MASM Macro Directives in Inline Assembly
Microsoft Specific
The inline assembler is not a macro assembler. You cannot use MASM macro directives (MACRO, REPT, IRC, IRP, and ENDM) or macro operators (<>, !, &, %, and .TYPE). An __asm block can use C preprocessor directives, however. See Using C or C++ in __asm Blocks for more information.
END Microsoft Specific