gcc/config/nvptx/nvptx.h

   1 /* Target Definitions for NVPTX.
   2    Copyright (C) 2014-2021 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 #define STARTFILE_SPEC "%{mmainkernel:crt0.o}"
  31
  32 /* Default needs to be in sync with default for misa in nvptx.opt.
  33    We add a default here to work around a hard-coded sm_30 default in
  34    nvptx-as.  */
  35 #define ASM_SPEC "%{misa=*:-m %*; :-m sm_35}"
  36
  37 #define TARGET_CPU_CPP_BUILTINS()               \
  38   do                                            \
  39     {                                           \
  40       builtin_assert ("machine=nvptx");         \
  41       builtin_assert ("cpu=nvptx");             \
  42       builtin_define ("__nvptx__");             \
  43       if (TARGET_SOFT_STACK)                    \
  44         builtin_define ("__nvptx_softstack__"); \
  45       if (TARGET_UNIFORM_SIMT)                  \
  46         builtin_define ("__nvptx_unisimt__");   \
  47     } while (0)
  48
  49 /* Avoid the default in ../../gcc.c, which adds "-pthread", which is not
  50    supported for nvptx.  */
  51 #define GOMP_SELF_SPECS ""
  52
  53 /* Storage Layout.  */
  54
  55 #define BITS_BIG_ENDIAN 0
  56 #define BYTES_BIG_ENDIAN 0
  57 #define WORDS_BIG_ENDIAN 0
  58
  59 /* Chosen such that we won't have to deal with multi-word subregs.  */
  60 #define UNITS_PER_WORD 8
  61
  62 /* Alignments in bits.  */
  63 #define PARM_BOUNDARY 32
  64 #define STACK_BOUNDARY 128
  65 #define FUNCTION_BOUNDARY 32
  66 #define BIGGEST_ALIGNMENT 128
  67 #define STRICT_ALIGNMENT 1
  68
  69 #define MAX_STACK_ALIGNMENT (1024 * 8)
  70
  71 #define DATA_ALIGNMENT nvptx_data_alignment
  72
  73 /* Copied from elf.h and other places.  We'd otherwise use
  74    BIGGEST_ALIGNMENT and fail a number of testcases.  */
  75 #define MAX_OFILE_ALIGNMENT (32768 * 8)
  76
  77 /* Type Layout.  */
  78
  79 #define DEFAULT_SIGNED_CHAR 1
  80
  81 #define SHORT_TYPE_SIZE 16
  82 #define INT_TYPE_SIZE 32
  83 #define LONG_TYPE_SIZE (TARGET_ABI64 ? 64 : 32)
  84 #define LONG_LONG_TYPE_SIZE 64
  85 #define FLOAT_TYPE_SIZE 32
  86 #define DOUBLE_TYPE_SIZE 64
  87 #define LONG_DOUBLE_TYPE_SIZE 64
  88 #define TARGET_SUPPORTS_WIDE_INT 1
  89
  90 #undef SIZE_TYPE
  91 #define SIZE_TYPE (TARGET_ABI64 ? "long unsigned int" : "unsigned int")
  92 #undef PTRDIFF_TYPE
  93 #define PTRDIFF_TYPE (TARGET_ABI64 ? "long int" : "int")
  94
  95 #define POINTER_SIZE (TARGET_ABI64 ? 64 : 32)
  96 #define Pmode (TARGET_ABI64 ? DImode : SImode)
  97 #define STACK_SIZE_MODE Pmode
  98
  99 #define TARGET_SM35 (ptx_isa_option >= PTX_ISA_SM35)
 100
 101 /* Registers.  Since ptx is a virtual target, we just define a few
 102    hard registers for special purposes and leave pseudos unallocated.
 103    We have to have some available hard registers, to keep gcc setup
 104    happy.  */
 105 #define FIRST_PSEUDO_REGISTER 16
 106 #define FIXED_REGISTERS     { 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
 107 #define CALL_USED_REGISTERS { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
 108
 109 /* Register Classes.  */
 110 enum reg_class             {  NO_REGS,    ALL_REGS,     LIM_REG_CLASSES };
 111 #define REG_CLASS_NAMES    { "NO_REGS",  "ALL_REGS" }
 112 #define REG_CLASS_CONTENTS { { 0x0000 }, { 0xFFFF } }
 113 #define N_REG_CLASSES (int) LIM_REG_CLASSES
 114
 115 #define GENERAL_REGS ALL_REGS
 116 #define REGNO_REG_CLASS(R) ((void)(R), ALL_REGS)
 117 #define BASE_REG_CLASS ALL_REGS
 118 #define INDEX_REG_CLASS NO_REGS
 119
 120 #define REGNO_OK_FOR_BASE_P(X) true
 121 #define REGNO_OK_FOR_INDEX_P(X) false
 122
 123 #define CLASS_MAX_NREGS(class, mode) \
 124   ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
 125
 126 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)             \
 127   if ((MODE) == QImode || (MODE) == HImode)             \
 128     {                                                   \
 129       (MODE) = SImode;                                  \
 130       (void)(UNSIGNEDP);                                \
 131       (void)(TYPE);                                     \
 132     }
 133
 134 /* Stack and Calling.  */
 135
 136 #define FRAME_GROWS_DOWNWARD 0
 137 #define STACK_GROWS_DOWNWARD 1
 138
 139 #define NVPTX_RETURN_REGNUM 0
 140 #define STACK_POINTER_REGNUM 1
 141 #define FRAME_POINTER_REGNUM 2
 142 #define ARG_POINTER_REGNUM 3
 143 #define STATIC_CHAIN_REGNUM 4
 144 /* This register points to the shared memory location with the current warp's
 145    soft stack pointer (__nvptx_stacks[tid.y]).  */
 146 #define SOFTSTACK_SLOT_REGNUM 5
 147 /* This register is used to save the previous value of the soft stack pointer
 148    in the prologue and restore it when returning.  */
 149 #define SOFTSTACK_PREV_REGNUM 6
 150
 151 #define REGISTER_NAMES                                                  \
 152   {                                                                     \
 153     "%value", "%stack", "%frame", "%args",                              \
 154     "%chain", "%sspslot", "%sspprev", "%hr7",                           \
 155     "%hr8", "%hr9", "%hr10", "%hr11", "%hr12", "%hr13", "%hr14", "%hr15" \
 156   }
 157
 158 #define FIRST_PARM_OFFSET(FNDECL) ((void)(FNDECL), 0)
 159 #define PUSH_ARGS_REVERSED 1
 160 #define ACCUMULATE_OUTGOING_ARGS 1
 161
 162 /* Avoid using the argument pointer for frame-related things.  */
 163 #define FRAME_POINTER_CFA_OFFSET(FNDECL) ((void)(FNDECL), 0)
 164
 165 #ifdef HOST_WIDE_INT
 166 struct nvptx_args {
 167   tree fntype;
 168   /* Number of arguments passed in registers so far.  */
 169   int count;
 170 };
 171 #endif
 172
 173 #define CUMULATIVE_ARGS struct nvptx_args
 174
 175 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
 176   ((CUM).fntype = (FNTYPE), (CUM).count = 0, (void)0)
 177
 178 #define FUNCTION_ARG_REGNO_P(r) 0
 179
 180 #define DEFAULT_PCC_STRUCT_RETURN 0
 181
 182 #define FUNCTION_PROFILER(file, labelno) \
 183   fatal_error (input_location, \
 184                "profiling is not yet implemented for this architecture")
 185
 186 #define TRAMPOLINE_SIZE 32
 187 #define TRAMPOLINE_ALIGNMENT 256
 188 \f
 189 /* We don't run reload, so this isn't actually used, but it still needs to be
 190    defined.  Showing an argp->fp elimination also stops
 191    expand_builtin_setjmp_receiver from generating invalid insns.  */
 192 #define ELIMINABLE_REGS                                 \
 193   {                                                     \
 194     { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM} \
 195   }
 196
 197 /* Define the offset between two registers, one to be eliminated, and the other
 198    its replacement, at the start of a routine.  */
 199
 200 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
 201   ((OFFSET) = 0)
 202 \f
 203 /* Addressing Modes.  */
 204
 205 #define MAX_REGS_PER_ADDRESS 1
 206
 207 #define LEGITIMATE_PIC_OPERAND_P(X) 1
 208 \f
 209
 210 #if defined HOST_WIDE_INT
 211 struct GTY(()) machine_function
 212 {
 213   rtx_expr_list *call_args;  /* Arg list for the current call.  */
 214   bool doing_call; /* Within a CALL_ARGS ... CALL_ARGS_END sequence.  */
 215   bool is_varadic;  /* This call is varadic  */
 216   bool has_varadic;  /* Current function has a varadic call.  */
 217   bool has_chain; /* Current function has outgoing static chain.  */
 218   bool has_softstack; /* Current function has a soft stack frame.  */
 219   bool has_simtreg; /* Current function has an OpenMP SIMD region.  */
 220   int num_args; /* Number of args of current call.  */
 221   int return_mode; /* Return mode of current fn.
 222                       (machine_mode not defined yet.) */
 223   rtx axis_predicate[2]; /* Neutering predicates.  */
 224   int axis_dim[2]; /* Maximum number of threads on each axis, dim[0] is
 225                       vector_length, dim[1] is num_workers.  */
 226   bool axis_dim_init_p;
 227   rtx bcast_partition; /* Register containing the size of each
 228                           vector's partition of share-memory used to
 229                           broadcast state.  */
 230   rtx red_partition; /* Similar to bcast_partition, except for vector
 231                         reductions.  */
 232   rtx sync_bar; /* Synchronization barrier ID for vectors.  */
 233   rtx unisimt_master; /* 'Master lane index' for -muniform-simt.  */
 234   rtx unisimt_predicate; /* Predicate for -muniform-simt.  */
 235   rtx unisimt_location; /* Mask location for -muniform-simt.  */
 236   /* The following two fields hold the maximum size resp. alignment required
 237      for per-lane storage in OpenMP SIMD regions.  */
 238   unsigned HOST_WIDE_INT simt_stack_size;
 239   unsigned HOST_WIDE_INT simt_stack_align;
 240 };
 241 #endif
 242 \f
 243 /* Costs.  */
 244
 245 #define NO_FUNCTION_CSE 1
 246 #define SLOW_BYTE_ACCESS 0
 247 #define BRANCH_COST(speed_p, predictable_p) 6
 248 \f
 249 /* Assembler Format.  */
 250
 251 #undef ASM_DECLARE_FUNCTION_NAME
 252 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 253   nvptx_declare_function_name (FILE, NAME, DECL)
 254
 255 #undef ASM_DECLARE_FUNCTION_SIZE
 256 #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL) \
 257   nvptx_function_end (STREAM)
 258
 259 #define DWARF2_ASM_LINE_DEBUG_INFO 1
 260
 261 #undef ASM_APP_ON
 262 #define ASM_APP_ON "\t// #APP \n"
 263 #undef ASM_APP_OFF
 264 #define ASM_APP_OFF "\t// #NO_APP \n"
 265
 266 #define DBX_REGISTER_NUMBER(N) N
 267
 268 #define TEXT_SECTION_ASM_OP ""
 269 #define DATA_SECTION_ASM_OP ""
 270
 271 #undef  ASM_GENERATE_INTERNAL_LABEL
 272 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM)         \
 273   do                                                            \
 274     {                                                           \
 275       char *__p;                                                \
 276       __p = stpcpy (&(LABEL)[1], PREFIX);                       \
 277       (LABEL)[0] = '$';                                         \
 278       sprint_ul (__p, (unsigned long) (NUM));                   \
 279     }                                                           \
 280   while (0)
 281
 282 #define ASM_OUTPUT_ALIGN(FILE, POWER)           \
 283   do                                            \
 284     {                                           \
 285       (void) (FILE);                            \
 286       (void) (POWER);                           \
 287     }                                           \
 288   while (0)
 289
 290 #define ASM_OUTPUT_SKIP(FILE, N)                \
 291   nvptx_output_skip (FILE, N)
 292
 293 #undef  ASM_OUTPUT_ASCII
 294 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                     \
 295   nvptx_output_ascii (FILE, STR, LENGTH);
 296
 297 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)       \
 298   nvptx_declare_object_name (FILE, NAME, DECL)
 299
 300 #undef  ASM_OUTPUT_ALIGNED_DECL_COMMON
 301 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN)   \
 302   nvptx_output_aligned_decl (FILE, NAME, DECL, SIZE, ALIGN)
 303
 304 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 305 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 306   nvptx_output_aligned_decl (FILE, NAME, DECL, SIZE, ALIGN)
 307
 308 #define CASE_VECTOR_PC_RELATIVE flag_pic
 309 #define JUMP_TABLES_IN_TEXT_SECTION flag_pic
 310
 311 #define ADDR_VEC_ALIGN(VEC) (JUMP_TABLES_IN_TEXT_SECTION ? 5 : 2)
 312
 313 /* Misc.  */
 314
 315 #define DWARF2_LINENO_DEBUGGING_INFO 1
 316
 317 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) \
 318   ((VALUE) = GET_MODE_BITSIZE ((MODE)), 2)
 319 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) \
 320   ((VALUE) = GET_MODE_BITSIZE ((MODE)), 2)
 321
 322 #define SUPPORTS_WEAK 1
 323 #define NO_DOT_IN_LABEL
 324 #define ASM_COMMENT_START "//"
 325
 326 #define STORE_FLAG_VALUE -1
 327 #define FLOAT_STORE_FLAG_VALUE(MODE) REAL_VALUE_ATOF("1.0", (MODE))
 328
 329 #define CASE_VECTOR_MODE SImode
 330 #define MOVE_MAX 8
 331 #define MOVE_RATIO(SPEED) 4
 332 #define FUNCTION_MODE QImode
 333 #define HAS_INIT_SECTION 1
 334
 335 /* The C++ front end insists to link against libstdc++ -- which we don't build.
 336    Tell it to instead link against the innocuous libgcc.  */
 337 #define LIBSTDCXX "gcc"
 338
 339 #endif /* GCC_NVPTX_H */