h8300.h

linux下的gcc编译器

   library function if any.  */

#define CUMULATIVE_ARGS struct cum_arg
struct cum_arg
{
  int nbytes;
  struct rtx_def *libcall;
};

/* 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.

   On the H8/300, the offset starts at 0.  */

#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT)	\
 ((CUM).nbytes = 0, (CUM).libcall = LIBNAME)

/* 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).nbytes += ((MODE) != BLKmode					\
  ? (GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) & -UNITS_PER_WORD	\
  : (int_size_in_bytes (TYPE) + UNITS_PER_WORD - 1) & -UNITS_PER_WORD))

/* Define where to put the arguments 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 H8/300 all normal args are pushed, unless -mquickcall in which
   case the first 3 arguments are passed in registers.
   See function `function_arg'.  */

#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
  function_arg (&CUM, MODE, TYPE, NAMED)

/* Output assembler code to FILE to increment profiler label # LABELNO
   for profiling a function entry.  */

#define FUNCTION_PROFILER(FILE, LABELNO)  \
  fprintf (FILE, "\t%s\t#LP%d,%s\n\tjsr @mcount\n", \
	   h8_mov_op, (LABELNO), h8_reg_names[0]);

/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
   the stack pointer does not matter.  The value is tested only in
   functions that have frame pointers.
   No definition is equivalent to always zero.  */

#define EXIT_IGNORE_STACK 0

/* Output assembler code for a block containing the constant parts
   of a trampoline, leaving space for the variable parts.

   H8/300
	      vvvv context
   1 0000 7900xxxx		mov.w	#0x1234,r3
   2 0004 5A00xxxx		jmp	@0x1234
	      ^^^^ function

   H8/300H
	      vvvvvvvv context
   2 0000 7A00xxxxxxxx		mov.l	#0x12345678,er3
   3 0006 5Axxxxxx		jmp	@0x123456
	    ^^^^^^ function
*/

#define TRAMPOLINE_TEMPLATE(FILE)				\
  do								\
    {								\
      if (TARGET_H8300)						\
	{							\
	  fprintf (FILE, "\tmov.w	#0x1234,r3\n");		\
	  fprintf (FILE, "\tjmp	@0x1234\n");			\
	}							\
      else							\
	{							\
	  fprintf (FILE, "\tmov.l	#0x12345678,er3\n");	\
	  fprintf (FILE, "\tjmp	@0x123456\n");			\
	}							\
    }								\
  while (0)

/* Length in units of the trampoline for entering a nested function.  */

#define TRAMPOLINE_SIZE (TARGET_H8300 ? 8 : 12)

/* Emit RTL insns to initialize the variable parts of a trampoline.
   FNADDR is an RTX for the address of the function's pure code.
   CXT is an RTX for the static chain value for the function.  */

#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)			    \
{									    \
  emit_move_insn (gen_rtx_MEM (Pmode, plus_constant ((TRAMP), 2)), CXT);    \
  emit_move_insn (gen_rtx_MEM (Pmode, plus_constant ((TRAMP), 6)), FNADDR); \
  if (TARGET_H8300H || TARGET_H8300S)					    \
    emit_move_insn (gen_rtx_MEM (QImode, plus_constant ((TRAMP), 6)),	    \
		    GEN_INT (0x5A));					    \
}

/* Addressing modes, and classification of registers for them.  */

#define HAVE_POST_INCREMENT 1
#define HAVE_PRE_DECREMENT 1

/* Macros to check register numbers against specific register classes.  */

/* These assume that REGNO is a hard or pseudo reg number.
   They give nonzero only if REGNO is a hard reg of the suitable class
   or a pseudo reg currently allocated to a suitable hard reg.
   Since they use reg_renumber, they are safe only once reg_renumber
   has been allocated, which happens in local-alloc.c.  */

#define REGNO_OK_FOR_INDEX_P(regno) 0

#define REGNO_OK_FOR_BASE_P(regno) \
  (((regno) < FIRST_PSEUDO_REGISTER && regno != 8) || reg_renumber[regno] >= 0)

/* Maximum number of registers that can appear in a valid memory address.  */

#define MAX_REGS_PER_ADDRESS 1

/* 1 if X is an rtx for a constant that is a valid address.  */

#define CONSTANT_ADDRESS_P(X)					\
  (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF	\
   || (GET_CODE (X) == CONST_INT				\
       /* We handle signed and unsigned offsets here.  */	\
       && INTVAL (X) > (TARGET_H8300 ? -0x10000 : -0x1000000)	\
       && INTVAL (X) < (TARGET_H8300 ? 0x10000 : 0x1000000))	\
   || (GET_CODE (X) == HIGH || GET_CODE (X) == CONST))

/* Nonzero if the constant value X is a legitimate general operand.
   It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE.  */

#define LEGITIMATE_CONSTANT_P(X) (GET_CODE (X) != CONST_DOUBLE)

/* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
   and check its validity for a certain class.
   We have two alternate definitions for each of them.
   The usual definition accepts all pseudo regs; the other rejects
   them unless they have been allocated suitable hard regs.
   The symbol REG_OK_STRICT causes the latter definition to be used.

   Most source files want to accept pseudo regs in the hope that
   they will get allocated to the class that the insn wants them to be in.
   Source files for reload pass need to be strict.
   After reload, it makes no difference, since pseudo regs have
   been eliminated by then.  */

#ifndef REG_OK_STRICT

/* Nonzero if X is a hard reg that can be used as an index
   or if it is a pseudo reg.  */
#define REG_OK_FOR_INDEX_P(X) 0
/* Nonzero if X is a hard reg that can be used as a base reg
   or if it is a pseudo reg.  */
/* Don't use REGNO_OK_FOR_BASE_P here because it uses reg_renumber.  */
#define REG_OK_FOR_BASE_P(X) \
	(REGNO (X) >= FIRST_PSEUDO_REGISTER || REGNO (X) != 8)
#define REG_OK_FOR_INDEX_P_STRICT(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
#define REG_OK_FOR_BASE_P_STRICT(X) REGNO_OK_FOR_BASE_P (REGNO (X))
#define STRICT 0

#else

/* Nonzero if X is a hard reg that can be used as an index.  */
#define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
/* Nonzero if X is a hard reg that can be used as a base reg.  */
#define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
#define STRICT 1

#endif

/* Extra constraints.  */

#define OK_FOR_R(OP)					\
  (GET_CODE (OP) == CONST_INT				\
   ? !h8300_shift_needs_scratch_p (INTVAL (OP), QImode)	\
   : 0)

#define OK_FOR_S(OP)					\
  (GET_CODE (OP) == CONST_INT				\
   ? !h8300_shift_needs_scratch_p (INTVAL (OP), HImode)	\
   : 0)

#define OK_FOR_T(OP)					\
  (GET_CODE (OP) == CONST_INT				\
   ? !h8300_shift_needs_scratch_p (INTVAL (OP), SImode)	\
   : 0)

/* 'U' if valid for a bset destination;
   i.e. a register, register indirect, or the eightbit memory region
   (a SYMBOL_REF with an SYMBOL_REF_FLAG set).

   On the H8S 'U' can also be a 16bit or 32bit absolute.  */
#define OK_FOR_U(OP)							\
  ((GET_CODE (OP) == REG && REG_OK_FOR_BASE_P (OP))			\
   || (GET_CODE (OP) == MEM && GET_CODE (XEXP (OP, 0)) == REG		\
       && REG_OK_FOR_BASE_P (XEXP (OP, 0)))				\
   || (GET_CODE (OP) == MEM && GET_CODE (XEXP (OP, 0)) == SYMBOL_REF	\
       && TARGET_H8300S)						\
   || (GET_CODE (OP) == MEM && GET_CODE (XEXP (OP, 0)) == CONST		\
       && GET_CODE (XEXP (XEXP (OP, 0), 0)) == PLUS			\
       && GET_CODE (XEXP (XEXP (XEXP (OP, 0), 0), 0)) == SYMBOL_REF	\
       && GET_CODE (XEXP (XEXP (XEXP (OP, 0), 0), 1)) == CONST_INT	\
       && (TARGET_H8300S						\
	   || SYMBOL_REF_FLAG (XEXP (XEXP (XEXP (OP, 0), 0), 0))))	\
   || (GET_CODE (OP) == MEM						\
       && h8300_eightbit_constant_address_p (XEXP (OP, 0)))		\
   || (GET_CODE (OP) == MEM && TARGET_H8300S				\
       && GET_CODE (XEXP (OP, 0)) == CONST_INT))

#define EXTRA_CONSTRAINT(OP, C)			\
  ((C) == 'R' ? OK_FOR_R (OP) :			\
   (C) == 'S' ? OK_FOR_S (OP) :			\
   (C) == 'T' ? OK_FOR_T (OP) :			\
   (C) == 'U' ? OK_FOR_U (OP) :			\
   0)

/* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
   that is a valid memory address for an instruction.
   The MODE argument is the machine mode for the MEM expression
   that wants to use this address.

   The other macros defined here are used only in GO_IF_LEGITIMATE_ADDRESS,
   except for CONSTANT_ADDRESS_P which is actually
   machine-independent.

   On the H8/300, a legitimate address has the form
   REG, REG+CONSTANT_ADDRESS or CONSTANT_ADDRESS.  */

/* Accept either REG or SUBREG where a register is valid.  */

#define RTX_OK_FOR_BASE_P(X)				\
  ((REG_P (X) && REG_OK_FOR_BASE_P (X))			\
   || (GET_CODE (X) == SUBREG && REG_P (SUBREG_REG (X))	\
       && REG_OK_FOR_BASE_P (SUBREG_REG (X))))

#define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR)		\
  if (RTX_OK_FOR_BASE_P (X)) goto ADDR;			\
  if (CONSTANT_ADDRESS_P (X)) goto ADDR;		\
  if (GET_CODE (X) == PLUS				\
      && CONSTANT_ADDRESS_P (XEXP (X, 1))		\
      && RTX_OK_FOR_BASE_P (XEXP (X, 0))) goto ADDR;

/* Try machine-dependent ways of modifying an illegitimate address
   to be legitimate.  If we find one, return the new, valid address.
   This macro is used in only one place: `memory_address' in explow.c.

   OLDX is the address as it was before break_out_memory_refs was called.
   In some cases it is useful to look at this to decide what needs to be done.

   MODE and WIN are passed so that this macro can use
   GO_IF_LEGITIMATE_ADDRESS.

   It is always safe for this macro to do nothing.  It exists to recognize
   opportunities to optimize the output.

   For the H8/300, don't do anything.  */

#define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)  {}

/* Go to LABEL if ADDR (a legitimate address expression)
   has an effect that depends on the machine mode it is used for.

   On the H8/300, the predecrement and postincrement address depend thus
   (the amount of decrement or increment being the length of the operand).  */

#define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL) \
  if (GET_CODE (ADDR) == POST_INC || GET_CODE (ADDR) == PRE_DEC) goto LABEL;

/* Specify the machine mode that this machine uses
   for the index in the tablejump instruction.  */
#define CASE_VECTOR_MODE Pmode

/* Define as C expression which evaluates to nonzero if the tablejump
   instruction expects the table to contain offsets from the address of the
   table.
   Do not define this if the table should contain absolute addresses.  */
/*#define CASE_VECTOR_PC_RELATIVE 1 */

/* Define this as 1 if `char' should by default be signed; else as 0.

   On the H8/300, sign extension is expensive, so we'll say that chars
   are unsigned.  */
#define DEFAULT_SIGNED_CHAR 0

/* This flag, if defined, says the same insns that convert to a signed fixnum
   also convert validly to an unsigned one.  */
#define FIXUNS_TRUNC_LIKE_FIX_TRUNC

/* Max number of bytes we can move from memory to memory
   in one reasonably fast instruction.  */
#define MOVE_MAX	(TARGET_H8300H || TARGET_H8300S ? 4 : 2)
#define MAX_MOVE_MAX	4

/* Nonzero if access to memory by bytes is slow and undesirable.  */
#define SLOW_BYTE_ACCESS TARGET_SLOWBYTE

/* Define if shifts truncate the shift count
   which implies one can omit a sign-extension or zero-extension
   of a shift count.  */
/* #define SHIFT_COUNT_TRUNCATED */

/* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
   is done just by pretending it is already truncated.  */
#define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1

/* Specify the machine mode that pointers have.
   After generation of rtl, the compiler makes no further distinction
   between pointers and any other objects of this machine mode.  */
#define Pmode								      \
  ((TARGET_H8300H || TARGET_H8300S) && !TARGET_NORMAL_MODE ? SImode : HImode)

/* ANSI C types.
   We use longs for the H8/300H and the H8S because ints can be 16 or 32.