rs6000.h

linux下的gcc编译器

/* This is meant to be redefined in the host dependent files */
#define SUBTARGET_SWITCHES

/* Processor type.  Order must match cpu attribute in MD file.  */
enum processor_type
 {
   PROCESSOR_RIOS1,
   PROCESSOR_RIOS2,
   PROCESSOR_RS64A,
   PROCESSOR_MPCCORE,
   PROCESSOR_PPC403,
   PROCESSOR_PPC405,
   PROCESSOR_PPC601,
   PROCESSOR_PPC603,
   PROCESSOR_PPC604,
   PROCESSOR_PPC604e,
   PROCESSOR_PPC620,
   PROCESSOR_PPC630,
   PROCESSOR_PPC750,
   PROCESSOR_PPC7400,
   PROCESSOR_PPC7450,
   PROCESSOR_PPC8540,
   PROCESSOR_POWER4
};

extern enum processor_type rs6000_cpu;

/* Recast the processor type to the cpu attribute.  */
#define rs6000_cpu_attr ((enum attr_cpu)rs6000_cpu)

/* Define generic processor types based upon current deployment.  */
#define PROCESSOR_COMMON    PROCESSOR_PPC601
#define PROCESSOR_POWER     PROCESSOR_RIOS1
#define PROCESSOR_POWERPC   PROCESSOR_PPC604
#define PROCESSOR_POWERPC64 PROCESSOR_RS64A

/* Define the default processor.  This is overridden by other tm.h files.  */
#define PROCESSOR_DEFAULT   PROCESSOR_RIOS1
#define PROCESSOR_DEFAULT64 PROCESSOR_RS64A

/* Specify the dialect of assembler to use.  New mnemonics is dialect one
   and the old mnemonics are dialect zero.  */
#define ASSEMBLER_DIALECT (TARGET_NEW_MNEMONICS ? 1 : 0)

/* This is meant to be overridden in target specific files.  */
#define	SUBTARGET_OPTIONS

#define TARGET_OPTIONS							\
{									\
   {"cpu=",  &rs6000_select[1].string,					\
    N_("Use features of and schedule code for given CPU") },		\
   {"tune=", &rs6000_select[2].string,					\
    N_("Schedule code for given CPU") },				\
   {"debug=", &rs6000_debug_name, N_("Enable debug output") },		\
   {"traceback=", &rs6000_traceback_name,				\
    N_("Select full, part, or no traceback table") },			\
   {"abi=", &rs6000_abi_string, N_("Specify ABI to use") },		\
   {"long-double-", &rs6000_long_double_size_string,			\
    N_("Specify size of long double (64 or 128 bits)") },		\
   {"isel=", &rs6000_isel_string,                                       \
    N_("Specify yes/no if isel instructions should be generated") },    \
   {"vrsave=", &rs6000_altivec_vrsave_string,                         \
    N_("Specify yes/no if VRSAVE instructions should be generated for AltiVec") }, \
   {"longcall", &rs6000_longcall_switch,				\
    N_("Avoid all range limits on call instructions") },		\
   {"no-longcall", &rs6000_longcall_switch, "" },			\
   SUBTARGET_OPTIONS							\
}

/* rs6000_select[0] is reserved for the default cpu defined via --with-cpu */
struct rs6000_cpu_select
{
  const char *string;
  const char *name;
  int set_tune_p;
  int set_arch_p;
};

extern struct rs6000_cpu_select rs6000_select[];

/* Debug support */
extern const char *rs6000_debug_name;	/* Name for -mdebug-xxxx option */
extern const char *rs6000_abi_string;	/* for -mabi={sysv,darwin,eabi,aix,altivec} */
extern int rs6000_debug_stack;		/* debug stack applications */
extern int rs6000_debug_arg;		/* debug argument handling */

#define	TARGET_DEBUG_STACK	rs6000_debug_stack
#define	TARGET_DEBUG_ARG	rs6000_debug_arg

extern const char *rs6000_traceback_name; /* Type of traceback table.  */

/* These are separate from target_flags because we've run out of bits
   there.  */
extern const char *rs6000_long_double_size_string;
extern int rs6000_long_double_type_size;
extern int rs6000_altivec_abi;
extern int rs6000_spe_abi;
extern int rs6000_isel;
extern int rs6000_fprs;
extern const char *rs6000_isel_string;
extern const char *rs6000_altivec_vrsave_string;
extern int rs6000_altivec_vrsave;
extern const char *rs6000_longcall_switch;
extern int rs6000_default_long_calls;

#define TARGET_LONG_DOUBLE_128 (rs6000_long_double_type_size == 128)
#define TARGET_ALTIVEC_ABI rs6000_altivec_abi
#define TARGET_ALTIVEC_VRSAVE rs6000_altivec_vrsave

#define TARGET_SPE_ABI 0
#define TARGET_SPE 0
#define TARGET_ISEL 0
#define TARGET_FPRS 1

/* Sometimes certain combinations of command options do not make sense
   on a particular target machine.  You can define a macro
   `OVERRIDE_OPTIONS' to take account of this.  This macro, if
   defined, is executed once just after all the command options have
   been parsed.

   Don't use this macro to turn on various extra optimizations for
   `-O'.  That is what `OPTIMIZATION_OPTIONS' is for.

   On the RS/6000 this is used to define the target cpu type.  */

#define OVERRIDE_OPTIONS rs6000_override_options (TARGET_CPU_DEFAULT)

/* Define this to change the optimizations performed by default.  */
#define OPTIMIZATION_OPTIONS(LEVEL,SIZE) optimization_options(LEVEL,SIZE)

/* Show we can debug even without a frame pointer.  */
#define CAN_DEBUG_WITHOUT_FP

/* Target pragma.  */
#define REGISTER_TARGET_PRAGMAS(PFILE) do { \
  cpp_register_pragma (PFILE, 0, "longcall", rs6000_pragma_longcall); \
} while (0)

/* Target #defines.  */
#define TARGET_CPU_CPP_BUILTINS() \
  rs6000_cpu_cpp_builtins (pfile)

/* This is used by rs6000_cpu_cpp_builtins to indicate the byte order
   we're compiling for.  Some configurations may need to override it.  */
#define RS6000_CPU_CPP_ENDIAN_BUILTINS()	\
  do						\
    {						\
      if (BYTES_BIG_ENDIAN)			\
	{					\
	  builtin_define ("__BIG_ENDIAN__");	\
	  builtin_define ("_BIG_ENDIAN");	\
	  builtin_assert ("machine=bigendian");	\
	}					\
      else					\
	{					\
	  builtin_define ("__LITTLE_ENDIAN__");	\
	  builtin_define ("_LITTLE_ENDIAN");	\
	  builtin_assert ("machine=littleendian"); \
	}					\
    }						\
  while (0)

/* Target machine storage layout.  */

/* 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) < UNITS_PER_WORD) \
    (MODE) = word_mode;

/* Define this if function arguments should also be promoted using the above
   procedure.  */

#define PROMOTE_FUNCTION_ARGS

/* Likewise, if the function return value is promoted.  */

#define PROMOTE_FUNCTION_RETURN

/* Define this if most significant bit is lowest numbered
   in instructions that operate on numbered bit-fields.  */
/* That is true on RS/6000.  */
#define BITS_BIG_ENDIAN 1

/* Define this if most significant byte of a word is the lowest numbered.  */
/* That is true on RS/6000.  */
#define BYTES_BIG_ENDIAN 1

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

   For RS/6000 we can decide arbitrarily since there are no machine
   instructions for them.  Might as well be consistent with bits and bytes.  */
#define WORDS_BIG_ENDIAN 1

#define MAX_BITS_PER_WORD 64

/* Width of a word, in units (bytes).  */
#define UNITS_PER_WORD (! TARGET_POWERPC64 ? 4 : 8)
#ifdef IN_LIBGCC2
#define MIN_UNITS_PER_WORD UNITS_PER_WORD
#else
#define MIN_UNITS_PER_WORD 4
#endif
#define UNITS_PER_FP_WORD 8
#define UNITS_PER_ALTIVEC_WORD 16
#define UNITS_PER_SPE_WORD 8

/* Type used for ptrdiff_t, as a string used in a declaration.  */
#define PTRDIFF_TYPE "int"

/* Type used for size_t, as a string used in a declaration.  */
#define SIZE_TYPE "long unsigned int"

/* Type used for wchar_t, as a string used in a declaration.  */
#define WCHAR_TYPE "short unsigned int"

/* Width of wchar_t in bits.  */
#define WCHAR_TYPE_SIZE 16

/* A C expression for the size in bits of the type `short' on the
   target machine.  If you don't define this, the default is half a
   word.  (If this would be less than one storage unit, it is
   rounded up to one unit.)  */
#define SHORT_TYPE_SIZE 16

/* A C expression for the size in bits of the type `int' on the
   target machine.  If you don't define this, the default is one
   word.  */
#define INT_TYPE_SIZE 32

/* A C expression for the size in bits of the type `long' on the
   target machine.  If you don't define this, the default is one
   word.  */
#define LONG_TYPE_SIZE (TARGET_32BIT ? 32 : 64)
#define MAX_LONG_TYPE_SIZE 64

/* A C expression for the size in bits of the type `long long' on the
   target machine.  If you don't define this, the default is two
   words.  */
#define LONG_LONG_TYPE_SIZE 64

/* A C expression for the size in bits of the type `float' on the
   target machine.  If you don't define this, the default is one
   word.  */
#define FLOAT_TYPE_SIZE 32

/* A C expression for the size in bits of the type `double' on the
   target machine.  If you don't define this, the default is two
   words.  */
#define DOUBLE_TYPE_SIZE 64

/* A C expression for the size in bits of the type `long double' on
   the target machine.  If you don't define this, the default is two
   words.  */
#define LONG_DOUBLE_TYPE_SIZE rs6000_long_double_type_size

/* Constant which presents upper bound of the above value.  */
#define MAX_LONG_DOUBLE_TYPE_SIZE 128

/* 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 rs6000_long_double_type_size dependency in ada/targtyps.c.  */
#define WIDEST_HARDWARE_FP_SIZE 64

/* Width in bits of a pointer.
   See also the macro `Pmode' defined below.  */
#define POINTER_SIZE (TARGET_32BIT ? 32 : 64)

/* Allocation boundary (in *bits*) for storing arguments in argument list.  */
#define PARM_BOUNDARY (TARGET_32BIT ? 32 : 64)

/* Boundary (in *bits*) on which stack pointer should be aligned.  */
#define STACK_BOUNDARY ((TARGET_32BIT && !TARGET_ALTIVEC_ABI) ? 64 : 128)

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

/* No data type wants to be aligned rounder than this.  */
#define BIGGEST_ALIGNMENT 128

/* A C expression to compute the alignment for a variables in the
   local store.  TYPE is the data type, and ALIGN is the alignment
   that the object would ordinarily have.  */
#define LOCAL_ALIGNMENT(TYPE, ALIGN)				\
  ((TARGET_ALTIVEC && TREE_CODE (TYPE) == VECTOR_TYPE) ? 128 :	\
    (TARGET_SPE && TREE_CODE (TYPE) == VECTOR_TYPE) ? 64 : ALIGN)

/* 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

/* Return 1 if a structure or array containing FIELD should be
   accessed using `BLKMODE'.

   For the SPE, simd types are V2SI, and gcc can be tempted to put the
   entire thing in a DI and use subregs to access the internals.
   store_bit_field() will force (subreg:DI (reg:V2SI x))'s to the
   back-end.  Because a single GPR can hold a V2SI, but not a DI, the
   best thing to do is set structs to BLKmode and avoid Severe Tire
   Damage.  */
#define MEMBER_TYPE_FORCES_BLK(FIELD, MODE) \
  (TARGET_SPE && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)

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

/* Make strings word-aligned so strcpy from constants will be faster.
   Make vector constants quadword aligned.  */
#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.
   Align vectors to 128 bits.  */
#define DATA_ALIGNMENT(TYPE, ALIGN)		\
  (TREE_CODE (TYPE) == VECTOR_TYPE ? (TARGET_SPE_ABI ? 64 : 128)	\
   : TREE_CODE (TYPE) == ARRAY_TYPE		\
   && TYPE_MODE (TREE_TYPE (TYPE)) == QImode	\
   && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))

/* Nonzero if move instructions will actually fail to work
   when given unaligned data.  */
#define STRICT_ALIGNMENT 0