### mmx

Controls special code generation Intel MMX extensions.

##### Syntax

#pragma mmx on | off | reset

##### Targets

Intel x86

##### Remarks

This pragma tells the x86 compiler to generate Intel MMX extension code that only runs on processors that have with the circuitry needed to execute the more than 50 specialized MMX instructions.

NOTE When enabled, the autovectorize loops option (#pragma opt_vectorize_loops on) will use these instructions if possible.

This pragma corresponds to the MMX setting in the Extended Instruction Set menu of the x86 CodeGen panel. To check this setting, use __option (mmx), described in Checking Settings.