osprey/kg++fe/gnu/config/a29k/a29k.h

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/* Definitions of target machine for GNU compiler, for AMD Am29000 CPU.
   Copyright (C) 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   2000, 2001, 2002 Free Software Foundation, Inc.
   Contributed by Richard Kenner (kenner@nyu.edu)

This file is part of GNU CC.

GNU CC 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 2, or (at your option)
any later version.

GNU CC 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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */


/* Names to predefine in the preprocessor for this target machine.  */

#define CPP_PREDEFINES "-D_AM29K -D_AM29000 -D_EPI -Acpu=a29k -Amachine=a29k"

/* Print subsidiary information on the compiler version in use.  */
#define TARGET_VERSION

/* Pass -w to assembler.  */
#define ASM_SPEC "-w"

/* Run-time compilation parameters selecting different hardware subsets.  */

extern int target_flags;

/* Macro to define tables used to set the flags.
   This is a list in braces of pairs in braces,
   each pair being { "NAME", VALUE }
   where VALUE is the bits to set or minus the bits to clear.
   An empty string NAME is used to identify the default VALUE.  */

/* This means that the DW bit will be enabled, to allow direct loads
   of bytes.  */

#define TARGET_DW_ENABLE  (target_flags & 1)

/* This means that the external hardware does supports byte writes.  */

#define TARGET_BYTE_WRITES  (target_flags & 2)

/* This means that a "small memory model" has been selected where all
   function addresses are known to be within 256K.  This allows CALL to be
   used.  */

#define TARGET_SMALL_MEMORY (target_flags & 4)

/* This means that we must always used on indirect call, even when
   calling a function in the same file, since the file might be > 256KB.  */

#define TARGET_LARGE_MEMORY (target_flags & 8)

/* This means that we are compiling for a 29050.  */

#define TARGET_29050    (target_flags & 16)

/* This means that we are compiling for the kernel which means that we use
   gr64-gr95 instead of gr96-126.  */

#define TARGET_KERNEL_REGISTERS (target_flags & 32)

/* This means that a call to "__msp_check" should be inserted after each stack
   adjustment to check for stack overflow.  */

#define TARGET_STACK_CHECK  (target_flags & 64)

/* This handles 29k processors which cannot handle the separation
   of a mtsrim insns and a storem insn (most 29000 chips to date, but
   not the 29050.  */

#define TARGET_NO_STOREM_BUG  (target_flags & 128)

/* This forces the compiler not to use incoming argument registers except
   for copying out arguments.  It helps detect problems when a function is
   called with fewer arguments than it is declared with.  */

#define TARGET_NO_REUSE_ARGS  (target_flags & 256)

/* This means that neither builtin nor emulated float operations are
   available, and that GCC should generate libcalls instead.  */

#define TARGET_SOFT_FLOAT (target_flags & 512)

/* This means that we should not emit the multm or mutmu instructions
   that some embedded systems' trap handlers don't support.  */

#define TARGET_MULTM    ((target_flags & 1024) == 0)

#define TARGET_SWITCHES     \
  { {"dw", 1, N_("Generate code assuming DW bit is set")},    \
    {"ndw", -1, N_("Generate code assuming DW bit is not set")},  \
    {"bw", 2, N_("Generate code using byte writes")},     \
    {"nbw", - (1|2), N_("Do not generate byte writes")},    \
    {"small", 4, N_("Use small memory model")},       \
    {"normal", - (4|8), N_("Use normal memory model")},     \
    {"large", 8, N_("Use large memory model")},       \
    {"29050", 16+128, N_("Generate 29050 code")},     \
    {"29000", -16, N_("Generate 29000 code")},        \
    {"kernel-registers", 32, N_("Use kernel global registers")},  \
    {"user-registers", -32, N_("Use user global registers")},   \
    {"stack-check", 64, N_("Emit stack checking code")},    \
    {"no-stack-check", - 74, N_("Do not emit stack checking code")},  \
    {"storem-bug", -128, N_("Work around storem hardware bug")},  \
    {"no-storem-bug", 128, N_("Do not work around storem hardware bug")}, \
    {"reuse-arg-regs", -256, N_("Store locals in argument registers")},   \
    {"no-reuse-arg-regs", 256, N_("Do not store locals in arg registers")}, \
    {"soft-float", 512, N_("Use software floating point")},     \
    {"no-multm", 1024, N_("Do not generate multm instructions")},   \
    {"", TARGET_DEFAULT, NULL}}

#define TARGET_DEFAULT 3

/* Show we can debug even without a frame pointer.  */
#define CAN_DEBUG_WITHOUT_FP

/* target machine storage layout */

/* Define the types for size_t, ptrdiff_t, and wchar_t.  These are the
   same as those used by EPI.  The type for wchar_t does not make much
   sense, but is what is used.  */

#define SIZE_TYPE "unsigned int"
#define PTRDIFF_TYPE "int"
#define WCHAR_TYPE "char"
#define WCHAR_TYPE_SIZE BITS_PER_UNIT

/* Define this macro if it is advisable to hold scalars in registers
   in a wider mode than that declared by the program.  In such cases, 
   the value is constrained to be within the bounds of the declared
   type, but kept valid in the wider mode.  The signedness of the
   extension may differ from that of the type.  */

#define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)  \
  if (GET_MODE_CLASS (MODE) == MODE_INT \
      && GET_MODE_SIZE (MODE) < 4)    \
    (MODE) = SImode;

/* Define this if most significant bit is lowest numbered
   in instructions that operate on numbered bit-fields.
   This is arbitrary on the 29k since it has no actual bit-field insns.
   It is better to define this as TRUE because BYTES_BIG_ENDIAN is TRUE
   and we want to be able to convert BP position to bit position with
   just a shift.  */
#define BITS_BIG_ENDIAN 1

/* Define this if most significant byte of a word is the lowest numbered.
   This is true on 29k.  */
#define BYTES_BIG_ENDIAN 1

/* Define this if most significant word of a multiword number is lowest
   numbered. 

   For 29k we can decide arbitrarily since there are no machine instructions
   for them.  Might as well be consistent with bytes.  */
#define WORDS_BIG_ENDIAN 1

/* number of bits in an addressable storage unit */
#define BITS_PER_UNIT 8

/* Width in bits of a "word", which is the contents of a machine register.
   Note that this is not necessarily the width of data type `int';
   if using 16-bit ints on a 68000, this would still be 32.
   But on a machine with 16-bit registers, this would be 16.  */
#define BITS_PER_WORD 32

/* Width of a word, in units (bytes).  */
#define UNITS_PER_WORD 4

/* Width in bits of a pointer.
   See also the macro `Pmode' defined below.  */
#define POINTER_SIZE 32

/* Allocation boundary (in *bits*) for storing arguments in argument list.  */
#define PARM_BOUNDARY 32

/* Boundary (in *bits*) on which stack pointer should be aligned.  */
#define STACK_BOUNDARY 64

/* Allocation boundary (in *bits*) for the code of a function.  */
#define FUNCTION_BOUNDARY 32

/* Alignment of field after `int : 0' in a structure.  */
#define EMPTY_FIELD_BOUNDARY 32

/* Every structure's size must be a multiple of this.  */
#define STRUCTURE_SIZE_BOUNDARY 8

/* A bitfield declared as `int' forces `int' alignment for the struct.  */
#define PCC_BITFIELD_TYPE_MATTERS 1

/* No data type wants to be aligned rounder than this.  */
#define BIGGEST_ALIGNMENT 32

/* Make strings word-aligned so strcpy from constants will be faster.  */
#define CONSTANT_ALIGNMENT(EXP, ALIGN)  \
  (TREE_CODE (EXP) == STRING_CST  \
   && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))

/* Make arrays of chars word-aligned for the same reasons.  */
#define DATA_ALIGNMENT(TYPE, ALIGN)   \
  (TREE_CODE (TYPE) == ARRAY_TYPE   \
   && TYPE_MODE (TREE_TYPE (TYPE)) == QImode  \
   && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))

/* Set this non-zero if move instructions will actually fail to work
   when given unaligned data.  */
#define STRICT_ALIGNMENT 0

/* Set this non-zero if unaligned move instructions are extremely slow.

   On the 29k, they trap.  */
#define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) 1

/* Standard register usage.  */

/* Number of actual hardware registers.
   The hardware registers are assigned numbers for the compiler
   from 0 to just below FIRST_PSEUDO_REGISTER.
   All registers that the compiler knows about must be given numbers,
   even those that are not normally considered general registers.

   29k has 256 registers, of which 62 are not defined.  gr0 and gr1 are
   not produced in generated RTL so we can start at gr96, and call it
   register zero.

   So 0-31 are gr96-gr127, lr0-lr127 are 32-159.  To represent the input
   arguments, whose register numbers we won't know until we are done,
   use register 160-175.  They cannot be modified.  Similarly, 176 is used
   for the frame pointer.  It is assigned the last local register number
   once the number of registers used is known.

   We use 177, 178, 179, and 180 for the special registers BP, FC, CR, and Q,
   respectively.  Registers 181 through 199 are used for the other special
   registers that may be used by the programmer, but are never used by the
   compiler.

   Registers 200-203 are the four floating-point accumulator register in
   the 29050.

   Registers 204-235 are the 32 global registers for kernel mode when
   -mkernel-registers is not specified, and the 32 global user registers
   when it is.

   When -mkernel-registers is specified, we still use the same register
   map but change the names so 0-31 print as gr64-gr95.  */

#define FIRST_PSEUDO_REGISTER 236

/* Because of the large number of registers on the 29k, we define macros
   to refer to each group of registers and then define the number for some
   registers used in the calling sequence.  */

#define R_GR(N)   ((N) - 96)  /* gr96 is register number 0 */
#define R_LR(N)   ((N) + 32)  /* lr0 is register number 32 */
#define R_FP    176   /* frame pointer is register 176 */
#define R_AR(N)   ((N) + 160) /* first incoming arg reg is 160 */
#define R_KR(N)   ((N) + 204) /* kernel registers (gr64 to gr95) */

/* Define the numbers of the special registers.  */
#define R_BP  177
#define R_FC  178
#define R_CR  179
#define R_Q 180

/* These special registers are not used by the compiler, but may be referenced
   by the programmer via asm declarations.  */

#define R_VAB 181
#define R_OPS 182
#define R_CPS 183
#define R_CFG 184
#define R_CHA 185
#define R_CHD 186
#define R_CHC 187
#define R_RBP 188
#define R_TMC 189
#define R_TMR 190
#define R_PC0 191
#define R_PC1 192
#define R_PC2 193
#define R_MMU 194
#define R_LRU 195
#define R_FPE 196
#define R_INT 197
#define R_FPS 198
#define R_EXO 199

/* Define the number for floating-point accumulator N.  */
#define R_ACU(N)  ((N) + 200)

/* Now define the registers used in the calling sequence.  */
#define R_TAV R_GR (121)
#define R_TPC R_GR (122)
#define R_LRP R_GR (123)
#define R_SLP R_GR (124)
#define R_MSP R_GR (125)
#define R_RAB R_GR (126)
#define R_RFB R_GR (127)

/* 1 for registers that have pervasive standard uses
   and are not available for the register allocator.  */

#define FIXED_REGISTERS  \
 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, \
  0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  1, 1, 1, 1, 1, 1, 1, 1,       \
  0, 0, 0, 0,           \
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }

/* 1 for registers not available across function calls.
   These must include the FIXED_REGISTERS and also any
   registers that can be used without being saved.
   The latter must include the registers where values are returned
   and the register where structure-value addresses are passed.
   Aside from that, you can include as many other registers as you like.  */
#define CALL_USED_REGISTERS  \
 {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  1, 1, 1, 1, 1, 1, 1, 1,       \
  1, 1, 1, 1,           \
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }

/* List the order in which to allocate registers.  Each register must be
   listed once, even those in FIXED_REGISTERS.

   We allocate in the following order:
  gr116-gr120 (not used for anything but temps)
  gr96-gr111  (function return values, reverse order)
  argument registers (160-175)
  lr0-lr127 (locals, saved)
        acc3-0    (acc0 special)
  everything else  */

#define REG_ALLOC_ORDER   \
  {R_GR (116), R_GR (117), R_GR (118), R_GR (119), R_GR (120),    \
   R_GR (111), R_GR (110), R_GR (109), R_GR (108), R_GR (107),    \
   R_GR (106), R_GR (105), R_GR (104), R_GR (103), R_GR (102),    \
   R_GR (101), R_GR (100), R_GR (99), R_GR (98), R_GR (97), R_GR (96),  \
   R_AR (0), R_AR (1), R_AR (2), R_AR (3), R_AR (4), R_AR (5),    \
   R_AR (6), R_AR (7), R_AR (8), R_AR (9), R_AR (10), R_AR (11),  \
   R_AR (12), R_AR (13), R_AR (14), R_AR (15),        \
   R_LR (0), R_LR (1), R_LR (2), R_LR (3), R_LR (4), R_LR (5),    \
   R_LR (6), R_LR (7), R_LR (8), R_LR (9), R_LR (10), R_LR (11),  \
   R_LR (12), R_LR (13), R_LR (14), R_LR (15), R_LR (16), R_LR (17),  \
   R_LR (18), R_LR (19), R_LR (20), R_LR (21), R_LR (22), R_LR (23),  \
   R_LR (24), R_LR (25), R_LR (26), R_LR (27), R_LR (28), R_LR (29),  \
   R_LR (30), R_LR (31), R_LR (32), R_LR (33), R_LR (34), R_LR (35),  \
   R_LR (36), R_LR (37), R_LR (38), R_LR (39), R_LR (40), R_LR (41),  \
   R_LR (42), R_LR (43), R_LR (44), R_LR (45), R_LR (46), R_LR (47),  \
   R_LR (48), R_LR (49), R_LR (50), R_LR (51), R_LR (52), R_LR (53),  \
   R_LR (54), R_LR (55), R_LR (56), R_LR (57), R_LR (58), R_LR (59),  \
   R_LR (60), R_LR (61), R_LR (62), R_LR (63), R_LR (64), R_LR (65),  \
   R_LR (66), R_LR (67), R_LR (68), R_LR (69), R_LR (70), R_LR (71),  \
   R_LR (72), R_LR (73), R_LR (74), R_LR (75), R_LR (76), R_LR (77),  \
   R_LR (78), R_LR (79), R_LR (80), R_LR (81), R_LR (82), R_LR (83),  \
   R_LR (84), R_LR (85), R_LR (86), R_LR (87), R_LR (88), R_LR (89),  \
   R_LR (90), R_LR (91), R_LR (92), R_LR (93), R_LR (94), R_LR (95),  \
   R_LR (96), R_LR (97), R_LR (98), R_LR (99), R_LR (100), R_LR (101),  \
   R_LR (102), R_LR (103), R_LR (104), R_LR (105), R_LR (106),    \
   R_LR (107), R_LR (108), R_LR (109), R_LR (110), R_LR (111),    \
   R_LR (112), R_LR (113), R_LR (114), R_LR (115), R_LR (116),    \
   R_LR (117), R_LR (118), R_LR (119), R_LR (120), R_LR (121),    \
   R_LR (122), R_LR (123), R_LR (124), R_LR (124), R_LR (126),    \
   R_LR (127),                \
   R_ACU (3), R_ACU (2), R_ACU (1), R_ACU (0),        \
   R_GR (112), R_GR (113), R_GR (114), R_GR (115), R_GR (121),    \
   R_GR (122), R_GR (123), R_GR (124), R_GR (125), R_GR (126),    \
   R_GR (127),                \
   R_FP, R_BP, R_FC, R_CR, R_Q,           \
   R_VAB, R_OPS, R_CPS, R_CFG, R_CHA, R_CHD, R_CHC, R_RBP, R_TMC, \
   R_TMR, R_PC0, R_PC1, R_PC2, R_MMU, R_LRU, R_FPE, R_INT, R_FPS, \
   R_EXO,               \
   R_KR (0), R_KR (1), R_KR (2), R_KR (3), R_KR (4), R_KR (5),    \
   R_KR (6), R_KR (7), R_KR (8), R_KR (9), R_KR (10), R_KR (11),  \
   R_KR (12), R_KR (13), R_KR (14), R_KR (15), R_KR (16), R_KR (17),  \
   R_KR (18), R_KR (19), R_KR (20), R_KR (21), R_KR (22), R_KR (23),  \
   R_KR (24), R_KR (25), R_KR (26), R_KR (27), R_KR (28), R_KR (29),  \
   R_KR (30), R_KR (31) }

/* Return number of consecutive hard regs needed starting at reg REGNO
   to hold something of mode MODE.
   This is ordinarily the length in words of a value of mode MODE
   but can be less for certain modes in special long registers.  */

#define HARD_REGNO_NREGS(REGNO, MODE)   \
  ((REGNO) >= R_ACU (0) && (REGNO) <= R_ACU (3)? 1    \
   : (GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)

/* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
   On 29k, the cpu registers can hold any mode.  But a double-precision
   floating-point value should start at an even register.  The special
   registers cannot hold floating-point values, BP, CR, and FC cannot
   hold integer or floating-point values,  and the accumulators cannot
   hold integer values.

   DImode and larger values should start at an even register just like
   DFmode values, even though the instruction set doesn't require it, in order
   to prevent reload from aborting due to a modes_equiv_for_class_p failure.

   (I'd like to use the "?:" syntax to make this more readable, but Sun's
   compiler doesn't seem to accept it.)  */
#define HARD_REGNO_MODE_OK(REGNO, MODE)         \
(((REGNO) >= R_ACU (0) && (REGNO) <= R_ACU (3)        \
    && (GET_MODE_CLASS (MODE) == MODE_FLOAT       \
  || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT))    \
   || ((REGNO) >= R_BP && (REGNO) <= R_CR       \
       && GET_MODE_CLASS (MODE) == MODE_PARTIAL_INT)      \
   || ((REGNO) >= R_Q && (REGNO) < R_ACU (0)        \
       && GET_MODE_CLASS (MODE) != MODE_FLOAT       \
       && GET_MODE_CLASS (MODE) != MODE_COMPLEX_FLOAT)      \
   || (((REGNO) < R_BP || (REGNO) >= R_KR (0))         \
       && ((((REGNO) & 1) == 0)           \
     || GET_MODE_UNIT_SIZE (MODE) <= UNITS_PER_WORD)))

/* Value is 1 if it is a good idea to tie two pseudo registers
   when one has mode MODE1 and one has mode MODE2.
   If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
   for any hard reg, then this must be 0 for correct output.

   On the 29k, normally we'd just have problems with DFmode because of the
   even alignment.  However, we also have to be a bit concerned about
   the special register's restriction to non-floating and the floating-point
   accumulator's restriction to only floating.  This probably won't
   cause any great inefficiencies in practice.  */

#define MODES_TIEABLE_P(MODE1, MODE2)     \
  ((MODE1) == (MODE2)         \
   || (GET_MODE_CLASS (MODE1) == MODE_INT   \
       && GET_MODE_CLASS (MODE2) == MODE_INT))

/* Specify the registers used for certain standard purposes.
   The values of these macros are register numbers.  */

/* 29k pc isn't overloaded on a register that the compiler knows about.  */
/* #define PC_REGNUM  */

/* Register to use for pushing function arguments.  */
#define STACK_POINTER_REGNUM R_GR (125)

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

/* Value should be nonzero if functions must have frame pointers.
   Zero means the frame pointer need not be set up (and parms
   may be accessed via the stack pointer) in functions that seem suitable.
   This is computed in `reload', in reload1.c.  */
#define FRAME_POINTER_REQUIRED 0

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

/* Register in which static-chain is passed to a function.  */
#define STATIC_CHAIN_REGNUM R_SLP

/* Register in which address to store a structure value
   is passed to a function.  */
#define STRUCT_VALUE_REGNUM R_LRP

/* Define the classes of registers for register constraints in the
   machine description.  Also define ranges of constants.

   One of the classes must always be named ALL_REGS and include all hard regs.
   If there is more than one class, another class must be named NO_REGS
   and contain no registers.

   The name GENERAL_REGS must be the name of a class (or an alias for
   another name such as ALL_REGS).  This is the class of registers
   that is allowed by "g" or "r" in a register constraint.
   Also, registers outside this class are allocated only when
   instructions express preferences for them.

   The classes must be numbered in nondecreasing order; that is,
   a larger-numbered class must never be contained completely
   in a smaller-numbered class.

   For any two classes, it is very desirable that there be another
   class that represents their union.
   
   The 29k has nine registers classes: LR0_REGS, GENERAL_REGS, SPECIAL_REGS,
   BP_REGS, FC_REGS, CR_REGS, Q_REGS, ACCUM_REGS, and ACCUM0_REGS.
   LR0_REGS, BP_REGS, FC_REGS, CR_REGS, and Q_REGS contain just the single
   register.  The latter two classes are used to represent the floating-point
   accumulator registers in the 29050.  We also define the union class
   FLOAT_REGS to represent any register that can be used to hold a
   floating-point value.  The union of SPECIAL_REGS and ACCUM_REGS isn't
   useful as the former cannot contain floating-point and the latter can only
   contain floating-point.  */

enum reg_class { NO_REGS, LR0_REGS, GENERAL_REGS, BP_REGS, FC_REGS, CR_REGS,
     Q_REGS, SPECIAL_REGS, ACCUM0_REGS, ACCUM_REGS, FLOAT_REGS,
     ALL_REGS, LIM_REG_CLASSES };

#define N_REG_CLASSES (int) LIM_REG_CLASSES

/* Give names of register classes as strings for dump file.  */

#define REG_CLASS_NAMES       \
 {"NO_REGS", "LR0_REGS", "GENERAL_REGS", "BP_REGS", "FC_REGS", "CR_REGS", \
  "Q_REGS", "SPECIAL_REGS", "ACCUM0_REGS", "ACCUM_REGS", "FLOAT_REGS",    \
  "ALL_REGS" }

/* Define which registers fit in which classes.
   This is an initializer for a vector of HARD_REG_SET
   of length N_REG_CLASSES.  */

#define REG_CLASS_CONTENTS  \
  { {0, 0, 0, 0, 0, 0, 0, 0},            \
    {0, 1, 0, 0, 0, 0, 0, 0},          \
    {~0, ~0, ~0, ~0, ~0, ~ 0xfffe0000, ~ 0xfff, 0xfff},    \
    {0, 0, 0, 0, 0, 0x20000, 0, 0},          \
    {0, 0, 0, 0, 0, 0x40000, 0, 0},          \
    {0, 0, 0, 0, 0, 0x80000, 0, 0},          \
    {0, 0, 0, 0, 0, 0x100000, 0, 0},         \
    {0, 0, 0, 0, 0, 0xfffe0000, 0xff, 0},      \
    {0, 0, 0, 0, 0, 0, 0x100, 0},        \
    {0, 0, 0, 0, 0, 0, 0xf00, 0},        \
    {~0, ~0, ~0, ~0, ~0, ~ 0xfffe0000, ~ 0xff, 0xfff},     \
    {~0, ~0, ~0, ~0, ~0, ~0, ~0, 0xfff} }

/* The same information, inverted:
   Return the class number of the smallest class containing
   reg number REGNO.  This could be a conditional expression
   or could index an array.  */

#define REGNO_REG_CLASS(REGNO)    \
  ((REGNO) == R_BP ? BP_REGS    \
   : (REGNO) == R_FC ? FC_REGS    \
   : (REGNO) == R_CR ? CR_REGS    \
   : (REGNO) == R_Q ? Q_REGS    \
   : (REGNO) > R_BP && (REGNO) <= R_EXO ? SPECIAL_REGS  \
   : (REGNO) == R_ACU (0) ? ACCUM0_REGS \
   : (REGNO) >= R_KR (0) ? GENERAL_REGS \
   : (REGNO) > R_ACU (0) ? ACCUM_REGS \
   : (REGNO) == R_LR (0) ? LR0_REGS \
   : GENERAL_REGS)

/* The class value for index registers, and the one for base regs.  */
#define INDEX_REG_CLASS NO_REGS
#define BASE_REG_CLASS GENERAL_REGS

/* Get reg_class from a letter such as appears in the machine description.  */

#define REG_CLASS_FROM_LETTER(C)  \
 ((C) == 'r' ? GENERAL_REGS   \
  : (C) == 'l' ? LR0_REGS   \
  : (C) == 'b' ? BP_REGS    \
  : (C) == 'f' ? FC_REGS    \
  : (C) == 'c' ? CR_REGS    \
  : (C) == 'q' ? Q_REGS     \
  : (C) == 'h' ? SPECIAL_REGS   \
  : (C) == 'a' ? ACCUM_REGS   \
  : (C) == 'A' ? ACCUM0_REGS    \
  : (C) == 'f' ? FLOAT_REGS   \
  : NO_REGS)

/* Define this macro to change register usage conditional on target flags.

   On the 29k, we use this to change the register names for kernel mapping.  */

#define CONDITIONAL_REGISTER_USAGE    \
  {           \
    const char *p;        \
    int i;          \
            \
    if (TARGET_KERNEL_REGISTERS)    \
      for (i = 0; i < 32; i++)      \
  {         \
    p = reg_names[i];     \
    reg_names[i] = reg_names[R_KR (i)]; \
    reg_names[R_KR (i)] = p;    \
  }         \
  }

/* The letters I, J, K, L, M, N, O, and P in a register constraint string
   can be used to stand for particular ranges of immediate operands.
   This macro defines what the ranges are.
   C is the letter, and VALUE is a constant value.
   Return 1 if VALUE is in the range specified by C.

   For 29k:
   `I' is used for the range of constants most insns can contain.
   `J' is for the few 16-bit insns.
   `K' is a constant whose high-order 24 bits are all one
   `L' is a HImode constant whose high-order 8 bits are all one
   `M' is a 32-bit constant whose high-order 16 bits are all one (for CONSTN)
   `N' is a 32-bit constant whose negative is 8 bits
   `O' is the 32-bit constant 0x80000000, any constant with low-order
          16 bits zero for 29050.
   `P' is a HImode constant whose negative is 8 bits  */

#define CONST_OK_FOR_LETTER_P(VALUE, C)       \
  ((C) == 'I' ? (unsigned) (VALUE) < 0x100      \
   : (C) == 'J' ? (unsigned) (VALUE) < 0x10000      \
   : (C) == 'K' ? ((VALUE) & 0xffffff00) == 0xffffff00    \
   : (C) == 'L' ? ((VALUE) & 0xff00) == 0xff00      \
   : (C) == 'M' ? ((VALUE) & 0xffff0000) == 0xffff0000    \
   : (C) == 'N' ? ((VALUE) < 0 && (VALUE) > -256)   \
   : (C) == 'O' ? ((VALUE) == 0x80000000      \
       || (TARGET_29050 && ((VALUE) & 0xffff) == 0)) \
   : (C) == 'P' ? (((VALUE) | 0xffff0000) < 0     \
       && ((VALUE) | 0xffff0000) > -256)    \
   : 0)

/* Similar, but for floating constants, and defining letters G and H.
   Here VALUE is the CONST_DOUBLE rtx itself.
   All floating-point constants are valid on 29k.  */

#define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)  1

/* Given an rtx X being reloaded into a reg required to be
   in class CLASS, return the class of reg to actually use.
   In general this is just CLASS; but on some machines
   in some cases it is preferable to use a more restrictive class.  */

#define PREFERRED_RELOAD_CLASS(X,CLASS) CLASS

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

#define SECONDARY_RELOAD_CLASS(CLASS,MODE,IN) \
  secondary_reload_class (CLASS, MODE, IN)

/* Return the maximum number of consecutive registers
   needed to represent mode MODE in a register of class CLASS.

   On 29k, this is the size of MODE in words except that the floating-point
   accumulators only require one word for anything they can hold.  */

#define CLASS_MAX_NREGS(CLASS, MODE)        \
 (((CLASS) == ACCUM_REGS || (CLASS) == ACCUM0_REGS) ? 1   \
  : (GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)

/* Define the cost of moving between registers of various classes.  Everything
   involving a general register is cheap, but moving between the other types
   (even within a class) is two insns.  */

#define REGISTER_MOVE_COST(MODE, CLASS1, CLASS2)  \
  ((CLASS1) == GENERAL_REGS || (CLASS2) == GENERAL_REGS ? 2 : 4)

/* A C expressions returning the cost of moving data of MODE from a register to
   or from memory.

   It takes extra insns on the 29k to form addresses, so we want to make
   this higher.  In addition, we need to keep it more expensive than the
   most expensive register-register copy.  */

#define MEMORY_MOVE_COST(MODE,CLASS,IN) 6

/* 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 (- current_function_pretend_args_size)

/* If we generate an insn to push BYTES bytes,
   this says how many the stack pointer really advances by.
   On 29k, don't define this because there are no push insns.  */
/*  #define PUSH_ROUNDING(BYTES) */

/* Define this if the maximum size of all the outgoing args is to be
   accumulated and pushed during the prologue.  The amount can be
   found in the variable current_function_outgoing_args_size.  */
#define ACCUMULATE_OUTGOING_ARGS 1

/* Offset of first parameter from the argument pointer register value.  */

#define FIRST_PARM_OFFSET(FNDECL) (- current_function_pretend_args_size)

/* Define this if stack space is still allocated for a parameter passed
   in a register.  */
/* #define REG_PARM_STACK_SPACE */

/* 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 29k the value is found in gr96.  */

#define FUNCTION_VALUE(VALTYPE, FUNC)  \
  gen_rtx_REG (TYPE_MODE (VALTYPE), R_GR (96))

/* 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, R_GR (96))

/* 1 if N is a possible register number for a function value
   as seen by the caller.
   On 29k, gr96-gr111 are used.  */

#define FUNCTION_VALUE_REGNO_P(N) ((N) == R_GR (96))

/* 1 if N is a possible register number for function argument passing.
   On 29k, these are lr2-lr17.  */

#define FUNCTION_ARG_REGNO_P(N) ((N) <= R_LR (17) && (N) >= R_LR (2))

/* 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 29k, this is a single integer, which is a number of words
   of arguments scanned so far.
   Thus 16 or more means all following args should go on the stack.  */

#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

/* Same, but called for incoming args.

   On the 29k, we use this to set all argument registers to fixed and
   set the last 16 local regs, less two, (lr110-lr125) to available.  Some
   will later be changed to call-saved by FUNCTION_INCOMING_ARG.
   lr126,lr127 are always fixed, they are place holders for the caller's
   lr0,lr1.  */

#define INIT_CUMULATIVE_INCOMING_ARGS(CUM,FNTYPE,IGNORE)  \
{ int i;              \
  for (i = R_AR (0) - 2; i < R_AR (16); i++)      \
    {               \
      fixed_regs[i] = call_used_regs[i] = call_fixed_regs[i] = 1; \
      SET_HARD_REG_BIT (fixed_reg_set, i);      \
      SET_HARD_REG_BIT (call_used_reg_set, i);      \
      SET_HARD_REG_BIT (call_fixed_reg_set, i);     \
    }               \
  for (i = R_LR (110); i < R_LR (126); i++)         \
    {               \
      fixed_regs[i] = call_used_regs[i] = call_fixed_regs[i] = 0; \
      CLEAR_HARD_REG_BIT (fixed_reg_set, i);      \
      CLEAR_HARD_REG_BIT (call_used_reg_set, i);    \
      CLEAR_HARD_REG_BIT (call_fixed_reg_set, i);   \
    }               \
  (CUM) = 0;              \
 }

/* Define intermediate macro to compute the size (in registers) of an argument
   for the 29k.  */

#define A29K_ARG_SIZE(MODE, TYPE, NAMED)        \
(! (NAMED) ? 0                \
 : (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)

/* 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)      \
  if (MUST_PASS_IN_STACK (MODE, TYPE))          \
    (CUM) = 16;               \
  else                  \
    (CUM) += A29K_ARG_SIZE (MODE, TYPE, NAMED)

/* 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 29k the first 16 words of args are normally in registers
   and the rest are pushed.  */

#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)      \
((CUM) < 16 && (NAMED) && ! MUST_PASS_IN_STACK (MODE, TYPE) \
 ? gen_rtx_REG ((MODE), R_LR (2) + (CUM)) : 0)

/* Define where a function finds its arguments.
   This is different from FUNCTION_ARG because of register windows.

   On the 29k, we hack this to call a function that sets the used registers
   as non-fixed and not used by calls.  */

#define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED)     \
((CUM) < 16 && (NAMED) && ! MUST_PASS_IN_STACK (MODE, TYPE)   \
 ? gen_rtx_REG (MODE,             \
    incoming_reg (CUM, A29K_ARG_SIZE (MODE, TYPE, NAMED)))  \
 : 0)

/* This indicates that an argument is to be passed with an invisible reference
   (i.e., a pointer to the object is passed).

   On the 29k, we do this if it must be passed on the stack.  */

#define FUNCTION_ARG_PASS_BY_REFERENCE(CUM, MODE, TYPE, NAMED)  \
  (MUST_PASS_IN_STACK (MODE, TYPE))

/* Specify the padding direction of arguments.

   On the 29k, we must pad upwards in order to be able to pass args in
   registers.  */

#define FUNCTION_ARG_PADDING(MODE, TYPE)  upward

/* 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)    \
((CUM) < 16 && 16 < (CUM) + A29K_ARG_SIZE (MODE, TYPE, NAMED) && (NAMED) \
 ? 16 - (CUM) : 0)

/* Perform any needed actions needed for a function that is receiving a
   variable number of arguments. 

   CUM is as above.

   MODE and TYPE are the mode and type of the current parameter.

   PRETEND_SIZE is a variable that should be set to the amount of stack
   that must be pushed by the prolog to pretend that our caller pushed
   it.

   Normally, this macro will push all remaining incoming registers on the
   stack and set PRETEND_SIZE to the length of the registers pushed.  */

#define SETUP_INCOMING_VARARGS(CUM,MODE,TYPE,PRETEND_SIZE,NO_RTL) \
{ if ((CUM) < 16)             \
    {                 \
      int first_reg_offset = (CUM);         \
                  \
      if (MUST_PASS_IN_STACK (MODE, TYPE))        \
  first_reg_offset += A29K_ARG_SIZE (TYPE_MODE (TYPE), TYPE, 1);  \
                  \
      if (first_reg_offset > 16)          \
  first_reg_offset = 16;            \
                  \
      if (! (NO_RTL) && first_reg_offset != 16)       \
  move_block_from_reg           \
    (R_AR (0) + first_reg_offset,         \
     gen_rtx_MEM (BLKmode, virtual_incoming_args_rtx),    \
     16 - first_reg_offset, (16 - first_reg_offset) * UNITS_PER_WORD); \
      PRETEND_SIZE = (16 - first_reg_offset) * UNITS_PER_WORD;    \
    }                 \
}

/* Define the information needed to generate branch and scc insns.  This is
   stored from the compare operation.  Note that we can't use "rtx" here
   since it hasn't been defined!  */

extern struct rtx_def *a29k_compare_op0, *a29k_compare_op1;
extern int a29k_compare_fp_p;

/* This macro produces the initial definition of a function name.

   For the 29k, we need the prolog to contain one or two words prior to
   the declaration of the function name.  So just store away the name and
   write it as part of the prolog.  This also computes the register names,
   which can't be done until after register allocation, but must be done
   before final_start_function is called.  */

extern const char *a29k_function_name;

#define ASM_DECLARE_FUNCTION_NAME(FILE,NAME,DECL) \
  a29k_function_name = NAME; \
  a29k_compute_reg_names ();

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

#define FUNCTION_PROFILER(FILE, LABELNO)

/* 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

/* Define the number of delay slots needed for the function epilogue.

   On the 29k, we need a slot except when we have a register stack adjustment,
   have a memory stack adjustment, and have no frame pointer.  */

#define DELAY_SLOTS_FOR_EPILOGUE          \
  (! (needs_regstack_p ()           \
      && (get_frame_size () + current_function_pretend_args_size  \
     + current_function_outgoing_args_size) != 0      \
      && ! frame_pointer_needed))

/* Define whether INSN can be placed in delay slot N for the epilogue.

   On the 29k, we must be able to place it in a delay slot, it must
   not use sp if the frame pointer cannot be eliminated, and it cannot
   use local regs if we need to push the register stack.
   If this is a SET with a memory as source, it might load from
   a stack slot, unless the address is constant.  */

#define ELIGIBLE_FOR_EPILOGUE_DELAY(INSN,N)       \
  (get_attr_in_delay_slot (INSN) == IN_DELAY_SLOT_YES     \
   && ! (frame_pointer_needed           \
   && reg_mentioned_p (stack_pointer_rtx, PATTERN (INSN)))  \
   && ! (needs_regstack_p () && uses_local_reg_p (PATTERN (INSN)))  \
   && (GET_CODE (PATTERN (INSN)) != SET         \
       || GET_CODE (SET_SRC (PATTERN (INSN))) != MEM      \
       || ! rtx_varies_p (XEXP (SET_SRC (PATTERN (INSN)), 0), 0)))

/* Output assembler code for a block containing the constant parts
   of a trampoline, leaving space for the variable parts.

   The trampoline should set the static chain pointer to value placed
   into the trampoline and should branch to the specified routine.  We
   use gr121 (tav) as a temporary.  */

#define TRAMPOLINE_TEMPLATE(FILE)     \
{             \
  fprintf (FILE, "\tconst %s,0\n", reg_names[R_TAV]); \
  fprintf (FILE, "\tconsth %s,0\n", reg_names[R_TAV]);  \
  fprintf (FILE, "\tconst %s,0\n", reg_names[R_SLP]); \
  fprintf (FILE, "\tjmpi %s\n", reg_names[R_TAV]);  \
  fprintf (FILE, "\tconsth %s,0\n", reg_names[R_SLP]);  \
}

/* 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.

   We do this on the 29k by writing the bytes of the addresses into the
   trampoline one byte at a time.  */

#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)     \
{                 \
  INITIALIZE_TRAMPOLINE_VALUE (TRAMP, FNADDR, 0, 4);      \
  INITIALIZE_TRAMPOLINE_VALUE (TRAMP, CXT, 8, 16);      \
}

/* Define a sub-macro to initialize one value into the trampoline.
   We specify the offsets of the CONST and CONSTH instructions, respectively
   and copy the value a byte at a time into these instructions.  */

#define INITIALIZE_TRAMPOLINE_VALUE(TRAMP, VALUE, CONST, CONSTH)  \
{                 \
  rtx _addr, _temp;             \
  rtx _val = force_reg (SImode, VALUE);         \
                  \
  _addr = memory_address (QImode, plus_constant (TRAMP, (CONST) + 3));  \
  emit_move_insn (gen_rtx_MEM (QImode, _addr),        \
      gen_lowpart (QImode, _val));        \
                  \
  _temp = expand_shift (RSHIFT_EXPR, SImode, _val,      \
           build_int_2 (8, 0), 0, 1);     \
  _addr = memory_address (QImode, plus_constant (TRAMP, (CONST) + 1));  \
  emit_move_insn (gen_rtx_MEM (QImode, _addr),        \
      gen_lowpart (QImode, _temp));       \
                  \
  _temp = expand_shift (RSHIFT_EXPR, SImode, _temp,     \
           build_int_2 (8, 0), _temp, 1);     \
  _addr = memory_address (QImode, plus_constant (TRAMP, (CONSTH) + 3)); \
  emit_move_insn (gen_rtx_MEM (QImode, _addr),        \
      gen_lowpart (QImode, _temp));       \
                  \
  _temp = expand_shift (RSHIFT_EXPR, SImode, _temp,     \
           build_int_2 (8, 0), _temp, 1);     \
  _addr = memory_address (QImode, plus_constant (TRAMP, (CONSTH) + 1)); \
  emit_move_insn (gen_rtx_MEM (QImode, _addr),        \
      gen_lowpart (QImode, _temp));       \
}

/* 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) 1

/* Given the value returned from get_frame_size, compute the actual size
   of the frame we will allocate.   We include the pretend and outgoing
   arg sizes and round to a doubleword.  */

#define ACTUAL_FRAME_SIZE(SIZE)       \
  (((SIZE) + current_function_pretend_args_size   \
    + current_function_outgoing_args_size + 7) & ~7)

/* Define the initial offset between the frame and stack pointer.  */

#define INITIAL_FRAME_POINTER_OFFSET(DEPTH) \
  (DEPTH) = ACTUAL_FRAME_SIZE (get_frame_size ())

/* 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) == CONST_INT && (unsigned) INTVAL (X) < 0x100)

/* Include all constant integers and constant doubles */
#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)  1

#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.

   On the 29k, a legitimate address is a register and so is a
   constant of less than 256.  */

#define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR)  \
{ if (REG_P (X) && REG_OK_FOR_BASE_P (X)) \
    goto ADDR;          \
  if (GET_CODE (X) == CONST_INT     \
      && (unsigned) INTVAL (X) < 0x100)   \
    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 29k, we need not do anything.  However, if we don't,
   `memory_address' will try lots of things to get a valid address, most of
   which will result in dead code and extra pseudos.  So we make the address
   valid here.

   This is easy:  The only valid addresses are an offset from a register
   and we know the address isn't valid.  So just call either `force_operand'
   or `force_reg' unless this is a (plus (reg ...) (const_int 0)).  */

#define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN)     \
{ if (GET_CODE (X) == PLUS && XEXP (X, 1) == const0_rtx)  \
    X = XEXP (x, 0);            \
  if (GET_CODE (X) == MULT || GET_CODE (X) == PLUS)   \
    X = force_operand (X, 0);         \
  else                \
    X = force_reg (Pmode, X);         \
  goto 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 29k this is never true.  */

#define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL)

/* Compute the cost of an address.  For the 29k, all valid addresses are
   the same cost.  */

#define ADDRESS_COST(X)  0

/* Define this if some processing needs to be done immediately before
   emitting code for an insn.  */

/* #define FINAL_PRESCAN_INSN(INSN,OPERANDS,NOPERANDS) */

/* 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 */

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

   We actually lie a bit here as overflow conditions are different.  But
   they aren't being checked anyway.  */

#define FIXUNS_TRUNC_LIKE_FIX_TRUNC

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

   For the 29k, we will define movti, so put this at 4 words.  */
#define MOVE_MAX 16

/* Largest number of bytes of an object that can be placed in a register.
   On the 29k we have plenty of registers, so use TImode.  */
#define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (TImode)

/* Nonzero if access to memory by bytes is no faster than for words.
   Also non-zero if doing byte operations (specifically shifts) in registers
   is undesirable. 

   On the 29k, large masks are expensive, so we want to use bytes to
   manipulate fields.  */
#define SLOW_BYTE_ACCESS  0

/* Define if operations between registers always perform the operation
   on the full register even if a narrower mode is specified.  */
#define WORD_REGISTER_OPERATIONS

/* Define if loading in MODE, an integral mode narrower than BITS_PER_WORD
   will either zero-extend or sign-extend.  The value of this macro should
   be the code that says which one of the two operations is implicitly
   done, NIL if none.  */
#define LOAD_EXTEND_OP(MODE) ZERO_EXTEND

/* Define if the object format being used is COFF or a superset.  */
#define OBJECT_FORMAT_COFF

/* This uses COFF, so it wants SDB format.  */
#define SDB_DEBUGGING_INFO

/* Define this to be the delimiter between SDB sub-sections.  The default
   is ";".  */
#define SDB_DELIM "\n"

/* Do not break .stabs pseudos into continuations.  */
#define DBX_CONTIN_LENGTH 0

/* Don't try to use the `x' type-cross-reference character in DBX data.
   Also has the consequence of putting each struct, union or enum
   into a separate .stabs, containing only cross-refs to the others.  */
#define DBX_NO_XREFS

/* 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, which
   is just the sign bit.  */

#define STORE_FLAG_VALUE (-2147483647 - 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 SImode

/* Mode of a function address in a call instruction (for indexing purposes).

   Doesn't matter on 29k.  */
#define FUNCTION_MODE SImode

/* Define this if addresses of constant functions
   shouldn't be put through pseudo regs where they can be cse'd.
   Desirable on machines where ordinary constants are expensive
   but a CALL with constant address is cheap.  */
#define NO_FUNCTION_CSE

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

/* 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.

   We only care about the cost if it is valid in an insn.  The only
   constants that cause an insn to generate more than one machine
   instruction are those involving floating-point or address.  So 
   only these need be expensive.  */

#define CONST_COSTS(RTX,CODE,OUTER_CODE) \
  case CONST_INT:           \
    return 0;             \
  case CONST:             \
  case LABEL_REF:           \
  case SYMBOL_REF:            \
    return 6;             \
  case CONST_DOUBLE:            \
    return GET_MODE (RTX) == SFmode ? 6 : 8;
    
/* Provide the costs of a rtl expression.  This is in the body of a
   switch on CODE.

   All MEMs cost the same if they are valid.  This is used to ensure
   that (mem (symbol_ref ...)) is placed into a CALL when valid.

   The multiply cost depends on whether this is a 29050 or not.  */

#define RTX_COSTS(X,CODE,OUTER_CODE)      \
  case MULT:            \
    return TARGET_29050 ? COSTS_N_INSNS (2) : COSTS_N_INSNS (40);  \
  case DIV:           \
  case UDIV:            \
  case MOD:           \
  case UMOD:            \
    return COSTS_N_INSNS (50);        \
  case MEM:           \
    return COSTS_N_INSNS (2);

/* Control the assembler format that we output.  */

/* Output at beginning of assembler file.  */

#define ASM_FILE_START(FILE)          \
{ const char *p, *after_dir = main_input_filename;    \
  if (TARGET_29050)           \
    fprintf (FILE, "\t.cputype 29050\n");     \
  for (p = main_input_filename; *p; p++)      \
    if (*p == '/')            \
      after_dir = p + 1;          \
  fprintf (FILE, "\t.file ");         \
  output_quoted_string (FILE, after_dir);     \
  fprintf (FILE, "\n");           \
  fprintf (FILE, "\t.sect .lit,lit\n"); }

/* Output to assembler file text saying following lines
   may contain character constants, extra white space, comments, etc.  */

#define ASM_APP_ON ""

/* Output to assembler file text saying following lines
   no longer contain unusual constructs.  */

#define ASM_APP_OFF ""

/* The next few macros don't have tabs on most machines, but
   at least one 29K assembler wants them.  */

/* Output before instructions.  */

#define TEXT_SECTION_ASM_OP "\t.text"

/* Output before read-only data.  */

#define READONLY_DATA_SECTION_ASM_OP "\t.use .lit"

/* Output before writable data.  */

#define DATA_SECTION_ASM_OP "\t.data"

/* Define an extra section for read-only data, a routine to enter it, and
   indicate that it is for read-only data.  */

#define EXTRA_SECTIONS  readonly_data

#define EXTRA_SECTION_FUNCTIONS         \
void                \
literal_section ()            \
{               \
  if (in_section != readonly_data)        \
    {               \
      fprintf (asm_out_file, "%s\n", READONLY_DATA_SECTION_ASM_OP); \
      in_section = readonly_data;       \
    }               \
}               \

#define READONLY_DATA_SECTION literal_section

/* If we are referencing a function that is static or is known to be
   in this file, make the SYMBOL_REF special.  We can use this to indicate
   that we can branch to this function without emitting a no-op after the
   call.  */

#define ENCODE_SECTION_INFO(DECL)  \
  if (TREE_CODE (DECL) == FUNCTION_DECL     \
      && (TREE_ASM_WRITTEN (DECL) || ! TREE_PUBLIC (DECL))) \
    SYMBOL_REF_FLAG (XEXP (DECL_RTL (DECL), 0)) = 1;

/* How to refer to registers in assembler output.
   This sequence is indexed by compiler's hard-register-number (see above).  */

#define REGISTER_NAMES \
{"gr96", "gr97", "gr98", "gr99", "gr100", "gr101", "gr102", "gr103", "gr104", \
 "gr105", "gr106", "gr107", "gr108", "gr109", "gr110", "gr111", "gr112", \
 "gr113", "gr114", "gr115", "gr116", "gr117", "gr118", "gr119", "gr120", \
 "gr121", "gr122", "gr123", "gr124", "gr125", "gr126", "gr127",    \
 "lr0", "lr1", "lr2", "lr3", "lr4", "lr5", "lr6", "lr7", "lr8", "lr9",   \
 "lr10", "lr11", "lr12", "lr13", "lr14", "lr15", "lr16", "lr17", "lr18", \
 "lr19", "lr20", "lr21", "lr22", "lr23", "lr24", "lr25", "lr26", "lr27", \
 "lr28", "lr29", "lr30", "lr31", "lr32", "lr33", "lr34", "lr35", "lr36", \
 "lr37", "lr38", "lr39", "lr40", "lr41", "lr42", "lr43", "lr44", "lr45", \
 "lr46", "lr47", "lr48", "lr49", "lr50", "lr51", "lr52", "lr53", "lr54", \
 "lr55", "lr56", "lr57", "lr58", "lr59", "lr60", "lr61", "lr62", "lr63", \
 "lr64", "lr65", "lr66", "lr67", "lr68", "lr69", "lr70", "lr71", "lr72", \
 "lr73", "lr74", "lr75", "lr76", "lr77", "lr78", "lr79", "lr80", "lr81", \
 "lr82", "lr83", "lr84", "lr85", "lr86", "lr87", "lr88", "lr89", "lr90", \
 "lr91", "lr92", "lr93", "lr94", "lr95", "lr96", "lr97", "lr98", "lr99", \
 "lr100", "lr101", "lr102", "lr103", "lr104", "lr105", "lr106", "lr107", \
 "lr108", "lr109", "lr110", "lr111", "lr112", "lr113", "lr114", "lr115", \
 "lr116", "lr117", "lr118", "lr119", "lr120", "lr121", "lr122", "lr123", \
 "lr124", "lr125", "lr126", "lr127",           \
  "AI0", "AI1", "AI2", "AI3", "AI4", "AI5", "AI6", "AI7", "AI8", "AI9",  \
  "AI10", "AI11", "AI12", "AI13", "AI14", "AI15", "FP",      \
  "bp", "fc", "cr", "q",             \
  "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr",  \
  "pc0", "pc1", "pc2", "mmu", "lru", "fpe", "int", "fps", "exo",   \
  "0", "1", "2", "3",              \
  "gr64", "gr65", "gr66", "gr67", "gr68", "gr69", "gr70", "gr71",  \
  "gr72", "gr73", "gr74", "gr75", "gr76", "gr77", "gr78", "gr79",  \
  "gr80", "gr81", "gr82", "gr83", "gr84", "gr85", "gr86", "gr87",  \
  "gr88", "gr89", "gr90", "gr91", "gr92", "gr93", "gr94", "gr95" }

/* How to renumber registers for dbx and gdb.  */

extern int a29k_debug_reg_map[FIRST_PSEUDO_REGISTER];
#define DBX_REGISTER_NUMBER(REGNO) a29k_debug_reg_map[REGNO]

/* Switch into a generic section.  */
#define TARGET_ASM_NAMED_SECTION a29k_asm_named_section

/* This is how to output the definition of a user-level label named NAME,
   such as the label on a static function or variable NAME.  */

#define ASM_OUTPUT_LABEL(FILE,NAME) \
  do { assemble_name (FILE, NAME); fputs (":\n", FILE); } while (0)

/* This is how to output a command to make the user-level label named NAME
   defined for reference from other files.  */

#define ASM_GLOBALIZE_LABEL(FILE,NAME)  \
  do { fputs ("\t.global ", FILE); assemble_name (FILE, NAME); fputs ("\n", FILE);} while (0)

/* The prefix to add to user-visible assembler symbols.  */

#undef USER_LABEL_PREFIX
#define USER_LABEL_PREFIX "_"

/* This is how to output an internal numbered label where
   PREFIX is the class of label and NUM is the number within the class.  */

#define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)  \
  fprintf (FILE, "%s%d:\n", PREFIX, NUM)

/* This is how to output a label for a jump table.  Arguments are the same as
   for ASM_OUTPUT_INTERNAL_LABEL, except the insn for the jump table is
   passed.  */

#define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)  \
{ ASM_OUTPUT_ALIGN (FILE, 2); ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); }

/* This is how to store into the string LABEL
   the symbol_ref name of an internal numbered label where
   PREFIX is the class of label and NUM is the number within the class.
   This is suitable for output with `assemble_name'.  */

#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
  sprintf (LABEL, "*%s%d", PREFIX, NUM)

/* This is how to output an insn to push a register on the stack.
   It need not be very fast code.  */

#define ASM_OUTPUT_REG_PUSH(FILE,REGNO)         \
  fprintf (FILE, "\tsub %s,%s,4\n\tstore 0,0,%s,%s\n",      \
           reg_names[R_MSP], reg_names[R_MSP], reg_names[REGNO],  \
     reg_names[R_MSP]);

/* This is how to output an insn to pop a register from the stack.
   It need not be very fast code.  */

#define ASM_OUTPUT_REG_POP(FILE,REGNO)          \
  fprintf (FILE, "\tload 0,0,%s,%s\n\tadd %s,%s,4\n",     \
           reg_names[REGNO], reg_names[R_MSP], reg_names[R_MSP],  \
     reg_names[R_MSP]);

/* This is how to output an element of a case-vector that is absolute.  */

#define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  fprintf (FILE, "\t.word L%d\n", VALUE)

/* This is how to output an element of a case-vector that is relative.
   Don't define this if it is not supported.  */

/* #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) */

/* This is how to output an assembler line
   that says to advance the location counter
   to a multiple of 2**LOG bytes.  */

#define ASM_OUTPUT_ALIGN(FILE,LOG)  \
  if ((LOG) != 0)     \
    fprintf (FILE, "\t.align %d\n", 1 << (LOG))

#define ASM_OUTPUT_SKIP(FILE,SIZE)  \
  fprintf (FILE, "\t.block %d\n", (SIZE))

/* This says how to output an assembler line
   to define a global common symbol.  */

#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
( fputs ("\t.comm ", (FILE)),     \
  assemble_name ((FILE), (NAME)),   \
  fprintf ((FILE), ",%d\n", (SIZE)))

/* This says how to output an assembler line
   to define a local common symbol.  */

#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE,ROUNDED)  \
( fputs ("\t.lcomm ", (FILE)),        \
  assemble_name ((FILE), (NAME)),     \
  fprintf ((FILE), ",%d\n", (SIZE)))

/* Store in OUTPUT a string (made with alloca) containing
   an assembler-name for a local static variable named NAME.
   LABELNO is an integer which is different for each call.  */

#define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)  \
( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10),  \
  sprintf ((OUTPUT), "%s.%d", (NAME), (LABELNO)))

/* Print operand X (an rtx) in assembler syntax to file FILE.
   CODE is a letter or dot (`z' in `%z0') or 0 if no letter was specified.
   For `%' followed by punctuation, CODE is the punctuation and X is null.  */

#define PRINT_OPERAND(FILE, X, CODE)  print_operand (FILE, X, CODE)

/* Determine which codes are valid without a following integer.  These must
   not be alphabetic.

   We support `#' which is null if a delay slot exists, otherwise
   "\n\tnop" and `*' which prints the register name for TPC (gr122).  */

#define PRINT_OPERAND_PUNCT_VALID_P(CODE) ((CODE) == '#' || (CODE) == '*')

/* Print a memory address as an operand to reference that memory location.  */

#define PRINT_OPERAND_ADDRESS(FILE, ADDR)  \
{ register rtx addr = ADDR;         \
  if (!REG_P (addr)           \
      && ! (GET_CODE (addr) == CONST_INT      \
      && INTVAL (addr) >= 0 && INTVAL (addr) < 256))  \
    abort ();             \
  output_operand (addr, 0);         \
}
/* Define the codes that are matched by predicates in a29k.c.  */

#define PREDICATE_CODES \
  {"cint_8_operand", {CONST_INT}},        \
  {"cint_16_operand", {CONST_INT}},       \
  {"long_const_operand", {CONST_INT, CONST, CONST_DOUBLE, \
        LABEL_REF, SYMBOL_REF}},    \
  {"const_0_operand", {CONST_INT, ASHIFT}},     \
  {"const_8_operand", {CONST_INT, ASHIFT}},     \
  {"const_16_operand", {CONST_INT, ASHIFT}},      \
  {"const_24_operand", {CONST_INT, ASHIFT}},      \
  {"float_const_operand", {CONST_DOUBLE}},      \
  {"gpc_reg_operand", {SUBREG, REG}},       \
  {"gpc_reg_or_float_constant_operand", {SUBREG, REG, CONST_DOUBLE}}, \
  {"gpc_reg_or_integer_constant_operand", {SUBREG, REG,   \
             CONST_INT, CONST_DOUBLE}}, \
  {"gpc_reg_or_immediate_operand", {SUBREG, REG, CONST_INT, \
            CONST_DOUBLE, CONST,  \
            SYMBOL_REF, LABEL_REF}},  \
  {"spec_reg_operand", {REG}},          \
  {"accum_reg_operand", {REG}},         \
  {"srcb_operand", {SUBREG, REG, CONST_INT}},     \
  {"cmplsrcb_operand", {SUBREG, REG, CONST_INT}},   \
  {"reg_or_immediate_operand", {SUBREG, REG, CONST_INT, CONST,  \
        CONST_DOUBLE, CONST, SYMBOL_REF, LABEL_REF}}, \
  {"reg_or_u_short_operand", {SUBREG, REG, CONST_INT}},   \
  {"and_operand", {SUBREG, REG, CONST_INT}},      \
  {"add_operand", {SUBREG, REG, CONST_INT}},      \
  {"call_operand", {SYMBOL_REF, CONST_INT}},      \
  {"in_operand", {SUBREG, MEM, REG, CONST_INT, CONST, SYMBOL_REF, \
      LABEL_REF, CONST_DOUBLE}},      \
  {"out_operand", {SUBREG, REG, MEM}},        \
  {"reload_memory_operand", {SUBREG, REG, MEM}},    \
  {"fp_comparison_operator", {EQ, GT, GE}},     \
  {"branch_operator", {GE, LT}},        \
  {"load_multiple_operation", {PARALLEL}},      \
  {"store_multiple_operation", {PARALLEL}},     \
  {"epilogue_operand", {CODE_LABEL}},

---