2003-12-26 Guilhem Lavaux <guilhem@kaffe.org>

[official-gcc.git] / gcc / config / pa / pa32-regs.h

/* Standard register usage.  */

/* Number of actual hardware registers.
   The hardware registers are assigned numbers for the compiler
   from 0 to just below FIRST_PSEUDO_REGISTER.
   All registers that the compiler knows about must be given numbers,
   even those that are not normally considered general registers.

   HP-PA 1.0 has 32 fullword registers and 16 floating point
   registers. The floating point registers hold either word or double
   word values.

   16 additional registers are reserved.

   HP-PA 1.1 has 32 fullword registers and 32 floating point
   registers. However, the floating point registers behave
   differently: the left and right halves of registers are addressable
   as 32 bit registers. So, we will set things up like the 68k which
   has different fp units: define separate register sets for the 1.0
   and 1.1 fp units.  */

#define FIRST_PSEUDO_REGISTER 89  /* 32 general regs + 56 fp regs +
                                     + 1 shift reg */

/* 1 for registers that have pervasive standard uses
   and are not available for the register allocator.

   On the HP-PA, these are:
   Reg 0        = 0 (hardware). However, 0 is used for condition code,
                  so is not fixed.
   Reg 1        = ADDIL target/Temporary (hardware).
   Reg 2        = Return Pointer
   Reg 3        = Frame Pointer
   Reg 4        = Frame Pointer (>8k varying frame with HP compilers only)
   Reg 4-18     = Preserved Registers
   Reg 19       = Linkage Table Register in HPUX 8.0 shared library scheme.
   Reg 20-22    = Temporary Registers
   Reg 23-26    = Temporary/Parameter Registers
   Reg 27       = Global Data Pointer (hp)
   Reg 28       = Temporary/Return Value register
   Reg 29       = Temporary/Static Chain/Return Value register #2
   Reg 30       = stack pointer
   Reg 31       = Temporary/Millicode Return Pointer (hp)

   Freg 0-3     = Status Registers       -- Not known to the compiler.
   Freg 4-7     = Arguments/Return Value
   Freg 8-11    = Temporary Registers
   Freg 12-15   = Preserved Registers

   Freg 16-31   = Reserved

   On the Snake, fp regs are

   Freg 0-3     = Status Registers      -- Not known to the compiler.
   Freg 4L-7R   = Arguments/Return Value
   Freg 8L-11R  = Temporary Registers
   Freg 12L-21R = Preserved Registers
   Freg 22L-31R = Temporary Registers

*/

#define FIXED_REGISTERS  \
 {0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 1, 0, 0, 1, 0, \
  /* fp registers */      \
  0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 0, 0, 0, 0, 0, 0, \
  0}

/* 1 for registers not available across function calls.
   These must include the FIXED_REGISTERS and also any
   registers that can be used without being saved.
   The latter must include the registers where values are returned
   and the register where structure-value addresses are passed.
   Aside from that, you can include as many other registers as you like.  */
#define CALL_USED_REGISTERS  \
 {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, 1, 1, 1, 1, 1, 1, 1, \
  /* fp registers */      \
  1, 1, 1, 1, 1, 1, 1, 1, \
  1, 1, 1, 1, 1, 1, 1, 1, \
  0, 0, 0, 0, 0, 0, 0, 0, \
  0, 0, 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, \
  1}

#define CONDITIONAL_REGISTER_USAGE \
{                                               \
  int i;                                        \
  if (!TARGET_PA_11)                            \
    {                                           \
      for (i = 56; i < 88; i++)                 \
        fixed_regs[i] = call_used_regs[i] = 1;  \
      for (i = 33; i < 88; i += 2)              \
        fixed_regs[i] = call_used_regs[i] = 1;  \
    }                                           \
  if (TARGET_DISABLE_FPREGS || TARGET_SOFT_FLOAT)\
    {                                           \
      for (i = 32; i < 88; i++)                 \
        fixed_regs[i] = call_used_regs[i] = 1;  \
    }                                           \
  if (flag_pic)                                 \
    fixed_regs[PIC_OFFSET_TABLE_REGNUM] = 1;    \
}

/* Allocate the call used registers first.  This should minimize
   the number of registers that need to be saved (as call used
   registers will generally not be allocated across a call).

   Experimentation has shown slightly better results by allocating
   FP registers first.  

   FP registers are ordered so that all L registers are selected before
   R registers.  This works around a false dependency interlock on the
   PA8000 when accessing the high and low parts of an FP register
   independently.  */

#define REG_ALLOC_ORDER \
 {                                      \
  /* caller-saved fp regs.  */          \
  68, 70, 72, 74, 76, 78, 80, 82,       \
  84, 86, 40, 42, 44, 46, 32, 34,       \
  36, 38,                               \
  69, 71, 73, 75, 77, 79, 81, 83,       \
  85, 87, 41, 43, 45, 47, 33, 35,       \
  37, 39,                               \
  /* caller-saved general regs.  */     \
  19, 20, 21, 22, 23, 24, 25, 26,       \
  27, 28, 29, 31,  2,                   \
  /* callee-saved fp regs.  */          \
  48, 50, 52, 54, 56, 58, 60, 62,       \
  64, 66,                               \
  49, 51, 53, 55, 57, 59, 61, 63,       \
  65, 67,                               \
  /* callee-saved general regs.  */     \
   3,  4,  5,  6,  7,  8,  9, 10,       \
  11, 12, 13, 14, 15, 16, 17, 18,       \
  /* special registers.  */             \
   1, 30,  0, 88}


/* Return number of consecutive hard regs needed starting at reg REGNO
   to hold something of mode MODE.
   This is ordinarily the length in words of a value of mode MODE
   but can be less for certain modes in special long registers.

   On the HP-PA, ordinary registers hold 32 bits worth;
   The floating point registers are 64 bits wide. Snake fp regs are 32
   bits wide */
#define HARD_REGNO_NREGS(REGNO, MODE)                                   \
  (FP_REGNO_P (REGNO)                                                   \
   ? (!TARGET_PA_11 ? 1 : (GET_MODE_SIZE (MODE) + 4 - 1) / 4)           \
   : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))

/* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
   On the HP-PA, the cpu registers can hold any mode.  For DImode, we
   choose a set of general register that includes the incoming arguments
   and the return value.  We specify a set with no overlaps so that we don't
   have to specify that the destination register in patterns using this mode
   is an early clobber.  */
#define HARD_REGNO_MODE_OK(REGNO, MODE) \
  ((REGNO) == 0 ? (MODE) == CCmode || (MODE) == CCFPmode                \
   /* On 1.0 machines, don't allow wide non-fp modes in fp regs.  */    \
   : !TARGET_PA_11 && FP_REGNO_P (REGNO)                                \
     ? GET_MODE_SIZE (MODE) <= 4 || GET_MODE_CLASS (MODE) == MODE_FLOAT \
   : FP_REGNO_P (REGNO)                                                 \
     ? GET_MODE_SIZE (MODE) <= 4 || ((REGNO) & 1) == 0                  \
   : (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD                            \
      || (GET_MODE_SIZE (MODE) == 2 * UNITS_PER_WORD                    \
          && ((((REGNO) & 1) == 1 && (REGNO) <= 25) || (REGNO) == 28))  \
      || (GET_MODE_SIZE (MODE) == 4 * UNITS_PER_WORD                    \
          && (((REGNO) & 3) == 3 && (REGNO) <= 23))))

/* How to renumber registers for dbx and gdb.

   Registers 0  - 31 remain unchanged.

   Registers 32 - 87 are mapped to 72 - 127

   Register 88 is mapped to 32.  */

#define DBX_REGISTER_NUMBER(REGNO) \
  ((REGNO) <= 31 ? (REGNO) :                                            \
   ((REGNO) <= 87 ? (REGNO) + 40 : 32))

/* We must not use the DBX register numbers for the DWARF 2 CFA column
   numbers because that maps to numbers beyond FIRST_PSEUDO_REGISTER.
   Instead use the identity mapping.  */
#define DWARF_FRAME_REGNUM(REG) REG

/* Define the classes of registers for register constraints in the
   machine description.  Also define ranges of constants.

   One of the classes must always be named ALL_REGS and include all hard regs.
   If there is more than one class, another class must be named NO_REGS
   and contain no registers.

   The name GENERAL_REGS must be the name of a class (or an alias for
   another name such as ALL_REGS).  This is the class of registers
   that is allowed by "g" or "r" in a register constraint.
   Also, registers outside this class are allocated only when
   instructions express preferences for them.

   The classes must be numbered in nondecreasing order; that is,
   a larger-numbered class must never be contained completely
   in a smaller-numbered class.

   For any two classes, it is very desirable that there be another
   class that represents their union.  */

  /* The HP-PA has four kinds of registers: general regs, 1.0 fp regs,
     1.1 fp regs, and the high 1.1 fp regs, to which the operands of
     fmpyadd and fmpysub are restricted.  */

enum reg_class { NO_REGS, R1_REGS, GENERAL_REGS, FPUPPER_REGS, FP_REGS,
                 GENERAL_OR_FP_REGS, SHIFT_REGS, ALL_REGS, LIM_REG_CLASSES};

#define N_REG_CLASSES (int) LIM_REG_CLASSES

/* Give names of register classes as strings for dump file.   */

#define REG_CLASS_NAMES \
  {"NO_REGS", "R1_REGS", "GENERAL_REGS", "FPUPPER_REGS", "FP_REGS", \
   "GENERAL_OR_FP_REGS", "SHIFT_REGS", "ALL_REGS"}

/* Define which registers fit in which classes.
   This is an initializer for a vector of HARD_REG_SET
   of length N_REG_CLASSES. Register 0, the "condition code" register,
   is in no class.  */

#define REG_CLASS_CONTENTS      \
 {{0x00000000, 0x00000000, 0x00000000}, /* NO_REGS */                   \
  {0x00000002, 0x00000000, 0x00000000}, /* R1_REGS */                   \
  {0xfffffffe, 0x00000000, 0x00000000}, /* GENERAL_REGS */              \
  {0x00000000, 0xff000000, 0x00ffffff}, /* FPUPPER_REGS */              \
  {0x00000000, 0xffffffff, 0x00ffffff}, /* FP_REGS */                   \
  {0xfffffffe, 0xffffffff, 0x00ffffff}, /* GENERAL_OR_FP_REGS */        \
  {0x00000000, 0x00000000, 0x01000000}, /* SHIFT_REGS */                \
  {0xfffffffe, 0xffffffff, 0x01ffffff}} /* ALL_REGS */

/* Return the class number of the smallest class containing
   reg number REGNO.  This could be a conditional expression
   or could index an array.  */

#define REGNO_REG_CLASS(REGNO)                                          \
  ((REGNO) == 0 ? NO_REGS                                               \
   : (REGNO) == 1 ? R1_REGS                                             \
   : (REGNO) < 32 ? GENERAL_REGS                                        \
   : (REGNO) < 56 ? FP_REGS                                             \
   : (REGNO) < 88 ? FPUPPER_REGS                                        \
   : SHIFT_REGS)

/* Get reg_class from a letter such as appears in the machine description.  */
/* Keep 'x' for backward compatibility with user asm.   */
#define REG_CLASS_FROM_LETTER(C) \
  ((C) == 'f' ? FP_REGS :                                       \
   (C) == 'y' ? FPUPPER_REGS :                                  \
   (C) == 'x' ? FP_REGS :                                       \
   (C) == 'q' ? SHIFT_REGS :                                    \
   (C) == 'a' ? R1_REGS :                                       \
   (C) == 'Z' ? ALL_REGS : NO_REGS)

/* Return the maximum number of consecutive registers
   needed to represent mode MODE in a register of class CLASS.  */
#define CLASS_MAX_NREGS(CLASS, MODE)                                    \
  ((CLASS) == FP_REGS || (CLASS) == FPUPPER_REGS                        \
   ? (!TARGET_PA_11 ? 1 : (GET_MODE_SIZE (MODE) + 4 - 1) / 4)           \
   : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))

/* 1 if N is a possible register number for function argument passing.  */

#define FUNCTION_ARG_REGNO_P(N) \
  (((N) >= 23 && (N) <= 26) || (! TARGET_SOFT_FLOAT && (N) >= 32 && (N) <= 39)) 

/* How to refer to registers in assembler output.
   This sequence is indexed by compiler's hard-register-number (see above).  */

#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",   \
 "%fr4",  "%fr4R",  "%fr5",  "%fr5R",  "%fr6",  "%fr6R",  "%fr7",  "%fr7R",  \
 "%fr8",  "%fr8R",  "%fr9",  "%fr9R",  "%fr10", "%fr10R", "%fr11", "%fr11R", \
 "%fr12", "%fr12R", "%fr13", "%fr13R", "%fr14", "%fr14R", "%fr15", "%fr15R", \
 "%fr16", "%fr16R", "%fr17", "%fr17R", "%fr18", "%fr18R", "%fr19", "%fr19R", \
 "%fr20", "%fr20R", "%fr21", "%fr21R", "%fr22", "%fr22R", "%fr23", "%fr23R", \
 "%fr24", "%fr24R", "%fr25", "%fr25R", "%fr26", "%fr26R", "%fr27", "%fr27R", \
 "%fr28", "%fr28R", "%fr29", "%fr29R", "%fr30", "%fr30R", "%fr31", "%fr31R", \
 "SAR"}

#define ADDITIONAL_REGISTER_NAMES \
{{"%fr4L",32}, {"%fr5L",34}, {"%fr6L",36}, {"%fr7L",38},                \
 {"%fr8L",40}, {"%fr9L",42}, {"%fr10L",44}, {"%fr11L",46},              \
 {"%fr12L",48}, {"%fr13L",50}, {"%fr14L",52}, {"%fr15L",54},            \
 {"%fr16L",56}, {"%fr17L",58}, {"%fr18L",60}, {"%fr19L",62},            \
 {"%fr20L",64}, {"%fr21L",66}, {"%fr22L",68}, {"%fr23L",70},            \
 {"%fr24L",72}, {"%fr25L",74}, {"%fr26L",76}, {"%fr27L",78},            \
 {"%fr28L",80}, {"%fr29L",82}, {"%fr30L",84}, {"%fr31R",86},            \
 {"%cr11",88}}

#define FP_SAVED_REG_LAST 66
#define FP_SAVED_REG_FIRST 48
#define FP_REG_STEP 2
#define FP_REG_FIRST 32
#define FP_REG_LAST 87