Inline Assembly Identifiers

For the Cosmic compiler, you need to place an underscore ( _) in front of each identifier, but for this compiler you can use the same name both for C and inline assembly. In addition, to use the address of a variable, place a @ in front of variables for better type-safety with this compiler. Use a conditional block like the one below in the following listing, to compensate for the differences in compilers.

Listing: Using a Conditional Block



#ifdef __MWERKS__

  ldx @myVariable,x

  jsr MyFunction

#else

  ldx _myVariable,x

  jsr _MyFunction

#endif

You can also use macros to cope with the compiler differences. The following listing shows the preferred method.

Listing: Using a Macro



#ifdef __MWERKS__

  #define USCR(ident)  ident

  #define USCRA(ident) @ ident

#else /* for COSMIC, add a _ (underscore) to each ident */

  #define USCR(ident)  _##ident

  #define USCRA(ident) _##ident

#endif

The source can use the macros:

  ldx USCRA(myVariable),x

  jsr USCR(MyFunction)