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title ms.custom ms.date ms.technology ms.topic f1_keywords dev_langs helpviewer_keywords ms.assetid author ms.author ms.workload
__m128 | Microsoft Docs
11/04/2016
cpp-language
language-reference
__m128_cpp
C++
__m128 keyword [C++]
e51a472a-0e3c-4989-9a2a-36adb05273a3
mikeblome
mblome
cplusplus

__m128

Microsoft Specific

The __m128 data type, for use with the Streaming SIMD Extensions and Streaming SIMD Extensions 2 instructions intrinsics, is defined in <xmmintrin.h>.

// data_types__m128.cpp  
#include <xmmintrin.h>  
int main() {  
   __m128 x;  
}  

Remarks

You should not access the __m128 fields directly. You can, however, see these types in the debugger. A variable of type __m128 maps to the XMM[0-7] registers.

Variables of type __m128 are automatically aligned on 16-byte boundaries.

The __m128 data type is not supported on ARM processors.

END Microsoft Specific

See also

Keywords
Fundamental Types
Data Type Ranges