### mmcalls

Instructs the compiler to optimize arithmetic and function calling code for use of MMX registers (AMD K6 + 3DNow! instruction set) or SSE registers (Intel SSE or SSE-2 instruction sets) when the related pragmas or options are enabled.

##### Syntax

#pragma mmcalls on | off | reset

##### Targets

Intel x86

##### Remarks

This pragma corresponds to the Use multimedia calling convention setting in the the x86 CodeGen panel.

NOTE This pragma generates code that is not compatible with the Intel Pentium class of microprocessors.

To check this setting, use __option (mmcalls).