| title | __m64 | Microsoft Docs | |
|---|---|---|
| ms.custom | ||
| ms.date | 11/04/2016 | |
| ms.reviewer | ||
| ms.suite | ||
| ms.technology |
|
|
| ms.tgt_pltfrm | ||
| ms.topic | language-reference | |
| f1_keywords |
|
|
| dev_langs |
|
|
| helpviewer_keywords |
|
|
| ms.assetid | df0410e8-67c9-4954-88c8-fe2653575252 | |
| caps.latest.revision | 9 | |
| author | mikeblome | |
| ms.author | mblome | |
| manager | ghogen |
The __m64 data type is for use with the MMX and 3DNow! intrinsics, and is defined in xmmintrin.h.
// data_types__m64.cpp
#include <xmmintrin.h>
int main()
{
__m64 x;
}
You should not access the __m64 fields directly. You can, however, see these types in the debugger. A variable of type __m64 maps to the MM[0-7] registers.
Variables of type _m64 are automatically aligned on 8-byte boundaries.
The __m64 data type is not supported on [!INCLUDEvcprx64] processors. Applications that use __m64 as part of MMX intrinsics must be rewritten to use equivalent SSE and SSE2 intrinsics.
END Microsoft Specific