m32r.h

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M32R_STACK_ALIGN (current_function_outgoing_args_size)

/* Offset from the stack pointer register to the first location at which
   outgoing arguments are placed.  */
#define STACK_POINTER_OFFSET 0

/* Offset of first parameter from the argument pointer register value.  */
#define FIRST_PARM_OFFSET(FNDECL) 0

/* A C expression whose value is RTL representing the address in a
   stack frame where the pointer to the caller's frame is stored.
   Assume that FRAMEADDR is an RTL expression for the address of the
   stack frame itself.

   If you don't define this macro, the default is to return the value
   of FRAMEADDR--that is, the stack frame address is also the address
   of the stack word that points to the previous frame.  */
/*define DYNAMIC_CHAIN_ADDRESS (FRAMEADDR)*/

/* A C expression whose value is RTL representing the value of the
   return address for the frame COUNT steps up from the current frame.
   FRAMEADDR is the frame pointer of the COUNT frame, or the frame
   pointer of the COUNT - 1 frame if `RETURN_ADDR_IN_PREVIOUS_FRAME'
   is defined.  */
/* The current return address is in r14.  */
#if 0 /* The default value should work.  */
#define RETURN_ADDR_RTX(COUNT, FRAME) \
(((COUNT) == -1)				\
 ? gen_rtx (REG, Pmode, 14)			\
 : copy_to_reg (gen_rtx (MEM, Pmode,		\
			 memory_address (Pmode, plus_constant ((FRAME), UNITS_PER_WORD)))))
#endif

/* Register to use for pushing function arguments.  */
#define STACK_POINTER_REGNUM 15

/* Base register for access to local variables of the function.  */
#define FRAME_POINTER_REGNUM 13

/* Base register for access to arguments of the function.  */
#define ARG_POINTER_REGNUM 16

/* The register number of the return address pointer register, which
   is used to access the current function's return address from the
   stack.  On some machines, the return address is not at a fixed
   offset from the frame pointer or stack pointer or argument
   pointer.  This register can be defined to point to the return
   address on the stack, and then be converted by `ELIMINABLE_REGS'
   into either the frame pointer or stack pointer.

   Do not define this macro unless there is no other way to get the
   return address from the stack.  */
/* ??? revisit */
/* #define RETURN_ADDRESS_POINTER_REGNUM */

/* Register in which static-chain is passed to a function.  This must
   not be a register used by the prologue.  */
#define STATIC_CHAIN_REGNUM 7

/* These aren't official macros.  */
#define PROLOGUE_TMP_REGNUM 4
#define RETURN_ADDR_REGNUM 14
/* #define GP_REGNUM 12 */
#define CARRY_REGNUM 17
#define M32R_MAX_INT_REGS 16

     
#define GPR_P(REGNO) ((unsigned) (REGNO) < M32R_MAX_INT_REGS)

/* Eliminating the frame and arg pointers.  */

/* A C expression which is nonzero if a function must have and use a
   frame pointer.  This expression is evaluated in the reload pass.
   If its value is nonzero the function will have a frame pointer.  */
#define FRAME_POINTER_REQUIRED \
(current_function_calls_alloca)

#if 0
/* C statement to store the difference between the frame pointer
   and the stack pointer values immediately after the function prologue.
   If `ELIMINABLE_REGS' is defined, this macro will be not be used and
   need not be defined.  */
#define INITIAL_FRAME_POINTER_OFFSET(VAR) \
((VAR) = m32r_compute_frame_size (get_frame_size ()))
#endif

/* If defined, this macro specifies a table of register pairs used to
   eliminate unneeded registers that point into the stack frame.  If
   it is not defined, the only elimination attempted by the compiler
   is to replace references to the frame pointer with references to
   the stack pointer.

   Note that the elimination of the argument pointer with the stack
   pointer is specified first since that is the preferred elimination.  */

#define ELIMINABLE_REGS \
{{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM },			\
 { ARG_POINTER_REGNUM,	 STACK_POINTER_REGNUM },			\
 { ARG_POINTER_REGNUM,   FRAME_POINTER_REGNUM }}			\

/* A C expression that returns non-zero if the compiler is allowed to
   try to replace register number FROM-REG with register number
   TO-REG.  This macro need only be defined if `ELIMINABLE_REGS' is
   defined, and will usually be the constant 1, since most of the
   cases preventing register elimination are things that the compiler
   already knows about.  */

#define CAN_ELIMINATE(FROM, TO) \
((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM		\
 ? ! frame_pointer_needed						\
 : 1)

/* This macro is similar to `INITIAL_FRAME_POINTER_OFFSET'.  It
   specifies the initial difference between the specified pair of
   registers.  This macro must be defined if `ELIMINABLE_REGS' is
   defined.  */

#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
{									\
  int size = m32r_compute_frame_size (get_frame_size ());		\
									\
 if ((FROM) == FRAME_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM)	\
   (OFFSET) = 0;							\
 else if ((FROM) == ARG_POINTER_REGNUM && (TO) == FRAME_POINTER_REGNUM)	\
   (OFFSET) = size - current_function_pretend_args_size;		\
 else if ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM)	\
   (OFFSET) = size - current_function_pretend_args_size;		\
  else									\
    abort ();								\
}

/* Function argument passing.  */

/* When a prototype says `char' or `short', really pass an `int'.  */
#define PROMOTE_PROTOTYPES

/* If defined, the maximum amount of space required for outgoing
   arguments will be computed and placed into the variable
   `current_function_outgoing_args_size'.  No space will be pushed
   onto the stack for each call; instead, the function prologue should
   increase the stack frame size by this amount.  */
#define ACCUMULATE_OUTGOING_ARGS

/* Define this macro if functions should assume that stack space has
   been allocated for arguments even when their values are passed in
   registers.

   The value of this macro is the size, in bytes, of the area
   reserved for arguments passed in registers for the function
   represented by FNDECL.

   This space can be allocated by the caller, or be a part of the
   machine-dependent stack frame: `OUTGOING_REG_PARM_STACK_SPACE' says
   which.  */
#if 0
#define REG_PARM_STACK_SPACE(FNDECL) \
(M32R_MAX_PARM_REGS * UNITS_PER_WORD)
#endif

/* Value is the number of bytes of arguments automatically
   popped when returning from a subroutine call.
   FUNDECL is the declaration node of the function (as a tree),
   FUNTYPE is the data type of the function (as a tree),
   or for a library call it is an identifier node for the subroutine name.
   SIZE is the number of bytes of arguments passed on the stack.  */
#define RETURN_POPS_ARGS(DECL, FUNTYPE, SIZE) 0

/* Nonzero if we do not know how to pass TYPE solely in registers. */
#define MUST_PASS_IN_STACK(MODE,TYPE)			\
  ((TYPE) != 0						\
   && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST	\
       || TREE_ADDRESSABLE (TYPE)))

/* Define a data type for recording info about an argument list
   during the scan of that argument list.  This data type should
   hold all necessary information about the function itself
   and about the args processed so far, enough to enable macros
   such as FUNCTION_ARG to determine where the next arg should go.  */
#define CUMULATIVE_ARGS int

/* Initialize a variable CUM of type CUMULATIVE_ARGS
   for a call to a function whose data type is FNTYPE.
   For a library call, FNTYPE is 0.  */
#define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT) \
((CUM) = 0)

/* The number of registers used for parameter passing.  Local to this file.  */
#define M32R_MAX_PARM_REGS 4

/* 1 if N is a possible register number for function argument passing.  */
#define FUNCTION_ARG_REGNO_P(N) \
((unsigned) (N) < M32R_MAX_PARM_REGS)

/* The ROUND_ADVANCE* macros are local to this file.  */
/* Round SIZE up to a word boundary.  */
#define ROUND_ADVANCE(SIZE) \
(((SIZE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)

/* Round arg MODE/TYPE up to the next word boundary.  */
#define ROUND_ADVANCE_ARG(MODE, TYPE) \
((MODE) == BLKmode				\
 ? ROUND_ADVANCE (int_size_in_bytes (TYPE))	\
 : ROUND_ADVANCE (GET_MODE_SIZE (MODE)))

/* Round CUM up to the necessary point for argument MODE/TYPE.  */
#if 0
#define ROUND_ADVANCE_CUM(CUM, MODE, TYPE) \
((((MODE) == BLKmode ? TYPE_ALIGN (TYPE) : GET_MODE_BITSIZE (MODE)) \
  > BITS_PER_WORD)	\
 ? ((CUM) + 1 & ~1)	\
 : (CUM))
#else
#define ROUND_ADVANCE_CUM(CUM, MODE, TYPE) (CUM)
#endif

/* Return boolean indicating arg of type TYPE and mode MODE will be passed in
   a reg.  This includes arguments that have to be passed by reference as the
   pointer to them is passed in a reg if one is available (and that is what
   we're given).
   This macro is only used in this file.  */
#define PASS_IN_REG_P(CUM, MODE, TYPE, NAMED) \
(ROUND_ADVANCE_CUM ((CUM), (MODE), (TYPE)) < M32R_MAX_PARM_REGS)

/* Determine where to put an argument to a function.
   Value is zero to push the argument on the stack,
   or a hard register in which to store the argument.

   MODE is the argument's machine mode.
   TYPE is the data type of the argument (as a tree).
    This is null for libcalls where that information may
    not be available.
   CUM is a variable of type CUMULATIVE_ARGS which gives info about
    the preceding args and about the function being called.
   NAMED is nonzero if this argument is a named parameter
    (otherwise it is an extra parameter matching an ellipsis).  */
/* On the M32R the first M32R_MAX_PARM_REGS args are normally in registers
   and the rest are pushed.  */
#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
(PASS_IN_REG_P ((CUM), (MODE), (TYPE), (NAMED))				\
 ? gen_rtx (REG, (MODE), ROUND_ADVANCE_CUM ((CUM), (MODE), (TYPE)))	\
 : 0)

/* ??? Quick hack to try to get varargs working the normal way.  */
#define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED) \
(((! current_function_varargs || (NAMED))				\
  && PASS_IN_REG_P ((CUM), (MODE), (TYPE), (NAMED)))			\
 ? gen_rtx (REG, (MODE), ROUND_ADVANCE_CUM ((CUM), (MODE), (TYPE)))	\
 : 0)

/* A C expression for the number of words, at the beginning of an
   argument, must be put in registers.  The value must be zero for
   arguments that are passed entirely in registers or that are entirely
   pushed on the stack.

   On some machines, certain arguments must be passed partially in
   registers and partially in memory.  On these machines, typically the
   first @var{n} words of arguments are passed in registers, and the rest
   on the stack.  If a multi-word argument (a @code{double} or a
   structure) crosses that boundary, its first few words must be passed
   in registers and the rest must be pushed.  This macro tells the
   compiler when this occurs, and how many of the words should go in
   registers.  */
#define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) \
  function_arg_partial_nregs (&CUM, (int)MODE, TYPE, NAMED)

/* A C expression that indicates when an argument must be passed by
   reference.  If nonzero for an argument, a copy of that argument is
   made in memory and a pointer to the argument is passed instead of
   the argument itself.  The pointer is passed in whatever way is
   appropriate for passing a pointer to that type.  */
/* All arguments greater than 8 bytes are passed this way.  */
#define FUNCTION_ARG_PASS_BY_REFERENCE(CUM, MODE, TYPE, NAMED) \
((TYPE) && int_size_in_bytes (TYPE) > 8)

/* Update the data in CUM to advance over an argument
   of mode MODE and data type TYPE.
   (TYPE is null for libcalls where that information may not be available.)  */
#define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
((CUM) = (ROUND_ADVANCE_CUM ((CUM), (MODE), (TYPE)) \
	  + ROUND_ADVANCE_ARG ((MODE), (TYPE))))

/* If defined, a C expression that gives the alignment boundary, in bits,
   of an argument with the specified mode and type.  If it is not defined, 
   PARM_BOUNDARY is used for all arguments.  */
#if 0
/* We assume PARM_BOUNDARY == UNITS_PER_WORD here.  */
#define FUNCTION_ARG_BOUNDARY(MODE, TYPE) \
(((TYPE) ? TYPE_ALIGN (TYPE) : GET_MODE_BITSIZE (MODE)) <= PARM_BOUNDARY \
 ? PARM_BOUNDARY \
 : 2 * PARM_BOUNDARY)
#endif

#if 0
/* If defined, is a C expression that produces the machine-specific
   code for a call to `__builtin_saveregs'.  This code will be moved
   to the very beginning of the function, before any parameter access
   are made.  The return value of this function should be an RTX that
   contains the value to use as the return of `__builtin_saveregs'.

   The argument ARGS is a `tree_list' containing the arguments that
   were passed to `__builtin_saveregs'.

   If this macro is not defined, the compiler will output an ordinary
   call to the library function `__builtin_saveregs'.  */
extern struct rtx *m32r_expand_builtin_savergs ();
#define EXPAND_BUILTIN_SAVEREGS(ARGS) m32r_expand_builtin_saveregs (ARGS)
#endif

/* This macro offers an alternative
   to using `__builtin_saveregs' and defining the macro
   `EXPAND_BUILTIN_SAVEREGS'.  Use it to store the anonymous register
   arguments into the stack so that all the arguments appear to have
   been passed consecutively on the stack.  Once this is done, you
   can use the standard implementation of varargs that works for
   machines that pass all their arguments on the stack.

   The argument ARGS_SO_FAR is the `CUMULATIVE_ARGS' data structure,
   containing the values that obtain after processing of the named
   arguments.  The arguments MODE and TYPE describe the last named
   argument--its machine mode and its data type as a tree node.

   The macro implementation should do two things: first, push onto the
   stack all the argument registers *not* used for the named
   arguments, and second, store the size of the data thus pushed into
   the `int'-valued variable whose name is supplied as the argument
   PRETEND_SIZE.  The value that you store here will serve as
   additional offset for setting up the stack frame.

   If the argument NO_RTL is nonzero, it means that the
   arguments of the function are being analyzed for the second time.
   This happens for an inline function, which is not actually
   compiled until the end of the source file.  The macro
   `SETUP_INCOMING_VARARGS' should not generate any instructions in
   this case.  */

#define SETUP_INCOMING_VARARGS(ARGS_SO_FAR, MODE, TYPE, PRETEND_SIZE, NO_RTL) \
m32r_setup_incoming_varargs (&ARGS_SO_FAR, MODE, TYPE, &PRETEND_SIZE, NO_RTL)

/* Function results.  */