gcc/config/pa/pa32-regs.h

   1 /* Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
   2    2008, 2010 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25 /* Standard register usage.  */
  26
  27 /* Number of actual hardware registers.
  28    The hardware registers are assigned numbers for the compiler
  29    from 0 to just below FIRST_PSEUDO_REGISTER.
  30    All registers that the compiler knows about must be given numbers,
  31    even those that are not normally considered general registers.
  32
  33    HP-PA 1.0 has 32 fullword registers and 16 floating point
  34    registers. The floating point registers hold either word or double
  35    word values.
  36
  37    16 additional registers are reserved.
  38
  39    HP-PA 1.1 has 32 fullword registers and 32 floating point
  40    registers. However, the floating point registers behave
  41    differently: the left and right halves of registers are addressable
  42    as 32-bit registers. So, we will set things up like the 68k which
  43    has different fp units: define separate register sets for the 1.0
  44    and 1.1 fp units.  */
  45
  46 #define FIRST_PSEUDO_REGISTER 90  /* 32 general regs + 56 fp regs +
  47                                      + 1 shift reg + frame pointer */
  48
  49 /* 1 for registers that have pervasive standard uses
  50    and are not available for the register allocator.
  51
  52    On the HP-PA, these are:
  53    Reg 0        = 0 (hardware). However, 0 is used for condition code,
  54                   so is not fixed.
  55    Reg 1        = ADDIL target/Temporary (hardware).
  56    Reg 2        = Return Pointer
  57    Reg 3        = Frame Pointer
  58    Reg 4        = Frame Pointer (>8k varying frame with HP compilers only)
  59    Reg 4-18     = Preserved Registers
  60    Reg 19       = Linkage Table Register in HPUX 8.0 shared library scheme.
  61    Reg 20-22    = Temporary Registers
  62    Reg 23-26    = Temporary/Parameter Registers
  63    Reg 27       = Global Data Pointer (hp)
  64    Reg 28       = Temporary/Return Value register
  65    Reg 29       = Temporary/Static Chain/Return Value register #2
  66    Reg 30       = stack pointer
  67    Reg 31       = Temporary/Millicode Return Pointer (hp)
  68
  69    Freg 0-3     = Status Registers       -- Not known to the compiler.
  70    Freg 4-7     = Arguments/Return Value
  71    Freg 8-11    = Temporary Registers
  72    Freg 12-15   = Preserved Registers
  73
  74    Freg 16-31   = Reserved
  75
  76    On the Snake, fp regs are
  77
  78    Freg 0-3     = Status Registers      -- Not known to the compiler.
  79    Freg 4L-7R   = Arguments/Return Value
  80    Freg 8L-11R  = Temporary Registers
  81    Freg 12L-21R = Preserved Registers
  82    Freg 22L-31R = Temporary Registers
  83
  84 */
  85
  86 #define FIXED_REGISTERS  \
  87  {0, 0, 0, 0, 0, 0, 0, 0, \
  88   0, 0, 0, 0, 0, 0, 0, 0, \
  89   0, 0, 0, 0, 0, 0, 0, 0, \
  90   0, 0, 0, 1, 0, 0, 1, 0, \
  91   /* fp registers */      \
  92   0, 0, 0, 0, 0, 0, 0, 0, \
  93   0, 0, 0, 0, 0, 0, 0, 0, \
  94   0, 0, 0, 0, 0, 0, 0, 0, \
  95   0, 0, 0, 0, 0, 0, 0, 0, \
  96   0, 0, 0, 0, 0, 0, 0, 0, \
  97   0, 0, 0, 0, 0, 0, 0, 0, \
  98   0, 0, 0, 0, 0, 0, 0, 0, \
  99   /* shift register and soft frame pointer */ \
 100   0, 1}
 101
 102 /* 1 for registers not available across function calls.
 103    These must include the FIXED_REGISTERS and also any
 104    registers that can be used without being saved.
 105    The latter must include the registers where values are returned
 106    and the register where structure-value addresses are passed.
 107    Aside from that, you can include as many other registers as you like.  */
 108 #define CALL_USED_REGISTERS  \
 109  {1, 1, 1, 0, 0, 0, 0, 0, \
 110   0, 0, 0, 0, 0, 0, 0, 0, \
 111   0, 0, 0, 1, 1, 1, 1, 1, \
 112   1, 1, 1, 1, 1, 1, 1, 1, \
 113   /* fp registers */      \
 114   1, 1, 1, 1, 1, 1, 1, 1, \
 115   1, 1, 1, 1, 1, 1, 1, 1, \
 116   0, 0, 0, 0, 0, 0, 0, 0, \
 117   0, 0, 0, 0, 0, 0, 0, 0, \
 118   0, 0, 0, 0, 1, 1, 1, 1, \
 119   1, 1, 1, 1, 1, 1, 1, 1, \
 120   1, 1, 1, 1, 1, 1, 1, 1, \
 121   /* shift register and soft frame pointer */ \
 122   1, 1}
 123
 124 /* Allocate the call used registers first.  This should minimize
 125    the number of registers that need to be saved (as call used
 126    registers will generally not be allocated across a call).
 127
 128    Experimentation has shown slightly better results by allocating
 129    FP registers first.  We allocate the caller-saved registers more
 130    or less in reverse order to their allocation as arguments.
 131
 132    FP registers are ordered so that all L registers are selected before
 133    R registers.  This works around a false dependency interlock on the
 134    PA8000 when accessing the high and low parts of an FP register
 135    independently.  */
 136
 137 #define REG_ALLOC_ORDER \
 138  {                                      \
 139   /* caller-saved fp regs.  */          \
 140   68, 70, 72, 74, 76, 78, 80, 82,       \
 141   84, 86, 40, 42, 44, 46, 38, 36,       \
 142   34, 32,                               \
 143   69, 71, 73, 75, 77, 79, 81, 83,       \
 144   85, 87, 41, 43, 45, 47, 39, 37,       \
 145   35, 33,                               \
 146   /* caller-saved general regs.  */     \
 147   28, 19, 20, 21, 22, 31, 27, 29,       \
 148   23, 24, 25, 26,  2,                   \
 149   /* callee-saved fp regs.  */          \
 150   48, 50, 52, 54, 56, 58, 60, 62,       \
 151   64, 66,                               \
 152   49, 51, 53, 55, 57, 59, 61, 63,       \
 153   65, 67,                               \
 154   /* callee-saved general regs.  */     \
 155    3,  4,  5,  6,  7,  8,  9, 10,       \
 156   11, 12, 13, 14, 15, 16, 17, 18,       \
 157   /* special registers.  */             \
 158    1, 30,  0, 88, 89}
 159
 160
 161 /* Return number of consecutive hard regs needed starting at reg REGNO
 162    to hold something of mode MODE.
 163    This is ordinarily the length in words of a value of mode MODE
 164    but can be less for certain modes in special long registers.
 165
 166    On the HP-PA, general registers are 32 bits wide.  The floating
 167    point registers are 64 bits wide.  Snake fp regs are treated as
 168    32 bits wide since the left and right parts are independently
 169    accessible.  */
 170 #define HARD_REGNO_NREGS(REGNO, MODE)                                   \
 171   (FP_REGNO_P (REGNO)                                                   \
 172    ? (!TARGET_PA_11                                                     \
 173       ? COMPLEX_MODE_P (MODE) ? 2 : 1                                   \
 174       : (GET_MODE_SIZE (MODE) + 4 - 1) / 4)                             \
 175    : (GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 176
 177 /* There are no instructions that use DImode in PA 1.0, so we only
 178    allow it in PA 1.1 and later.  */
 179 #define VALID_FP_MODE_P(MODE)                                           \
 180   ((MODE) == SFmode || (MODE) == DFmode                                 \
 181    || (MODE) == SCmode || (MODE) == DCmode                              \
 182    || (MODE) == SImode || (TARGET_PA_11 && (MODE) == DImode))
 183
 184 /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
 185
 186    On the HP-PA, the cpu registers can hold any mode that fits in 32 bits.
 187    For the 64-bit modes, we choose a set of non-overlapping general registers
 188    that includes the incoming arguments and the return value.  We specify a
 189    set with no overlaps so that we don't have to specify that the destination
 190    register is an early clobber in patterns using this mode.  Except for the
 191    return value, the starting registers are odd.  For 128 and 256 bit modes,
 192    we similarly specify non-overlapping sets of cpu registers.  However,
 193    there aren't any patterns defined for modes larger than 64 bits at the
 194    moment.
 195
 196    We limit the modes allowed in the floating point registers to the
 197    set of modes used in the machine definition.  In addition, we allow
 198    the complex modes SCmode and DCmode.  The real and imaginary parts
 199    of complex modes are allocated to separate registers.  This might
 200    allow patterns to be defined in the future to operate on these values.
 201
 202    The PA 2.0 architecture specifies that quad-precision floating-point
 203    values should start on an even floating point register.  Thus, we
 204    choose non-overlapping sets of registers starting on even register
 205    boundaries for large modes.  However, there is currently no support
 206    in the machine definition for modes larger than 64 bits.  TFmode is
 207    supported under HP-UX using libcalls.  Since TFmode values are passed
 208    by reference, they never need to be loaded into the floating-point
 209    registers.  */
 210 #define HARD_REGNO_MODE_OK(REGNO, MODE) \
 211   ((REGNO) == 0 ? (MODE) == CCmode || (MODE) == CCFPmode                \
 212    : (REGNO) == 88 ? SCALAR_INT_MODE_P (MODE)                           \
 213    : !TARGET_PA_11 && FP_REGNO_P (REGNO)                                \
 214      ? (VALID_FP_MODE_P (MODE)                                          \
 215         && (GET_MODE_SIZE (MODE) <= 8                                   \
 216             || (GET_MODE_SIZE (MODE) == 16 && ((REGNO) & 3) == 0)))     \
 217    : FP_REGNO_P (REGNO)                                                 \
 218      ? (VALID_FP_MODE_P (MODE)                                          \
 219         && (GET_MODE_SIZE (MODE) <= 4                                   \
 220             || (GET_MODE_SIZE (MODE) == 8 && ((REGNO) & 1) == 0)        \
 221             || (GET_MODE_SIZE (MODE) == 16 && ((REGNO) & 3) == 0)       \
 222             || (GET_MODE_SIZE (MODE) == 32 && ((REGNO) & 7) == 0)))     \
 223    : (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD                            \
 224       || (GET_MODE_SIZE (MODE) == 2 * UNITS_PER_WORD                    \
 225           && ((((REGNO) & 1) == 1 && (REGNO) <= 25) || (REGNO) == 28))  \
 226       || (GET_MODE_SIZE (MODE) == 4 * UNITS_PER_WORD                    \
 227           && ((REGNO) & 3) == 3 && (REGNO) <= 23)                       \
 228       || (GET_MODE_SIZE (MODE) == 8 * UNITS_PER_WORD                    \
 229           && ((REGNO) & 7) == 3 && (REGNO) <= 19)))
 230
 231 /* How to renumber registers for dbx and gdb.
 232
 233    Registers 0  - 31 remain unchanged.
 234
 235    Registers 32 - 87 are mapped to 72 - 127
 236
 237    Register 88 is mapped to 32.  */
 238
 239 #define DBX_REGISTER_NUMBER(REGNO) \
 240   ((REGNO) <= 31 ? (REGNO) :                                            \
 241    ((REGNO) <= 87 ? (REGNO) + 40 : 32))
 242
 243 /* We must not use the DBX register numbers for the DWARF 2 CFA column
 244    numbers because that maps to numbers beyond FIRST_PSEUDO_REGISTER.
 245    Instead use the identity mapping.  */
 246 #define DWARF_FRAME_REGNUM(REG) REG
 247
 248 /* Define the classes of registers for register constraints in the
 249    machine description.  Also define ranges of constants.
 250
 251    One of the classes must always be named ALL_REGS and include all hard regs.
 252    If there is more than one class, another class must be named NO_REGS
 253    and contain no registers.
 254
 255    The name GENERAL_REGS must be the name of a class (or an alias for
 256    another name such as ALL_REGS).  This is the class of registers
 257    that is allowed by "g" or "r" in a register constraint.
 258    Also, registers outside this class are allocated only when
 259    instructions express preferences for them.
 260
 261    The classes must be numbered in nondecreasing order; that is,
 262    a larger-numbered class must never be contained completely
 263    in a smaller-numbered class.
 264
 265    For any two classes, it is very desirable that there be another
 266    class that represents their union.  */
 267
 268   /* The HP-PA has four kinds of registers: general regs, 1.0 fp regs,
 269      1.1 fp regs, and the high 1.1 fp regs, to which the operands of
 270      fmpyadd and fmpysub are restricted.  */
 271
 272 enum reg_class { NO_REGS, R1_REGS, GENERAL_REGS, FPUPPER_REGS, FP_REGS,
 273                  GENERAL_OR_FP_REGS, SHIFT_REGS, ALL_REGS, LIM_REG_CLASSES};
 274
 275 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 276
 277 /* Give names of register classes as strings for dump file.  */
 278
 279 #define REG_CLASS_NAMES \
 280   {"NO_REGS", "R1_REGS", "GENERAL_REGS", "FPUPPER_REGS", "FP_REGS", \
 281    "GENERAL_OR_FP_REGS", "SHIFT_REGS", "ALL_REGS"}
 282
 283 /* Define which registers fit in which classes.
 284    This is an initializer for a vector of HARD_REG_SET
 285    of length N_REG_CLASSES. Register 0, the "condition code" register,
 286    is in no class.  */
 287
 288 #define REG_CLASS_CONTENTS      \
 289  {{0x00000000, 0x00000000, 0x00000000}, /* NO_REGS */                   \
 290   {0x00000002, 0x00000000, 0x00000000}, /* R1_REGS */                   \
 291   {0xfffffffe, 0x00000000, 0x02000000}, /* GENERAL_REGS */              \
 292   {0x00000000, 0xff000000, 0x00ffffff}, /* FPUPPER_REGS */              \
 293   {0x00000000, 0xffffffff, 0x00ffffff}, /* FP_REGS */                   \
 294   {0xfffffffe, 0xffffffff, 0x02ffffff}, /* GENERAL_OR_FP_REGS */        \
 295   {0x00000000, 0x00000000, 0x01000000}, /* SHIFT_REGS */                \
 296   {0xfffffffe, 0xffffffff, 0x03ffffff}} /* ALL_REGS */
 297
 298 /* Defines invalid mode changes.  */
 299
 300 #define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \
 301   pa_cannot_change_mode_class (FROM, TO, CLASS)
 302
 303 /* Return the class number of the smallest class containing
 304    reg number REGNO.  This could be a conditional expression
 305    or could index an array.  */
 306
 307 #define REGNO_REG_CLASS(REGNO)                                          \
 308   ((REGNO) == 0 ? NO_REGS                                               \
 309    : (REGNO) == 1 ? R1_REGS                                             \
 310    : (REGNO) < 32 || (REGNO) == 89 ? GENERAL_REGS                       \
 311    : (REGNO) < 56 ? FP_REGS                                             \
 312    : (REGNO) < 88 ? FPUPPER_REGS                                        \
 313    : SHIFT_REGS)
 314
 315 /* Return the maximum number of consecutive registers
 316    needed to represent mode MODE in a register of class CLASS.  */
 317 #define CLASS_MAX_NREGS(CLASS, MODE)                                    \
 318   ((CLASS) == FP_REGS || (CLASS) == FPUPPER_REGS                        \
 319    ? (!TARGET_PA_11                                                     \
 320       ? COMPLEX_MODE_P (MODE) ? 2 : 1                                   \
 321       : (GET_MODE_SIZE (MODE) + 4 - 1) / 4)                             \
 322    : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
 323
 324 /* 1 if N is a possible register number for function argument passing.  */
 325
 326 #define FUNCTION_ARG_REGNO_P(N) \
 327   (((N) >= 23 && (N) <= 26) || (! TARGET_SOFT_FLOAT && (N) >= 32 && (N) <= 39))
 328
 329 /* How to refer to registers in assembler output.
 330    This sequence is indexed by compiler's hard-register-number (see above).  */
 331
 332 #define REGISTER_NAMES \
 333 {"%r0",   "%r1",    "%r2",   "%r3",    "%r4",   "%r5",    "%r6",   "%r7",    \
 334  "%r8",   "%r9",    "%r10",  "%r11",   "%r12",  "%r13",   "%r14",  "%r15",   \
 335  "%r16",  "%r17",   "%r18",  "%r19",   "%r20",  "%r21",   "%r22",  "%r23",   \
 336  "%r24",  "%r25",   "%r26",  "%r27",   "%r28",  "%r29",   "%r30",  "%r31",   \
 337  "%fr4",  "%fr4R",  "%fr5",  "%fr5R",  "%fr6",  "%fr6R",  "%fr7",  "%fr7R",  \
 338  "%fr8",  "%fr8R",  "%fr9",  "%fr9R",  "%fr10", "%fr10R", "%fr11", "%fr11R", \
 339  "%fr12", "%fr12R", "%fr13", "%fr13R", "%fr14", "%fr14R", "%fr15", "%fr15R", \
 340  "%fr16", "%fr16R", "%fr17", "%fr17R", "%fr18", "%fr18R", "%fr19", "%fr19R", \
 341  "%fr20", "%fr20R", "%fr21", "%fr21R", "%fr22", "%fr22R", "%fr23", "%fr23R", \
 342  "%fr24", "%fr24R", "%fr25", "%fr25R", "%fr26", "%fr26R", "%fr27", "%fr27R", \
 343  "%fr28", "%fr28R", "%fr29", "%fr29R", "%fr30", "%fr30R", "%fr31", "%fr31R", \
 344  "SAR",   "sfp"}
 345
 346 #define ADDITIONAL_REGISTER_NAMES \
 347 {{"%fr4L",32}, {"%fr5L",34}, {"%fr6L",36}, {"%fr7L",38},                \
 348  {"%fr8L",40}, {"%fr9L",42}, {"%fr10L",44}, {"%fr11L",46},              \
 349  {"%fr12L",48}, {"%fr13L",50}, {"%fr14L",52}, {"%fr15L",54},            \
 350  {"%fr16L",56}, {"%fr17L",58}, {"%fr18L",60}, {"%fr19L",62},            \
 351  {"%fr20L",64}, {"%fr21L",66}, {"%fr22L",68}, {"%fr23L",70},            \
 352  {"%fr24L",72}, {"%fr25L",74}, {"%fr26L",76}, {"%fr27L",78},            \
 353  {"%fr28L",80}, {"%fr29L",82}, {"%fr30L",84}, {"%fr31R",86},            \
 354  {"%cr11",88}}
 355
 356 #define FP_SAVED_REG_LAST 66
 357 #define FP_SAVED_REG_FIRST 48
 358 #define FP_REG_STEP 2
 359 #define FP_REG_FIRST 32
 360 #define FP_REG_LAST 87