i860.h

gcc-2.95.3 Linux下最常用的C编译器

   rather than an FP reg.  */

#define PREFERRED_RELOAD_CLASS(X,CLASS)  \
  ((CLASS) == ALL_REGS && GET_CODE (X) == CONST_INT ? GENERAL_REGS	\
   : ((GET_MODE (X) == HImode || GET_MODE (X) == QImode)		\
      && (CLASS) == ALL_REGS)						\
   ? GENERAL_REGS							\
   : (GET_CODE (X) == CONST_DOUBLE					\
      && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT			\
      && ! CONST_DOUBLE_OK_FOR_LETTER_P (X, 'G'))			\
   ? ((CLASS) == ALL_REGS && GET_MODE (X) == SFmode ? GENERAL_REGS	\
      : (CLASS) == GENERAL_REGS && GET_MODE (X) == SFmode ? (CLASS)	\
      : NO_REGS)							\
   : (CLASS))

/* Return the register class of a scratch register needed to copy IN into
   a register in CLASS in MODE.  If it can be done directly, NO_REGS is
   returned.  */

#define SECONDARY_INPUT_RELOAD_CLASS(CLASS,MODE,IN) \
  ((CLASS) == FP_REGS && CONSTANT_P (IN) ? GENERAL_REGS : NO_REGS)

/* Return the maximum number of consecutive registers
   needed to represent mode MODE in a register of class CLASS.  */
/* On the i860, this is the size of MODE in words.  */
#define CLASS_MAX_NREGS(CLASS, MODE)	\
  ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)

/* Stack layout; function entry, exit and calling.  */

/* Define this if pushing a word on the stack
   makes the stack pointer a smaller address.  */
#define STACK_GROWS_DOWNWARD

/* Define this if the nominal address of the stack frame
   is at the high-address end of the local variables;
   that is, each additional local variable allocated
   goes at a more negative offset in the frame.  */
#define FRAME_GROWS_DOWNWARD

/* Offset within stack frame to start allocating local variables at.
   If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
   first local allocated.  Otherwise, it is the offset to the BEGINNING
   of the first local allocated.  */
#define STARTING_FRAME_OFFSET 0

/* If we generate an insn to push BYTES bytes,
   this says how many the stack pointer really advances by.
   On the i860, don't define this because there are no push insns.  */
/*  #define PUSH_ROUNDING(BYTES) */

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

/* 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(FUNDECL,FUNTYPE,SIZE) 0

/* Define how to find the value returned by a function.
   VALTYPE is the data type of the value (as a tree).
   If the precise function being called is known, FUNC is its FUNCTION_DECL;
   otherwise, FUNC is 0.  */

/* On the i860, the value register depends on the mode.  */

#define FUNCTION_VALUE(VALTYPE, FUNC)  \
  gen_rtx (REG, TYPE_MODE (VALTYPE),				\
	   (GET_MODE_CLASS (TYPE_MODE (VALTYPE)) == MODE_FLOAT	\
	    ? 40 : 16))

/* Define how to find the value returned by a library function
   assuming the value has mode MODE.  */

#define LIBCALL_VALUE(MODE)				\
  gen_rtx (REG, MODE,					\
	   (GET_MODE_CLASS ((MODE)) == MODE_FLOAT	\
	    ? 40 : 16))

/* 1 if N is a possible register number for a function value
   as seen by the caller.  */

#define FUNCTION_VALUE_REGNO_P(N) ((N) == 40 || (N) == 16)

/* 1 if N is a possible register number for function argument passing.
   On the i860, these are r16-r27 and f8-f15.  */

#define FUNCTION_ARG_REGNO_P(N)		\
  (((N) < 28 && (N) > 15) || ((N) < 48 && (N) >= 40))

/* 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.

   On the i860, we must count separately the number of general registers used
   and the number of float registers used.  */

struct cumulative_args { int ints, floats; };
#define CUMULATIVE_ARGS struct cumulative_args

/* 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 i860, the general-reg offset normally starts at 0,
   but starts at 4 bytes
   when the function gets a structure-value-address as an
   invisible first argument.  */

#define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT)	\
 ((CUM).ints = ((FNTYPE) != 0 && aggregate_value_p (TREE_TYPE ((FNTYPE))) \
		? 4 : 0),			\
  (CUM).floats = 0)

/* Machine-specific subroutines of the following macros.  */
#define CEILING(X,Y)  (((X) + (Y) - 1) / (Y))
#define ROUNDUP(X,Y)  (CEILING ((X), (Y)) * (Y))

/* 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.)
   Floats, and doubleword ints, are returned in f regs;
   other ints, in r regs.
   Aggregates, even short ones, are passed in memory.  */

#define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)		\
 ((TYPE) != 0 && (TREE_CODE ((TYPE)) == RECORD_TYPE		\
		  || TREE_CODE ((TYPE)) == UNION_TYPE)		\
  ? 0								\
  : GET_MODE_CLASS ((MODE)) == MODE_FLOAT || (MODE) == DImode	\
  ? ((CUM).floats = (ROUNDUP ((CUM).floats, GET_MODE_SIZE ((MODE)))	\
		     + ROUNDUP (GET_MODE_SIZE (MODE), 4)))	\
  : GET_MODE_CLASS ((MODE)) == MODE_INT				\
  ? ((CUM).ints = (ROUNDUP ((CUM).ints, GET_MODE_SIZE ((MODE))) \
		   + ROUNDUP (GET_MODE_SIZE (MODE), 4)))	\
  : 0)

/* 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 i860, the first 12 words of integer arguments go in r16-r27,
   and the first 8 words of floating arguments go in f8-f15.
   DImode values are treated as floats.  */

#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)		\
 ((TYPE) != 0 && (TREE_CODE ((TYPE)) == RECORD_TYPE	\
		  || TREE_CODE ((TYPE)) == UNION_TYPE)	\
  ? 0							\
  : GET_MODE_CLASS ((MODE)) == MODE_FLOAT || (MODE) == DImode	\
  ? (ROUNDUP ((CUM).floats, GET_MODE_SIZE ((MODE))) < 32	\
     ? gen_rtx (REG, (MODE),				\
		40+(ROUNDUP ((CUM).floats,		\
			     GET_MODE_SIZE ((MODE)))	\
		    / 4))				\
     : 0)						\
  : GET_MODE_CLASS ((MODE)) == MODE_INT			\
  ? (ROUNDUP ((CUM).ints, GET_MODE_SIZE ((MODE))) < 48	\
     ? gen_rtx (REG, (MODE),				\
		16+(ROUNDUP ((CUM).ints,		\
			     GET_MODE_SIZE ((MODE)))	\
		    / 4))				\
     : 0)						\
  : 0)

/* For an arg passed partly in registers and partly in memory,
   this is the number of registers used.
   For args passed entirely in registers or entirely in memory, zero.  */

#define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) 0

/* 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.  */

#define FUNCTION_ARG_BOUNDARY(MODE, TYPE)			\
  (((TYPE) != 0)						\
   ? ((TYPE_ALIGN(TYPE) <= PARM_BOUNDARY)			\
      ? PARM_BOUNDARY						\
      : TYPE_ALIGN(TYPE))					\
   : ((GET_MODE_ALIGNMENT(MODE) <= PARM_BOUNDARY)		\
      ? PARM_BOUNDARY						\
      : GET_MODE_ALIGNMENT(MODE)))

/* This macro generates the assembly code for function entry.

   FILE is a stdio stream to output the code to.
   SIZE is an int: how many units of temporary storage to allocate.
*/

#define FUNCTION_PROLOGUE(FILE, SIZE) function_prologue ((FILE), (SIZE))

/* Output a no-op just before the beginning of the function,
   to ensure that there does not appear to be a delayed branch there.
   Such a thing would confuse interrupt recovery.  */
#define ASM_OUTPUT_FUNCTION_PREFIX(FILE,NAME) \
  fprintf (FILE, "\tnop\n")

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

#define FUNCTION_PROFILER(FILE, LABELNO)  \
   abort ();

/* 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 1

/* This macro generates the assembly code for function exit.

   FILE is a stdio stream to output the code to.
   SIZE is an int: how many units of temporary storage to allocate.

   The function epilogue should not depend on the current stack pointer!
   It should use the frame pointer only.  This is mandatory because
   of alloca; we also take advantage of it to omit stack adjustments
   before returning.
*/

#define FUNCTION_EPILOGUE(FILE, SIZE) function_epilogue ((FILE), (SIZE))

/* Store in the variable DEPTH the initial difference between the
   frame pointer reg contents and the stack pointer reg contents,
   as of the start of the function body.  This depends on the layout
   of the fixed parts of the stack frame and on how registers are saved.

   On the i860, FRAME_POINTER_REQUIRED is always 1, so the definition of this
   macro doesn't matter.  But it must be defined.  */

#define INITIAL_FRAME_POINTER_OFFSET(DEPTH) \
  do { (DEPTH) = 0; } while (0)

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

/* On the i860, the trampoline contains five instructions:
     orh #TOP_OF_FUNCTION,r0,r31
     or #BOTTOM_OF_FUNCTION,r31,r31
     orh #TOP_OF_STATIC,r0,r29
     bri r31
     or #BOTTOM_OF_STATIC,r29,r29  */
#define TRAMPOLINE_TEMPLATE(FILE)					\
{									\
  ASM_OUTPUT_INT (FILE, GEN_INT (0xec1f0000));	\
  ASM_OUTPUT_INT (FILE, GEN_INT (0xe7ff0000));	\
  ASM_OUTPUT_INT (FILE, GEN_INT (0xec1d0000));	\
  ASM_OUTPUT_INT (FILE, GEN_INT (0x4000f800));	\
  ASM_OUTPUT_INT (FILE, GEN_INT (0xe7bd0000));	\
}

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

#define TRAMPOLINE_SIZE 20

/* 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.

   Store hi function at +0, low function at +4,
   hi static at +8, low static at +16  */

#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)			\
{									\
  rtx cxt = force_reg (Pmode, CXT);					\
  rtx fn = force_reg (Pmode, FNADDR);					\
  rtx hi_cxt = expand_shift (RSHIFT_EXPR, SImode, cxt,			\
			     size_int (16), 0, 0);			\
  rtx hi_fn = expand_shift (RSHIFT_EXPR, SImode, fn,			\
			    size_int (16), 0, 0);			\
  emit_move_insn (gen_rtx (MEM, HImode, plus_constant (TRAMP, 16)),	\
		  gen_lowpart (HImode, cxt));				\
  emit_move_insn (gen_rtx (MEM, HImode, plus_constant (TRAMP, 4)),	\
		  gen_lowpart (HImode, fn));				\
  emit_move_insn (gen_rtx (MEM, HImode, plus_constant (TRAMP, 8)),	\
		  gen_lowpart (HImode, hi_cxt));			\
  emit_move_insn (gen_rtx (MEM, HImode, plus_constant (TRAMP, 0)),	\
		  gen_lowpart (HImode, hi_fn));				\
}

/* Addressing modes, and classification of registers for them.  */

/* #define HAVE_POST_INCREMENT 0 */
/* #define HAVE_POST_DECREMENT 0 */

/* #define HAVE_PRE_DECREMENT 0 */
/* #define HAVE_PRE_INCREMENT 0 */

/* 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) \
((REGNO) < 32 || (unsigned) reg_renumber[REGNO] < 32)
#define REGNO_OK_FOR_BASE_P(REGNO) \
((REGNO) < 32 || (unsigned) reg_renumber[REGNO] < 32)
#define REGNO_OK_FOR_FP_P(REGNO) \
(((REGNO) ^ 0x20) < 32 || (unsigned) (reg_renumber[REGNO] ^ 0x20) < 32)

/* Now macros that check whether X is a register and also,
   strictly, whether it is in a specified class.

   These macros are specific to the i860, and may be used only
   in code for printing assembler insns and in conditions for
   define_optimization.  */

/* 1 if X is an fp register.  */

#define FP_REG_P(X) (REG_P (X) && REGNO_OK_FOR_FP_P (REGNO (X)))

/* Maximum number of registers that can appear in a valid memory address.  */

#define MAX_REGS_PER_ADDRESS 2

/* Recognize any constant value 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 || GET_CODE (X) == CONST		\
   || GET_CODE (X) == HIGH)

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

   On the Sparc, this is anything but a CONST_DOUBLE.
   Let's try permitting CONST_DOUBLEs and see what happens.  */

#define LEGITIMATE_CONSTANT_P(X) 1

/* 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.