/* Target definitions for PowerPC running Darwin (Mac OS X).
   Copyright (C) 1997, 2000, 2001 Free Software Foundation, Inc.
   Contributed by Apple Computer Inc.

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.  */

#undef  TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (Darwin/PowerPC)");

/* The "Darwin ABI" is mostly like AIX, but with some key differences.  */

#define DEFAULT_ABI ABI_DARWIN

/* The object file format is Mach-O.  */

#define TARGET_OBJECT_FORMAT OBJECT_MACHO

/* We're not ever going to do TOCs.  */

#define TARGET_TOC 0
#define TARGET_NO_TOC 1

/* APPLE LOCAL RS6000_LONG_BRANCH */
#define RS6000_LONG_BRANCH (1)
#define OUTPUT_COMPILER_STUB (1)

/* The Darwin ABI always includes AltiVec, can't be (validly) turned
   off.  */

#define SUBTARGET_OVERRIDE_OPTIONS  \
  /* APPLE LOCAL begin -malign-mac68k sts */ \
  do {						\
    rs6000_altivec_abi = 1;			\
  } while (0)
/* APPLE LOCAL end -malign-mac68k sts */

#define CPP_PREDEFINES "-D__ppc__ -D__POWERPC__ -D__NATURAL_ALIGNMENT__ -D__MACH__ -D__BIG_ENDIAN__ -D__APPLE__"

/* We want -fPIC by default, unless we're using -static to compile for
   the kernel or some such.  */

/* APPLE LOCAL  dynamic-no-pic  */
/* APPLE LOCAL  Altivec */
#define CC1_SPEC "%{!static:%{!mdynamic-no-pic:-fPIC}} %{faltivec:-D__VEC__=10206 -D__ALTIVEC__=1}"

/* APPLE LOCAL Altivec */
#define CPP_ALTIVEC_SPEC "%{faltivec:-D__VEC__=10206 -D__ALTIVEC__=1}"

/* Make both r2 and r3 available for allocation.  */
#define FIXED_R2 0
#define FIXED_R13 0

/* Base register for access to local variables of the function.  */

#undef  FRAME_POINTER_REGNUM
#define FRAME_POINTER_REGNUM 30

#undef  PIC_OFFSET_TABLE_REGNUM
#define PIC_OFFSET_TABLE_REGNUM 31

/* Pad the outgoing args area to 16 bytes instead of the usual 8.  */

#undef STARTING_FRAME_OFFSET
#define STARTING_FRAME_OFFSET						\
  (RS6000_ALIGN (current_function_outgoing_args_size			\
   + RS6000_VARARGS_AREA						\
   + RS6000_SAVE_AREA, 16))

#undef STACK_DYNAMIC_OFFSET
#define STACK_DYNAMIC_OFFSET(FUNDECL)					\
  (RS6000_ALIGN (current_function_outgoing_args_size			\
   + (STACK_POINTER_OFFSET), 16))

/* APPLE LOCAL improve performance */
/* Define cutoff for using external functions to save floating point.
   For Darwin, use the function for more than a few registers.  */

#define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) > 60 && (FIRST_REG) < 64)

/* APPLE LOCAL begin AltiVec */
/* Define cutoff for using external functions to save vector registers.  */

#define VECTOR_SAVE_INLINE(FIRST_REG) \
  ((FIRST_REG) >= LAST_ALTIVEC_REGNO - 1 && (FIRST_REG) <= LAST_ALTIVEC_REGNO)

/* vector pixel and vector bool are aliases of other vector types.  */

#define VECTOR_PIXEL_AND_BOOL_NOT_DISTINCT
/* APPLE LOCAL end AltiVec */

/* Always use the "debug" register names, they're what the assembler
   wants to see.  */

#undef REGISTER_NAMES
#define REGISTER_NAMES DEBUG_REGISTER_NAMES

/* This outputs NAME to FILE.  */

#undef  RS6000_OUTPUT_BASENAME
#define RS6000_OUTPUT_BASENAME(FILE, NAME)	\
    assemble_name (FILE, NAME);

/* APPLE LOCAL darwin native */
/* move ASM_OUTPUT_LABEL to generic Darwin */

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

#undef ASM_GLOBALIZE_LABEL
#define ASM_GLOBALIZE_LABEL(FILE,NAME)	\
  do { fputs ("\t.globl ", FILE);	\
       RS6000_OUTPUT_BASENAME (FILE, NAME); putc ('\n', FILE);} while (0)

/* This is how to output an internal label prefix.  rs6000.c uses this
   when generating traceback tables.  */
/* Not really used for Darwin?  */

#undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
#define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)	\
  fprintf (FILE, "%s", PREFIX)

/* APPLE LOCAL darwin native */
/* move TEXT_SECTION_ASM_OP, DATA_SECTION_ASM_OP to generic Darwin */

/* This says how to output an assembler line to define a global common
   symbol.  */
/* ? */
#undef  ASM_OUTPUT_ALIGNED_COMMON
#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)	\
  do { fputs (".comm ", (FILE));			\
       RS6000_OUTPUT_BASENAME ((FILE), (NAME));		\
       fprintf ((FILE), ",%d\n", (SIZE)); } while (0)

/* APPLE LOCAL darwin native */
/* move ASM_OUTPUT_SKIP to generic Darwin */

/* Override the standard rs6000 definition.  */

#undef ASM_COMMENT_START
#define ASM_COMMENT_START ";"

/* APPLE LOCAL don't define SAVE_FP_PREFIX and friends */

/* Generate insns to call the profiler.  */

#define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)

/* Function name to call to do profiling.  */

#define RS6000_MCOUNT "*mcount"

/* Default processor: a G4.  */

#undef PROCESSOR_DEFAULT
#define PROCESSOR_DEFAULT  PROCESSOR_PPC7400

/* Default target flag settings.  Despite the fact that STMW/LMW
   serializes, it's still a big codesize win to use them.  Use FSEL by
   default as well.  */

#undef  TARGET_DEFAULT
#define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
                      | MASK_PPC_GFXOPT)

/* Since Darwin doesn't do TOCs, stub this out.  */

#define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  0

/* Unlike most other PowerPC targets, chars are signed, for
   consistency with other Darwin architectures.  */

#undef DEFAULT_SIGNED_CHAR
#define DEFAULT_SIGNED_CHAR (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.
  
   On the RS/6000, we have to return NO_REGS when we want to reload a
   floating-point CONST_DOUBLE to force it to be copied to memory.

   Don't allow R0 when loading the address of, or otherwise furtling with,
   a SYMBOL_REF.  */

#undef PREFERRED_RELOAD_CLASS
#define PREFERRED_RELOAD_CLASS(X,CLASS)			\
  (((GET_CODE (X) == CONST_DOUBLE			\
    && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT)	\
   ? NO_REGS						\
   : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT 	\
      && (CLASS) == NON_SPECIAL_REGS)			\
   ? GENERAL_REGS					\
   : (GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)	\
   ? BASE_REGS						\
   : (CLASS)))

/* Fix for emit_group_load (): force large constants to be pushed via regs.  */
#define ALWAYS_PUSH_CONSTS_USING_REGS_P		1

/* APPLE LOCAL begin Macintosh alignment 2002-2-26 ff */
/* This now supports the Macintosh power, mac68k, and natural 
   alignment modes.  It now has one more parameter than the standard 
   version of the ADJUST_FIELD_ALIGN macro.  
   
   The macro works as follows: We use the computed alignment of the 
   field if we are in the natural alignment mode or if the field is 
   a vector.  Otherwise, if we are in the mac68k alignment mode, we
   use the minimum of the computed alignment and 16 (pegging at
   2-byte alignment).  If we are in the power mode, we peg at 32
   (word alignment) unless it is the first field of the struct, in 
   which case we use the computed alignment.  */
#undef ADJUST_FIELD_ALIGN
#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED, FIRST_FIELD_P)	\
  (TARGET_ALIGN_NATURAL ? (COMPUTED) :				\
   (((COMPUTED) == RS6000_VECTOR_ALIGNMENT)			\
    ? RS6000_VECTOR_ALIGNMENT					\
    : (MIN ((COMPUTED), 					\
    	    (TARGET_ALIGN_MAC68K ? 16 				\
    	    			 : ((FIRST_FIELD_P) ? (COMPUTED) \
    	    			 		    : 32))))))

#undef ROUND_TYPE_ALIGN
/* Macintosh alignment modes require more complicated handling
   of alignment, so we replace the macro with a call to a
   out-of-line function.  */
union tree_node;
extern unsigned round_type_align (union tree_node*, unsigned, unsigned); /* rs6000.c  */
#define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)	\
  round_type_align(STRUCT, COMPUTED, SPECIFIED)

/* Macros related to the switches that specify the alignment of fields
   within structs.  */
#define MASK_ALIGN_MAC68K       0x04000000
#define MASK_ALIGN_NATURAL      0x08000000
#define TARGET_ALIGN_MAC68K     (target_flags & MASK_ALIGN_MAC68K)
#define TARGET_ALIGN_NATURAL    (target_flags & MASK_ALIGN_NATURAL)

#undef SUBTARGET_SWITCHES
#define SUBTARGET_SWITCHES						\
  {"align-mac68k",      MASK_ALIGN_MAC68K,				\
	N_("Align structs and unions according to mac68k rules")},	\
  {"align-power",       - (MASK_ALIGN_MAC68K | MASK_ALIGN_NATURAL),	\
	N_("Align structs and unions according to PowerPC rules")},	\
  {"align-natural",     MASK_ALIGN_NATURAL,				\
	N_("Align structs and unions according to natural rules")},
/* APPLE LOCAL end Macintosh alignment 2002-2-26 ff */

/* APPLE LOCAL: AltiVec */
#undef DWARF_FRAME_REGISTERS
#define DWARF_FRAME_REGISTERS 110

/* APPLE LOCAL begin */
/* Make sure local alignments come from the type node, not the mode;
   mode-based alignments are wrong for vectors.  */
#undef LOCAL_ALIGNMENT
#define LOCAL_ALIGNMENT(TYPE, ALIGN)	(MAX (ALIGN, TYPE_ALIGN (TYPE)))
/* APPLE LOCAL end */

/* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
   support 64 bit powerpc either, so this just keeps things happy.  */
#define DOUBLE_INT_ASM_OP "\t.quad\t"

/* APPLE LOCAL PFE  */
#ifdef PFE
/* Macro to call darwin_pfe_freeze_thaw_target_additions().  If this macro is
   not defined then the target additions function is never called.  */
#define PFE_TARGET_ADDITIONS(hdr) darwin_pfe_freeze_thaw_target_additions (hdr)
#endif

/* APPLE LOCAL begin branch cost */
#undef BRANCH_COST
/* Better code is generated by saying conditional branches take 1 tick.  */
#define BRANCH_COST	1
/* APPLE LOCAL end branch cost */

/* APPLE LOCAL thunks  */
#define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION) \
  output_mi_thunk (FILE, THUNK_FNDECL, DELTA, FUNCTION)

/* Get HOST_WIDE_INT and CONST_INT to be 32 bits, for compile time
   space/speed.  */
#undef MAX_LONG_TYPE_SIZE
#define MAX_LONG_TYPE_SIZE 32
