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/*{{{  Comment.  */

/* Definitions of FR30 target.

   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2007, 2008, 2009

   Free Software Foundation, Inc.

   Contributed by Cygnus Solutions.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 3, or (at your option)

any later version.

GCC is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

/*}}}*/ 

/*{{{  Driver configuration.  */

/* Defined in svr4.h.  */

#undef SWITCH_TAKES_ARG

/* Defined in svr4.h.  */

#undef WORD_SWITCH_TAKES_ARG

/*}}}*/ 

/*{{{  Run-time target specifications.  */

#undef  ASM_SPEC

#define ASM_SPEC "%{v}"

/* Define this to be a string constant containing `-D' options to define the

   predefined macros that identify this machine and system.  These macros will

   be predefined unless the `-ansi' option is specified.  */

#define TARGET_CPU_CPP_BUILTINS()               \

  do                                            \

    {                                           \

      builtin_define_std ("fr30");              \

      builtin_assert ("machine=fr30");          \

    }                                           \

   while (0)

#define TARGET_VERSION fprintf (stderr, " (fr30)");

#define CAN_DEBUG_WITHOUT_FP

#undef  STARTFILE_SPEC

#define STARTFILE_SPEC "crt0.o%s crti.o%s crtbegin.o%s"

/* Include the OS stub library, so that the code can be simulated.

   This is not the right way to do this.  Ideally this kind of thing

   should be done in the linker script - but I have not worked out how

   to specify the location of a linker script in a gcc command line yet... */

#undef  ENDFILE_SPEC

#define ENDFILE_SPEC  "%{!mno-lsim:-lsim} crtend.o%s crtn.o%s"

/*}}}*/ 

/*{{{  Storage Layout.  */

#define BITS_BIG_ENDIAN 1

#define BYTES_BIG_ENDIAN 1

#define WORDS_BIG_ENDIAN 1

#define UNITS_PER_WORD  4

#define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)       \

  do                                            \

    {                                           \

      if (GET_MODE_CLASS (MODE) == MODE_INT     \

          && GET_MODE_SIZE (MODE) < 4)          \

        (MODE) = SImode;                        \

    }                                           \

  while (0)

#define PARM_BOUNDARY 32

#define STACK_BOUNDARY 32

#define FUNCTION_BOUNDARY 32

#define BIGGEST_ALIGNMENT 32

#define DATA_ALIGNMENT(TYPE, ALIGN)             \

  (TREE_CODE (TYPE) == ARRAY_TYPE               \

   && TYPE_MODE (TREE_TYPE (TYPE)) == QImode    \

   && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))

#define CONSTANT_ALIGNMENT(EXP, ALIGN)  \

  (TREE_CODE (EXP) == STRING_CST        \

   && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))

#define STRICT_ALIGNMENT 1

/* Defined in svr4.h.  */

#define PCC_BITFIELD_TYPE_MATTERS 1

/*}}}*/ 

/*{{{  Layout of Source Language Data Types.  */

#define SHORT_TYPE_SIZE         16

#define INT_TYPE_SIZE           32

#define LONG_TYPE_SIZE          32

#define LONG_LONG_TYPE_SIZE     64

#define FLOAT_TYPE_SIZE         32

#define DOUBLE_TYPE_SIZE        64

#define LONG_DOUBLE_TYPE_SIZE   64

#define DEFAULT_SIGNED_CHAR 1

/*}}}*/ 

/*{{{  REGISTER BASICS.  */

/* Number of hardware registers known to the compiler.  They receive numbers 0

   through `FIRST_PSEUDO_REGISTER-1'; thus, the first pseudo register's number

   really is assigned the number `FIRST_PSEUDO_REGISTER'.  */

#define FIRST_PSEUDO_REGISTER   21

/* Fixed register assignments: */

/* Here we do a BAD THING - reserve a register for use by the machine

   description file.  There are too many places in compiler where it

   assumes that it can issue a branch or jump instruction without

   providing a scratch register for it, and reload just cannot cope, so

   we keep a register back for these situations.  */

#define COMPILER_SCRATCH_REGISTER 0

/* The register that contains the result of a function call.  */

#define RETURN_VALUE_REGNUM      4

/* The first register that can contain the arguments to a function.  */

#define FIRST_ARG_REGNUM         4

/* A call-used register that can be used during the function prologue.  */

#define PROLOGUE_TMP_REGNUM      COMPILER_SCRATCH_REGISTER

/* Register numbers used for passing a function's static chain pointer.  If

   register windows are used, the register number as seen by the called

   function is `STATIC_CHAIN_INCOMING_REGNUM', while the register number as

   seen by the calling function is `STATIC_CHAIN_REGNUM'.  If these registers

   are the same, `STATIC_CHAIN_INCOMING_REGNUM' need not be defined.

   The static chain register need not be a fixed register.

   If the static chain is passed in memory, these macros should not be defined;

   instead, the next two macros should be defined.  */

#define STATIC_CHAIN_REGNUM     12

/* #define STATIC_CHAIN_INCOMING_REGNUM */

/* An FR30 specific hardware register.  */

#define ACCUMULATOR_REGNUM      13

/* The register number of the frame pointer register, which is used to access

   automatic variables in the stack frame.  On some machines, the hardware

   determines which register this is.  On other machines, you can choose any

   register you wish for this purpose.  */

#define FRAME_POINTER_REGNUM    14

/* The register number of the stack pointer register, which must also be a

   fixed register according to `FIXED_REGISTERS'.  On most machines, the

   hardware determines which register this is.  */

#define STACK_POINTER_REGNUM    15

/* The following a fake hard registers that describe some of the dedicated

   registers on the FR30.  */

#define CONDITION_CODE_REGNUM   16

#define RETURN_POINTER_REGNUM   17

#define MD_HIGH_REGNUM          18

#define MD_LOW_REGNUM           19

/* An initializer that says which registers are used for fixed purposes all

   throughout the compiled code and are therefore not available for general

   allocation.  These would include the stack pointer, the frame pointer

   (except on machines where that can be used as a general register when no

   frame pointer is needed), the program counter on machines where that is

   considered one of the addressable registers, and any other numbered register

   with a standard use.

   This information is expressed as a sequence of numbers, separated by commas

   and surrounded by braces.  The Nth number is 1 if register N is fixed, 0

   otherwise.

   The table initialized from this macro, and the table initialized by the

   following one, may be overridden at run time either automatically, by the

   actions of the macro `CONDITIONAL_REGISTER_USAGE', or by the user with the

   command options `-ffixed-REG', `-fcall-used-REG' and `-fcall-saved-REG'.  */

#define FIXED_REGISTERS                         \

  { 1, 0, 0, 0, 0, 0, 0, 0,    /*  0 -  7 */   \

    0, 0, 0, 0, 0, 0, 0, 1,    /*  8 - 15 */   \

    1, 1, 1, 1, 1 }             /* 16 - 20 */

/* XXX - MDL and MDH set as fixed for now - this is until I can get the

   mul patterns working.  */

/* Like `FIXED_REGISTERS' but has 1 for each register that is clobbered (in

   general) by function calls as well as for fixed registers.  This macro

   therefore identifies the registers that are not available for general

   allocation of values that must live across function calls.

   If a register has 0 in `CALL_USED_REGISTERS', the compiler automatically

   saves it on function entry and restores it on function exit, if the register

   is used within the function.  */

#define CALL_USED_REGISTERS                     \

  { 1, 1, 1, 1, 1, 1, 1, 1,     /*  0 -  7 */   \

    0, 0, 0, 0, 1, 1, 0, 1,  /*  8 - 15 */   \

    1, 1, 1, 1, 1 }             /* 16 - 20 */

/* A C initializer containing the assembler's names for the machine registers,

   each one as a C string constant.  This is what translates register numbers

   in the compiler into assembler language.  */

#define REGISTER_NAMES                                          \

{   "r0", "r1", "r2",  "r3",  "r4",  "r5", "r6", "r7",  \

    "r8", "r9", "r10", "r11", "r12", "ac", "fp", "sp",  \

    "cc", "rp", "mdh", "mdl", "ap"                      \

}

/* If defined, a C initializer for an array of structures containing a name and

   a register number.  This macro defines additional names for hard registers,

   thus allowing the `asm' option in declarations to refer to registers using

   alternate names.  */

#define ADDITIONAL_REGISTER_NAMES                               \

{                                                               \

  {"r13", 13}, {"r14", 14}, {"r15", 15}, {"usp", 15}, {"ps", 16}\

}

/*}}}*/ 

/*{{{  How Values Fit in Registers.  */

/* A C expression for the number of consecutive hard registers, starting at

   register number REGNO, required to hold a value of mode MODE.  */

#define HARD_REGNO_NREGS(REGNO, MODE)                   \

  ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)

/* A C expression that is nonzero if it is permissible to store a value of mode

   MODE in hard register number REGNO (or in several registers starting with

   that one).  */

#define HARD_REGNO_MODE_OK(REGNO, MODE) 1

/* A C expression that is nonzero if it is desirable to choose register

   allocation so as to avoid move instructions between a value of mode MODE1

   and a value of mode MODE2.

   If `HARD_REGNO_MODE_OK (R, MODE1)' and `HARD_REGNO_MODE_OK (R, MODE2)' are

   ever different for any R, then `MODES_TIEABLE_P (MODE1, MODE2)' must be

   zero.  */

#define MODES_TIEABLE_P(MODE1, MODE2) 1

/*}}}*/ 

/*{{{  Register Classes.  */

/* An enumeral type that must be defined with all the register class names as

   enumeral values.  `NO_REGS' must be first.  `ALL_REGS' must be the last

   register class, followed by one more enumeral value, `LIM_REG_CLASSES',

   which is not a register class but rather tells how many classes there are.

   Each register class has a number, which is the value of casting the class

   name to type `int'.  The number serves as an index in many of the tables

   described below.  */

enum reg_class

{

  NO_REGS,

  MULTIPLY_32_REG,      /* the MDL register as used by the MULH, MULUH insns */

  MULTIPLY_64_REG,      /* the MDH,MDL register pair as used by MUL and MULU */

  LOW_REGS,             /* registers 0 through 7 */

  HIGH_REGS,            /* registers 8 through 15 */

  REAL_REGS,            /* i.e. all the general hardware registers on the FR30 */

  ALL_REGS,

  LIM_REG_CLASSES

};

#define GENERAL_REGS    REAL_REGS

#define N_REG_CLASSES   ((int) LIM_REG_CLASSES)

#define IRA_COVER_CLASSES                               \

{                                                       \

  REAL_REGS, MULTIPLY_64_REG, LIM_REG_CLASSES           \

}

/* An initializer containing the names of the register classes as C string

   constants.  These names are used in writing some of the debugging dumps.  */

#define REG_CLASS_NAMES \

{                       \

  "NO_REGS",            \

  "MULTIPLY_32_REG",    \

  "MULTIPLY_64_REG",    \

  "LOW_REGS",           \

  "HIGH_REGS",          \

  "REAL_REGS",          \

  "ALL_REGS"            \

 }

/* An initializer containing the contents of the register classes, as integers

   which are bit masks.  The Nth integer specifies the contents of class N.

   The way the integer MASK is interpreted is that register R is in the class

   if `MASK & (1 << R)' is 1.

   When the machine has more than 32 registers, an integer does not suffice.

   Then the integers are replaced by sub-initializers, braced groupings

   containing several integers.  Each sub-initializer must be suitable as an

   initializer for the type `HARD_REG_SET' which is defined in

   `hard-reg-set.h'.  */

#define REG_CLASS_CONTENTS                              \

{                                                       \

  { 0 },                                         \

  { 1 << MD_LOW_REGNUM },                               \

  { (1 << MD_LOW_REGNUM) | (1 << MD_HIGH_REGNUM) },     \

  { (1 << 8) - 1 },                                     \

  { ((1 << 8) - 1) << 8 },                              \

  { (1 << CONDITION_CODE_REGNUM) - 1 },                 \

  { (1 << FIRST_PSEUDO_REGISTER) - 1 }                  \

}

/* A C expression whose value is a register class containing hard register

   REGNO.  In general there is more than one such class; choose a class which

   is "minimal", meaning that no smaller class also contains the register.  */

#define REGNO_REG_CLASS(REGNO)                  \

  ( (REGNO) < 8 ? LOW_REGS                      \

  : (REGNO) < CONDITION_CODE_REGNUM ? HIGH_REGS \

  : (REGNO) == MD_LOW_REGNUM ? MULTIPLY_32_REG  \

  : (REGNO) == MD_HIGH_REGNUM ? MULTIPLY_64_REG \

  : ALL_REGS)

/* A macro whose definition is the name of the class to which a valid base

   register must belong.  A base register is one used in an address which is

   the register value plus a displacement.  */

#define BASE_REG_CLASS  REAL_REGS

/* A macro whose definition is the name of the class to which a valid index

   register must belong.  An index register is one used in an address where its

   value is either multiplied by a scale factor or added to another register

   (as well as added to a displacement).  */

#define INDEX_REG_CLASS REAL_REGS

/* A C expression which defines the machine-dependent operand constraint

   letters for register classes.  If CHAR is such a letter, the value should be

   the register class corresponding to it.  Otherwise, the value should be

   `NO_REGS'.  The register letter `r', corresponding to class `GENERAL_REGS',

   will not be passed to this macro; you do not need to handle it.

   The following letters are unavailable, due to being used as

   constraints:

        '0'..'9'

        '<', '>'

        'E', 'F', 'G', 'H'

        'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P'

        'Q', 'R', 'S', 'T', 'U'

        'V', 'X'

        'g', 'i', 'm', 'n', 'o', 'p', 'r', 's' */

#define REG_CLASS_FROM_LETTER(CHAR)     \

     (  (CHAR) == 'd' ? MULTIPLY_64_REG \

      : (CHAR) == 'e' ? MULTIPLY_32_REG \

      : (CHAR) == 'h' ? HIGH_REGS       \

      : (CHAR) == 'l' ? LOW_REGS        \

      : (CHAR) == 'a' ? ALL_REGS        \

      : NO_REGS)

/* A C expression which is nonzero if register number NUM is suitable for use

   as a base register in operand addresses.  It may be either a suitable hard

   register or a pseudo register that has been allocated such a hard register.  */

#define REGNO_OK_FOR_BASE_P(NUM) 1

/* A C expression which is nonzero if register number NUM is suitable for use

   as an index register in operand addresses.  It may be either a suitable hard

   register or a pseudo register that has been allocated such a hard register.

   The difference between an index register and a base register is that the

   index register may be scaled.  If an address involves the sum of two

   registers, neither one of them scaled, then either one may be labeled the

   "base" and the other the "index"; but whichever labeling is used must fit

   the machine's constraints of which registers may serve in each capacity.

   The compiler will try both labelings, looking for one that is valid, and

   will reload one or both registers only if neither labeling works.  */

#define REGNO_OK_FOR_INDEX_P(NUM) 1

/* A C expression that places additional restrictions on the register class to

   use when it is necessary to copy value X into a register in class CLASS.

   The value is a register class; perhaps CLASS, or perhaps another, smaller

   class.  On many machines, the following definition is safe:

        #define PREFERRED_RELOAD_CLASS(X,CLASS) CLASS

   Sometimes returning a more restrictive class makes better code.  For

   example, on the 68000, when X is an integer constant that is in range for a

   `moveq' instruction, the value of this macro is always `DATA_REGS' as long

   as CLASS includes the data registers.  Requiring a data register guarantees

   that a `moveq' will be used.

   If X is a `const_double', by returning `NO_REGS' you can force X into a

   memory constant.  This is useful on certain machines where immediate

   floating values cannot be loaded into certain kinds of registers.  */

#define PREFERRED_RELOAD_CLASS(X, CLASS) CLASS

/* A C expression for the maximum number of consecutive registers of

   class CLASS needed to hold a value of mode MODE.

   This is closely related to the macro `HARD_REGNO_NREGS'.  In fact, the value

   of the macro `CLASS_MAX_NREGS (CLASS, MODE)' should be the maximum value of

   `HARD_REGNO_NREGS (REGNO, MODE)' for all REGNO values in the class CLASS.

   This macro helps control the handling of multiple-word values in

   the reload pass.  */

#define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (0, MODE)

/*}}}*/ 

/*{{{  CONSTANTS.  */

/* A C expression that defines the machine-dependent operand constraint letters

   (`I', `J', `K', .. 'P') that specify particular ranges of integer values.

   If C is one of those letters, the expression should check that VALUE, an

   integer, is in the appropriate range and return 1 if so, 0 otherwise.  If C

   is not one of those letters, the value should be 0 regardless of VALUE.  */

#define CONST_OK_FOR_LETTER_P(VALUE, C)                         \

 (  (C) == 'I' ? IN_RANGE (VALUE,    0,       15)                \

  : (C) == 'J' ? IN_RANGE (VALUE,  -16,       -1)               \

  : (C) == 'K' ? IN_RANGE (VALUE,   16,       31)               \

  : (C) == 'L' ? IN_RANGE (VALUE,    0,       (1 <<  8) - 1)     \

  : (C) == 'M' ? IN_RANGE (VALUE,    0,       (1 << 20) - 1)     \

  : (C) == 'P' ? IN_RANGE (VALUE,  -(1 << 8), (1 <<  8) - 1)    \

  : 0)

/* A C expression that defines the machine-dependent operand constraint letters

   (`G', `H') that specify particular ranges of `const_double' values.

   If C is one of those letters, the expression should check that VALUE, an RTX

   of code `const_double', is in the appropriate range and return 1 if so, 0

   otherwise.  If C is not one of those letters, the value should be 0

   regardless of VALUE.

   `const_double' is used for all floating-point constants and for `DImode'

   fixed-point constants.  A given letter can accept either or both kinds of

   values.  It can use `GET_MODE' to distinguish between these kinds.  */

#define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) 0

/* A C expression that defines the optional machine-dependent constraint

   letters (`Q', `R', `S', `T', `U') that can be used to segregate specific

   types of operands, usually memory references, for the target machine.

   Normally this macro will not be defined.  If it is required for a particular

   target machine, it should return 1 if VALUE corresponds to the operand type

   represented by the constraint letter C.  If C is not defined as an extra

   constraint, the value returned should be 0 regardless of VALUE.

   For example, on the ROMP, load instructions cannot have their output in r0

   if the memory reference contains a symbolic address.  Constraint letter `Q'

   is defined as representing a memory address that does *not* contain a

   symbolic address.  An alternative is specified with a `Q' constraint on the

   input and `r' on the output.  The next alternative specifies `m' on the

   input and a register class that does not include r0 on the output.  */

#define EXTRA_CONSTRAINT(VALUE, C) \

   ((C) == 'Q' ? (GET_CODE (VALUE) == MEM && GET_CODE (XEXP (VALUE, 0)) == SYMBOL_REF) : 0)

/*}}}*/ 

/*{{{  Basic Stack Layout.  */

/* Define this macro if pushing a word onto the stack moves the stack pointer

   to a smaller address.  */

#define STACK_GROWS_DOWNWARD 1

/* Define this to macro nonzero if the addresses of local variable slots

   are at negative offsets from the frame pointer.  */

#define FRAME_GROWS_DOWNWARD 1

/* Offset from the frame pointer to the first local variable slot to be

   allocated.

   If `FRAME_GROWS_DOWNWARD', find the next slot's offset by subtracting the

   first slot's length from `STARTING_FRAME_OFFSET'.  Otherwise, it is found by

   adding the length of the first slot to the value `STARTING_FRAME_OFFSET'.  */

/* #define STARTING_FRAME_OFFSET -4 */

#define STARTING_FRAME_OFFSET 0

/* Offset from the stack pointer register to the first location at which

   outgoing arguments are placed.  If not specified, the default value of zero

   is used.  This is the proper value for most machines.

   If `ARGS_GROW_DOWNWARD', this is the offset to the location above the first

   location at which outgoing arguments are placed.  */

#define STACK_POINTER_OFFSET 0

/* Offset from the argument pointer register to the first argument's address.

   On some machines it may depend on the data type of the function.

   If `ARGS_GROW_DOWNWARD', this is the offset to the location above the first

   argument's address.  */

#define FIRST_PARM_OFFSET(FUNDECL) 0

/* A C expression whose value is RTL representing the location of the incoming

   return address at the beginning of any function, before the prologue.  This

   RTL is either a `REG', indicating that the return value is saved in `REG',

   or a `MEM' representing a location in the stack.

   You only need to define this macro if you want to support call frame

   debugging information like that provided by DWARF 2.  */

#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (SImode, RETURN_POINTER_REGNUM)

/*}}}*/ 

/*{{{  Register That Address the Stack Frame.  */

/* The register number of the arg pointer register, which is used to access the

   function's argument list.  On some machines, this is the same as the frame

   pointer register.  On some machines, the hardware determines which register

   this is.  On other machines, you can choose any register you wish for this

   purpose.  If this is not the same register as the frame pointer register,

   then you must mark it as a fixed register according to `FIXED_REGISTERS', or

   arrange to be able to eliminate it.  */

#define ARG_POINTER_REGNUM 20

/*}}}*/ 

/*{{{  Eliminating the Frame Pointer and the Arg Pointer.  */

/* 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.

   The definition of this macro is a list of structure initializations, each of

   which specifies an original and replacement register.

   On some machines, the position of the argument pointer is not known until

   the compilation is completed.  In such a case, a separate hard register must

   be used for the argument pointer.  This register can be eliminated by

   replacing it with either the frame pointer or the argument pointer,

   depending on whether or not the frame pointer has been eliminated.

   In this case, you might specify:

        #define ELIMINABLE_REGS  \

        {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \

         {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \

         {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}

   Note that the elimination of the argument pointer with the stack pointer is

   specified first since that is the preferred elimination.  */

#define ELIMINABLE_REGS                         \

{                                               \

  {ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM}, \

  {ARG_POINTER_REGNUM,   FRAME_POINTER_REGNUM}, \

  {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}  \

}

/* 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)                    \

     (OFFSET) = fr30_compute_frame_size (FROM, TO)

/*}}}*/ 

/*{{{  Passing Function Arguments on the Stack.  */

/* If defined, the maximum amount of space required for outgoing arguments will

   be computed and placed into the variable

   `crtl->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.

   Defining both `PUSH_ROUNDING' and `ACCUMULATE_OUTGOING_ARGS' is not

   proper.  */

#define ACCUMULATE_OUTGOING_ARGS 1

/* A C expression that should indicate the number of bytes of its own arguments

   that a function pops on returning, or 0 if the function pops no arguments

   and the caller must therefore pop them all after the function returns.

   FUNDECL is a C variable whose value is a tree node that describes the

   function in question.  Normally it is a node of type `FUNCTION_DECL' that

   describes the declaration of the function.  From this it is possible to

   obtain the DECL_ATTRIBUTES of the function.

   FUNTYPE is a C variable whose value is a tree node that describes the

   function in question.  Normally it is a node of type `FUNCTION_TYPE' that

   describes the data type of the function.  From this it is possible to obtain

   the data types of the value and arguments (if known).

   When a call to a library function is being considered, FUNTYPE will contain

   an identifier node for the library function.  Thus, if you need to

   distinguish among various library functions, you can do so by their names.

   Note that "library function" in this context means a function used to

   perform arithmetic, whose name is known specially in the compiler and was

   not mentioned in the C code being compiled.

   STACK-SIZE is the number of bytes of arguments passed on the stack.  If a

   variable number of bytes is passed, it is zero, and argument popping will

   always be the responsibility of the calling function.

   On the VAX, all functions always pop their arguments, so the definition of

   this macro is STACK-SIZE.  On the 68000, using the standard calling

   convention, no functions pop their arguments, so the value of the macro is

   always 0 in this case.  But an alternative calling convention is available

   in which functions that take a fixed number of arguments pop them but other

   functions (such as `printf') pop nothing (the caller pops all).  When this

   convention is in use, FUNTYPE is examined to determine whether a function

   takes a fixed number of arguments.  */

#define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACK_SIZE) 0

/*}}}*/ 

/*{{{  Function Arguments in Registers.  */

/* The number of register assigned to holding function arguments.  */

#define FR30_NUM_ARG_REGS        4

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

  (  (NAMED) == 0                    ? NULL_RTX                  \

   : targetm.calls.must_pass_in_stack (MODE, TYPE) ? NULL_RTX   \

   : (CUM) >= FR30_NUM_ARG_REGS      ? NULL_RTX                 \

   : gen_rtx_REG (MODE, CUM + FIRST_ARG_REGNUM))

/* A C type for declaring a variable that is used as the first argument of

   `FUNCTION_ARG' and other related values.  For some target machines, the type

   `int' suffices and can hold the number of bytes of argument so far.

   There is no need to record in `CUMULATIVE_ARGS' anything about the arguments

   that have been passed on the stack.  The compiler has other variables to

   keep track of that.  For target machines on which all arguments are passed

   on the stack, there is no need to store anything in `CUMULATIVE_ARGS';

   however, the data structure must exist and should not be empty, so use

   `int'.  */

/* On the FR30 this value is an accumulating count of the number of argument

   registers that have been filled with argument values, as opposed to say,

   the number of bytes of argument accumulated so far.  */

#define CUMULATIVE_ARGS int

/* A C statement (sans semicolon) for initializing the variable CUM for the

   state at the beginning of the argument list.  The variable has type

   `CUMULATIVE_ARGS'.  The value of FNTYPE is the tree node for the data type

   of the function which will receive the args, or 0 if the args are to a

   compiler support library function.  The value of INDIRECT is nonzero when

   processing an indirect call, for example a call through a function pointer.

   The value of INDIRECT is zero for a call to an explicitly named function, a

   library function call, or when `INIT_CUMULATIVE_ARGS' is used to find

   arguments for the function being compiled.

   When processing a call to a compiler support library function, LIBNAME

   identifies which one.  It is a `symbol_ref' rtx which contains the name of

   the function, as a string.  LIBNAME is 0 when an ordinary C function call is

   being processed.  Thus, each time this macro is called, either LIBNAME or

   FNTYPE is nonzero, but never both of them at once.  */

#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \

  (CUM) = 0

/* A C statement (sans semicolon) to update the summarizer variable CUM to

   advance past an argument in the argument list.  The values MODE, TYPE and

   NAMED describe that argument.  Once this is done, the variable CUM is

   suitable for analyzing the *following* argument with `FUNCTION_ARG', etc.

   This macro need not do anything if the argument in question was passed on

   the stack.  The compiler knows how to track the amount of stack space used

   for arguments without any special help.  */

#define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)                    \

  (CUM) += (NAMED) * fr30_num_arg_regs (MODE, TYPE)

/* A C expression that is nonzero if REGNO is the number of a hard register in

   which function arguments are sometimes passed.  This does *not* include

   implicit arguments such as the static chain and the structure-value address.

   On many machines, no registers can be used for this purpose since all

   function arguments are pushed on the stack.  */

#define FUNCTION_ARG_REGNO_P(REGNO) \

  ((REGNO) >= FIRST_ARG_REGNUM && ((REGNO) < FIRST_ARG_REGNUM + FR30_NUM_ARG_REGS))

/*}}}*/ 

/*{{{  How Scalar Function Values are Returned.  */

#define FUNCTION_VALUE(VALTYPE, FUNC) \

     gen_rtx_REG (TYPE_MODE (VALTYPE), RETURN_VALUE_REGNUM)

/* A C expression to create an RTX representing the place where a library

   function returns a value of mode MODE.  If the precise function being called

   is known, FUNC is a tree node (`FUNCTION_DECL') for it; otherwise, FUNC is a

   null pointer.  This makes it possible to use a different value-returning

   convention for specific functions when all their calls are known.

   Note that "library function" in this context means a compiler support

   routine, used to perform arithmetic, whose name is known specially by the

   compiler and was not mentioned in the C code being compiled.

   The definition of `LIBRARY_VALUE' need not be concerned aggregate data

   types, because none of the library functions returns such types.  */

#define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, RETURN_VALUE_REGNUM)

/* A C expression that is nonzero if REGNO is the number of a hard register in

   which the values of called function may come back.  */

#define FUNCTION_VALUE_REGNO_P(REGNO) ((REGNO) == RETURN_VALUE_REGNUM)

/*}}}*/ 

/*{{{  How Large Values are Returned.  */

/* Define this macro to be 1 if all structure and union return values must be

   in memory.  Since this results in slower code, this should be defined only

   if needed for compatibility with other compilers or with an ABI.  If you

   define this macro to be 0, then the conventions used for structure and union

   return values are decided by the `TARGET_RETURN_IN_MEMORY' macro.

   If not defined, this defaults to the value 1.  */

#define DEFAULT_PCC_STRUCT_RETURN 1

/*}}}*/ 

/*{{{  Generating Code for Profiling.  */

/* A C statement or compound statement to output to FILE some assembler code to

   call the profiling subroutine `mcount'.  Before calling, the assembler code

   must load the address of a counter variable into a register where `mcount'

   expects to find the address.  The name of this variable is `LP' followed by

   the number LABELNO, so you would generate the name using `LP%d' in a

   `fprintf'.

   The details of how the address should be passed to `mcount' are determined

   by your operating system environment, not by GCC.  To figure them out,

   compile a small program for profiling using the system's installed C

   compiler and look at the assembler code that results.  */

#define FUNCTION_PROFILER(FILE, LABELNO)        \

{                                               \

  fprintf (FILE, "\t mov rp, r1\n" );           \

  fprintf (FILE, "\t ldi:32 mcount, r0\n" );    \

  fprintf (FILE, "\t call @r0\n" );             \

  fprintf (FILE, ".word\tLP%d\n", LABELNO);     \

}

/*}}}*/ 

/*{{{  Trampolines for Nested Functions.  */

/* A C expression for the size in bytes of the trampoline, as an integer.  */

#define TRAMPOLINE_SIZE 18

/* We want the trampoline to be aligned on a 32bit boundary so that we can

   make sure the location of the static chain & target function within

   the trampoline is also aligned on a 32bit boundary.  */

#define TRAMPOLINE_ALIGNMENT 32

/*}}}*/ 

/*{{{  Addressing Modes.  */

/* A number, the maximum number of registers that can appear in a valid memory

   address.  Note that it is up to you to specify a value equal to the maximum

   number that `GO_IF_LEGITIMATE_ADDRESS' would ever accept.  */

#define MAX_REGS_PER_ADDRESS 1

/* A C compound statement with a conditional `goto LABEL;' executed if X (an

   RTX) is a legitimate memory address on the target machine for a memory

   operand of mode MODE.  */

/* On the FR30 we only have one real addressing mode - an address in a

   register.  There are three special cases however:

   * indexed addressing using small positive offsets from the stack pointer

   * indexed addressing using small signed offsets from the frame pointer

   * register plus register addressing using R13 as the base register.

   At the moment we only support the first two of these special cases.  */

#ifdef REG_OK_STRICT

#define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL)                        \

  do                                                                    \

    {                                                                   \

      if (GET_CODE (X) == REG && REG_OK_FOR_BASE_P (X))                 \

        goto LABEL;                                                     \

      if (GET_CODE (X) == PLUS                                          \

          && ((MODE) == SImode || (MODE) == SFmode)                     \

          && GET_CODE (XEXP (X, 0)) == REG                               \

          && REGNO (XEXP (X, 0)) == STACK_POINTER_REGNUM         \

          && GET_CODE (XEXP (X, 1)) == CONST_INT                        \

          && IN_RANGE (INTVAL (XEXP (X, 1)), 0, (1 <<  6) - 4))          \

        goto LABEL;                                                     \

      if (GET_CODE (X) == PLUS                                          \

          && ((MODE) == SImode || (MODE) == SFmode)                     \

          && GET_CODE (XEXP (X, 0)) == REG                               \

          && REGNO (XEXP (X, 0)) == FRAME_POINTER_REGNUM         \

          && GET_CODE (XEXP (X, 1)) == CONST_INT                        \

          && IN_RANGE (INTVAL (XEXP (X, 1)), -(1 << 9), (1 <<  9) - 4)) \

        goto LABEL;                                                     \

    }                                                                   \

  while (0)

#else

#define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL)                        \

  do                                                                    \

    {                                                                   \

      if (GET_CODE (X) == REG && REG_OK_FOR_BASE_P (X))                 \

        goto LABEL;                                                     \

      if (GET_CODE (X) == PLUS                                          \

          && ((MODE) == SImode || (MODE) == SFmode)                     \

          && GET_CODE (XEXP (X, 0)) == REG                               \

          && REGNO (XEXP (X, 0)) == STACK_POINTER_REGNUM         \