gcc/optabs.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 2001 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 2, 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 COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef GCC_OPTABS_H
  22 #define GCC_OPTABS_H
  23
  24 #include "insn-codes.h"
  25
  26 /* Optabs are tables saying how to generate insn bodies
  27    for various machine modes and numbers of operands.
  28    Each optab applies to one operation.
  29    For example, add_optab applies to addition.
  30
  31    The insn_code slot is the enum insn_code that says how to
  32    generate an insn for this operation on a particular machine mode.
  33    It is CODE_FOR_nothing if there is no such insn on the target machine.
  34
  35    The `lib_call' slot is the name of the library function that
  36    can be used to perform the operation.
  37
  38    A few optabs, such as move_optab and cmp_optab, are used
  39    by special code.  */
  40
  41 typedef struct optab
  42 {
  43   enum rtx_code code;
  44   struct {
  45     enum insn_code insn_code;
  46     rtx libfunc;
  47   } handlers [NUM_MACHINE_MODES];
  48 } * optab;
  49
  50 /* Given an enum insn_code, access the function to construct
  51    the body of that kind of insn.  */
  52 #define GEN_FCN(CODE) (*insn_data[(int) (CODE)].genfun)
  53
  54 /* Enumeration of valid indexes into optab_table.  */
  55 enum optab_index
  56 {
  57   OTI_add,
  58   OTI_addv,
  59   OTI_sub,
  60   OTI_subv,
  61
  62   /* Signed and fp multiply */
  63   OTI_smul,
  64   OTI_smulv,
  65   /* Signed multiply, return high word */
  66   OTI_smul_highpart,
  67   OTI_umul_highpart,
  68   /* Signed multiply with result one machine mode wider than args */
  69   OTI_smul_widen,
  70   OTI_umul_widen,
  71
  72   /* Signed divide */
  73   OTI_sdiv,
  74   OTI_sdivv,
  75   /* Signed divide-and-remainder in one */
  76   OTI_sdivmod,
  77   OTI_udiv,
  78   OTI_udivmod,
  79   /* Signed remainder */
  80   OTI_smod,
  81   OTI_umod,
  82   /* Convert float to integer in float fmt */
  83   OTI_ftrunc,
  84
  85   /* Logical and */
  86   OTI_and,
  87   /* Logical or */
  88   OTI_ior,
  89   /* Logical xor */
  90   OTI_xor,
  91
  92   /* Arithmetic shift left */
  93   OTI_ashl,
  94   /* Logical shift right */
  95   OTI_lshr,
  96   /* Arithmetic shift right */
  97   OTI_ashr,
  98   /* Rotate left */
  99   OTI_rotl,
 100   /* Rotate right */
 101   OTI_rotr,
 102   /* Signed and floating-point minimum value */
 103   OTI_smin,
 104   /* Signed and floating-point maximum value */
 105   OTI_smax,
 106   /* Unsigned minimum value */
 107   OTI_umin,
 108   /* Unsigned maximum value */
 109   OTI_umax,
 110
 111   /* Move instruction.  */
 112   OTI_mov,
 113   /* Move, preserving high part of register.  */
 114   OTI_movstrict,
 115
 116   /* Unary operations */
 117   /* Negation */
 118   OTI_neg,
 119   OTI_negv,
 120   /* Abs value */
 121   OTI_abs,
 122   OTI_absv,
 123   /* Bitwise not */
 124   OTI_one_cmpl,
 125   /* Find first bit set */
 126   OTI_ffs,
 127   /* Square root */
 128   OTI_sqrt,
 129   /* Sine */
 130   OTI_sin,
 131   /* Cosine */
 132   OTI_cos,
 133
 134   /* Compare insn; two operands.  */
 135   OTI_cmp,
 136   /* Used only for libcalls for unsigned comparisons.  */
 137   OTI_ucmp,
 138   /* tst insn; compare one operand against 0 */
 139   OTI_tst,
 140
 141   /* String length */
 142   OTI_strlen,
 143
 144   /* Combined compare & jump/store flags/move operations.  */
 145   OTI_cbranch,
 146   OTI_cmov,
 147   OTI_cstore,
 148
 149   /* Push instruction.  */
 150   OTI_push,
 151
 152   OTI_MAX
 153 };
 154
 155 extern optab optab_table[OTI_MAX];
 156
 157 #define add_optab (optab_table[OTI_add])
 158 #define sub_optab (optab_table[OTI_sub])
 159 #define smul_optab (optab_table[OTI_smul])
 160 #define addv_optab (optab_table[OTI_addv])
 161 #define subv_optab (optab_table[OTI_subv])
 162 #define smul_highpart_optab (optab_table[OTI_smul_highpart])
 163 #define umul_highpart_optab (optab_table[OTI_umul_highpart])
 164 #define smul_widen_optab (optab_table[OTI_smul_widen])
 165 #define umul_widen_optab (optab_table[OTI_umul_widen])
 166 #define sdiv_optab (optab_table[OTI_sdiv])
 167 #define smulv_optab (optab_table[OTI_smulv])
 168 #define sdivv_optab (optab_table[OTI_sdivv])
 169 #define sdivmod_optab (optab_table[OTI_sdivmod])
 170 #define udiv_optab (optab_table[OTI_udiv])
 171 #define udivmod_optab (optab_table[OTI_udivmod])
 172 #define smod_optab (optab_table[OTI_smod])
 173 #define umod_optab (optab_table[OTI_umod])
 174 #define ftrunc_optab (optab_table[OTI_ftrunc])
 175 #define and_optab (optab_table[OTI_and])
 176 #define ior_optab (optab_table[OTI_ior])
 177 #define xor_optab (optab_table[OTI_xor])
 178 #define ashl_optab (optab_table[OTI_ashl])
 179 #define lshr_optab (optab_table[OTI_lshr])
 180 #define ashr_optab (optab_table[OTI_ashr])
 181 #define rotl_optab (optab_table[OTI_rotl])
 182 #define rotr_optab (optab_table[OTI_rotr])
 183 #define smin_optab (optab_table[OTI_smin])
 184 #define smax_optab (optab_table[OTI_smax])
 185 #define umin_optab (optab_table[OTI_umin])
 186 #define umax_optab (optab_table[OTI_umax])
 187
 188 #define mov_optab (optab_table[OTI_mov])
 189 #define movstrict_optab (optab_table[OTI_movstrict])
 190
 191 #define neg_optab (optab_table[OTI_neg])
 192 #define negv_optab (optab_table[OTI_negv])
 193 #define abs_optab (optab_table[OTI_abs])
 194 #define absv_optab (optab_table[OTI_absv])
 195 #define one_cmpl_optab (optab_table[OTI_one_cmpl])
 196 #define ffs_optab (optab_table[OTI_ffs])
 197 #define sqrt_optab (optab_table[OTI_sqrt])
 198 #define sin_optab (optab_table[OTI_sin])
 199 #define cos_optab (optab_table[OTI_cos])
 200
 201 #define cmp_optab (optab_table[OTI_cmp])
 202 #define ucmp_optab (optab_table[OTI_ucmp])
 203 #define tst_optab (optab_table[OTI_tst])
 204
 205 #define strlen_optab (optab_table[OTI_strlen])
 206
 207 #define cbranch_optab (optab_table[OTI_cbranch])
 208 #define cmov_optab (optab_table[OTI_cmov])
 209 #define cstore_optab (optab_table[OTI_cstore])
 210 #define push_optab (optab_table[OTI_push])
 211
 212 /* Tables of patterns for extending one integer mode to another.  */
 213 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
 214
 215 /* Tables of patterns for converting between fixed and floating point.  */
 216 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 217 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 218 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 219
 220 /* These arrays record the insn_code of insns that may be needed to
 221    perform input and output reloads of special objects.  They provide a
 222    place to pass a scratch register.  */
 223 extern enum insn_code reload_in_optab[NUM_MACHINE_MODES];
 224 extern enum insn_code reload_out_optab[NUM_MACHINE_MODES];
 225
 226 /* Contains the optab used for each rtx code.  */
 227 extern optab code_to_optab[NUM_RTX_CODE + 1];
 228
 229 \f
 230 typedef rtx (*rtxfun) PARAMS ((rtx));
 231
 232 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 233    gives the gen_function to make a branch to test that condition.  */
 234
 235 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
 236
 237 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 238    gives the insn code to make a store-condition insn
 239    to test that condition.  */
 240
 241 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
 242
 243 #ifdef HAVE_conditional_move
 244 /* Indexed by the machine mode, gives the insn code to make a conditional
 245    move insn.  */
 246
 247 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
 248 #endif
 249
 250 /* This array records the insn_code of insns to perform block moves.  */
 251 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
 252
 253 /* This array records the insn_code of insns to perform block clears.  */
 254 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
 255
 256 /* Define functions given in optabs.c.  */
 257
 258 /* Expand a binary operation given optab and rtx operands.  */
 259 extern rtx expand_binop PARAMS ((enum machine_mode, optab, rtx, rtx, rtx,
 260                                  int, enum optab_methods));
 261
 262 /* Expand a binary operation with both signed and unsigned forms.  */
 263 extern rtx sign_expand_binop PARAMS ((enum machine_mode, optab, optab, rtx,
 264                                       rtx, rtx, int, enum optab_methods));
 265
 266 /* Generate code to perform an operation on two operands with two results.  */
 267 extern int expand_twoval_binop PARAMS ((optab, rtx, rtx, rtx, rtx, int));
 268
 269 /* Expand a unary arithmetic operation given optab rtx operand.  */
 270 extern rtx expand_unop PARAMS ((enum machine_mode, optab, rtx, rtx, int));
 271
 272 /* Expand the absolute value operation.  */
 273 extern rtx expand_abs PARAMS ((enum machine_mode, rtx, rtx, int, int));
 274
 275 /* Expand the complex absolute value operation.  */
 276 extern rtx expand_complex_abs PARAMS ((enum machine_mode, rtx, rtx, int));
 277
 278 /* Generate an instruction with a given INSN_CODE with an output and
 279    an input.  */
 280 extern void emit_unop_insn PARAMS ((int, rtx, rtx, enum rtx_code));
 281
 282 /* Emit code to perform a series of operations on a multi-word quantity, one
 283    word at a time.  */
 284 extern rtx emit_no_conflict_block PARAMS ((rtx, rtx, rtx, rtx, rtx));
 285
 286 /* Emit one rtl instruction to store zero in specified rtx.  */
 287 extern void emit_clr_insn PARAMS ((rtx));
 288
 289 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0.  */
 290 extern void emit_0_to_1_insn PARAMS ((rtx));
 291
 292 /* Emit one rtl insn to compare two rtx's.  */
 293 extern void emit_cmp_insn PARAMS ((rtx, rtx, enum rtx_code, rtx,
 294                                    enum machine_mode, int));
 295
 296 /* The various uses that a comparison can have; used by can_compare_p:
 297    jumps, conditional moves, store flag operations.  */
 298 enum can_compare_purpose
 299 {
 300   ccp_jump,
 301   ccp_cmov,
 302   ccp_store_flag
 303 };
 304
 305 /* Nonzero if a compare of mode MODE can be done straightforwardly
 306    (without splitting it into pieces).  */
 307 extern int can_compare_p PARAMS ((enum rtx_code, enum machine_mode,
 308                                   enum can_compare_purpose));
 309
 310 extern rtx prepare_operand PARAMS ((int, rtx, int, enum machine_mode,
 311                                     enum machine_mode, int));
 312
 313 /* Return the INSN_CODE to use for an extend operation.  */
 314 extern enum insn_code can_extend_p PARAMS ((enum machine_mode,
 315                                             enum machine_mode, int));
 316
 317 /* Generate the body of an insn to extend Y (with mode MFROM)
 318    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 319 extern rtx gen_extend_insn PARAMS ((rtx, rtx, enum machine_mode,
 320                                     enum machine_mode, int));
 321
 322 /* Initialize the tables that control conversion between fixed and
 323    floating values.  */
 324 extern void init_fixtab PARAMS ((void));
 325 extern void init_floattab PARAMS ((void));
 326
 327 /* Generate code for a FLOAT_EXPR.  */
 328 extern void expand_float PARAMS ((rtx, rtx, int));
 329
 330 /* Generate code for a FIX_EXPR.  */
 331 extern void expand_fix PARAMS ((rtx, rtx, int));
 332
 333 #endif /* GCC_OPTABS_H */