### use_extinst

Controls the code generator’s use of processor-specific instructions.

##### Syntax

#pragma use_extinst on | off | reset

##### Targets

Intel x86

##### Remarks

When off, all compiler generated code is targeted to run on a 486 processor with the exception of any inline assembly which may explicitly use newer instructions.

When on, the compiler uses instructions corresponding to the target processor whenever possible.

NOTE Some instruction subsets, like AMD 3DNow!, Intel’s MMX, and Intel’s SSE and SSE-2 instruction sets are generated only when additional options are activated.