MMWORD

 

The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.

The latest version of this topic can be found at MMWORD.

Used for 64-bit multimedia operands with MMX and SSE (XMM) instructions.

MMWORD  

MMWORD is a type. Prior to MMWORD being added to MASM, equivalent functionality could have been achieved with:

mov mm0, qword ptr [ebx]  

While both instructions work on 64-bit operands, QWORD is the type for 64-bit unsigned integers and MMWORD is the type for a 64-bit multimedia value.

MMWORD is intended to represent the same type as __m64.

movq     mm0, mmword ptr [ebx]  

Show: