C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
Processor-Specific Instructions
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─────C/C++ Compiler─────────────────────────────────────────────────────────
 
     Use the Processor selection to enable the instruction set for any
     of the following processors:
 
                     Command-Line     Code          Preprocessor
     Processor       Option           Generated     Identifier
 
     8086/8088       /G0              16 bit        _M_I8086
     80186/80188     /G1              16 bit
     80286           /G2              16 bit        _M_I286
     80386           /G3              32 bit *      _M_I386
     80486           /G4              32 bit *
 
     * reserved for future use
 
     NOTES:
 
          ■ Programs compiled for a smaller-numbered CPU run on any
            larger-numbered CPU. For example, working programs compiled
            for an 8086 will run on an 80386.
 
          ■ Programs compiled for a larger-numbered CPU will not run on a
            smaller-numbered CPU. For example, working programs compiled
            for an 80286, 80386, or 80486 will not run on an 8086.
 
          ■ Note that the /G3 and /G4 options are reserved for future
            32-bit versions of the compiler.
                                    -♦-