NOREGPARMS Compiler Directive

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REGPARMS

Options — C51 — Misc controls.

The NOREGPARMS directive forces the compiler to pass all function arguments in fixed memory locations. This directive generates parameter passing code which is compatible with Version 1 and Version 2 of the Keil C51 Compiler.

Note

• You may specify both the REGPARMS and NOREGPARMS directive several times within a source file to compile some functions using register parameters and other functions using the old style of parameter passing. For example:

  #pragma NOREGPARMS      /* Parm passing-old style */
  extern int old_func (int, char);
  
  #pragma REGPARMS        /* Parm passing-in registers */
  extern int new_func (int, char);
  
  main  ()  {
          char a;
          int  x1, x2;
          x1 = old_func (x2, a);
          x1 = new_func (x2, a);
  }
  

• You may use the NOREGPARMS directive when accessing assembly functions or libraries that were built with older tools.

REGPARMS

C51 SAMPLE.C NOREGPARMS