gcc/config/avr/avr.h - gcc.git - Git at Google

 /* Definitions of target machine for GNU compiler,
    for AVR 8-bit microcontrollers.
    Copyright (C) 1998-2025 Free Software Foundation, Inc.
    Contributed by Denis Chertykov (chertykov@gmail.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/>.  */

 typedef struct
 {
   /* Id of the address space as used in c_register_addr_space */
   unsigned char id;

   /* Flavour of memory: 0 = RAM, 1 = Flash */
   int memory_class;

   /* Width of pointer (in bytes) */
   int pointer_size;

   /* Name of the address space as visible to the user */
   const char *name;

   /* Segment (i.e. 64k memory chunk) number.  */
   int segment;

   /* Section prefix, e.g. ".progmem1.data"  */
   const char *section_name;
 } avr_addrspace_t;

 extern const avr_addrspace_t avr_addrspace[];

 /* Known address spaces */

 enum
   {
     ADDR_SPACE_RAM, /* ADDR_SPACE_GENERIC */
     ADDR_SPACE_FLASH,
     ADDR_SPACE_FLASH1,
     ADDR_SPACE_FLASH2,
     ADDR_SPACE_FLASH3,
     ADDR_SPACE_FLASH4,
     ADDR_SPACE_FLASH5,
     ADDR_SPACE_FLASHX,
     ADDR_SPACE_MEMX,
     /* Sentinel */
     ADDR_SPACE_COUNT
   };

 #define TARGET_CPU_CPP_BUILTINS()	avr_cpu_cpp_builtins (pfile)

 #define AVR_SHORT_CALLS (TARGET_SHORT_CALLS                             \
                          && avr_arch == &avr_arch_types[ARCH_AVRXMEGA3])
 #define AVR_HAVE_JMP_CALL (avr_arch->have_jmp_call && ! AVR_SHORT_CALLS)
 #define AVR_HAVE_MUL (avr_arch->have_mul)
 #define AVR_HAVE_MOVW (avr_arch->have_movw_lpmx)
 #define AVR_HAVE_ADIW (!AVR_TINY)
 #define AVR_HAVE_LPM (!AVR_TINY)
 #define AVR_HAVE_LPMX (avr_arch->have_movw_lpmx)
 #define AVR_HAVE_ELPM (avr_arch->have_elpm)
 #define AVR_HAVE_ELPMX (avr_arch->have_elpmx)
 #define AVR_HAVE_RAMPD (avr_arch->have_rampd)
 #define AVR_HAVE_RAMPX (avr_arch->have_rampd)
 #define AVR_HAVE_RAMPY (avr_arch->have_rampd)
 #define AVR_HAVE_RAMPZ (avr_arch->have_elpm             \
                         || avr_arch->have_rampd)
 #define AVR_HAVE_EIJMP_EICALL (avr_arch->have_eijmp_eicall)

 /* Handling of 8-bit SP versus 16-bit SP is as follows:

 FIXME: DRIVER_SELF_SPECS has changed.
    -msp8 is used internally to select the right multilib for targets with
    8-bit SP.  -msp8 is set automatically by DRIVER_SELF_SPECS for devices
    with 8-bit SP or by multilib generation machinery.  If a frame pointer is
    needed and SP is only 8 bits wide, SP is zero-extended to get FP.

    TARGET_TINY_STACK is triggered by -mtiny-stack which is a user option.
    This option has no effect on multilib selection.  It serves to save some
    bytes on 16-bit SP devices by only changing SP_L and leaving SP_H alone.

    These two properties are reflected by built-in macros __AVR_SP8__ resp.
    __AVR_HAVE_8BIT_SP__ and __AVR_HAVE_16BIT_SP__.  During multilib generation
    there is always __AVR_SP8__ == __AVR_HAVE_8BIT_SP__.  */

 #define AVR_HAVE_8BIT_SP                        \
   (TARGET_TINY_STACK || avropt_sp8)

 #define AVR_HAVE_SPH (!avropt_sp8)

 #define AVR_2_BYTE_PC (!AVR_HAVE_EIJMP_EICALL)
 #define AVR_3_BYTE_PC (AVR_HAVE_EIJMP_EICALL)

 #define AVR_XMEGA (avr_arch->xmega_p)
 #define AVR_TINY  (avr_arch->tiny_p)

 #define BITS_BIG_ENDIAN 0
 #define BYTES_BIG_ENDIAN 0
 #define WORDS_BIG_ENDIAN 0

 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(mode, comparison) \
   avr_float_lib_compare_returns_bool (mode, comparison)

 #ifdef IN_LIBGCC2
 /* This is to get correct SI and DI modes in libgcc2.c (32 and 64 bits).  */
 #define UNITS_PER_WORD 4
 #else
 /* Width of a word, in units (bytes).  */
 #define UNITS_PER_WORD 1
 #endif

 #define POINTER_SIZE 16


 /* Maximum sized of reasonable data type
    DImode or Dfmode ...  */
 #define MAX_FIXED_MODE_SIZE 32

 #define PARM_BOUNDARY 8

 #define FUNCTION_BOUNDARY 8

 #define EMPTY_FIELD_BOUNDARY 8

 /* No data type wants to be aligned rounder than this.  */
 #define BIGGEST_ALIGNMENT 8

 #define TARGET_VTABLE_ENTRY_ALIGN 8

 #define STRICT_ALIGNMENT 0

 #define INT_TYPE_SIZE (TARGET_INT8 ? 8 : 16)
 #define SHORT_TYPE_SIZE (INT_TYPE_SIZE == 8 ? INT_TYPE_SIZE : 16)
 #define LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 16 : 32)
 #define LONG_LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 32 : 64)

 #define LONG_LONG_ACCUM_TYPE_SIZE 64

 #define DEFAULT_SIGNED_CHAR 1

 #define SIZE_TYPE (INT_TYPE_SIZE == 8 ? "long unsigned int" : "unsigned int")
 #define PTRDIFF_TYPE (INT_TYPE_SIZE == 8 ? "long int" :"int")

 #define WCHAR_TYPE_SIZE 16

 #define FIRST_PSEUDO_REGISTER 37

 #define GENERAL_REGNO_P(N)	IN_RANGE (N, 2, 31)
 #define GENERAL_REG_P(X)	(REG_P (X) && GENERAL_REGNO_P (REGNO (X)))

 #define FIXED_REGISTERS {\
   1,1,/* r0 r1 */\
   0,0,/* r2 r3 */\
   0,0,/* r4 r5 */\
   0,0,/* r6 r7 */\
   0,0,/* r8 r9 */\
   0,0,/* r10 r11 */\
   0,0,/* r12 r13 */\
   0,0,/* r14 r15 */\
   0,0,/* r16 r17 */\
   0,0,/* r18 r19 */\
   0,0,/* r20 r21 */\
   0,0,/* r22 r23 */\
   0,0,/* r24 r25 */\
   0,0,/* r26 r27 */\
   0,0,/* r28 r29 */\
   0,0,/* r30 r31 */\
   1,1,/*  STACK */\
   1,1, /* arg pointer */						\
   1 /* CC */ }

 #define CALL_USED_REGISTERS {			\
   1,1,/* r0 r1 */				\
     0,0,/* r2 r3 */				\
     0,0,/* r4 r5 */				\
     0,0,/* r6 r7 */				\
     0,0,/* r8 r9 */				\
     0,0,/* r10 r11 */				\
     0,0,/* r12 r13 */				\
     0,0,/* r14 r15 */				\
     0,0,/* r16 r17 */				\
     1,1,/* r18 r19 */				\
     1,1,/* r20 r21 */				\
     1,1,/* r22 r23 */				\
     1,1,/* r24 r25 */				\
     1,1,/* r26 r27 */				\
     0,0,/* r28 r29 */				\
     1,1,/* r30 r31 */				\
     1,1,/*  STACK */				\
     1,1, /* arg pointer */			\
     1 /* CC */ }

 #define REG_ALLOC_ORDER {			\
     24,25,					\
     18,19,					\
     20,21,					\
     22,23,					\
     30,31,					\
     26,27,					\
     28,29,					\
     17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,	\
     0,1,					\
     32,33,34,35,36			\
     }

 #define ADJUST_REG_ALLOC_ORDER avr_adjust_reg_alloc_order()


 enum reg_class {
   NO_REGS,
   R0_REG,			/* r0 */
   POINTER_X_REGS,		/* r26 - r27 */
   POINTER_Y_REGS,		/* r28 - r29 */
   POINTER_Z_REGS,		/* r30 - r31 */
   STACK_REG,			/* STACK */
   BASE_POINTER_REGS,		/* r28 - r31 */
   POINTER_REGS,			/* r26 - r31 */
   ADDW_REGS,			/* r24 - r31 */
   SIMPLE_LD_REGS,		/* r16 - r23 */
   LD_REGS,			/* r16 - r31 */
   NO_LD_REGS,			/* r0 - r15 */
   GENERAL_REGS,			/* r0 - r31 */
   CC_REG,			/* CC */
   ALL_REGS, LIM_REG_CLASSES
 };


 #define N_REG_CLASSES (int)LIM_REG_CLASSES

 #define REG_CLASS_NAMES {					\
 		 "NO_REGS",					\
 		   "R0_REG",	/* r0 */                        \
 		   "POINTER_X_REGS", /* r26 - r27 */		\
 		   "POINTER_Y_REGS", /* r28 - r29 */		\
 		   "POINTER_Z_REGS", /* r30 - r31 */		\
 		   "STACK_REG",	/* STACK */			\
 		   "BASE_POINTER_REGS",	/* r28 - r31 */		\
 		   "POINTER_REGS", /* r26 - r31 */		\
 		   "ADDW_REGS",	/* r24 - r31 */			\
                    "SIMPLE_LD_REGS", /* r16 - r23 */            \
 		   "LD_REGS",	/* r16 - r31 */			\
                    "NO_LD_REGS", /* r0 - r15 */                 \
 		   "GENERAL_REGS", /* r0 - r31 */		\
 		   "CC_REG", /* CC */		\
 		   "ALL_REGS" }

 #define REG_CLASS_CONTENTS {						\
   {0x00000000,0x00000000},	/* NO_REGS */				\
   {0x00000001,0x00000000},	/* R0_REG */                            \
   {3u << REG_X,0x00000000},     /* POINTER_X_REGS, r26 - r27 */		\
   {3u << REG_Y,0x00000000},     /* POINTER_Y_REGS, r28 - r29 */		\
   {3u << REG_Z,0x00000000},     /* POINTER_Z_REGS, r30 - r31 */		\
   {0x00000000,0x00000003},	/* STACK_REG, STACK */			\
   {(3u << REG_Y) | (3u << REG_Z),					\
      0x00000000},		/* BASE_POINTER_REGS, r28 - r31 */	\
   {(3u << REG_X) | (3u << REG_Y) | (3u << REG_Z),			\
      0x00000000},		/* POINTER_REGS, r26 - r31 */		\
   {(3u << REG_X) | (3u << REG_Y) | (3u << REG_Z) | (3u << REG_W),	\
      0x00000000},		/* ADDW_REGS, r24 - r31 */		\
   {0x00ff0000,0x00000000},	/* SIMPLE_LD_REGS r16 - r23 */          \
   {(3u << REG_X)|(3u << REG_Y)|(3u << REG_Z)|(3u << REG_W)|(0xffu << 16),\
      0x00000000},	/* LD_REGS, r16 - r31 */			\
   {0x0000ffff,0x00000000},	/* NO_LD_REGS  r0 - r15 */              \
   {0xffffffff,0x00000000},	/* GENERAL_REGS, r0 - r31 */		\
   {0x00000000,0x00000010},	/* CC */				\
   {0xffffffff,0x00000013}	/* ALL_REGS */				\
 }

 #define REGNO_REG_CLASS(R) avr_regno_reg_class(R)

 #define MODE_CODE_BASE_REG_CLASS(mode, as, outer_code, index_code)   \
   avr_mode_code_base_reg_class (mode, as, outer_code, index_code)

 #define INDEX_REG_CLASS NO_REGS

 #define REGNO_MODE_CODE_OK_FOR_BASE_P(num, mode, as, outer_code, index_code) \
   avr_regno_mode_code_ok_for_base_p (num, mode, as, outer_code, index_code)

 #define REGNO_OK_FOR_INDEX_P(NUM) 0

 #define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true

 #define STACK_PUSH_CODE POST_DEC

 #define STACK_GROWS_DOWNWARD 1

 #define STACK_POINTER_OFFSET 1

 #define FIRST_PARM_OFFSET(FUNDECL) 0

 #define STACK_BOUNDARY 8

 #define STACK_POINTER_REGNUM 32

 #define FRAME_POINTER_REGNUM REG_Y

 #define ARG_POINTER_REGNUM 34

 #define STATIC_CHAIN_REGNUM ((AVR_TINY) ? 18 :2)

 #define RELOAD_ELIMINABLE_REGS {				\
     { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM },               \
     { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM },               \
     { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM },             \
     { FRAME_POINTER_REGNUM + 1, STACK_POINTER_REGNUM + 1 } }

 #define ELIMINABLE_REGS						\
   {								\
     { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM },		\
     { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM },		\
     { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM }		\
   }

 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)			\
   OFFSET = avr_initial_elimination_offset (FROM, TO)

 #define RETURN_ADDR_RTX(count, tem) avr_return_addr_rtx (count, tem)

 /* Don't use Push rounding. expr.cc: emit_single_push_insn is broken
    for POST_DEC targets (PR27386).  */
 /*#define PUSH_ROUNDING(NPUSHED) (NPUSHED)*/

 typedef struct avr_args
 {
   /* # Registers available for passing */
   int nregs;

   /* Next available register number */
   int regno;

   /* Whether some of the arguments are passed on the stack,
      and hence an arg pointer is needed.  */
   bool has_stack_args;
 } CUMULATIVE_ARGS;

 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
   avr_init_cumulative_args (&(CUM), FNTYPE, LIBNAME, FNDECL)

 #define FUNCTION_ARG_REGNO_P(r) avr_function_arg_regno_p(r)

 #define DEFAULT_PCC_STRUCT_RETURN 0

 #define EPILOGUE_USES(REGNO) avr_epilogue_uses(REGNO)

 #define HAVE_POST_INCREMENT 1
 #define HAVE_PRE_DECREMENT 1

 #define MAX_REGS_PER_ADDRESS 1

 #define LEGITIMIZE_RELOAD_ADDRESS(X,MODE,OPNUM,TYPE,IND_L,WIN)          \
   do {                                                                  \
     rtx new_x = avr_legitimize_reload_address (&(X), MODE, OPNUM, TYPE, \
                                                ADDR_TYPE (TYPE),        \
                                                IND_L, make_memloc);     \
     if (new_x)                                                          \
       {                                                                 \
         X = new_x;                                                      \
         goto WIN;                                                       \
       }                                                                 \
   } while (0)

 /* We increase branch costs after reload in order to keep basic-block
    reordering from introducing out-of-line jumps and to prefer fall-through
    edges instead.  The default branch costs are 0, mainly because otherwise
    do_store_flag might come up with bloated code.  */
 #define BRANCH_COST(speed_p, predictable_p)     \
   (avropt_branch_cost + (reload_completed ? 4 : 0))

 #define SLOW_BYTE_ACCESS 0

 #define NO_FUNCTION_CSE 1

 #define REGISTER_TARGET_PRAGMAS()                                       \
   do {                                                                  \
     avr_register_target_pragmas();                                      \
   } while (0)

 #define TEXT_SECTION_ASM_OP "\t.text"

 #define DATA_SECTION_ASM_OP "\t.data"

 #define BSS_SECTION_ASM_OP "\t.section .bss"

 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
    There are no shared libraries on this target, and these sections are
    placed in the read-only program memory, so they are not writable.  */

 #undef CTORS_SECTION_ASM_OP
 #define CTORS_SECTION_ASM_OP "\t.section .ctors,\"a\",@progbits"

 #undef DTORS_SECTION_ASM_OP
 #define DTORS_SECTION_ASM_OP "\t.section .dtors,\"a\",@progbits"

 #define TARGET_ASM_CONSTRUCTOR avr_asm_out_ctor

 #define TARGET_ASM_DESTRUCTOR avr_asm_out_dtor

 #define SUPPORTS_INIT_PRIORITY 0

 /* We pretend jump tables are in text section because otherwise,
    final.cc will switch to .rodata before jump tables and thereby
    triggers __do_copy_data.  As we implement ASM_OUTPUT_ADDR_VEC,
    we still have full control over the jump tables themselves.  */
 #define JUMP_TABLES_IN_TEXT_SECTION 1

 #define ASM_COMMENT_START " ; "

 #define ASM_APP_ON "/* #APP */\n"

 #define ASM_APP_OFF "/* #NOAPP */\n"

 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) ((C) == '\n' || ((C) == '$'))

 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(STREAM, DECL, NAME, SIZE, ALIGN) \
   avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, false)

 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
   avr_asm_asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN, \
 				  asm_output_aligned_bss)

 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(STREAM, DECL, NAME, SIZE, ALIGN)  \
   avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, true)

 /* Globalizing directive for a label.  */
 #define GLOBAL_ASM_OP ".global\t"

 #define SUPPORTS_WEAK 1

 #define HAS_INIT_SECTION 1

 #define REGISTER_NAMES {				\
   "r0","r1","r2","r3","r4","r5","r6","r7",		\
     "r8","r9","r10","r11","r12","r13","r14","r15",	\
     "r16","r17","r18","r19","r20","r21","r22","r23",	\
     "r24","r25","r26","r27","r28","r29","r30","r31",	\
     "__SP_L__","__SP_H__","argL","argH", "cc"}

 #define FINAL_PRESCAN_INSN(insn, operand, nop)  \
   avr_final_prescan_insn (insn, operand,nop)

 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO)	\
 {						\
   gcc_assert (REGNO < 32);			\
   fprintf (STREAM, "\tpush\tr%d", REGNO);	\
 }

 #define ASM_OUTPUT_REG_POP(STREAM, REGNO)	\
 {						\
   gcc_assert (REGNO < 32);			\
   fprintf (STREAM, "\tpop\tr%d", REGNO);	\
 }

 #define ASM_OUTPUT_ADDR_VEC(TLABEL, TDATA)      \
   avr_output_addr_vec (TLABEL, TDATA)

 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
   do {                                                  \
     if ((POWER) > 0)                                    \
       fprintf (STREAM, "\t.p2align\t%d\n", POWER);      \
   } while (0)

 #define CASE_VECTOR_MODE HImode

 #undef WORD_REGISTER_OPERATIONS

 /* Can move only a single byte from memory to reg in a
    single instruction. */

 #define MOVE_MAX 1

 /* Allow upto two bytes moves to occur using by_pieces
    infrastructure */

 #define MOVE_MAX_PIECES 2

 /* Set MOVE_RATIO to 3 to allow memory moves upto 4 bytes to happen
    by pieces when optimizing for speed, like it did when MOVE_MAX_PIECES
    was 4. When optimizing for size, allow memory moves upto 2 bytes.
    Also see avr_use_by_pieces_infrastructure_p. */

 #define MOVE_RATIO(speed) ((speed) ? 3 : 2)

 #define Pmode HImode

 #define FUNCTION_MODE HImode

 #define DOLLARS_IN_IDENTIFIERS 0

 #define TRAMPOLINE_SIZE 4

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

 #define FUNCTION_PROFILER(FILE, LABELNO)  \
   fprintf (FILE, "/* profiler %d */", (LABELNO))

 #define ADJUST_INSN_LENGTH(INSN, LENGTH)                \
     (LENGTH = avr_adjust_insn_length (INSN, LENGTH))

 extern const char *avr_devicespecs_file (int, const char**);
 extern const char *avr_double_lib (int, const char**);
 extern const char *avr_no_devlib (int, const char**);

 #define EXTRA_SPEC_FUNCTIONS                            \
   { "double-lib", avr_double_lib },                     \
   { "no-devlib", avr_no_devlib },                       \
   { "device-specs-file", avr_devicespecs_file },

 /* Driver self specs has lmited functionality w.r.t. '%s' for dynamic specs.
    Apply '%s' to a static string to inflate the file (directory) name which
    is used to diagnose problems with reading the specs file.  */

 #undef  DRIVER_SELF_SPECS
 #define DRIVER_SELF_SPECS                               \
   " %:double-lib(%{m*:m%*})"                            \
   " %:device-specs-file(device-specs%s %{mmcu=*:%*})"

 /* No libstdc++ for now.  Empty string doesn't work.  */
 #define LIBSTDCXX "gcc"

 /* This is the default without any -mmcu=* option.  */
 #define MULTILIB_DEFAULTS { "mmcu=" AVR_MMCU_DEFAULT }

 #define TEST_HARD_REG_CLASS(CLASS, REGNO) \
   TEST_HARD_REG_BIT (reg_class_contents[ (int) (CLASS)], REGNO)

 #define CR_TAB "\n\t"

 #define DWARF2_ADDR_SIZE 4

 #define INCOMING_RETURN_ADDR_RTX   avr_incoming_return_addr_rtx ()
 #define INCOMING_FRAME_SP_OFFSET   (AVR_3_BYTE_PC ? 3 : 2)

 /* The caller's stack pointer value immediately before the call
    is one byte below the first argument.  */
 #define ARG_POINTER_CFA_OFFSET(FNDECL)  -1

 #define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
   avr_hard_regno_rename_ok (OLD_REG, NEW_REG)

 /* A C structure for machine-specific, per-function data.
    This is added to the cfun structure.  */
 struct GTY(()) machine_function
 {
   /* 'true' - if current function is a naked function.  */
   bool is_naked;

   /* 0 when no "interrupt" attribute is present.
      1 when an "interrupt" attribute without arguments is present (and
 	    perhaps also "interrupt" attributes with argument(s)).
      -1 when "interrupt" attribute(s) with arguments are present but none
      without argument.  */
   int is_interrupt;

   /* 0 when no "signal" attribute is present.
      1 when a "signal" attribute without arguments is present (and
 	    perhaps also "signal" attributes with argument(s)).
      -1 when "signal" attribute(s) with arguments are present but none
      without argument.  */
   int is_signal;

   /* 'true' - if current function is a non-blocking interrupt service
      routine as specified by the "isr_noblock" attribute.  */
   bool is_noblock;

   /* 'true' - if current function is a 'task' function
      as specified by the "OS_task" attribute.  */
   bool is_OS_task;

   /* 'true' - if current function is a 'main' function
      as specified by the "OS_main" attribute.  */
   bool is_OS_main;

   /* Current function stack size.  */
   int stack_usage;

   /* 'true' if a callee might be tail called */
   bool sibcall_fails;

   /* 'true' if the above is_foo predicates are sanity-checked to avoid
      multiple diagnose for the same function.  */
   bool attributes_checked_p;

   /* 'true' - if current function shall not use '__gcc_isr' pseudo
      instructions as specified by the "no_gccisr" attribute.  */
   bool is_no_gccisr;

   /* Used for `__gcc_isr' pseudo instruction handling of
      non-naked ISR prologue / epilogue(s).  */
   struct
   {
     /* 'true' if this function actually uses "*gasisr" insns. */
     bool yes;
     /* 'true' if this function is allowed to use "*gasisr" insns. */
     bool maybe;
     /* The register numer as printed by the Done chunk.  */
     int regno;
   } gasisr;

   /* 'true' if this function references .L__stack_usage like with
      __builtin_return_address.  */
   bool use_L__stack_usage;

   /* Counts how many times the execute() method of the avr-fuse-add pass
      has been invoked.  The count is even increased when the optimization
      itself is not run.  The purpose of this variable is to provide
      information about where in the pass sequence we are.
      It is used in insn / split conditions.  */
   int n_avr_fuse_add_executed;
 };

 /* AVR does not round pushes, but the existence of this macro is
    required in order for pushes to be generated.  */
 #define PUSH_ROUNDING(X)	(X)

 /* Define prototype here to avoid build warning.  Some files using
    ACCUMULATE_OUTGOING_ARGS (directly or indirectly) include
    tm.h but not tm_p.h.  */
 extern int avr_accumulate_outgoing_args (void);
 #define ACCUMULATE_OUTGOING_ARGS avr_accumulate_outgoing_args()

 #define INIT_EXPANDERS avr_init_expanders()

 /* Flags used for io and address attributes.  */
 #define SYMBOL_FLAG_IO_LOW	(SYMBOL_FLAG_MACH_DEP << 4)
 #define SYMBOL_FLAG_IO		(SYMBOL_FLAG_MACH_DEP << 5)
 #define SYMBOL_FLAG_ADDRESS	(SYMBOL_FLAG_MACH_DEP << 6)
	/* Definitions of target machine for GNU compiler,
	for AVR 8-bit microcontrollers.
	Copyright (C) 1998-2025 Free Software Foundation, Inc.
	Contributed by Denis Chertykov (chertykov@gmail.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/>. */

	typedef struct
	{
	/* Id of the address space as used in c_register_addr_space */
	unsigned char id;

	/* Flavour of memory: 0 = RAM, 1 = Flash */
	int memory_class;

	/* Width of pointer (in bytes) */
	int pointer_size;

	/* Name of the address space as visible to the user */
	const char *name;

	/* Segment (i.e. 64k memory chunk) number. */
	int segment;

	/* Section prefix, e.g. ".progmem1.data" */
	const char *section_name;
	} avr_addrspace_t;

	extern const avr_addrspace_t avr_addrspace[];

	/* Known address spaces */

	enum
	{
	ADDR_SPACE_RAM, /* ADDR_SPACE_GENERIC */
	ADDR_SPACE_FLASH,
	ADDR_SPACE_FLASH1,
	ADDR_SPACE_FLASH2,
	ADDR_SPACE_FLASH3,
	ADDR_SPACE_FLASH4,
	ADDR_SPACE_FLASH5,
	ADDR_SPACE_FLASHX,
	ADDR_SPACE_MEMX,
	/* Sentinel */
	ADDR_SPACE_COUNT
	};

	#define TARGET_CPU_CPP_BUILTINS() avr_cpu_cpp_builtins (pfile)

	#define AVR_SHORT_CALLS (TARGET_SHORT_CALLS \
	&& avr_arch == &avr_arch_types[ARCH_AVRXMEGA3])
	#define AVR_HAVE_JMP_CALL (avr_arch->have_jmp_call && ! AVR_SHORT_CALLS)
	#define AVR_HAVE_MUL (avr_arch->have_mul)
	#define AVR_HAVE_MOVW (avr_arch->have_movw_lpmx)
	#define AVR_HAVE_ADIW (!AVR_TINY)
	#define AVR_HAVE_LPM (!AVR_TINY)
	#define AVR_HAVE_LPMX (avr_arch->have_movw_lpmx)
	#define AVR_HAVE_ELPM (avr_arch->have_elpm)
	#define AVR_HAVE_ELPMX (avr_arch->have_elpmx)
	#define AVR_HAVE_RAMPD (avr_arch->have_rampd)
	#define AVR_HAVE_RAMPX (avr_arch->have_rampd)
	#define AVR_HAVE_RAMPY (avr_arch->have_rampd)
	#define AVR_HAVE_RAMPZ (avr_arch->have_elpm \
	\|\| avr_arch->have_rampd)
	#define AVR_HAVE_EIJMP_EICALL (avr_arch->have_eijmp_eicall)

	/* Handling of 8-bit SP versus 16-bit SP is as follows:

	FIXME: DRIVER_SELF_SPECS has changed.
	-msp8 is used internally to select the right multilib for targets with
	8-bit SP. -msp8 is set automatically by DRIVER_SELF_SPECS for devices
	with 8-bit SP or by multilib generation machinery. If a frame pointer is
	needed and SP is only 8 bits wide, SP is zero-extended to get FP.

	TARGET_TINY_STACK is triggered by -mtiny-stack which is a user option.
	This option has no effect on multilib selection. It serves to save some
	bytes on 16-bit SP devices by only changing SP_L and leaving SP_H alone.

	These two properties are reflected by built-in macros __AVR_SP8__ resp.
	__AVR_HAVE_8BIT_SP__ and __AVR_HAVE_16BIT_SP__. During multilib generation
	there is always __AVR_SP8__ == __AVR_HAVE_8BIT_SP__. */

	#define AVR_HAVE_8BIT_SP \
	(TARGET_TINY_STACK \|\| avropt_sp8)

	#define AVR_HAVE_SPH (!avropt_sp8)

	#define AVR_2_BYTE_PC (!AVR_HAVE_EIJMP_EICALL)
	#define AVR_3_BYTE_PC (AVR_HAVE_EIJMP_EICALL)

	#define AVR_XMEGA (avr_arch->xmega_p)
	#define AVR_TINY (avr_arch->tiny_p)

	#define BITS_BIG_ENDIAN 0
	#define BYTES_BIG_ENDIAN 0
	#define WORDS_BIG_ENDIAN 0

	#define FLOAT_LIB_COMPARE_RETURNS_BOOL(mode, comparison) \
	avr_float_lib_compare_returns_bool (mode, comparison)

	#ifdef IN_LIBGCC2
	/* This is to get correct SI and DI modes in libgcc2.c (32 and 64 bits). */
	#define UNITS_PER_WORD 4
	#else
	/* Width of a word, in units (bytes). */
	#define UNITS_PER_WORD 1
	#endif

	#define POINTER_SIZE 16


	/* Maximum sized of reasonable data type
	DImode or Dfmode ... */
	#define MAX_FIXED_MODE_SIZE 32

	#define PARM_BOUNDARY 8

	#define FUNCTION_BOUNDARY 8

	#define EMPTY_FIELD_BOUNDARY 8

	/* No data type wants to be aligned rounder than this. */
	#define BIGGEST_ALIGNMENT 8

	#define TARGET_VTABLE_ENTRY_ALIGN 8

	#define STRICT_ALIGNMENT 0

	#define INT_TYPE_SIZE (TARGET_INT8 ? 8 : 16)
	#define SHORT_TYPE_SIZE (INT_TYPE_SIZE == 8 ? INT_TYPE_SIZE : 16)
	#define LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 16 : 32)
	#define LONG_LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 32 : 64)

	#define LONG_LONG_ACCUM_TYPE_SIZE 64

	#define DEFAULT_SIGNED_CHAR 1

	#define SIZE_TYPE (INT_TYPE_SIZE == 8 ? "long unsigned int" : "unsigned int")
	#define PTRDIFF_TYPE (INT_TYPE_SIZE == 8 ? "long int" :"int")

	#define WCHAR_TYPE_SIZE 16

	#define FIRST_PSEUDO_REGISTER 37

	#define GENERAL_REGNO_P(N) IN_RANGE (N, 2, 31)
	#define GENERAL_REG_P(X) (REG_P (X) && GENERAL_REGNO_P (REGNO (X)))

	#define FIXED_REGISTERS {\
	1,1,/* r0 r1 */\
	0,0,/* r2 r3 */\
	0,0,/* r4 r5 */\
	0,0,/* r6 r7 */\
	0,0,/* r8 r9 */\
	0,0,/* r10 r11 */\
	0,0,/* r12 r13 */\
	0,0,/* r14 r15 */\
	0,0,/* r16 r17 */\
	0,0,/* r18 r19 */\
	0,0,/* r20 r21 */\
	0,0,/* r22 r23 */\
	0,0,/* r24 r25 */\
	0,0,/* r26 r27 */\
	0,0,/* r28 r29 */\
	0,0,/* r30 r31 */\
	1,1,/* STACK */\
	1,1, /* arg pointer */ \
	1 /* CC */ }

	#define CALL_USED_REGISTERS { \
	1,1,/* r0 r1 */ \
	0,0,/* r2 r3 */ \
	0,0,/* r4 r5 */ \
	0,0,/* r6 r7 */ \
	0,0,/* r8 r9 */ \
	0,0,/* r10 r11 */ \
	0,0,/* r12 r13 */ \
	0,0,/* r14 r15 */ \
	0,0,/* r16 r17 */ \
	1,1,/* r18 r19 */ \
	1,1,/* r20 r21 */ \
	1,1,/* r22 r23 */ \
	1,1,/* r24 r25 */ \
	1,1,/* r26 r27 */ \
	0,0,/* r28 r29 */ \
	1,1,/* r30 r31 */ \
	1,1,/* STACK */ \
	1,1, /* arg pointer */ \
	1 /* CC */ }

	#define REG_ALLOC_ORDER { \
	24,25, \
	18,19, \
	20,21, \
	22,23, \
	30,31, \
	26,27, \
	28,29, \
	17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2, \
	0,1, \
	32,33,34,35,36 \
	}

	#define ADJUST_REG_ALLOC_ORDER avr_adjust_reg_alloc_order()


	enum reg_class {
	NO_REGS,
	R0_REG, /* r0 */
	POINTER_X_REGS, /* r26 - r27 */
	POINTER_Y_REGS, /* r28 - r29 */
	POINTER_Z_REGS, /* r30 - r31 */
	STACK_REG, /* STACK */
	BASE_POINTER_REGS, /* r28 - r31 */
	POINTER_REGS, /* r26 - r31 */
	ADDW_REGS, /* r24 - r31 */
	SIMPLE_LD_REGS, /* r16 - r23 */
	LD_REGS, /* r16 - r31 */
	NO_LD_REGS, /* r0 - r15 */
	GENERAL_REGS, /* r0 - r31 */
	CC_REG, /* CC */
	ALL_REGS, LIM_REG_CLASSES
	};


	#define N_REG_CLASSES (int)LIM_REG_CLASSES

	#define REG_CLASS_NAMES { \
	"NO_REGS", \
	"R0_REG", /* r0 */ \
	"POINTER_X_REGS", /* r26 - r27 */ \
	"POINTER_Y_REGS", /* r28 - r29 */ \
	"POINTER_Z_REGS", /* r30 - r31 */ \
	"STACK_REG", /* STACK */ \
	"BASE_POINTER_REGS", /* r28 - r31 */ \
	"POINTER_REGS", /* r26 - r31 */ \
	"ADDW_REGS", /* r24 - r31 */ \
	"SIMPLE_LD_REGS", /* r16 - r23 */ \
	"LD_REGS", /* r16 - r31 */ \
	"NO_LD_REGS", /* r0 - r15 */ \
	"GENERAL_REGS", /* r0 - r31 */ \
	"CC_REG", /* CC */ \
	"ALL_REGS" }

	#define REG_CLASS_CONTENTS { \
	{0x00000000,0x00000000}, /* NO_REGS */ \
	{0x00000001,0x00000000}, /* R0_REG */ \
	{3u << REG_X,0x00000000}, /* POINTER_X_REGS, r26 - r27 */ \
	{3u << REG_Y,0x00000000}, /* POINTER_Y_REGS, r28 - r29 */ \
	{3u << REG_Z,0x00000000}, /* POINTER_Z_REGS, r30 - r31 */ \
	{0x00000000,0x00000003}, /* STACK_REG, STACK */ \
	{(3u << REG_Y) \| (3u << REG_Z), \
	0x00000000}, /* BASE_POINTER_REGS, r28 - r31 */ \
	{(3u << REG_X) \| (3u << REG_Y) \| (3u << REG_Z), \
	0x00000000}, /* POINTER_REGS, r26 - r31 */ \
	{(3u << REG_X) \| (3u << REG_Y) \| (3u << REG_Z) \| (3u << REG_W), \
	0x00000000}, /* ADDW_REGS, r24 - r31 */ \
	{0x00ff0000,0x00000000}, /* SIMPLE_LD_REGS r16 - r23 */ \
	{(3u << REG_X)\|(3u << REG_Y)\|(3u << REG_Z)\|(3u << REG_W)\|(0xffu << 16),\
	0x00000000}, /* LD_REGS, r16 - r31 */ \
	{0x0000ffff,0x00000000}, /* NO_LD_REGS r0 - r15 */ \
	{0xffffffff,0x00000000}, /* GENERAL_REGS, r0 - r31 */ \
	{0x00000000,0x00000010}, /* CC */ \
	{0xffffffff,0x00000013} /* ALL_REGS */ \
	}

	#define REGNO_REG_CLASS(R) avr_regno_reg_class(R)

	#define MODE_CODE_BASE_REG_CLASS(mode, as, outer_code, index_code) \
	avr_mode_code_base_reg_class (mode, as, outer_code, index_code)

	#define INDEX_REG_CLASS NO_REGS

	#define REGNO_MODE_CODE_OK_FOR_BASE_P(num, mode, as, outer_code, index_code) \
	avr_regno_mode_code_ok_for_base_p (num, mode, as, outer_code, index_code)

	#define REGNO_OK_FOR_INDEX_P(NUM) 0

	#define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true

	#define STACK_PUSH_CODE POST_DEC

	#define STACK_GROWS_DOWNWARD 1

	#define STACK_POINTER_OFFSET 1

	#define FIRST_PARM_OFFSET(FUNDECL) 0

	#define STACK_BOUNDARY 8

	#define STACK_POINTER_REGNUM 32

	#define FRAME_POINTER_REGNUM REG_Y

	#define ARG_POINTER_REGNUM 34

	#define STATIC_CHAIN_REGNUM ((AVR_TINY) ? 18 :2)

	#define RELOAD_ELIMINABLE_REGS { \
	{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM }, \
	{ ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM }, \
	{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM }, \
	{ FRAME_POINTER_REGNUM + 1, STACK_POINTER_REGNUM + 1 } }

	#define ELIMINABLE_REGS \
	{ \
	{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM }, \
	{ ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM }, \
	{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM } \
	}

	#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
	OFFSET = avr_initial_elimination_offset (FROM, TO)

	#define RETURN_ADDR_RTX(count, tem) avr_return_addr_rtx (count, tem)

	/* Don't use Push rounding. expr.cc: emit_single_push_insn is broken
	for POST_DEC targets (PR27386). */
	/#define PUSH_ROUNDING(NPUSHED) (NPUSHED)/

	typedef struct avr_args
	{
	/* # Registers available for passing */
	int nregs;

	/* Next available register number */
	int regno;

	/* Whether some of the arguments are passed on the stack,
	and hence an arg pointer is needed. */
	bool has_stack_args;
	} CUMULATIVE_ARGS;

	#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
	avr_init_cumulative_args (&(CUM), FNTYPE, LIBNAME, FNDECL)

	#define FUNCTION_ARG_REGNO_P(r) avr_function_arg_regno_p(r)

	#define DEFAULT_PCC_STRUCT_RETURN 0

	#define EPILOGUE_USES(REGNO) avr_epilogue_uses(REGNO)

	#define HAVE_POST_INCREMENT 1
	#define HAVE_PRE_DECREMENT 1

	#define MAX_REGS_PER_ADDRESS 1

	#define LEGITIMIZE_RELOAD_ADDRESS(X,MODE,OPNUM,TYPE,IND_L,WIN) \
	do { \
	rtx new_x = avr_legitimize_reload_address (&(X), MODE, OPNUM, TYPE, \
	ADDR_TYPE (TYPE), \
	IND_L, make_memloc); \
	if (new_x) \
	{ \
	X = new_x; \
	goto WIN; \
	} \
	} while (0)

	/* We increase branch costs after reload in order to keep basic-block
	reordering from introducing out-of-line jumps and to prefer fall-through
	edges instead. The default branch costs are 0, mainly because otherwise
	do_store_flag might come up with bloated code. */
	#define BRANCH_COST(speed_p, predictable_p) \
	(avropt_branch_cost + (reload_completed ? 4 : 0))

	#define SLOW_BYTE_ACCESS 0

	#define NO_FUNCTION_CSE 1

	#define REGISTER_TARGET_PRAGMAS() \
	do { \
	avr_register_target_pragmas(); \
	} while (0)

	#define TEXT_SECTION_ASM_OP "\t.text"

	#define DATA_SECTION_ASM_OP "\t.data"

	#define BSS_SECTION_ASM_OP "\t.section .bss"

	/* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
	There are no shared libraries on this target, and these sections are
	placed in the read-only program memory, so they are not writable. */

	#undef CTORS_SECTION_ASM_OP
	#define CTORS_SECTION_ASM_OP "\t.section .ctors,\"a\",@progbits"

	#undef DTORS_SECTION_ASM_OP
	#define DTORS_SECTION_ASM_OP "\t.section .dtors,\"a\",@progbits"

	#define TARGET_ASM_CONSTRUCTOR avr_asm_out_ctor

	#define TARGET_ASM_DESTRUCTOR avr_asm_out_dtor

	#define SUPPORTS_INIT_PRIORITY 0

	/* We pretend jump tables are in text section because otherwise,
	final.cc will switch to .rodata before jump tables and thereby
	triggers __do_copy_data. As we implement ASM_OUTPUT_ADDR_VEC,
	we still have full control over the jump tables themselves. */
	#define JUMP_TABLES_IN_TEXT_SECTION 1

	#define ASM_COMMENT_START " ; "

	#define ASM_APP_ON "/* #APP */\n"

	#define ASM_APP_OFF "/* #NOAPP */\n"

	#define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) ((C) == '\n' \|\| ((C) == '$'))

	#define ASM_OUTPUT_ALIGNED_DECL_COMMON(STREAM, DECL, NAME, SIZE, ALIGN) \
	avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, false)

	#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
	avr_asm_asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN, \
	asm_output_aligned_bss)

	#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(STREAM, DECL, NAME, SIZE, ALIGN) \
	avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, true)

	/* Globalizing directive for a label. */
	#define GLOBAL_ASM_OP ".global\t"

	#define SUPPORTS_WEAK 1

	#define HAS_INIT_SECTION 1

	#define REGISTER_NAMES { \
	"r0","r1","r2","r3","r4","r5","r6","r7", \
	"r8","r9","r10","r11","r12","r13","r14","r15", \
	"r16","r17","r18","r19","r20","r21","r22","r23", \
	"r24","r25","r26","r27","r28","r29","r30","r31", \
	"__SP_L__","__SP_H__","argL","argH", "cc"}

	#define FINAL_PRESCAN_INSN(insn, operand, nop) \
	avr_final_prescan_insn (insn, operand,nop)

	#define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
	{ \
	gcc_assert (REGNO < 32); \
	fprintf (STREAM, "\tpush\tr%d", REGNO); \
	}

	#define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
	{ \
	gcc_assert (REGNO < 32); \
	fprintf (STREAM, "\tpop\tr%d", REGNO); \
	}

	#define ASM_OUTPUT_ADDR_VEC(TLABEL, TDATA) \
	avr_output_addr_vec (TLABEL, TDATA)

	#define ASM_OUTPUT_ALIGN(STREAM, POWER) \
	do { \
	if ((POWER) > 0) \
	fprintf (STREAM, "\t.p2align\t%d\n", POWER); \
	} while (0)

	#define CASE_VECTOR_MODE HImode

	#undef WORD_REGISTER_OPERATIONS

	/* Can move only a single byte from memory to reg in a
	single instruction. */

	#define MOVE_MAX 1

	/* Allow upto two bytes moves to occur using by_pieces
	infrastructure */

	#define MOVE_MAX_PIECES 2

	/* Set MOVE_RATIO to 3 to allow memory moves upto 4 bytes to happen
	by pieces when optimizing for speed, like it did when MOVE_MAX_PIECES
	was 4. When optimizing for size, allow memory moves upto 2 bytes.
	Also see avr_use_by_pieces_infrastructure_p. */

	#define MOVE_RATIO(speed) ((speed) ? 3 : 2)

	#define Pmode HImode

	#define FUNCTION_MODE HImode

	#define DOLLARS_IN_IDENTIFIERS 0

	#define TRAMPOLINE_SIZE 4

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

	#define FUNCTION_PROFILER(FILE, LABELNO) \
	fprintf (FILE, "/* profiler %d */", (LABELNO))

	#define ADJUST_INSN_LENGTH(INSN, LENGTH) \
	(LENGTH = avr_adjust_insn_length (INSN, LENGTH))

	extern const char avr_devicespecs_file (int, const char*);
	extern const char avr_double_lib (int, const char*);
	extern const char avr_no_devlib (int, const char*);

	#define EXTRA_SPEC_FUNCTIONS \
	{ "double-lib", avr_double_lib }, \
	{ "no-devlib", avr_no_devlib }, \
	{ "device-specs-file", avr_devicespecs_file },

	/* Driver self specs has lmited functionality w.r.t. '%s' for dynamic specs.
	Apply '%s' to a static string to inflate the file (directory) name which
	is used to diagnose problems with reading the specs file. */

	#undef DRIVER_SELF_SPECS
	#define DRIVER_SELF_SPECS \
	" %:double-lib(%{m:m%})" \
	" %:device-specs-file(device-specs%s %{mmcu=:%})"

	/* No libstdc++ for now. Empty string doesn't work. */
	#define LIBSTDCXX "gcc"

	/* This is the default without any -mmcu=* option. */
	#define MULTILIB_DEFAULTS { "mmcu=" AVR_MMCU_DEFAULT }

	#define TEST_HARD_REG_CLASS(CLASS, REGNO) \
	TEST_HARD_REG_BIT (reg_class_contents[ (int) (CLASS)], REGNO)

	#define CR_TAB "\n\t"

	#define DWARF2_ADDR_SIZE 4

	#define INCOMING_RETURN_ADDR_RTX avr_incoming_return_addr_rtx ()
	#define INCOMING_FRAME_SP_OFFSET (AVR_3_BYTE_PC ? 3 : 2)

	/* The caller's stack pointer value immediately before the call
	is one byte below the first argument. */
	#define ARG_POINTER_CFA_OFFSET(FNDECL) -1

	#define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
	avr_hard_regno_rename_ok (OLD_REG, NEW_REG)

	/* A C structure for machine-specific, per-function data.
	This is added to the cfun structure. */
	struct GTY(()) machine_function
	{
	/* 'true' - if current function is a naked function. */
	bool is_naked;

	/* 0 when no "interrupt" attribute is present.
	1 when an "interrupt" attribute without arguments is present (and
	perhaps also "interrupt" attributes with argument(s)).
	-1 when "interrupt" attribute(s) with arguments are present but none
	without argument. */
	int is_interrupt;

	/* 0 when no "signal" attribute is present.
	1 when a "signal" attribute without arguments is present (and
	perhaps also "signal" attributes with argument(s)).
	-1 when "signal" attribute(s) with arguments are present but none
	without argument. */
	int is_signal;

	/* 'true' - if current function is a non-blocking interrupt service
	routine as specified by the "isr_noblock" attribute. */
	bool is_noblock;

	/* 'true' - if current function is a 'task' function
	as specified by the "OS_task" attribute. */
	bool is_OS_task;

	/* 'true' - if current function is a 'main' function
	as specified by the "OS_main" attribute. */
	bool is_OS_main;

	/* Current function stack size. */
	int stack_usage;

	/* 'true' if a callee might be tail called */
	bool sibcall_fails;

	/* 'true' if the above is_foo predicates are sanity-checked to avoid
	multiple diagnose for the same function. */
	bool attributes_checked_p;

	/* 'true' - if current function shall not use '__gcc_isr' pseudo
	instructions as specified by the "no_gccisr" attribute. */
	bool is_no_gccisr;

	/* Used for `__gcc_isr' pseudo instruction handling of
	non-naked ISR prologue / epilogue(s). */
	struct
	{
	/* 'true' if this function actually uses "gasisr" insns. /
	bool yes;
	/* 'true' if this function is allowed to use "gasisr" insns. /
	bool maybe;
	/* The register numer as printed by the Done chunk. */
	int regno;
	} gasisr;

	/* 'true' if this function references .L__stack_usage like with
	__builtin_return_address. */
	bool use_L__stack_usage;

	/* Counts how many times the execute() method of the avr-fuse-add pass
	has been invoked. The count is even increased when the optimization
	itself is not run. The purpose of this variable is to provide
	information about where in the pass sequence we are.
	It is used in insn / split conditions. */
	int n_avr_fuse_add_executed;
	};

	/* AVR does not round pushes, but the existence of this macro is
	required in order for pushes to be generated. */
	#define PUSH_ROUNDING(X) (X)

	/* Define prototype here to avoid build warning. Some files using
	ACCUMULATE_OUTGOING_ARGS (directly or indirectly) include
	tm.h but not tm_p.h. */
	extern int avr_accumulate_outgoing_args (void);
	#define ACCUMULATE_OUTGOING_ARGS avr_accumulate_outgoing_args()

	#define INIT_EXPANDERS avr_init_expanders()

	/* Flags used for io and address attributes. */
	#define SYMBOL_FLAG_IO_LOW (SYMBOL_FLAG_MACH_DEP << 4)
	#define SYMBOL_FLAG_IO (SYMBOL_FLAG_MACH_DEP << 5)
	#define SYMBOL_FLAG_ADDRESS (SYMBOL_FLAG_MACH_DEP << 6)