1 /* Configuration for GCC-compiler for PA-RISC. 2 Copyright (C) 1999-2016 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 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 GCC is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 /* Standard register usage. 21 22 It is safe to refer to actual register numbers in this file. */ 23 24 /* Number of actual hardware registers. 25 The hardware registers are assigned numbers for the compiler 26 from 0 to just below FIRST_PSEUDO_REGISTER. 27 All registers that the compiler knows about must be given numbers, 28 even those that are not normally considered general registers. 29 30 HP-PA 2.0w has 32 fullword registers and 32 floating point 31 registers. However, the floating point registers behave 32 differently: the left and right halves of registers are addressable 33 as 32-bit registers. 34 35 Due to limitations within GCC itself, we do not expose the left/right 36 half addressability when in wide mode. This is not a major performance 37 issue as using the halves independently triggers false dependency stalls 38 anyway. */ 39 40 #define FIRST_PSEUDO_REGISTER 62 /* 32 general regs + 28 fp regs + 41 + 1 shift reg + frame pointer */ 42 43 /* 1 for registers that have pervasive standard uses 44 and are not available for the register allocator. 45 46 On the HP-PA, these are: 47 Reg 0 = 0 (hardware). However, 0 is used for condition code, 48 so is not fixed. 49 Reg 1 = ADDIL target/Temporary (hardware). 50 Reg 2 = Return Pointer 51 Reg 3 = Frame Pointer 52 Reg 4 = Frame Pointer (>8k varying frame with HP compilers only) 53 Reg 4-18 = Preserved Registers 54 Reg 19 = Linkage Table Register in HPUX 8.0 shared library scheme. 55 Reg 20-22 = Temporary Registers 56 Reg 23-26 = Temporary/Parameter Registers 57 Reg 27 = Global Data Pointer (hp) 58 Reg 28 = Temporary/Return Value register 59 Reg 29 = Temporary/Static Chain/Return Value register #2 60 Reg 30 = stack pointer 61 Reg 31 = Temporary/Millicode Return Pointer (hp) 62 63 Freg 0-3 = Status Registers -- Not known to the compiler. 64 Freg 4-7 = Arguments/Return Value 65 Freg 8-11 = Temporary Registers 66 Freg 12-21 = Preserved Registers 67 Freg 22-31 = Temporary Registers 68 69 */ 70 71 #define FIXED_REGISTERS \ 72 {0, 0, 0, 0, 0, 0, 0, 0, \ 73 0, 0, 0, 0, 0, 0, 0, 0, \ 74 0, 0, 0, 0, 0, 0, 0, 0, \ 75 0, 0, 0, 1, 0, 0, 1, 0, \ 76 /* fp registers */ \ 77 0, 0, 0, 0, 0, 0, 0, 0, \ 78 0, 0, 0, 0, 0, 0, 0, 0, \ 79 0, 0, 0, 0, 0, 0, 0, 0, \ 80 0, 0, 0, 0, \ 81 /* shift register and soft frame pointer */ \ 82 0, 1} 83 84 /* 1 for registers not available across function calls. 85 These must include the FIXED_REGISTERS and also any 86 registers that can be used without being saved. 87 The latter must include the registers where values are returned 88 and the register where structure-value addresses are passed. 89 Aside from that, you can include as many other registers as you like. */ 90 #define CALL_USED_REGISTERS \ 91 {1, 1, 1, 0, 0, 0, 0, 0, \ 92 0, 0, 0, 0, 0, 0, 0, 0, \ 93 0, 0, 0, 1, 1, 1, 1, 1, \ 94 1, 1, 1, 1, 1, 1, 1, 1, \ 95 /* fp registers */ \ 96 1, 1, 1, 1, 1, 1, 1, 1, \ 97 0, 0, 0, 0, 0, 0, 0, 0, \ 98 0, 0, 1, 1, 1, 1, 1, 1, \ 99 1, 1, 1, 1, \ 100 /* shift register and soft frame pointer */ \ 101 1, 1} 102 103 /* Allocate the call used registers first. This should minimize 104 the number of registers that need to be saved (as call used 105 registers will generally not be allocated across a call). 106 107 Experimentation has shown slightly better results by allocating 108 FP registers first. We allocate the caller-saved registers more 109 or less in reverse order to their allocation as arguments. */ 110 111 #define REG_ALLOC_ORDER \ 112 { \ 113 /* caller-saved fp regs. */ \ 114 50, 51, 52, 53, 54, 55, 56, 57, \ 115 58, 59, 39, 38, 37, 36, 35, 34, \ 116 33, 32, \ 117 /* caller-saved general regs. */ \ 118 28, 31, 19, 20, 21, 22, 23, 24, \ 119 25, 26, 29, 2, \ 120 /* callee-saved fp regs. */ \ 121 40, 41, 42, 43, 44, 45, 46, 47, \ 122 48, 49, \ 123 /* callee-saved general regs. */ \ 124 3, 4, 5, 6, 7, 8, 9, 10, \ 125 11, 12, 13, 14, 15, 16, 17, 18, \ 126 /* special registers. */ \ 127 1, 27, 30, 0, 60, 61} 128 129 130 /* Return number of consecutive hard regs needed starting at reg REGNO 131 to hold something of mode MODE. 132 This is ordinarily the length in words of a value of mode MODE 133 but can be less for certain modes in special long registers. 134 135 For PA64, GPRs and FPRs hold 64 bits worth. We ignore the 32-bit 136 addressability of the FPRs and pretend each register holds precisely 137 WORD_SIZE bits. Note that SCmode values are placed in a single FPR. 138 Thus, any patterns defined to operate on these values would have to 139 use the 32-bit addressability of the FPR registers. */ 140 #define HARD_REGNO_NREGS(REGNO, MODE) \ 141 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) 142 143 /* These are the valid FP modes. */ 144 #define VALID_FP_MODE_P(MODE) \ 145 ((MODE) == SFmode || (MODE) == DFmode \ 146 || (MODE) == SCmode || (MODE) == DCmode \ 147 || (MODE) == SImode || (MODE) == DImode) 148 149 /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE. 150 On the HP-PA, the cpu registers can hold any mode. We 151 force this to be an even register if it cannot hold the full mode. */ 152 #define HARD_REGNO_MODE_OK(REGNO, MODE) \ 153 ((REGNO) == 0 \ 154 ? (MODE) == CCmode || (MODE) == CCFPmode \ 155 : (REGNO) == 60 ? SCALAR_INT_MODE_P (MODE) \ 156 /* Make wide modes be in aligned registers. */ \ 157 : FP_REGNO_P (REGNO) \ 158 ? (VALID_FP_MODE_P (MODE) \ 159 && (GET_MODE_SIZE (MODE) <= 8 \ 160 || (GET_MODE_SIZE (MODE) == 16 && ((REGNO) & 1) == 0) \ 161 || (GET_MODE_SIZE (MODE) == 32 && ((REGNO) & 3) == 0))) \ 162 : (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD \ 163 || (GET_MODE_SIZE (MODE) == 2 * UNITS_PER_WORD \ 164 && ((((REGNO) & 1) == 1 && (REGNO) <= 25) || (REGNO) == 28)) \ 165 || (GET_MODE_SIZE (MODE) == 4 * UNITS_PER_WORD \ 166 && ((REGNO) & 3) == 3 && (REGNO) <= 23))) 167 168 /* How to renumber registers for dbx and gdb. 169 170 Registers 0 - 31 remain unchanged. 171 172 Registers 32 - 59 are mapped to 72, 74, 76 ... 173 174 Register 60 is mapped to 32. */ 175 #define DBX_REGISTER_NUMBER(REGNO) \ 176 ((REGNO) <= 31 ? (REGNO) : ((REGNO) < 60 ? (REGNO - 32) * 2 + 72 : 32)) 177 178 /* We must not use the DBX register numbers for the DWARF 2 CFA column 179 numbers because that maps to numbers beyond FIRST_PSEUDO_REGISTER. 180 Instead use the identity mapping. */ 181 #define DWARF_FRAME_REGNUM(REG) REG 182 183 /* Define the classes of registers for register constraints in the 184 machine description. Also define ranges of constants. 185 186 One of the classes must always be named ALL_REGS and include all hard regs. 187 If there is more than one class, another class must be named NO_REGS 188 and contain no registers. 189 190 The name GENERAL_REGS must be the name of a class (or an alias for 191 another name such as ALL_REGS). This is the class of registers 192 that is allowed by "g" or "r" in a register constraint. 193 Also, registers outside this class are allocated only when 194 instructions express preferences for them. 195 196 The classes must be numbered in nondecreasing order; that is, 197 a larger-numbered class must never be contained completely 198 in a smaller-numbered class. 199 200 For any two classes, it is very desirable that there be another 201 class that represents their union. */ 202 203 /* The HP-PA has four kinds of registers: general regs, 1.0 fp regs, 204 1.1 fp regs, and the high 1.1 fp regs, to which the operands of 205 fmpyadd and fmpysub are restricted. */ 206 207 enum reg_class { NO_REGS, R1_REGS, GENERAL_REGS, FPUPPER_REGS, FP_REGS, 208 GENERAL_OR_FP_REGS, SHIFT_REGS, ALL_REGS, LIM_REG_CLASSES}; 209 210 #define N_REG_CLASSES (int) LIM_REG_CLASSES 211 212 /* Give names of register classes as strings for dump file. */ 213 214 #define REG_CLASS_NAMES \ 215 {"NO_REGS", "R1_REGS", "GENERAL_REGS", "FPUPPER_REGS", "FP_REGS", \ 216 "GENERAL_OR_FP_REGS", "SHIFT_REGS", "ALL_REGS"} 217 218 /* Define which registers fit in which classes. 219 This is an initializer for a vector of HARD_REG_SET 220 of length N_REG_CLASSES. Register 0, the "condition code" register, 221 is in no class. */ 222 223 #define REG_CLASS_CONTENTS \ 224 {{0x00000000, 0x00000000}, /* NO_REGS */ \ 225 {0x00000002, 0x00000000}, /* R1_REGS */ \ 226 {0xfffffffe, 0x20000000}, /* GENERAL_REGS */ \ 227 {0x00000000, 0x00000000}, /* FPUPPER_REGS */ \ 228 {0x00000000, 0x0fffffff}, /* FP_REGS */ \ 229 {0xfffffffe, 0x2fffffff}, /* GENERAL_OR_FP_REGS */ \ 230 {0x00000000, 0x10000000}, /* SHIFT_REGS */ \ 231 {0xfffffffe, 0x3fffffff}} /* ALL_REGS */ 232 233 /* Defines invalid mode changes. */ 234 235 #define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \ 236 pa_cannot_change_mode_class (FROM, TO, CLASS) 237 238 /* Return the class number of the smallest class containing 239 reg number REGNO. This could be a conditional expression 240 or could index an array. */ 241 242 #define REGNO_REG_CLASS(REGNO) \ 243 ((REGNO) == 0 ? NO_REGS \ 244 : (REGNO) == 1 ? R1_REGS \ 245 : (REGNO) < 32 || (REGNO) == 61 ? GENERAL_REGS \ 246 : (REGNO) < 60 ? FP_REGS \ 247 : SHIFT_REGS) 248 249 /* Return the maximum number of consecutive registers 250 needed to represent mode MODE in a register of class CLASS. */ 251 #define CLASS_MAX_NREGS(CLASS, MODE) \ 252 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) 253 254 /* 1 if N is a possible register number for function argument passing. */ 255 256 #define FUNCTION_ARG_REGNO_P(N) \ 257 ((((N) >= 19) && (N) <= 26) \ 258 || (! TARGET_SOFT_FLOAT && (N) >= 32 && (N) <= 39)) 259 260 /* How to refer to registers in assembler output. 261 This sequence is indexed by compiler's hard-register-number (see above). */ 262 263 #define REGISTER_NAMES \ 264 {"%r0", "%r1", "%r2", "%r3", "%r4", "%r5", "%r6", "%r7", \ 265 "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15", \ 266 "%r16", "%r17", "%r18", "%r19", "%r20", "%r21", "%r22", "%r23", \ 267 "%r24", "%r25", "%r26", "%r27", "%r28", "%r29", "%r30", "%r31", \ 268 "%fr4", "%fr5", "%fr6", "%fr7", "%fr8", "%fr9", "%fr10", "%fr11", \ 269 "%fr12", "%fr13", "%fr14", "%fr15", "%fr16", "%fr17", "%fr18", "%fr19", \ 270 "%fr20", "%fr21", "%fr22", "%fr23", "%fr24", "%fr25", "%fr26", "%fr27", \ 271 "%fr28", "%fr29", "%fr30", "%fr31", "SAR", "sfp"} 272 273 #define ADDITIONAL_REGISTER_NAMES \ 274 {{"%cr11",60}} 275 276 #define FP_SAVED_REG_LAST 49 277 #define FP_SAVED_REG_FIRST 40 278 #define FP_REG_STEP 1 279 #define FP_REG_FIRST 32 280 #define FP_REG_LAST 59 281