/*	PDP11 Registers */	/* scratch registers */# define R0 0# define R1 1	/* register variables */# define R2 2# define R3 3# define R4 4	/* special purpose */# define R5 5	/* frame pointer */# define SP 6	/* stack pointer */# define PC 7	/* program counter */	/* floating registers */# define FR0 8# define FR1 9# define FR2 10# define FR3 11# define FR4 12# define FR5 13# define SAVEREGION 8 /* number of bytes for save area */# define BYTEOFF(x) ((x)&01)# define wdal(k) (BYTEOFF(k)==0)# define BITOOR(x) ((x)>>3)  /* bit offset to oreg offset */# define REGSZ 14# define TMPREG R5# define STOARG(p)     /* just evaluate the arguments, and be done with it... */# define STOFARG(p)# define STOSTARG(p)# define genfcall(a,b) gencall(a,b)	/* shape for constants between -128 and 127 */# define SCCON (SPECIAL+100)	/* shape for constants between 0 and 32767 */# define SICON (SPECIAL+101)# define MYREADER(p) myreader(p)extern int fltused;	/* calls can be nested on the PDP-11 */# define NESTCALLS