we32k.h

gcc-2.95.3 Linux下最常用的C编译器

   On the we32k, this is a single integer, which is a number of bytes
   of arguments scanned so far.  */

#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.

   On the we32k, the offset starts at 0.  */

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

/* 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) += ((MODE) != BLKmode			\
	    ? (GET_MODE_SIZE (MODE) + 3) & ~3	\
	    : (int_size_in_bytes (TYPE) + 3) & ~3))

/* 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 we32000 all args are pushed */

#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) 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

/* 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.
   Refer to the array `regs_ever_live' to determine which registers
   to save; `regs_ever_live[I]' is nonzero if register number I
   is ever used in the function.  This macro is responsible for
   knowing which registers should not be saved even if used.  */

#define FUNCTION_PROLOGUE(FILE, SIZE)     \
{ register int nregs_to_save;					\
  register int regno;						\
  extern char call_used_regs[];					\
  nregs_to_save = 0;						\
  for (regno = 8; regno > 2; regno--)				\
    if (regs_ever_live[regno] && ! call_used_regs[regno])	\
      nregs_to_save = (9 - regno);				\
  fprintf (FILE, "\tsave &%d\n", nregs_to_save);  		\
  if (SIZE)							\
    fprintf (FILE, "\taddw2 &%d,%%sp\n", ((SIZE) + 3) & ~3);	}

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

#define FUNCTION_PROFILER(FILE, LABELNO)  \
  fprintf (FILE, "\tmovw &.LP%d,%%r0\n\tjsb _mcount\n", (LABELNO))

/* Output assembler code to FILE to initialize this source file's
   basic block profiling info, if that has not already been done.  */

#define FUNCTION_BLOCK_PROFILER(FILE, LABELNO)  \
  fprintf (FILE, "\tcmpw .LPBX0,&0\n\tjne .LPI%d\n\tpushw &.LPBX0\n\tcall &1,__bb_init_func\n.LPI%d:\n",  \
	   LABELNO, LABELNO);

/* Output assembler code to FILE to increment the entry-count for
   the BLOCKNO'th basic block in this source file.  */

#define BLOCK_PROFILER(FILE, BLOCKNO)	\
  fprintf (FILE, "\taddw2 &1,.LPBX2+%d\n", 4 * BLOCKNO)

/* 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

/* This macro generates the assembly code for function exit,
   on machines that need it.  If FUNCTION_EPILOGUE is not defined
   then individual return instructions are generated for each
   return statement.  Args are same as for FUNCTION_PROLOGUE.

   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) \
{ register int nregs_to_restore;				\
  register int regno;						\
  extern char call_used_regs[];					\
  nregs_to_restore = 0;						\
  for (regno = 8; regno > 2; regno--)				\
    if (regs_ever_live[regno] && ! call_used_regs[regno])	\
       nregs_to_restore = (9 - regno);				\
  fprintf (FILE, "\tret &%d\n", nregs_to_restore);  		}

/* 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 we32k, 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) (DEPTH) = 0;

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

/* On the we32k, the trampoline contains two instructions:
     mov #STATIC,%r8
     jmp #FUNCTION */

#define TRAMPOLINE_TEMPLATE(FILE)					\
{									\
  ASM_OUTPUT_SHORT (FILE, GEN_INT (0x844f));				\
  ASM_OUTPUT_SHORT (FILE, const0_rtx);					\
  ASM_OUTPUT_SHORT (FILE, const0_rtx);					\
  ASM_OUTPUT_CHAR (FILE, GEN_INT (0x48));				\
  ASM_OUTPUT_SHORT (FILE, GEN_INT (0x247f));				\
  ASM_OUTPUT_SHORT (FILE, const0_rtx);					\
  ASM_OUTPUT_SHORT (FILE, const0_rtx);					\
}

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

#define TRAMPOLINE_SIZE 13

/* 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, SImode, plus_constant (TRAMP, 2)), CXT); \
  emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 9)), FNADDR); \
}

/* Generate calls to memcpy() and memset() rather
   than bcopy() and bzero() */
#define TARGET_MEM_FUNCTIONS

/* 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)	0

#define REGNO_OK_FOR_BASE_P(REGNO)	\
  ((REGNO) < 11 || (REGNO) == 12 ||	\
  (unsigned)reg_renumber[REGNO] < 11 || (unsigned)reg_renumber[REGNO] == 12)

/* Maximum number of registers that can appear in a valid memory address.  */

#define MAX_REGS_PER_ADDRESS 1

/* 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.  */

#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.
   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.  */
#define REG_OK_FOR_BASE_P(X) \
  (REGNO(X) < 11 || REGNO(X) == 12 || REGNO(X) >= FIRST_PSEUDO_REGISTER)

#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))

#endif

/* 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. */

#define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL)			\
{ register rtx Addr = X;						\
  if ((MODE) == QImode || (MODE) == HImode ||				\
    (MODE) == PSImode || (MODE) == SImode || (MODE) == SFmode)		\
    if (GET_CODE(Addr) == MEM)						\
      Addr = XEXP(Addr, 0);						\
  if (CONSTANT_ADDRESS_P(Addr))						\
    goto LABEL;								\
  if (REG_P(Addr) && REG_OK_FOR_BASE_P(Addr))				\
    goto LABEL;								\
  if (GET_CODE(Addr) == PLUS &&						\
    ((REG_P(XEXP(Addr, 0)) && REG_OK_FOR_BASE_P(XEXP(Addr, 0)) &&	\
     CONSTANT_ADDRESS_P(XEXP(Addr, 1))) ||				\
     (REG_P(XEXP(Addr, 1)) && REG_OK_FOR_BASE_P(XEXP(Addr, 1)) &&	\
     CONSTANT_ADDRESS_P(XEXP(Addr, 0)))))				\
    goto LABEL;								\
}

/* 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. */

#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. */

#define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL)	{ }

/* Specify the machine mode that this machine uses
   for the index in the tablejump instruction.  */
#define CASE_VECTOR_MODE SImode

/* 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 */

/* Specify the tree operation to be used to convert reals to integers.  */
#define IMPLICIT_FIX_EXPR FIX_ROUND_EXPR

/* This is the kind of divide that is easiest to do in the general case.  */
#define EASY_DIV_EXPR TRUNC_DIV_EXPR

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

/* Max number of bytes we can move from memory to memory
   in one reasonably fast instruction.  */
#define MOVE_MAX 4

/* Define this if zero-extension is slow (more than one real instruction).  */
/* #define SLOW_ZERO_EXTEND */

/* Nonzero if access to memory by bytes is slow and undesirable.  */
#define SLOW_BYTE_ACCESS 0

/* Define this to be nonzero if shift instructions ignore all but the low-order
   few bits. */
#define SHIFT_COUNT_TRUNCATED 1

/* 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

/* We assume that the store-condition-codes instructions store 0 for false
   and some other value for true.  This is the value stored for true.  */

#define STORE_FLAG_VALUE -1

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

/* 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 SImode

/* A function address in a call instruction
   is a byte address (for indexing purposes)
   so give the MEM rtx a byte's mode.  */
#define FUNCTION_MODE QImode

/* Compute the cost of computing a constant rtl expression RTX
   whose rtx-code is CODE.  The body of this macro is a portion
   of a switch statement.  If the code is computed here,
   return it with a return statement.  Otherwise, break from the switch.  */

#define CONST_COSTS(RTX,CODE, OUTER_CODE)				\
  case CONST_INT:							\
    if (INTVAL (RTX) >= -16 && INTVAL (RTX) <= 63) return 0;		\
    if (INTVAL (RTX) >= -128 && INTVAL (RTX) <= 127) return 1;		\
    if (INTVAL (RTX) >= -32768 && INTVAL (RTX) <= 32767) return 2;	\
  case CONST:								\
  case LABEL_REF:							\
  case SYMBOL_REF:							\
    return 3;								\
  case CONST_DOUBLE:							\
    return 5;

/* Tell final.c how to eliminate redundant test instructions.  */

/* Here we define machine-dependent flags and fields in cc_status
   (see `conditions.h').  */