Extensiones de Microsoft

asm-statement:
  __asm assembly-instruction ; _optar
  __asm { assembly-instruction-list } ; _optar

assembly-instruction-list:
  assembly-instruction ; _optar
  assembly-instruction ; assembly-instruction-list ; _optar

ms-modifier-list:
  ms-modifier ms-modifier-list _optar

ms-modifier:
 __cdecl
 __fastcall
 __stdcall
  __syscall (reservado para implementaciones futuras)
  __oldcall (reservado para implementaciones futuras)
  __unaligned (reservado para implementaciones futuras)
 based-modifier

based-modifier:
  __based ( based-type )

based-type:
 name