrin.h>

int main ()
{
    __m128i a, b;

    a.m128i_u64[0] = 0x000000000000000;
    b.m128i_u64[0] = 0xFFFFFFFFFFFFFFF;

    a.m128i_u64[1] = 0x000000000000000;
    b.m128i_u64[1] = 0x000000000000000;

    int res1 = _mm_testnzc_si128(a, b);

    a.m128i_u64[0] = 0x000000000000001;

    int res2 = _mm_testnzc_si128(a, b);

    printf_s("First result should be 0: %d\nSecond result should be 1: %d\n",
                res1, res2);

    return 0;
}

and it gave me the following errors:

sse_test_not_zero.c||In function 'main':|
sse_test_not_zero.c|8|error: request for member 'm128i_u64' in something not a structure or union|
sse_test_not_zero.c|9|error: request for member 'm128i_u64' in something not a structure or union|
sse_test_not_zero.c|9|warning: integer constant is too large for 'long' type|
sse_test_not_zero.c|11|error: request for member 'm128i_u64' in something not a structure or union|
sse_test_not_zero.c|12|error: request for member 'm128i_u64' in something not a structure or union|
sse_test_not_zero.c|16|error: request for member 'm128i_u64' in something not a structure or union|
sse_test_not_zero.c|20|warning: implicit declaration of function 'printf_s'|

It seems to me that I need to create struct for __m128i although there might be a better solution to this problem if someone else knows of one.

回答1:

The definition of SSE types such as __m128i is different in Microsoft-land than in the rest of the world. If you want to write portable SSE code then stick with the intrinsics that are common to all platforms and don't make any assumptions about how the SSE vector types are defined (i.e. treat them as more-or-less opaque data types). You can implement the code in your question just using appropriate _mm_set_xxx intrinsics.