Subversion Repositories openrisc

/* Definitions of target machine for GNU compiler, for IBM S/390

   Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,

   2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.

   Contributed by Hartmut Penner (hpenner@de.ibm.com) and

                  Ulrich Weigand (uweigand@de.ibm.com).

                  Andreas Krebbel (Andreas.Krebbel@de.ibm.com)

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/>.  */

#ifndef _S390_H

#define _S390_H

/* Optional architectural facilities supported by the processor.  */

enum processor_flags

{

  PF_IEEE_FLOAT = 1,

  PF_ZARCH = 2,

  PF_LONG_DISPLACEMENT = 4,

  PF_EXTIMM = 8,

  PF_DFP = 16,

  PF_Z10 = 32,

  PF_Z196 = 64

};

/* This is necessary to avoid a warning about comparing different enum

   types.  */

#define s390_tune_attr ((enum attr_cpu)s390_tune)

/* These flags indicate that the generated code should run on a cpu

   providing the respective hardware facility regardless of the

   current cpu mode (ESA or z/Architecture).  */

#define TARGET_CPU_IEEE_FLOAT \

        (s390_arch_flags & PF_IEEE_FLOAT)

#define TARGET_CPU_ZARCH \

        (s390_arch_flags & PF_ZARCH)

#define TARGET_CPU_LONG_DISPLACEMENT \

        (s390_arch_flags & PF_LONG_DISPLACEMENT)

#define TARGET_CPU_EXTIMM \

        (s390_arch_flags & PF_EXTIMM)

#define TARGET_CPU_DFP \

        (s390_arch_flags & PF_DFP)

#define TARGET_CPU_Z10 \

        (s390_arch_flags & PF_Z10)

#define TARGET_CPU_Z196 \

        (s390_arch_flags & PF_Z196)

/* These flags indicate that the generated code should run on a cpu

   providing the respective hardware facility when run in

   z/Architecture mode.  */

#define TARGET_LONG_DISPLACEMENT \

       (TARGET_ZARCH && TARGET_CPU_LONG_DISPLACEMENT)

#define TARGET_EXTIMM \

       (TARGET_ZARCH && TARGET_CPU_EXTIMM)

#define TARGET_DFP \

       (TARGET_ZARCH && TARGET_CPU_DFP && TARGET_HARD_FLOAT)

#define TARGET_Z10 \

       (TARGET_ZARCH && TARGET_CPU_Z10)

#define TARGET_Z196 \

       (TARGET_ZARCH && TARGET_CPU_Z196)

#define TARGET_AVOID_CMP_AND_BRANCH (s390_tune == PROCESSOR_2817_Z196)

/* Run-time target specification.  */

/* Defaults for option flags defined only on some subtargets.  */

#ifndef TARGET_TPF_PROFILING

#define TARGET_TPF_PROFILING 0

#endif

/* This will be overridden by OS headers.  */

#define TARGET_TPF 0

/* Target CPU builtins.  */

#define TARGET_CPU_CPP_BUILTINS()                       \

  do                                                    \

    {                                                   \

      builtin_assert ("cpu=s390");                      \

      builtin_assert ("machine=s390");                  \

      builtin_define ("__s390__");                      \

      if (TARGET_ZARCH)                                 \

        builtin_define ("__zarch__");                   \

      if (TARGET_64BIT)                                 \

        builtin_define ("__s390x__");                   \

      if (TARGET_LONG_DOUBLE_128)                       \

        builtin_define ("__LONG_DOUBLE_128__");         \

    }                                                   \

  while (0)

#ifdef DEFAULT_TARGET_64BIT

#define TARGET_DEFAULT             (MASK_64BIT | MASK_ZARCH | MASK_HARD_DFP)

#else

#define TARGET_DEFAULT             0

#endif

/* Support for configure-time defaults.  */

#define OPTION_DEFAULT_SPECS                                    \

  { "mode", "%{!mesa:%{!mzarch:-m%(VALUE)}}" },                 \

  { "arch", "%{!march=*:-march=%(VALUE)}" },                    \

  { "tune", "%{!mtune=*:-mtune=%(VALUE)}" }

/* Defaulting rules.  */

#ifdef DEFAULT_TARGET_64BIT

#define DRIVER_SELF_SPECS                                       \

  "%{!m31:%{!m64:-m64}}",                                       \

  "%{!mesa:%{!mzarch:%{m31:-mesa}%{m64:-mzarch}}}",             \

  "%{!march=*:%{mesa:-march=g5}%{mzarch:-march=z900}}"

#else

#define DRIVER_SELF_SPECS                                       \

  "%{!m31:%{!m64:-m31}}",                                       \

  "%{!mesa:%{!mzarch:%{m31:-mesa}%{m64:-mzarch}}}",             \

  "%{!march=*:%{mesa:-march=g5}%{mzarch:-march=z900}}"

#endif

/* Constants needed to control the TEST DATA CLASS (TDC) instruction.  */

#define S390_TDC_POSITIVE_ZERO                     (1 << 11)

#define S390_TDC_NEGATIVE_ZERO                     (1 << 10)

#define S390_TDC_POSITIVE_NORMALIZED_BFP_NUMBER    (1 << 9)

#define S390_TDC_NEGATIVE_NORMALIZED_BFP_NUMBER    (1 << 8)

#define S390_TDC_POSITIVE_DENORMALIZED_BFP_NUMBER  (1 << 7)

#define S390_TDC_NEGATIVE_DENORMALIZED_BFP_NUMBER  (1 << 6)

#define S390_TDC_POSITIVE_INFINITY                 (1 << 5)

#define S390_TDC_NEGATIVE_INFINITY                 (1 << 4)

#define S390_TDC_POSITIVE_QUIET_NAN                (1 << 3)

#define S390_TDC_NEGATIVE_QUIET_NAN                (1 << 2)

#define S390_TDC_POSITIVE_SIGNALING_NAN            (1 << 1)

#define S390_TDC_NEGATIVE_SIGNALING_NAN            (1 << 0)

/* The following values are different for DFP.  */

#define S390_TDC_POSITIVE_DENORMALIZED_DFP_NUMBER (1 << 9)

#define S390_TDC_NEGATIVE_DENORMALIZED_DFP_NUMBER (1 << 8)

#define S390_TDC_POSITIVE_NORMALIZED_DFP_NUMBER   (1 << 7)

#define S390_TDC_NEGATIVE_NORMALIZED_DFP_NUMBER   (1 << 6)

/* For signbit, the BFP-DFP-difference makes no difference. */

#define S390_TDC_SIGNBIT_SET (S390_TDC_NEGATIVE_ZERO \

                          | S390_TDC_NEGATIVE_NORMALIZED_BFP_NUMBER \

                          | S390_TDC_NEGATIVE_DENORMALIZED_BFP_NUMBER\

                          | S390_TDC_NEGATIVE_INFINITY \

                          | S390_TDC_NEGATIVE_QUIET_NAN \

                          | S390_TDC_NEGATIVE_SIGNALING_NAN )

#define S390_TDC_INFINITY (S390_TDC_POSITIVE_INFINITY \

                          | S390_TDC_NEGATIVE_INFINITY )

/* Target machine storage layout.  */

/* Everything is big-endian.  */

#define BITS_BIG_ENDIAN 1

#define BYTES_BIG_ENDIAN 1

#define WORDS_BIG_ENDIAN 1

#define STACK_SIZE_MODE (Pmode)

#ifndef IN_LIBGCC2

/* Width of a word, in units (bytes).  */

  #define UNITS_PER_WORD (TARGET_ZARCH ? 8 : 4)

/* Width of a pointer.  To be used instead of UNITS_PER_WORD in

   ABI-relevant contexts.  This always matches

   GET_MODE_SIZE (Pmode).  */

  #define UNITS_PER_LONG (TARGET_64BIT ? 8 : 4)

  #define MIN_UNITS_PER_WORD 4

  #define MAX_BITS_PER_WORD 64

#else

  /* In libgcc, UNITS_PER_WORD has ABI-relevant effects, e.g. whether

     the library should export TImode functions or not.  Thus, we have

     to redefine UNITS_PER_WORD depending on __s390x__ for libgcc.  */

  #ifdef __s390x__

    #define UNITS_PER_WORD 8

  #else

    #define UNITS_PER_WORD 4

  #endif

#endif

/* Width of a pointer, in bits.  */

#define POINTER_SIZE (TARGET_64BIT ? 64 : 32)

/* Allocation boundary (in *bits*) for storing arguments in argument list.  */

#define PARM_BOUNDARY (TARGET_64BIT ? 64 : 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

/* There is no point aligning anything to a rounder boundary than this.  */

#define BIGGEST_ALIGNMENT 64

/* Alignment of field after `int : 0' in a structure.  */

#define EMPTY_FIELD_BOUNDARY 32

/* Alignment on even addresses for LARL instruction.  */

#define CONSTANT_ALIGNMENT(EXP, ALIGN) (ALIGN) < 16 ? 16 : (ALIGN)

#define DATA_ALIGNMENT(TYPE, ALIGN) (ALIGN) < 16 ? 16 : (ALIGN)

/* Alignment is not required by the hardware.  */

#define STRICT_ALIGNMENT 0

/* Mode of stack savearea.

   FUNCTION is VOIDmode because calling convention maintains SP.

   BLOCK needs Pmode for SP.

   NONLOCAL needs twice Pmode to maintain both backchain and SP.  */

#define STACK_SAVEAREA_MODE(LEVEL)      \

  (LEVEL == SAVE_FUNCTION ? VOIDmode    \

  : LEVEL == SAVE_NONLOCAL ? (TARGET_64BIT ? OImode : TImode) : Pmode)

/* Type layout.  */

/* Sizes in bits of the source language data types.  */

#define SHORT_TYPE_SIZE 16

#define INT_TYPE_SIZE 32

#define LONG_TYPE_SIZE (TARGET_64BIT ? 64 : 32)

#define LONG_LONG_TYPE_SIZE 64

#define FLOAT_TYPE_SIZE 32

#define DOUBLE_TYPE_SIZE 64

#define LONG_DOUBLE_TYPE_SIZE (TARGET_LONG_DOUBLE_128 ? 128 : 64)

/* Define this to set long double type size to use in libgcc2.c, which can

   not depend on target_flags.  */

#ifdef __LONG_DOUBLE_128__

#define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 128

#else

#define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64

#endif

/* Work around target_flags dependency in ada/targtyps.c.  */

#define WIDEST_HARDWARE_FP_SIZE 64

/* We use "unsigned char" as default.  */

#define DEFAULT_SIGNED_CHAR 0

/* Register usage.  */

/* We have 16 general purpose registers (registers 0-15),

   and 16 floating point registers (registers 16-31).

   (On non-IEEE machines, we have only 4 fp registers.)

   Amongst the general purpose registers, some are used

   for specific purposes:

   GPR 11: Hard frame pointer (if needed)

   GPR 12: Global offset table pointer (if needed)

   GPR 13: Literal pool base register

   GPR 14: Return address register

   GPR 15: Stack pointer

   Registers 32-35 are 'fake' hard registers that do not

   correspond to actual hardware:

   Reg 32: Argument pointer

   Reg 33: Condition code

   Reg 34: Frame pointer

   Reg 35: Return address pointer

   Registers 36 and 37 are mapped to access registers

#define FIRST_PSEUDO_REGISTER 38

/* Standard register usage.  */

#define GENERAL_REGNO_P(N)      ((int)(N) >= 0 && (N) < 16)

#define ADDR_REGNO_P(N)         ((N) >= 1 && (N) < 16)

#define FP_REGNO_P(N)           ((N) >= 16 && (N) < 32)

#define CC_REGNO_P(N)           ((N) == 33)

#define FRAME_REGNO_P(N)        ((N) == 32 || (N) == 34 || (N) == 35)

#define ACCESS_REGNO_P(N)       ((N) == 36 || (N) == 37)

#define GENERAL_REG_P(X)        (REG_P (X) && GENERAL_REGNO_P (REGNO (X)))

#define ADDR_REG_P(X)           (REG_P (X) && ADDR_REGNO_P (REGNO (X)))

#define FP_REG_P(X)             (REG_P (X) && FP_REGNO_P (REGNO (X)))

#define CC_REG_P(X)             (REG_P (X) && CC_REGNO_P (REGNO (X)))

#define FRAME_REG_P(X)          (REG_P (X) && FRAME_REGNO_P (REGNO (X)))

#define ACCESS_REG_P(X)         (REG_P (X) && ACCESS_REGNO_P (REGNO (X)))

/* Set up fixed registers and calling convention:

   GPRs 0-5 are always call-clobbered,

   GPRs 6-15 are always call-saved.

   GPR 12 is fixed if used as GOT pointer.

   GPR 13 is always fixed (as literal pool pointer).

   GPR 14 is always fixed on S/390 machines (as return address).

   GPR 15 is always fixed (as stack pointer).

   The 'fake' hard registers are call-clobbered and fixed.

   The access registers are call-saved and fixed.

   On 31-bit, FPRs 18-19 are call-clobbered;

   on 64-bit, FPRs 24-31 are call-clobbered.

   The remaining FPRs are call-saved.  */

#define FIXED_REGISTERS                         \

{ 0, 0, 0, 0,                                       \

  0, 0, 0, 0,                                       \

  0, 0, 0, 0,                                       \

  0, 1, 1, 1,                                    \

  0, 0, 0, 0,                                       \

  0, 0, 0, 0,                                       \

  0, 0, 0, 0,                                       \

  0, 0, 0, 0,                                       \

  1, 1, 1, 1,                                   \

  1, 1 }

#define CALL_USED_REGISTERS                     \

{ 1, 1, 1, 1,                                   \

  1, 1, 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 }

#define CALL_REALLY_USED_REGISTERS              \

{ 1, 1, 1, 1,                                   \

  1, 1, 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,                                   \

  0, 0 }

/* Preferred register allocation order.  */

#define REG_ALLOC_ORDER                                         \

{  1, 2, 3, 4, 5, 0, 12, 11, 10, 9, 8, 7, 6, 14, 13,            \

   16, 17, 18, 19, 20, 21, 22, 23,                              \

   24, 25, 26, 27, 28, 29, 30, 31,                              \

   15, 32, 33, 34, 35, 36, 37 }

/* Fitting values into registers.  */

/* Integer modes <= word size fit into any GPR.

   Integer modes > word size fit into successive GPRs, starting with

   an even-numbered register.

   SImode and DImode fit into FPRs as well.

   Floating point modes <= word size fit into any FPR or GPR.

   Floating point modes > word size (i.e. DFmode on 32-bit) fit

   into any FPR, or an even-odd GPR pair.

   TFmode fits only into an even-odd FPR pair.

   Complex floating point modes fit either into two FPRs, or into

   successive GPRs (again starting with an even number).

   TCmode fits only into two successive even-odd FPR pairs.

   Condition code modes fit only into the CC register.  */

/* Because all registers in a class have the same size HARD_REGNO_NREGS

   is equivalent to CLASS_MAX_NREGS.  */

#define HARD_REGNO_NREGS(REGNO, MODE)                           \

  s390_class_max_nregs (REGNO_REG_CLASS (REGNO), (MODE))

#define HARD_REGNO_MODE_OK(REGNO, MODE)         \

  s390_hard_regno_mode_ok ((REGNO), (MODE))

#define HARD_REGNO_RENAME_OK(FROM, TO)          \

  s390_hard_regno_rename_ok (FROM, TO)

#define MODES_TIEABLE_P(MODE1, MODE2)           \

   (((MODE1) == SFmode || (MODE1) == DFmode)    \

   == ((MODE2) == SFmode || (MODE2) == DFmode))

/* When generating code that runs in z/Architecture mode,

   but conforms to the 31-bit ABI, GPRs can hold 8 bytes;

   the ABI guarantees only that the lower 4 bytes are

   saved across calls, however.  */

#define HARD_REGNO_CALL_PART_CLOBBERED(REGNO, MODE)             \

  (!TARGET_64BIT && TARGET_ZARCH                                \

   && GET_MODE_SIZE (MODE) > 4                                  \

   && (((REGNO) >= 6 && (REGNO) <= 15) || (REGNO) == 32))

/* Maximum number of registers to represent a value of mode MODE

   in a register of class CLASS.  */

#define CLASS_MAX_NREGS(CLASS, MODE)                                    \

  s390_class_max_nregs ((CLASS), (MODE))

/* If a 4-byte value is loaded into a FPR, it is placed into the

   *upper* half of the register, not the lower.  Therefore, we

   cannot use SUBREGs to switch between modes in FP registers.

   Likewise for access registers, since they have only half the

   word size on 64-bit.  */

#define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS)                       \

  (GET_MODE_SIZE (FROM) != GET_MODE_SIZE (TO)                           \

   ? ((reg_classes_intersect_p (FP_REGS, CLASS)                         \

       && (GET_MODE_SIZE (FROM) < 8 || GET_MODE_SIZE (TO) < 8))         \

      || reg_classes_intersect_p (ACCESS_REGS, CLASS)) : 0)

/* Register classes.  */

/* We use the following register classes:

   GENERAL_REGS     All general purpose registers

   ADDR_REGS        All general purpose registers except %r0

                    (These registers can be used in address generation)

   FP_REGS          All floating point registers

   CC_REGS          The condition code register

   ACCESS_REGS      The access registers

   GENERAL_FP_REGS  Union of GENERAL_REGS and FP_REGS

   ADDR_FP_REGS     Union of ADDR_REGS and FP_REGS

   GENERAL_CC_REGS  Union of GENERAL_REGS and CC_REGS

   ADDR_CC_REGS     Union of ADDR_REGS and CC_REGS

   NO_REGS          No registers

   ALL_REGS         All registers

   Note that the 'fake' frame pointer and argument pointer registers

   are included amongst the address registers here.  */

enum reg_class

{

  NO_REGS, CC_REGS, ADDR_REGS, GENERAL_REGS, ACCESS_REGS,

  ADDR_CC_REGS, GENERAL_CC_REGS,

  FP_REGS, ADDR_FP_REGS, GENERAL_FP_REGS,

  ALL_REGS, LIM_REG_CLASSES

};

#define N_REG_CLASSES (int) LIM_REG_CLASSES

#define REG_CLASS_NAMES                                                 \

{ "NO_REGS", "CC_REGS", "ADDR_REGS", "GENERAL_REGS", "ACCESS_REGS",     \

  "ADDR_CC_REGS", "GENERAL_CC_REGS",                                    \

  "FP_REGS", "ADDR_FP_REGS", "GENERAL_FP_REGS", "ALL_REGS" }

/* Class -> register mapping.  */

#define REG_CLASS_CONTENTS \

{                                                       \

  { 0x00000000, 0x00000000 },   /* NO_REGS */           \

  { 0x00000000, 0x00000002 },   /* CC_REGS */           \

  { 0x0000fffe, 0x0000000d },   /* ADDR_REGS */         \

  { 0x0000ffff, 0x0000000d },   /* GENERAL_REGS */      \

  { 0x00000000, 0x00000030 },   /* ACCESS_REGS */       \

  { 0x0000fffe, 0x0000000f },   /* ADDR_CC_REGS */      \

  { 0x0000ffff, 0x0000000f },   /* GENERAL_CC_REGS */   \

  { 0xffff0000, 0x00000000 },   /* FP_REGS */           \

  { 0xfffffffe, 0x0000000d },   /* ADDR_FP_REGS */      \

  { 0xffffffff, 0x0000000d },   /* GENERAL_FP_REGS */   \

  { 0xffffffff, 0x0000003f },   /* ALL_REGS */          \

}

/* In some case register allocation order is not enough for IRA to

   generate a good code.  The following macro (if defined) increases

   cost of REGNO for a pseudo approximately by pseudo usage frequency

   multiplied by the macro value.

   We avoid usage of BASE_REGNUM by nonzero macro value because the

   reload can decide not to use the hard register because some

   constant was forced to be in memory.  */

#define IRA_HARD_REGNO_ADD_COST_MULTIPLIER(regno)       \

  (regno == BASE_REGNUM ? 0.0 : 0.5)

/* Register -> class mapping.  */

extern const enum reg_class regclass_map[FIRST_PSEUDO_REGISTER];

#define REGNO_REG_CLASS(REGNO) (regclass_map[REGNO])

/* ADDR_REGS can be used as base or index register.  */

#define INDEX_REG_CLASS ADDR_REGS

#define BASE_REG_CLASS ADDR_REGS

/* Check whether REGNO is a hard register of the suitable class

   or a pseudo register currently allocated to one such.  */

#define REGNO_OK_FOR_INDEX_P(REGNO)                                     \

    (((REGNO) < FIRST_PSEUDO_REGISTER                                   \

      && REGNO_REG_CLASS ((REGNO)) == ADDR_REGS)                        \

     || ADDR_REGNO_P (reg_renumber[REGNO]))

#define REGNO_OK_FOR_BASE_P(REGNO) REGNO_OK_FOR_INDEX_P (REGNO)

/* We need secondary memory to move data between GPRs and FPRs.  With

   DFP the ldgr lgdr instructions are available.  But these

   instructions do not handle GPR pairs so it is not possible for 31

   bit.  */

#define SECONDARY_MEMORY_NEEDED(CLASS1, CLASS2, MODE) \

 ((CLASS1) != (CLASS2)                                \

  && ((CLASS1) == FP_REGS || (CLASS2) == FP_REGS)     \

  && (!TARGET_DFP || !TARGET_64BIT || GET_MODE_SIZE (MODE) != 8))

/* Get_secondary_mem widens its argument to BITS_PER_WORD which loses on 64bit

   because the movsi and movsf patterns don't handle r/f moves.  */

#define SECONDARY_MEMORY_NEEDED_MODE(MODE)              \

 (GET_MODE_BITSIZE (MODE) < 32                          \

  ? mode_for_size (32, GET_MODE_CLASS (MODE), 0) \

  : MODE)

/* Stack layout and calling conventions.  */

/* Our stack grows from higher to lower addresses.  However, local variables

   are accessed by positive offsets, and function arguments are stored at

   increasing addresses.  */

#define STACK_GROWS_DOWNWARD

#define FRAME_GROWS_DOWNWARD 1

/* #undef ARGS_GROW_DOWNWARD */

/* The basic stack layout looks like this: the stack pointer points

   to the register save area for called functions.  Above that area

   is the location to place outgoing arguments.  Above those follow

   dynamic allocations (alloca), and finally the local variables.  */

/* Offset from stack-pointer to first location of outgoing args.  */

#define STACK_POINTER_OFFSET (TARGET_64BIT ? 160 : 96)

/* Offset within stack frame to start allocating local variables at.  */

#define STARTING_FRAME_OFFSET 0

/* Offset from the stack pointer register to an item dynamically

   allocated on the stack, e.g., by `alloca'.  */

#define STACK_DYNAMIC_OFFSET(FUNDECL) \

  (STACK_POINTER_OFFSET + crtl->outgoing_args_size)

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

   We have a fake argument pointer register that points directly to

   the argument area.  */

#define FIRST_PARM_OFFSET(FNDECL) 0

/* Defining this macro makes __builtin_frame_address(0) and

   __builtin_return_address(0) work with -fomit-frame-pointer.  */

#define INITIAL_FRAME_ADDRESS_RTX                                             \

  (plus_constant (arg_pointer_rtx, -STACK_POINTER_OFFSET))

/* The return address of the current frame is retrieved

   from the initial value of register RETURN_REGNUM.

   For frames farther back, we use the stack slot where

   the corresponding RETURN_REGNUM register was saved.  */

#define DYNAMIC_CHAIN_ADDRESS(FRAME)                                          \

  (TARGET_PACKED_STACK ?                                                      \

   plus_constant ((FRAME), STACK_POINTER_OFFSET - UNITS_PER_LONG) : (FRAME))

/* For -mpacked-stack this adds 160 - 8 (96 - 4) to the output of

   builtin_frame_address.  Otherwise arg pointer -

   STACK_POINTER_OFFSET would be returned for

   __builtin_frame_address(0) what might result in an address pointing

   somewhere into the middle of the local variables since the packed

   stack layout generally does not need all the bytes in the register

   save area.  */

#define FRAME_ADDR_RTX(FRAME)                   \

  DYNAMIC_CHAIN_ADDRESS ((FRAME))

#define RETURN_ADDR_RTX(COUNT, FRAME)                                         \

  s390_return_addr_rtx ((COUNT), DYNAMIC_CHAIN_ADDRESS ((FRAME)))

/* In 31-bit mode, we need to mask off the high bit of return addresses.  */

#define MASK_RETURN_ADDR (TARGET_64BIT ? constm1_rtx : GEN_INT (0x7fffffff))

/* Exception handling.  */

/* Describe calling conventions for DWARF-2 exception handling.  */

#define INCOMING_RETURN_ADDR_RTX  gen_rtx_REG (Pmode, RETURN_REGNUM)

#define INCOMING_FRAME_SP_OFFSET STACK_POINTER_OFFSET

#define DWARF_FRAME_RETURN_COLUMN  14

/* Describe how we implement __builtin_eh_return.  */

#define EH_RETURN_DATA_REGNO(N) ((N) < 4 ? (N) + 6 : INVALID_REGNUM)

#define EH_RETURN_HANDLER_RTX gen_rtx_MEM (Pmode, return_address_pointer_rtx)

/* Select a format to encode pointers in exception handling data.  */

#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)                          \

  (flag_pic                                                                 \

    ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4 \

   : DW_EH_PE_absptr)

/* Register save slot alignment.  */

#define DWARF_CIE_DATA_ALIGNMENT (-UNITS_PER_LONG)

/* Frame registers.  */

#define STACK_POINTER_REGNUM 15

#define FRAME_POINTER_REGNUM 34

#define HARD_FRAME_POINTER_REGNUM 11

#define ARG_POINTER_REGNUM 32

#define RETURN_ADDRESS_POINTER_REGNUM 35

/* The static chain must be call-clobbered, but not used for

   function argument passing.  As register 1 is clobbered by

   the trampoline code, we only have one option.  */

#define STATIC_CHAIN_REGNUM 0

/* Number of hardware registers that go into the DWARF-2 unwind info.

   To avoid ABI incompatibility, this number must not change even as

   'fake' hard registers are added or removed.  */

#define DWARF_FRAME_REGISTERS 34

/* Frame pointer and argument pointer elimination.  */

#define ELIMINABLE_REGS                                         \

{{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM },                \

 { FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM },           \

 { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM },                  \

 { ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM },             \

 { RETURN_ADDRESS_POINTER_REGNUM, STACK_POINTER_REGNUM },       \

 { RETURN_ADDRESS_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM },  \

 { BASE_REGNUM, BASE_REGNUM }}

#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \

  (OFFSET) = s390_initial_elimination_offset ((FROM), (TO))

/* Stack arguments.  */

/* We need current_function_outgoing_args to be valid.  */

#define ACCUMULATE_OUTGOING_ARGS 1

/* Register arguments.  */

typedef struct s390_arg_structure

{

  int gprs;                     /* gpr so far */

  int fprs;                     /* fpr so far */

}

CUMULATIVE_ARGS;

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

  ((CUM).gprs=0, (CUM).fprs=0)

/* Arguments can be placed in general registers 2 to 6, or in floating

   point registers 0 and 2 for 31 bit and fprs 0, 2, 4 and 6 for 64

   bit.  */

#define FUNCTION_ARG_REGNO_P(N) (((N) >=2 && (N) <7) || \

  (N) == 16 || (N) == 17 || (TARGET_64BIT && ((N) == 18 || (N) == 19)))

/* Only gpr 2 and fpr 0 are ever used as return registers.  */

#define FUNCTION_VALUE_REGNO_P(N) ((N) == 2 || (N) == 16)

/* Function entry and exit.  */

/* When returning from a function, the stack pointer does not matter.  */

#define EXIT_IGNORE_STACK       1

/* Profiling.  */

#define FUNCTION_PROFILER(FILE, LABELNO)                        \

  s390_function_profiler ((FILE), ((LABELNO)))

#define PROFILE_BEFORE_PROLOGUE 1

/* Trampolines for nested functions.  */

#define TRAMPOLINE_SIZE         (TARGET_64BIT ? 32 : 16)

#define TRAMPOLINE_ALIGNMENT    BITS_PER_WORD

/* Addressing modes, and classification of registers for them.  */

/* Recognize any constant value that is a valid address.  */

#define CONSTANT_ADDRESS_P(X) 0

/* Maximum number of registers that can appear in a valid memory address.  */

#define MAX_REGS_PER_ADDRESS 2

/* This definition replaces the formerly used 'm' constraint with a

   different constraint letter in order to avoid changing semantics of

   the 'm' constraint when accepting new address formats in

   TARGET_LEGITIMATE_ADDRESS_P.  The constraint letter defined here

   must not be used in insn definitions or inline assemblies.  */

#define TARGET_MEM_CONSTRAINT 'e'

/* Try a machine-dependent way of reloading an illegitimate address

   operand.  If we find one, push the reload and jump to WIN.  This

   macro is used in only one place: `find_reloads_address' in reload.c.  */

#define LEGITIMIZE_RELOAD_ADDRESS(AD, MODE, OPNUM, TYPE, IND, WIN)      \

do {                                                                    \

  rtx new_rtx = legitimize_reload_address (AD, MODE, OPNUM, (int)(TYPE));       \

  if (new_rtx)                                                          \

    {                                                                   \

      (AD) = new_rtx;                                                   \

      goto WIN;                                                         \

    }                                                                   \

} while (0)

/* Helper macro for s390.c and s390.md to check for symbolic constants.  */

#define SYMBOLIC_CONST(X)       \

(GET_CODE (X) == SYMBOL_REF                                             \

 || GET_CODE (X) == LABEL_REF                                           \

 || (GET_CODE (X) == CONST && symbolic_reference_mentioned_p (X)))

#define TLS_SYMBOLIC_CONST(X)   \

((GET_CODE (X) == SYMBOL_REF && tls_symbolic_operand (X))       \

 || (GET_CODE (X) == CONST && tls_symbolic_reference_mentioned_p (X)))

/* Condition codes.  */

/* Given a comparison code (EQ, NE, etc.) and the first operand of a COMPARE,

   return the mode to be used for the comparison.  */

#define SELECT_CC_MODE(OP, X, Y) s390_select_ccmode ((OP), (X), (Y))

/* Canonicalize a comparison from one we don't have to one we do have.  */

#define CANONICALIZE_COMPARISON(CODE, OP0, OP1) \

  s390_canonicalize_comparison (&(CODE), &(OP0), &(OP1))

/* Relative costs of operations.  */

/* A C expression for the cost of a branch instruction.  A value of 1

   is the default; other values are interpreted relative to that.  */

#define BRANCH_COST(speed_p, predictable_p) s390_branch_cost

/* Nonzero if access to memory by bytes is slow and undesirable.  */

#define SLOW_BYTE_ACCESS 1

/* An integer expression for the size in bits of the largest integer machine

   mode that should actually be used.  We allow pairs of registers.  */

#define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (TARGET_64BIT ? TImode : DImode)

/* The maximum number of bytes that a single instruction can move quickly

   between memory and registers or between two memory locations.  */

#define MOVE_MAX (TARGET_ZARCH ? 16 : 8)

#define MOVE_MAX_PIECES (TARGET_ZARCH ? 8 : 4)

#define MAX_MOVE_MAX 16

/* Determine whether to use move_by_pieces or block move insn.  */

#define MOVE_BY_PIECES_P(SIZE, ALIGN)           \

  ( (SIZE) == 1 || (SIZE) == 2 || (SIZE) == 4   \

    || (TARGET_ZARCH && (SIZE) == 8) )

/* Determine whether to use clear_by_pieces or block clear insn.  */

#define CLEAR_BY_PIECES_P(SIZE, ALIGN)          \

  ( (SIZE) == 1 || (SIZE) == 2 || (SIZE) == 4   \

    || (TARGET_ZARCH && (SIZE) == 8) )

/* This macro is used to determine whether store_by_pieces should be

   called to "memcpy" storage when the source is a constant string.  */

#define STORE_BY_PIECES_P(SIZE, ALIGN) MOVE_BY_PIECES_P (SIZE, ALIGN)