| title | __m128i | Microsoft Docs | |
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| ms.date | 11/04/2016 | |
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| ms.topic | language-reference | |
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| ms.assetid | bd245d68-862c-46dd-9903-6c67c7c5dbcd | |
| author | mikeblome | |
| ms.author | mblome | |
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The __m128i data type, for use with the Streaming SIMD Extensions 2 (SSE2) instructions intrinsics, is defined in <emmintrin.h>.
// data_types__m128i.cpp
#include <emmintrin.h>
int main() {
__m128i x;
} You should not access the __m128i fields directly. You can, however, see these types in the debugger. A variable of type __m128i maps to the XMM[0-7] registers.
Variables of type _m128i are automatically aligned on 16-byte boundaries.
Note
Using variables of type __m128i will cause the compiler to generate the SSE2 movdqa instruction. This instruction does not cause a fault on Pentium III processors but will result in silent failure, with possible side effects caused by whatever instructions movdqa translates into on Pentium III processors.
The __m128i data type is not supported on ARM processors.
END Microsoft Specific