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