frv.h

linux下的gcc编译器

   narrower than `BITS_PER_WORD'.  In most cases, only integer modes should be
   widened because wider-precision floating-point operations are usually more
   expensive than their narrower counterparts.

   For most machines, the macro definition does not change UNSIGNEDP.  However,
   some machines, have instructions that preferentially handle either signed or
   unsigned quantities of certain modes.  For example, on the DEC Alpha, 32-bit
   loads from memory and 32-bit add instructions sign-extend the result to 64
   bits.  On such machines, set UNSIGNEDP according to which kind of extension
   is more efficient.

   Do not define this macro if it would never modify MODE.  */
#define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)	\
  do						\
    {						\
      if (GET_MODE_CLASS (MODE) == MODE_INT	\
	  && GET_MODE_SIZE (MODE) < 4)		\
	(MODE) = SImode;			\
    }						\
  while (0)

/* Normal alignment required for function parameters on the stack, in bits.
   All stack parameters receive at least this much alignment regardless of data
   type.  On most machines, this is the same as the size of an integer.  */
#define PARM_BOUNDARY 32

/* Define this macro if you wish to preserve a certain alignment for the stack
   pointer.  The definition is a C expression for the desired alignment
   (measured in bits).

   If `PUSH_ROUNDING' is not defined, the stack will always be aligned to the
   specified boundary.  If `PUSH_ROUNDING' is defined and specifies a less
   strict alignment than `STACK_BOUNDARY', the stack may be momentarily
   unaligned while pushing arguments.  */
#define STACK_BOUNDARY 64

/* Alignment required for a function entry point, in bits.  */
#define FUNCTION_BOUNDARY 128

/* Biggest alignment that any data type can require on this machine,
   in bits.  */
#define BIGGEST_ALIGNMENT 64

/* @@@ A hack, needed because libobjc wants to use ADJUST_FIELD_ALIGN for
   some reason.  */
#ifdef IN_TARGET_LIBS
#define BIGGEST_FIELD_ALIGNMENT 64
#else
/* An expression for the alignment of a structure field FIELD if the
   alignment computed in the usual way is COMPUTED.  GNU CC uses this
   value instead of the value in `BIGGEST_ALIGNMENT' or
   `BIGGEST_FIELD_ALIGNMENT', if defined, for structure fields only.  */
#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) 				\
  frv_adjust_field_align (FIELD, COMPUTED)
#endif

/* If defined, a C expression to compute the alignment for a static variable.
   TYPE is the data type, and ALIGN is the alignment that the object
   would ordinarily have.  The value of this macro is used instead of that
   alignment to align the object.

   If this macro is not defined, then ALIGN is used.

   One use of this macro is to increase alignment of medium-size data to make
   it all fit in fewer cache lines.  Another is to cause character arrays to be
   word-aligned so that `strcpy' calls that copy constants to character arrays
   can be done inline.  */
#define DATA_ALIGNMENT(TYPE, ALIGN)		\
  (TREE_CODE (TYPE) == ARRAY_TYPE		\
   && TYPE_MODE (TREE_TYPE (TYPE)) == QImode	\
   && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))

/* If defined, a C expression to compute the alignment given to a constant that
   is being placed in memory.  CONSTANT is the constant and ALIGN is the
   alignment that the object would ordinarily have.  The value of this macro is
   used instead of that alignment to align the object.

   If this macro is not defined, then ALIGN is used.

   The typical use of this macro is to increase alignment for string constants
   to be word aligned so that `strcpy' calls that copy constants can be done
   inline.  */
#define CONSTANT_ALIGNMENT(EXP, ALIGN)  \
  (TREE_CODE (EXP) == STRING_CST	\
   && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))

/* Define this macro to be the value 1 if instructions will fail to work if
   given data not on the nominal alignment.  If instructions will merely go
   slower in that case, define this macro as 0.  */
#define STRICT_ALIGNMENT 1

/* Define this if you wish to imitate the way many other C compilers handle
   alignment of bitfields and the structures that contain them.

   The behavior is that the type written for a bit-field (`int', `short', or
   other integer type) imposes an alignment for the entire structure, as if the
   structure really did contain an ordinary field of that type.  In addition,
   the bit-field is placed within the structure so that it would fit within such
   a field, not crossing a boundary for it.

   Thus, on most machines, a bit-field whose type is written as `int' would not
   cross a four-byte boundary, and would force four-byte alignment for the
   whole structure.  (The alignment used may not be four bytes; it is
   controlled by the other alignment parameters.)

   If the macro is defined, its definition should be a C expression; a nonzero
   value for the expression enables this behavior.

   Note that if this macro is not defined, or its value is zero, some bitfields
   may cross more than one alignment boundary.  The compiler can support such
   references if there are `insv', `extv', and `extzv' insns that can directly
   reference memory.

   The other known way of making bitfields work is to define
   `STRUCTURE_SIZE_BOUNDARY' as large as `BIGGEST_ALIGNMENT'.  Then every
   structure can be accessed with fullwords.

   Unless the machine has bit-field instructions or you define
   `STRUCTURE_SIZE_BOUNDARY' that way, you must define
   `PCC_BITFIELD_TYPE_MATTERS' to have a nonzero value.

   If your aim is to make GNU CC use the same conventions for laying out
   bitfields as are used by another compiler, here is how to investigate what
   the other compiler does.  Compile and run this program:

        struct foo1
        {
          char x;
          char :0;
          char y;
        };

        struct foo2
        {
          char x;
          int :0;
          char y;
        };

        main ()
        {
          printf ("Size of foo1 is %d\n",
                  sizeof (struct foo1));
          printf ("Size of foo2 is %d\n",
                  sizeof (struct foo2));
          exit (0);
        }

   If this prints 2 and 5, then the compiler's behavior is what you would get
   from `PCC_BITFIELD_TYPE_MATTERS'.

   Defined in svr4.h.  */
#define PCC_BITFIELD_TYPE_MATTERS 1


/* Layout of Source Language Data Types.  */

#define CHAR_TYPE_SIZE         8
#define SHORT_TYPE_SIZE       16
#define INT_TYPE_SIZE         32
#define LONG_TYPE_SIZE        32
#define LONG_LONG_TYPE_SIZE   64
#define FLOAT_TYPE_SIZE       32
#define DOUBLE_TYPE_SIZE      64
#define LONG_DOUBLE_TYPE_SIZE 64

/* An expression whose value is 1 or 0, according to whether the type `char'
   should be signed or unsigned by default.  The user can always override this
   default with the options `-fsigned-char' and `-funsigned-char'.  */
#define DEFAULT_SIGNED_CHAR 1


/* General purpose registers.  */
#define GPR_FIRST       0                       /* First gpr */
#define GPR_LAST        (GPR_FIRST + 63)        /* Last gpr */
#define GPR_R0          GPR_FIRST               /* R0, constant 0 */
#define GPR_FP          (GPR_FIRST + 2)         /* Frame pointer */
#define GPR_SP          (GPR_FIRST + 1)         /* Stack pointer */
						/* small data register */
#define SDA_BASE_REG    ((unsigned)(flag_pic ? PIC_REGNO : (GPR_FIRST+16)))
#define PIC_REGNO       (GPR_FIRST + 17)        /* PIC register */

#define FPR_FIRST       64			/* First FP reg */
#define FPR_LAST        127			/* Last  FP reg */

#define DEFAULT_CONDEXEC_TEMPS 4		/* reserve 4 regs by default */
#define GPR_TEMP_NUM	frv_condexec_temps	/* # gprs to reserve for temps */

/* We reserve the last CR and CCR in each category to be used as a reload
   register to reload the CR/CCR registers.  This is a kludge.  */
#define CC_FIRST	128			/* First ICC/FCC reg */
#define CC_LAST		135			/* Last  ICC/FCC reg */
#define ICC_FIRST	(CC_FIRST + 4)		/* First ICC reg */
#define ICC_LAST	(CC_FIRST + 7)		/* Last  ICC reg */
#define ICC_TEMP	(CC_FIRST + 7)		/* Temporary ICC reg */
#define FCC_FIRST	(CC_FIRST)		/* First FCC reg */
#define FCC_LAST	(CC_FIRST + 3)		/* Last  FCC reg */

/* Amount to shift a value to locate a ICC or FCC register in the CCR
   register and shift it to the bottom 4 bits.  */
#define CC_SHIFT_RIGHT(REGNO) (((REGNO) - CC_FIRST) << 2)

/* Mask to isolate a single ICC/FCC value.  */
#define CC_MASK		0xf

/* Masks to isolate the various bits in an ICC field.  */
#define ICC_MASK_N	0x8	/* negative */
#define ICC_MASK_Z	0x4	/* zero */
#define ICC_MASK_V	0x2	/* overflow */
#define ICC_MASK_C	0x1	/* carry */

/* Mask to isolate the N/Z flags in an ICC.  */
#define ICC_MASK_NZ (ICC_MASK_N | ICC_MASK_Z)

/* Mask to isolate the Z/C flags in an ICC.  */
#define ICC_MASK_ZC (ICC_MASK_Z | ICC_MASK_C)

/* Masks to isolate the various bits in a FCC field.  */
#define FCC_MASK_E	0x8	/* equal */
#define FCC_MASK_L	0x4	/* less than */
#define FCC_MASK_G	0x2	/* greater than */
#define FCC_MASK_U	0x1	/* unordered */

/* For CCR registers, the machine wants CR4..CR7 to be used for integer
   code and CR0..CR3 to be used for floating point.  */
#define CR_FIRST	136			/* First CCR */
#define CR_LAST		143			/* Last  CCR */
#define CR_NUM		(CR_LAST-CR_FIRST+1)	/* # of CCRs (8) */
#define ICR_FIRST	(CR_FIRST + 4)		/* First integer CCR */
#define ICR_LAST	(CR_FIRST + 7)		/* Last  integer CCR */
#define ICR_TEMP	ICR_LAST		/* Temp  integer CCR */
#define FCR_FIRST	(CR_FIRST + 0)		/* First float CCR */
#define FCR_LAST	(CR_FIRST + 3)		/* Last  float CCR */

/* Amount to shift a value to locate a CR register in the CCCR special purpose
   register and shift it to the bottom 2 bits.  */
#define CR_SHIFT_RIGHT(REGNO) (((REGNO) - CR_FIRST) << 1)

/* Mask to isolate a single CR value.  */
#define CR_MASK		0x3

#define ACC_FIRST	144			/* First acc register */
#define ACC_LAST	151			/* Last  acc register */

#define ACCG_FIRST	152			/* First accg register */
#define ACCG_LAST	159			/* Last  accg register */

#define AP_FIRST	160			/* fake argument pointer */

#define SPR_FIRST	161
#define SPR_LAST	162
#define LR_REGNO	(SPR_FIRST)
#define LCR_REGNO	(SPR_FIRST + 1)

#define GPR_P(R)	IN_RANGE_P (R, GPR_FIRST, GPR_LAST)
#define GPR_OR_AP_P(R)	(GPR_P (R) || (R) == ARG_POINTER_REGNUM)
#define FPR_P(R)	IN_RANGE_P (R, FPR_FIRST, FPR_LAST)
#define CC_P(R)		IN_RANGE_P (R, CC_FIRST, CC_LAST)
#define ICC_P(R)	IN_RANGE_P (R, ICC_FIRST, ICC_LAST)
#define FCC_P(R)	IN_RANGE_P (R, FCC_FIRST, FCC_LAST)
#define CR_P(R)		IN_RANGE_P (R, CR_FIRST, CR_LAST)
#define ICR_P(R)	IN_RANGE_P (R, ICR_FIRST, ICR_LAST)
#define FCR_P(R)	IN_RANGE_P (R, FCR_FIRST, FCR_LAST)
#define ACC_P(R)	IN_RANGE_P (R, ACC_FIRST, ACC_LAST)
#define ACCG_P(R)	IN_RANGE_P (R, ACCG_FIRST, ACCG_LAST)
#define SPR_P(R)	IN_RANGE_P (R, SPR_FIRST, SPR_LAST)

#define GPR_OR_PSEUDO_P(R)	(GPR_P (R) || (R) >= FIRST_PSEUDO_REGISTER)
#define FPR_OR_PSEUDO_P(R)	(FPR_P (R) || (R) >= FIRST_PSEUDO_REGISTER)
#define GPR_AP_OR_PSEUDO_P(R)	(GPR_OR_AP_P (R) || (R) >= FIRST_PSEUDO_REGISTER)
#define CC_OR_PSEUDO_P(R)	(CC_P (R) || (R) >= FIRST_PSEUDO_REGISTER)
#define ICC_OR_PSEUDO_P(R)	(ICC_P (R) || (R) >= FIRST_PSEUDO_REGISTER)
#define FCC_OR_PSEUDO_P(R)	(FCC_P (R) || (R) >= FIRST_PSEUDO_REGISTER)
#define CR_OR_PSEUDO_P(R)	(CR_P (R) || (R) >= FIRST_PSEUDO_REGISTER)
#define ICR_OR_PSEUDO_P(R)	(ICR_P (R) || (R) >= FIRST_PSEUDO_REGISTER)
#define FCR_OR_PSEUDO_P(R)	(FCR_P (R) || (R) >= FIRST_PSEUDO_REGISTER)
#define ACC_OR_PSEUDO_P(R)	(ACC_P (R) || (R) >= FIRST_PSEUDO_REGISTER)
#define ACCG_OR_PSEUDO_P(R)	(ACCG_P (R) || (R) >= FIRST_PSEUDO_REGISTER)

#define MAX_STACK_IMMEDIATE_OFFSET 2047


/* Register Basics.  */

/* Number of hardware registers known to the compiler.  They receive numbers 0
   through `FIRST_PSEUDO_REGISTER-1'; thus, the first pseudo register's number
   really is assigned the number `FIRST_PSEUDO_REGISTER'.  */
#define FIRST_PSEUDO_REGISTER (SPR_LAST + 1)

/* The first/last register that can contain the arguments to a function.  */
#define FIRST_ARG_REGNUM	(GPR_FIRST + 8)
#define LAST_ARG_REGNUM		(FIRST_ARG_REGNUM + FRV_NUM_ARG_REGS - 1)

/* Registers used by the exception handling functions.  These should be
   registers that are not otherwised used by the calling sequence.  */
#define FIRST_EH_REGNUM		14
#define LAST_EH_REGNUM		15