gcc/config/nvptx/nvptx.h

   1 /* Target Definitions for NVPTX.
   2    Copyright (C) 2014-2024 Free Software Foundation, Inc.
   3    Contributed by Bernd Schmidt <bernds@codesourcery.com>
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_NVPTX_H
  22 #define GCC_NVPTX_H
  23
  24 #ifndef NVPTX_OPTS_H
  25 #include "config/nvptx/nvptx-opts.h"
  26 #endif
  27
  28 /* Run-time Target.  */
  29
  30 /* Use '--with-arch' for default '-misa'.  */
  31 #define OPTION_DEFAULT_SPECS \
  32   { "arch", "%{!misa=*:-misa=%(VALUE)}" }, \
  33
  34 /* Assembler supports '-v' option; handle similar to
  35    '../../gcc.cc:asm_options', 'HAVE_GNU_AS'.  */
  36 #define ASM_SPEC "%{v}"
  37
  38 #define STARTFILE_SPEC "%{mmainkernel:crt0.o%s}"
  39
  40 #define TARGET_CPU_CPP_BUILTINS() nvptx_cpu_cpp_builtins ()
  41
  42 /* Avoid the default in ../../gcc.cc, which adds "-pthread", which is not
  43    supported for nvptx.  */
  44 #define GOMP_SELF_SPECS ""
  45
  46 /* Storage Layout.  */
  47
  48 #define BITS_BIG_ENDIAN 0
  49 #define BYTES_BIG_ENDIAN 0
  50 #define WORDS_BIG_ENDIAN 0
  51
  52 /* Chosen such that we won't have to deal with multi-word subregs.  */
  53 #define UNITS_PER_WORD 8
  54
  55 /* Alignments in bits.  */
  56 #define PARM_BOUNDARY 32
  57 #define STACK_BOUNDARY 128
  58 #define FUNCTION_BOUNDARY 32
  59 #define BIGGEST_ALIGNMENT 128
  60 #define STRICT_ALIGNMENT 1
  61
  62 #define MAX_STACK_ALIGNMENT (1024 * 8)
  63
  64 #define DATA_ALIGNMENT nvptx_data_alignment
  65
  66 /* Copied from elf.h and other places.  We'd otherwise use
  67    BIGGEST_ALIGNMENT and fail a number of testcases.  */
  68 #define MAX_OFILE_ALIGNMENT (32768 * 8)
  69
  70 /* Type Layout.  */
  71
  72 #define DEFAULT_SIGNED_CHAR 1
  73
  74 #define SHORT_TYPE_SIZE 16
  75 #define INT_TYPE_SIZE 32
  76 #define LONG_TYPE_SIZE (TARGET_ABI64 ? 64 : 32)
  77 #define LONG_LONG_TYPE_SIZE 64
  78 #define FLOAT_TYPE_SIZE 32
  79 #define DOUBLE_TYPE_SIZE 64
  80 #define LONG_DOUBLE_TYPE_SIZE 64
  81 #define TARGET_SUPPORTS_WIDE_INT 1
  82
  83 #undef SIZE_TYPE
  84 #define SIZE_TYPE (TARGET_ABI64 ? "long unsigned int" : "unsigned int")
  85 #undef PTRDIFF_TYPE
  86 #define PTRDIFF_TYPE (TARGET_ABI64 ? "long int" : "int")
  87
  88 #define POINTER_SIZE (TARGET_ABI64 ? 64 : 32)
  89 #define Pmode (TARGET_ABI64 ? DImode : SImode)
  90 #define STACK_SIZE_MODE Pmode
  91
  92 #include "nvptx-gen.h"
  93
  94 #define TARGET_PTX_6_0 (ptx_version_option >= PTX_VERSION_6_0)
  95 #define TARGET_PTX_6_3 (ptx_version_option >= PTX_VERSION_6_3)
  96 #define TARGET_PTX_7_0 (ptx_version_option >= PTX_VERSION_7_0)
  97
  98 /* Registers.  Since ptx is a virtual target, we just define a few
  99    hard registers for special purposes and leave pseudos unallocated.
 100    We have to have some available hard registers, to keep gcc setup
 101    happy.  */
 102 #define FIRST_PSEUDO_REGISTER 16
 103 #define FIXED_REGISTERS     { 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
 104 #define CALL_USED_REGISTERS { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
 105
 106 /* Register Classes.  */
 107 enum reg_class             {  NO_REGS,    ALL_REGS,     LIM_REG_CLASSES };
 108 #define REG_CLASS_NAMES    { "NO_REGS",  "ALL_REGS" }
 109 #define REG_CLASS_CONTENTS { { 0x0000 }, { 0xFFFF } }
 110 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 111
 112 #define GENERAL_REGS ALL_REGS
 113 #define REGNO_REG_CLASS(R) ((void)(R), ALL_REGS)
 114 #define BASE_REG_CLASS ALL_REGS
 115 #define INDEX_REG_CLASS NO_REGS
 116
 117 #define REGNO_OK_FOR_BASE_P(X) true
 118 #define REGNO_OK_FOR_INDEX_P(X) false
 119
 120 #define CLASS_MAX_NREGS(class, mode) \
 121   ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 122
 123 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)             \
 124   if ((MODE) == QImode || (MODE) == HImode)             \
 125     {                                                   \
 126       (MODE) = SImode;                                  \
 127       (void)(UNSIGNEDP);                                \
 128       (void)(TYPE);                                     \
 129     }
 130
 131 /* Stack and Calling.  */
 132
 133 #define FRAME_GROWS_DOWNWARD 0
 134 #define STACK_GROWS_DOWNWARD 1
 135
 136 #define NVPTX_RETURN_REGNUM 0
 137 #define STACK_POINTER_REGNUM 1
 138 #define FRAME_POINTER_REGNUM 2
 139 #define ARG_POINTER_REGNUM 3
 140 #define STATIC_CHAIN_REGNUM 4
 141 /* This register points to the shared memory location with the current warp's
 142    soft stack pointer (__nvptx_stacks[tid.y]).  */
 143 #define SOFTSTACK_SLOT_REGNUM 5
 144 /* This register is used to save the previous value of the soft stack pointer
 145    in the prologue and restore it when returning.  */
 146 #define SOFTSTACK_PREV_REGNUM 6
 147
 148 #define REGISTER_NAMES                                                  \
 149   {                                                                     \
 150     "%value", "%stack", "%frame", "%args",                              \
 151     "%chain", "%sspslot", "%sspprev", "%hr7",                           \
 152     "%hr8", "%hr9", "%hr10", "%hr11", "%hr12", "%hr13", "%hr14", "%hr15" \
 153   }
 154
 155 #define FIRST_PARM_OFFSET(FNDECL) ((void)(FNDECL), 0)
 156 #define PUSH_ARGS_REVERSED 1
 157 #define ACCUMULATE_OUTGOING_ARGS 1
 158
 159 /* Avoid using the argument pointer for frame-related things.  */
 160 #define FRAME_POINTER_CFA_OFFSET(FNDECL) ((void)(FNDECL), 0)
 161
 162 #ifdef HOST_WIDE_INT
 163 struct nvptx_args {
 164   tree fntype;
 165   /* Number of arguments passed in registers so far.  */
 166   int count;
 167 };
 168 #endif
 169
 170 #define CUMULATIVE_ARGS struct nvptx_args
 171
 172 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 173   ((CUM).fntype = (FNTYPE), (CUM).count = 0, (void)0)
 174
 175 #define FUNCTION_ARG_REGNO_P(r) 0
 176
 177 #define DEFAULT_PCC_STRUCT_RETURN 0
 178
 179 #define FUNCTION_PROFILER(file, labelno) \
 180   fatal_error (input_location, \
 181                "profiling is not yet implemented for this architecture")
 182
 183 #define TRAMPOLINE_SIZE 32
 184 #define TRAMPOLINE_ALIGNMENT 256
 185 \f
 186 /* We don't run reload, so this isn't actually used, but it still needs to be
 187    defined.  Showing an argp->fp elimination also stops
 188    expand_builtin_setjmp_receiver from generating invalid insns.  */
 189 #define ELIMINABLE_REGS                                 \
 190   {                                                     \
 191     { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM} \
 192   }
 193
 194 /* Define the offset between two registers, one to be eliminated, and the other
 195    its replacement, at the start of a routine.  */
 196
 197 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 198   ((OFFSET) = 0)
 199 \f
 200 /* Addressing Modes.  */
 201
 202 #define MAX_REGS_PER_ADDRESS 1
 203
 204 #define LEGITIMATE_PIC_OPERAND_P(X) 1
 205 \f
 206
 207 #if defined HOST_WIDE_INT
 208 struct GTY(()) machine_function
 209 {
 210   rtx_expr_list *call_args;  /* Arg list for the current call.  */
 211   bool doing_call; /* Within a CALL_ARGS ... CALL_ARGS_END sequence.  */
 212   bool is_variadic;  /* This call is variadic  */
 213   bool has_variadic;  /* Current function has a variadic call.  */
 214   bool has_chain; /* Current function has outgoing static chain.  */
 215   bool has_softstack; /* Current function has a soft stack frame.  */
 216   bool has_simtreg; /* Current function has an OpenMP SIMD region.  */
 217   int num_args; /* Number of args of current call.  */
 218   int return_mode; /* Return mode of current fn.
 219                       (machine_mode not defined yet.) */
 220   rtx axis_predicate[2]; /* Neutering predicates.  */
 221   int axis_dim[2]; /* Maximum number of threads on each axis, dim[0] is
 222                       vector_length, dim[1] is num_workers.  */
 223   bool axis_dim_init_p;
 224   rtx bcast_partition; /* Register containing the size of each
 225                           vector's partition of share-memory used to
 226                           broadcast state.  */
 227   rtx red_partition; /* Similar to bcast_partition, except for vector
 228                         reductions.  */
 229   rtx sync_bar; /* Synchronization barrier ID for vectors.  */
 230   rtx unisimt_master; /* 'Master lane index' for -muniform-simt.  */
 231   rtx unisimt_predicate; /* Predicate for -muniform-simt.  */
 232   rtx unisimt_outside_simt_predicate; /* Predicate for -muniform-simt.  */
 233   rtx unisimt_location; /* Mask location for -muniform-simt.  */
 234   /* The following two fields hold the maximum size resp. alignment required
 235      for per-lane storage in OpenMP SIMD regions.  */
 236   unsigned HOST_WIDE_INT simt_stack_size;
 237   unsigned HOST_WIDE_INT simt_stack_align;
 238 };
 239 #endif
 240 \f
 241 /* Costs.  */
 242
 243 #define NO_FUNCTION_CSE 1
 244 #define SLOW_BYTE_ACCESS 0
 245 #define BRANCH_COST(speed_p, predictable_p) 6
 246 \f
 247 /* Assembler Format.  */
 248
 249 #undef ASM_DECLARE_FUNCTION_NAME
 250 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 251   nvptx_declare_function_name (FILE, NAME, DECL)
 252
 253 #undef ASM_DECLARE_FUNCTION_SIZE
 254 #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL) \
 255   nvptx_function_end (STREAM)
 256
 257 #define DWARF2_ASM_LINE_DEBUG_INFO 1
 258
 259 #undef ASM_APP_ON
 260 #define ASM_APP_ON "\t// #APP \n"
 261 #undef ASM_APP_OFF
 262 #define ASM_APP_OFF "\t// #NO_APP \n"
 263
 264 #define DEBUGGER_REGNO(N) N
 265
 266 #define TEXT_SECTION_ASM_OP ""
 267 #define DATA_SECTION_ASM_OP ""
 268
 269 #undef  ASM_GENERATE_INTERNAL_LABEL
 270 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM)         \
 271   do                                                            \
 272     {                                                           \
 273       char *__p;                                                \
 274       __p = stpcpy (&(LABEL)[1], PREFIX);                       \
 275       (LABEL)[0] = '$';                                         \
 276       sprint_ul (__p, (unsigned long) (NUM));                   \
 277     }                                                           \
 278   while (0)
 279
 280 #define ASM_OUTPUT_ALIGN(FILE, POWER)           \
 281   do                                            \
 282     {                                           \
 283       (void) (FILE);                            \
 284       (void) (POWER);                           \
 285     }                                           \
 286   while (0)
 287
 288 #define ASM_OUTPUT_SKIP(FILE, N)                \
 289   nvptx_output_skip (FILE, N)
 290
 291 #undef  ASM_OUTPUT_ASCII
 292 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                     \
 293   nvptx_output_ascii (FILE, STR, LENGTH);
 294
 295 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)       \
 296   nvptx_declare_object_name (FILE, NAME, DECL)
 297
 298 #undef  ASM_OUTPUT_ALIGNED_DECL_COMMON
 299 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN)   \
 300   nvptx_output_aligned_decl (FILE, NAME, DECL, SIZE, ALIGN)
 301
 302 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 303 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 304   nvptx_output_aligned_decl (FILE, NAME, DECL, SIZE, ALIGN)
 305
 306 #define CASE_VECTOR_PC_RELATIVE flag_pic
 307 #define JUMP_TABLES_IN_TEXT_SECTION flag_pic
 308
 309 #define ADDR_VEC_ALIGN(VEC) (JUMP_TABLES_IN_TEXT_SECTION ? 5 : 2)
 310
 311 /* Misc.  */
 312
 313 #define DWARF2_LINENO_DEBUGGING_INFO 1
 314
 315 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) \
 316   ((VALUE) = GET_MODE_BITSIZE ((MODE)), 2)
 317 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) \
 318   ((VALUE) = GET_MODE_BITSIZE ((MODE)), 2)
 319
 320 #define SUPPORTS_WEAK 1
 321
 322 #define MAKE_DECL_ONE_ONLY(DECL) \
 323   (DECL_WEAK (DECL) = 1)
 324
 325 /* The documentation states that ASM_OUTPUT_DEF_FROM_DECLS is used in
 326    preference to ASM_OUTPUT_DEF if the tree nodes are available.  However, we
 327    need the tree nodes to emit the prototype, so at this point it's not clear
 328    how we can support ASM_OUTPUT_DEF.  Still, we need to define it, or
 329    ASM_OUTPUT_DEF_FROM_DECLS is ignored.  For now, assert, and once we run
 330    into it possibly improve by somehow emitting the prototype elsewhere, or
 331    emitting a reasonable error message.  */
 332 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)      \
 333   do                                            \
 334     {                                           \
 335       (void) (FILE);                            \
 336       (void) (LABEL1);                          \
 337       (void) (LABEL2);                          \
 338       gcc_unreachable ();                       \
 339     }                                           \
 340   while (0)
 341 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, NAME, VALUE)  \
 342   nvptx_asm_output_def_from_decls (STREAM, NAME, VALUE)
 343
 344 /* ..., but also override other macros to avoid 'gcc/defaults.h'-initialization
 345    due to that dummy 'ASM_OUTPUT_DEF'.  */
 346 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) TARGET_SUPPORTS_ALIASES
 347 #define TARGET_SUPPORTS_ALIASES (nvptx_alias != 0)
 348
 349 #define NO_DOT_IN_LABEL
 350 #define ASM_COMMENT_START "//"
 351
 352 #define STORE_FLAG_VALUE 1
 353 #define FLOAT_STORE_FLAG_VALUE(MODE) REAL_VALUE_ATOF("1.0", (MODE))
 354
 355 #define CASE_VECTOR_MODE SImode
 356 #define MOVE_MAX 8
 357 #define MOVE_RATIO(SPEED) 4
 358 #define FUNCTION_MODE QImode
 359 #define HAS_INIT_SECTION 1
 360
 361 /* The C++ front end insists to link against libstdc++ -- which we don't build.
 362    Tell it to instead link against the innocuous libgcc.  */
 363 #define LIBSTDCXX "gcc"
 364
 365 #endif /* GCC_NVPTX_H */