Question

我想知道Microsofts SSE intrinsics是否与标准有点不同，因为我尝试使用带有标记-msse -msse2 -msse3 -msse4的GCC编译此代码

#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;
}

它给了我以下错误：

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'|

在我看来，我需要为struct创建__m128i，但如果其他人知道这个问题，可能会有更好的解决方法。

Answer 1

SSE 类型的定义，例如__m128i在Microsoft-land中与在世界其他地方不同。如果您想编写可移植的SSE代码，那么请坚持使用所有平台通用的内在函数，并且不要对如何定义SSE向量类型做任何假设（即将它们视为或多或少不透明的数据类型）。您可以使用适当的_mm_set_xxx内在函数来实现问题中的代码。

SSE内在函数编译带有GCC错误的MSDN代码？

1 个答案: