gcc/config/riscv/bitmanip.md

   1 ;; Machine description for RISC-V Bit Manipulation operations.
   2 ;; Copyright (C) 2021-2022 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 ;; ZBA extension.
  21
  22 (define_insn "*zero_extendsidi2_bitmanip"
  23   [(set (match_operand:DI 0 "register_operand" "=r,r")
  24         (zero_extend:DI (match_operand:SI 1 "nonimmediate_operand" "r,m")))]
  25   "TARGET_64BIT && TARGET_ZBA"
  26   "@
  27    zext.w\t%0,%1
  28    lwu\t%0,%1"
  29   [(set_attr "type" "bitmanip,load")
  30    (set_attr "mode" "DI")])
  31
  32 (define_insn "*shNadd"
  33   [(set (match_operand:X 0 "register_operand" "=r")
  34         (plus:X (ashift:X (match_operand:X 1 "register_operand" "r")
  35                           (match_operand:QI 2 "imm123_operand" "Ds3"))
  36                 (match_operand:X 3 "register_operand" "r")))]
  37   "TARGET_ZBA"
  38   "sh%2add\t%0,%1,%3"
  39   [(set_attr "type" "bitmanip")
  40    (set_attr "mode" "<X:MODE>")])
  41
  42 ; When using strength-reduction, we will reduce a multiplication to a
  43 ; sequence of shifts and adds.  If this is performed with 32-bit types
  44 ; and followed by a division, the lack of w-form sh[123]add will make
  45 ; combination impossible and lead to a slli + addw being generated.
  46 ; Split the sequence with the knowledge that a w-form div will perform
  47 ; implicit sign-extensions.
  48 (define_split
  49   [(set (match_operand:DI 0 "register_operand")
  50         (sign_extend:DI (div:SI (plus:SI (subreg:SI (ashift:DI (match_operand:DI 1 "register_operand")
  51                                                                (match_operand:QI 2 "imm123_operand")) 0)
  52                                                     (subreg:SI (match_operand:DI 3 "register_operand") 0))
  53                 (subreg:SI (match_operand:DI 4 "register_operand") 0))))
  54    (clobber (match_operand:DI 5 "register_operand"))]
  55   "TARGET_64BIT && TARGET_ZBA"
  56    [(set (match_dup 5) (plus:DI (ashift:DI (match_dup 1) (match_dup 2)) (match_dup 3)))
  57     (set (match_dup 0) (sign_extend:DI (div:SI (subreg:SI (match_dup 5) 0) (subreg:SI (match_dup 4) 0))))])
  58
  59 ; Zba does not provide W-forms of sh[123]add(.uw)?, which leads to an
  60 ; interesting irregularity: we can generate a signed 32-bit result
  61 ; using slli(.uw)?+ addw, but a unsigned 32-bit result can be more
  62 ; efficiently be generated as sh[123]add+zext.w (the .uw can be
  63 ; dropped, if we zero-extend the output anyway).
  64 ;
  65 ; To enable this optimization, we split [ slli(.uw)?, addw, zext.w ]
  66 ; into [ sh[123]add, zext.w ] for use during combine.
  67 (define_split
  68   [(set (match_operand:DI 0 "register_operand")
  69         (zero_extend:DI (plus:SI (ashift:SI (subreg:SI (match_operand:DI 1 "register_operand") 0)
  70                                                        (match_operand:QI 2 "imm123_operand"))
  71                                  (subreg:SI (match_operand:DI 3 "register_operand") 0))))]
  72   "TARGET_64BIT && TARGET_ZBA"
  73   [(set (match_dup 0) (plus:DI (ashift:DI (match_dup 1) (match_dup 2)) (match_dup 3)))
  74    (set (match_dup 0) (zero_extend:DI (subreg:SI (match_dup 0) 0)))])
  75
  76 (define_split
  77   [(set (match_operand:DI 0 "register_operand")
  78         (zero_extend:DI (plus:SI (subreg:SI (and:DI (ashift:DI (match_operand:DI 1 "register_operand")
  79                                                                (match_operand:QI 2 "imm123_operand"))
  80                                                     (match_operand:DI 3 "consecutive_bits_operand")) 0)
  81                                  (subreg:SI (match_operand:DI 4 "register_operand") 0))))]
  82   "TARGET_64BIT && TARGET_ZBA
  83    && riscv_shamt_matches_mask_p (INTVAL (operands[2]), INTVAL (operands[3]))"
  84   [(set (match_dup 0) (plus:DI (ashift:DI (match_dup 1) (match_dup 2)) (match_dup 4)))
  85    (set (match_dup 0) (zero_extend:DI (subreg:SI (match_dup 0) 0)))])
  86
  87 ; Make sure that an andi followed by a sh[123]add remains a two instruction
  88 ; sequence--and is not torn apart into slli, slri, add.
  89 (define_insn_and_split "*andi_add.uw"
  90   [(set (match_operand:DI 0 "register_operand" "=r")
  91         (plus:DI (and:DI (ashift:DI (match_operand:DI 1 "register_operand" "r")
  92                                     (match_operand:QI 2 "imm123_operand" "Ds3"))
  93                          (match_operand:DI 3 "consecutive_bits_operand" ""))
  94                  (match_operand:DI 4 "register_operand" "r")))
  95    (clobber (match_scratch:DI 5 "=&r"))]
  96   "TARGET_64BIT && TARGET_ZBA
  97    && riscv_shamt_matches_mask_p (INTVAL (operands[2]), INTVAL (operands[3]))
  98    && SMALL_OPERAND (INTVAL (operands[3]) >> INTVAL (operands[2]))"
  99   "#"
 100   "&& reload_completed"
 101   [(set (match_dup 5) (and:DI (match_dup 1) (match_dup 3)))
 102    (set (match_dup 0) (plus:DI (ashift:DI (match_dup 5) (match_dup 2))
 103                                (match_dup 4)))]
 104 {
 105         operands[3] = GEN_INT (INTVAL (operands[3]) >> INTVAL (operands[2]));
 106 })
 107
 108 (define_insn "*shNadduw"
 109   [(set (match_operand:DI 0 "register_operand" "=r")
 110         (plus:DI
 111           (and:DI (ashift:DI (match_operand:DI 1 "register_operand" "r")
 112                              (match_operand:QI 2 "imm123_operand" "Ds3"))
 113                  (match_operand 3 "immediate_operand" "n"))
 114           (match_operand:DI 4 "register_operand" "r")))]
 115   "TARGET_64BIT && TARGET_ZBA
 116    && (INTVAL (operands[3]) >> INTVAL (operands[2])) == 0xffffffff"
 117   "sh%2add.uw\t%0,%1,%4"
 118   [(set_attr "type" "bitmanip")
 119    (set_attr "mode" "DI")])
 120
 121 ;; During combine, we may encounter an attempt to combine
 122 ;;   slli rtmp, rs, #imm
 123 ;;   zext.w rtmp, rtmp
 124 ;;   sh[123]add rd, rtmp, rs2
 125 ;; which will lead to the immediate not satisfying the above constraints.
 126 ;; By splitting the compound expression, we can simplify to a slli and a
 127 ;; sh[123]add.uw.
 128 (define_split
 129   [(set (match_operand:DI 0 "register_operand")
 130         (plus:DI (and:DI (ashift:DI (match_operand:DI 1 "register_operand")
 131                                     (match_operand:QI 2 "immediate_operand"))
 132                          (match_operand:DI 3 "consecutive_bits_operand"))
 133                  (match_operand:DI 4 "register_operand")))
 134    (clobber (match_operand:DI 5 "register_operand"))]
 135   "TARGET_64BIT && TARGET_ZBA"
 136   [(set (match_dup 5) (ashift:DI (match_dup 1) (match_dup 6)))
 137    (set (match_dup 0) (plus:DI (and:DI (ashift:DI (match_dup 5)
 138                                                   (match_dup 7))
 139                                        (match_dup 8))
 140                                (match_dup 4)))]
 141 {
 142         unsigned HOST_WIDE_INT mask = UINTVAL (operands[3]);
 143         /* scale: shift within the sh[123]add.uw */
 144         unsigned HOST_WIDE_INT scale = 32 - clz_hwi (mask);
 145         /* bias:  pre-scale amount (i.e. the prior shift amount) */
 146         int bias = ctz_hwi (mask) - scale;
 147
 148         /* If the bias + scale don't add up to operand[2], reject. */
 149         if ((scale + bias) != UINTVAL (operands[2]))
 150            FAIL;
 151
 152         /* If the shift-amount is out-of-range for sh[123]add.uw, reject. */
 153         if ((scale < 1) || (scale > 3))
 154            FAIL;
 155
 156         /* If there's no bias, the '*shNadduw' pattern should have matched. */
 157         if (bias == 0)
 158            FAIL;
 159
 160         operands[6] = GEN_INT (bias);
 161         operands[7] = GEN_INT (scale);
 162         operands[8] = GEN_INT (0xffffffffULL << scale);
 163 })
 164
 165 (define_insn "*add.uw"
 166   [(set (match_operand:DI 0 "register_operand" "=r")
 167         (plus:DI (zero_extend:DI
 168                    (match_operand:SI 1 "register_operand" "r"))
 169                  (match_operand:DI 2 "register_operand" "r")))]
 170   "TARGET_64BIT && TARGET_ZBA"
 171   "add.uw\t%0,%1,%2"
 172   [(set_attr "type" "bitmanip")
 173    (set_attr "mode" "DI")])
 174
 175 (define_insn "*slliuw"
 176   [(set (match_operand:DI 0 "register_operand" "=r")
 177         (and:DI (ashift:DI (match_operand:DI 1 "register_operand" "r")
 178                            (match_operand:QI 2 "immediate_operand" "I"))
 179                 (match_operand 3 "immediate_operand" "n")))]
 180   "TARGET_64BIT && TARGET_ZBA
 181    && (INTVAL (operands[3]) >> INTVAL (operands[2])) == 0xffffffff"
 182   "slli.uw\t%0,%1,%2"
 183   [(set_attr "type" "bitmanip")
 184    (set_attr "mode" "DI")])
 185
 186 ;; ZBB extension.
 187
 188 (define_insn "*<optab>_not<mode>"
 189   [(set (match_operand:X 0 "register_operand" "=r")
 190         (bitmanip_bitwise:X (not:X (match_operand:X 1 "register_operand" "r"))
 191                             (match_operand:X 2 "register_operand" "r")))]
 192   "TARGET_ZBB"
 193   "<insn>n\t%0,%2,%1"
 194   [(set_attr "type" "bitmanip")
 195    (set_attr "mode" "<X:MODE>")])
 196
 197 ;; '(a >= 0) ? b : 0' is emitted branchless (from if-conversion).  Without a
 198 ;; bit of extra help for combine (i.e., the below split), we end up emitting
 199 ;; not/srai/and instead of combining the not into an andn.
 200 (define_split
 201   [(set (match_operand:DI 0 "register_operand")
 202         (and:DI (neg:DI (ge:DI (match_operand:DI 1 "register_operand")
 203                                (const_int 0)))
 204                 (match_operand:DI 2 "register_operand")))
 205    (clobber (match_operand:DI 3 "register_operand"))]
 206   "TARGET_ZBB"
 207   [(set (match_dup 3) (ashiftrt:DI (match_dup 1) (const_int 63)))
 208    (set (match_dup 0) (and:DI (not:DI (match_dup 3)) (match_dup 2)))])
 209
 210 (define_insn "*xor_not<mode>"
 211   [(set (match_operand:X 0 "register_operand" "=r")
 212         (not:X (xor:X (match_operand:X 1 "register_operand" "r")
 213                       (match_operand:X 2 "register_operand" "r"))))]
 214   "TARGET_ZBB"
 215   "xnor\t%0,%1,%2"
 216   [(set_attr "type" "bitmanip")
 217    (set_attr "mode" "<X:MODE>")])
 218
 219 (define_insn "<bitmanip_optab>si2"
 220   [(set (match_operand:SI 0 "register_operand" "=r")
 221         (clz_ctz_pcnt:SI (match_operand:SI 1 "register_operand" "r")))]
 222   "TARGET_ZBB"
 223   "<bitmanip_insn>%~\t%0,%1"
 224   [(set_attr "type" "bitmanip")
 225    (set_attr "mode" "SI")])
 226
 227 (define_insn "*<bitmanip_optab>disi2"
 228   [(set (match_operand:DI 0 "register_operand" "=r")
 229         (sign_extend:DI
 230           (clz_ctz_pcnt:SI (match_operand:SI 1 "register_operand" "r"))))]
 231   "TARGET_64BIT && TARGET_ZBB"
 232   "<bitmanip_insn>w\t%0,%1"
 233   [(set_attr "type" "bitmanip")
 234    (set_attr "mode" "SI")])
 235
 236 (define_insn "<bitmanip_optab>di2"
 237   [(set (match_operand:DI 0 "register_operand" "=r")
 238         (clz_ctz_pcnt:DI (match_operand:DI 1 "register_operand" "r")))]
 239   "TARGET_64BIT && TARGET_ZBB"
 240   "<bitmanip_insn>\t%0,%1"
 241   [(set_attr "type" "bitmanip")
 242    (set_attr "mode" "DI")])
 243
 244 (define_insn "*zero_extendhi<GPR:mode>2_bitmanip"
 245   [(set (match_operand:GPR 0 "register_operand" "=r,r")
 246         (zero_extend:GPR (match_operand:HI 1 "nonimmediate_operand" "r,m")))]
 247   "TARGET_ZBB"
 248   "@
 249    zext.h\t%0,%1
 250    lhu\t%0,%1"
 251   [(set_attr "type" "bitmanip,load")
 252    (set_attr "mode" "<GPR:MODE>")])
 253
 254 (define_insn "*extend<SHORT:mode><SUPERQI:mode>2_zbb"
 255   [(set (match_operand:SUPERQI   0 "register_operand"     "=r,r")
 256         (sign_extend:SUPERQI
 257             (match_operand:SHORT 1 "nonimmediate_operand" " r,m")))]
 258   "TARGET_ZBB"
 259   "@
 260    sext.<SHORT:size>\t%0,%1
 261    l<SHORT:size>\t%0,%1"
 262   [(set_attr "type" "bitmanip,load")
 263    (set_attr "mode" "<SUPERQI:MODE>")])
 264
 265 (define_insn "*zero_extendhi<GPR:mode>2_zbb"
 266   [(set (match_operand:GPR    0 "register_operand"     "=r,r")
 267         (zero_extend:GPR
 268             (match_operand:HI 1 "nonimmediate_operand" " r,m")))]
 269   "TARGET_ZBB"
 270   "@
 271    zext.h\t%0,%1
 272    lhu\t%0,%1"
 273   [(set_attr "type" "bitmanip,load")
 274    (set_attr "mode" "HI")])
 275
 276 (define_insn "rotrsi3"
 277   [(set (match_operand:SI 0 "register_operand" "=r")
 278         (rotatert:SI (match_operand:SI 1 "register_operand" "r")
 279                      (match_operand:QI 2 "arith_operand" "rI")))]
 280   "TARGET_ZBB"
 281   "ror%i2%~\t%0,%1,%2"
 282   [(set_attr "type" "bitmanip")])
 283
 284 (define_insn "rotrdi3"
 285   [(set (match_operand:DI 0 "register_operand" "=r")
 286         (rotatert:DI (match_operand:DI 1 "register_operand" "r")
 287                      (match_operand:QI 2 "arith_operand" "rI")))]
 288   "TARGET_64BIT && TARGET_ZBB"
 289   "ror%i2\t%0,%1,%2"
 290   [(set_attr "type" "bitmanip")])
 291
 292 (define_insn "rotrsi3_sext"
 293   [(set (match_operand:DI 0 "register_operand" "=r")
 294         (sign_extend:DI (rotatert:SI (match_operand:SI 1 "register_operand" "r")
 295                                      (match_operand:QI 2 "register_operand" "r"))))]
 296   "TARGET_64BIT && TARGET_ZBB"
 297   "rorw\t%0,%1,%2"
 298   [(set_attr "type" "bitmanip")])
 299
 300 (define_insn "rotlsi3"
 301   [(set (match_operand:SI 0 "register_operand" "=r")
 302         (rotate:SI (match_operand:SI 1 "register_operand" "r")
 303                    (match_operand:QI 2 "register_operand" "r")))]
 304   "TARGET_ZBB"
 305   "rol%~\t%0,%1,%2"
 306   [(set_attr "type" "bitmanip")])
 307
 308 (define_insn "rotldi3"
 309   [(set (match_operand:DI 0 "register_operand" "=r")
 310         (rotate:DI (match_operand:DI 1 "register_operand" "r")
 311                    (match_operand:QI 2 "register_operand" "r")))]
 312   "TARGET_64BIT && TARGET_ZBB"
 313   "rol\t%0,%1,%2"
 314   [(set_attr "type" "bitmanip")])
 315
 316 (define_insn "rotlsi3_sext"
 317   [(set (match_operand:DI 0 "register_operand" "=r")
 318         (sign_extend:DI (rotate:SI (match_operand:SI 1 "register_operand" "r")
 319                                    (match_operand:QI 2 "register_operand" "r"))))]
 320   "TARGET_64BIT && TARGET_ZBB"
 321   "rolw\t%0,%1,%2"
 322   [(set_attr "type" "bitmanip")])
 323
 324 ;; orc.b (or-combine) is added as an unspec for the benefit of the support
 325 ;; for optimized string functions (such as strcmp).
 326 (define_insn "orcb<mode>2"
 327   [(set (match_operand:X 0 "register_operand" "=r")
 328         (unspec:X [(match_operand:X 1 "register_operand" "r")] UNSPEC_ORC_B))]
 329   "TARGET_ZBB"
 330   "orc.b\t%0,%1")
 331
 332 (define_insn "bswap<mode>2"
 333   [(set (match_operand:X 0 "register_operand" "=r")
 334         (bswap:X (match_operand:X 1 "register_operand" "r")))]
 335   "TARGET_ZBB"
 336   "rev8\t%0,%1"
 337   [(set_attr "type" "bitmanip")])
 338
 339 ;; HI bswap can be emulated using SI/DI bswap followed
 340 ;; by a logical shift right
 341 ;; SI bswap for TARGET_64BIT is already similarly in
 342 ;; the common code.
 343 (define_expand "bswaphi2"
 344   [(set (match_operand:HI 0 "register_operand" "=r")
 345         (bswap:HI (match_operand:HI 1 "register_operand" "r")))]
 346   "TARGET_ZBB"
 347 {
 348   rtx tmp = gen_reg_rtx (word_mode);
 349   rtx newop1 = gen_lowpart (word_mode, operands[1]);
 350   if (TARGET_64BIT)
 351     emit_insn (gen_bswapdi2 (tmp, newop1));
 352   else
 353     emit_insn (gen_bswapsi2 (tmp, newop1));
 354   rtx tmp1 = gen_reg_rtx (word_mode);
 355   if (TARGET_64BIT)
 356     emit_insn (gen_lshrdi3 (tmp1, tmp, GEN_INT (64 - 16)));
 357   else
 358     emit_insn (gen_lshrsi3 (tmp1, tmp, GEN_INT (32 - 16)));
 359   emit_move_insn (operands[0], gen_lowpart (HImode, tmp1));
 360   DONE;
 361 })
 362
 363 (define_insn "<bitmanip_optab><mode>3"
 364   [(set (match_operand:X 0 "register_operand" "=r")
 365         (bitmanip_minmax:X (match_operand:X 1 "register_operand" "r")
 366                            (match_operand:X 2 "register_operand" "r")))]
 367   "TARGET_ZBB"
 368   "<bitmanip_insn>\t%0,%1,%2"
 369   [(set_attr "type" "bitmanip")])
 370
 371 ;; ZBS extension.
 372
 373 (define_insn "*bset<mode>"
 374   [(set (match_operand:X 0 "register_operand" "=r")
 375         (ior:X (ashift:X (const_int 1)
 376                          (match_operand:QI 2 "register_operand" "r"))
 377                (match_operand:X 1 "register_operand" "r")))]
 378   "TARGET_ZBS"
 379   "bset\t%0,%1,%2"
 380   [(set_attr "type" "bitmanip")])
 381
 382 (define_insn "*bset<mode>_mask"
 383   [(set (match_operand:X 0 "register_operand" "=r")
 384         (ior:X (ashift:X (const_int 1)
 385                          (subreg:QI
 386                           (and:X (match_operand:X 2 "register_operand" "r")
 387                                  (match_operand 3 "<X:shiftm1>" "<X:shiftm1p>")) 0))
 388                (match_operand:X 1 "register_operand" "r")))]
 389   "TARGET_ZBS"
 390   "bset\t%0,%1,%2"
 391   [(set_attr "type" "bitmanip")])
 392
 393 (define_insn "*bset<mode>_1"
 394   [(set (match_operand:X 0 "register_operand" "=r")
 395         (ashift:X (const_int 1)
 396                   (match_operand:QI 1 "register_operand" "r")))]
 397   "TARGET_ZBS"
 398   "bset\t%0,x0,%1"
 399   [(set_attr "type" "bitmanip")])
 400
 401 (define_insn "*bset<mode>_1_mask"
 402   [(set (match_operand:X 0 "register_operand" "=r")
 403         (ashift:X (const_int 1)
 404                   (subreg:QI
 405                    (and:X (match_operand:X 1 "register_operand" "r")
 406                           (match_operand 2 "<X:shiftm1>" "<X:shiftm1p>")) 0)))]
 407   "TARGET_ZBS"
 408   "bset\t%0,x0,%1"
 409   [(set_attr "type" "bitmanip")])
 410
 411 (define_insn "*bseti<mode>"
 412   [(set (match_operand:X 0 "register_operand" "=r")
 413         (ior:X (match_operand:X 1 "register_operand" "r")
 414                (match_operand:X 2 "single_bit_mask_operand" "DbS")))]
 415   "TARGET_ZBS"
 416   "bseti\t%0,%1,%S2"
 417   [(set_attr "type" "bitmanip")])
 418
 419 ;; As long as the SImode operand is not a partial subreg, we can use a
 420 ;; bseti without postprocessing, as the middle end is smart enough to
 421 ;; stay away from the signbit.
 422 (define_insn "*bsetidisi"
 423   [(set (match_operand:DI 0 "register_operand" "=r")
 424         (ior:DI (sign_extend:DI (match_operand:SI 1 "register_operand" "r"))
 425                 (match_operand 2 "single_bit_mask_operand" "i")))]
 426   "TARGET_ZBS && TARGET_64BIT
 427    && !partial_subreg_p (operands[2])"
 428   "bseti\t%0,%1,%S2"
 429   [(set_attr "type" "bitmanip")])
 430
 431 (define_insn "*bclr<mode>"
 432   [(set (match_operand:X 0 "register_operand" "=r")
 433         (and:X (rotate:X (const_int -2)
 434                          (match_operand:QI 2 "register_operand" "r"))
 435                (match_operand:X 1 "register_operand" "r")))]
 436   "TARGET_ZBS"
 437   "bclr\t%0,%1,%2"
 438   [(set_attr "type" "bitmanip")])
 439
 440 (define_insn "*bclri<mode>"
 441   [(set (match_operand:X 0 "register_operand" "=r")
 442         (and:X (match_operand:X 1 "register_operand" "r")
 443                (match_operand:X 2 "not_single_bit_mask_operand" "DnS")))]
 444   "TARGET_ZBS"
 445   "bclri\t%0,%1,%T2"
 446   [(set_attr "type" "bitmanip")])
 447
 448 ;; In case we have "val & ~IMM" where ~IMM has 2 bits set.
 449 (define_insn_and_split "*bclri<mode>_nottwobits"
 450   [(set (match_operand:X 0 "register_operand" "=r")
 451         (and:X (match_operand:X 1 "register_operand" "r")
 452                (match_operand:X 2 "const_nottwobits_operand" "i")))]
 453   "TARGET_ZBS && !paradoxical_subreg_p (operands[1])"
 454   "#"
 455   "&& reload_completed"
 456   [(set (match_dup 0) (and:X (match_dup 1) (match_dup 3)))
 457    (set (match_dup 0) (and:X (match_dup 0) (match_dup 4)))]
 458 {
 459         unsigned HOST_WIDE_INT bits = ~UINTVAL (operands[2]);
 460         unsigned HOST_WIDE_INT topbit = HOST_WIDE_INT_1U << floor_log2 (bits);
 461
 462         operands[3] = GEN_INT (~bits | topbit);
 463         operands[4] = GEN_INT (~topbit);
 464 })
 465
 466 ;; In case of a paradoxical subreg, the sign bit and the high bits are
 467 ;; not allowed to be changed
 468 (define_insn_and_split "*bclridisi_nottwobits"
 469   [(set (match_operand:DI 0 "register_operand" "=r")
 470         (and:DI (match_operand:DI 1 "register_operand" "r")
 471                 (match_operand:DI 2 "const_nottwobits_operand" "i")))]
 472   "TARGET_64BIT && TARGET_ZBS
 473    && clz_hwi (~UINTVAL (operands[2])) > 33"
 474   "#"
 475   "&& reload_completed"
 476   [(set (match_dup 0) (and:DI (match_dup 1) (match_dup 3)))
 477    (set (match_dup 0) (and:DI (match_dup 0) (match_dup 4)))]
 478 {
 479         unsigned HOST_WIDE_INT bits = ~UINTVAL (operands[2]);
 480         unsigned HOST_WIDE_INT topbit = HOST_WIDE_INT_1U << floor_log2 (bits);
 481
 482         operands[3] = GEN_INT (~bits | topbit);
 483         operands[4] = GEN_INT (~topbit);
 484 })
 485
 486 (define_insn "*binv<mode>"
 487   [(set (match_operand:X 0 "register_operand" "=r")
 488         (xor:X (ashift:X (const_int 1)
 489                          (match_operand:QI 2 "register_operand" "r"))
 490                (match_operand:X 1 "register_operand" "r")))]
 491   "TARGET_ZBS"
 492   "binv\t%0,%1,%2"
 493   [(set_attr "type" "bitmanip")])
 494
 495 (define_insn "*binvi<mode>"
 496   [(set (match_operand:X 0 "register_operand" "=r")
 497         (xor:X (match_operand:X 1 "register_operand" "r")
 498                (match_operand:X 2 "single_bit_mask_operand" "DbS")))]
 499   "TARGET_ZBS"
 500   "binvi\t%0,%1,%S2"
 501   [(set_attr "type" "bitmanip")])
 502
 503 (define_insn "*bext<mode>"
 504   [(set (match_operand:X 0 "register_operand" "=r")
 505         (zero_extract:X (match_operand:X 1 "register_operand" "r")
 506                         (const_int 1)
 507                         (zero_extend:X
 508                          (match_operand:QI 2 "register_operand" "r"))))]
 509   "TARGET_ZBS"
 510   "bext\t%0,%1,%2"
 511   [(set_attr "type" "bitmanip")])
 512
 513 ;; When performing `(a & (1UL << bitno)) ? 0 : -1` the combiner
 514 ;; usually has the `bitno` typed as X-mode (i.e. no further
 515 ;; zero-extension is performed around the bitno).
 516 (define_insn "*bext<mode>"
 517   [(set (match_operand:X 0 "register_operand" "=r")
 518         (zero_extract:X (match_operand:X 1 "register_operand" "r")
 519                         (const_int 1)
 520                         (match_operand:X 2 "register_operand" "r")))]
 521   "TARGET_ZBS"
 522   "bext\t%0,%1,%2"
 523   [(set_attr "type" "bitmanip")])
 524
 525 (define_insn "*bexti"
 526   [(set (match_operand:X 0 "register_operand" "=r")
 527         (zero_extract:X (match_operand:X 1 "register_operand" "r")
 528                         (const_int 1)
 529                         (match_operand 2 "immediate_operand" "n")))]
 530   "TARGET_ZBS && UINTVAL (operands[2]) < GET_MODE_BITSIZE (<MODE>mode)"
 531   "bexti\t%0,%1,%2"
 532   [(set_attr "type" "bitmanip")])
 533
 534 ;; Split for "(a & (1 << BIT_NO)) ? 0 : 1":
 535 ;; We avoid reassociating "(~(a >> BIT_NO)) & 1" into "((~a) >> BIT_NO) & 1",
 536 ;; so we don't have to use a temporary.  Instead we extract the bit and then
 537 ;; invert bit 0 ("a ^ 1") only.
 538 (define_split
 539   [(set (match_operand:X 0 "register_operand")
 540         (and:X (not:X (lshiftrt:X (match_operand:X 1 "register_operand")
 541                                   (subreg:QI (match_operand:X 2 "register_operand") 0)))
 542                (const_int 1)))]
 543   "TARGET_ZBS"
 544   [(set (match_dup 0) (zero_extract:X (match_dup 1)
 545                                       (const_int 1)
 546                                       (match_dup 2)))
 547    (set (match_dup 0) (xor:X (match_dup 0) (const_int 1)))])
 548
 549 ;; We can create a polarity-reversed mask (i.e. bit N -> { set = 0, clear = -1 })
 550 ;; using a bext(i) followed by an addi instruction.
 551 ;; This splits the canonical representation of "(a & (1 << BIT_NO)) ? 0 : -1".
 552 (define_split
 553   [(set (match_operand:GPR 0 "register_operand")
 554        (neg:GPR (eq:GPR (zero_extract:GPR (match_operand:GPR 1 "register_operand")
 555                                           (const_int 1)
 556                                           (match_operand 2))
 557                         (const_int 0))))]
 558   "TARGET_ZBS"
 559   [(set (match_dup 0) (zero_extract:GPR (match_dup 1) (const_int 1) (match_dup 2)))
 560    (set (match_dup 0) (plus:GPR (match_dup 0) (const_int -1)))])
 561
 562 ;; Catch those cases where we can use a bseti/binvi + ori/xori or
 563 ;; bseti/binvi + bseti/binvi instead of a lui + addi + or/xor sequence.
 564 (define_insn_and_split "*<or_optab>i<mode>_extrabit"
 565   [(set (match_operand:X 0 "register_operand" "=r")
 566         (any_or:X (match_operand:X 1 "register_operand" "r")
 567                   (match_operand:X 2 "uimm_extra_bit_or_twobits" "i")))]
 568   "TARGET_ZBS"
 569   "#"
 570   "&& reload_completed"
 571   [(set (match_dup 0) (<or_optab>:X (match_dup 1) (match_dup 3)))
 572    (set (match_dup 0) (<or_optab>:X (match_dup 0) (match_dup 4)))]
 573 {
 574         unsigned HOST_WIDE_INT bits = UINTVAL (operands[2]);
 575         unsigned HOST_WIDE_INT topbit = HOST_WIDE_INT_1U << floor_log2 (bits);
 576
 577         operands[3] = GEN_INT (bits &~ topbit);
 578         operands[4] = GEN_INT (topbit);
 579 })
 580
 581 ;; Same to use blcri + andi and blcri + bclri
 582 (define_insn_and_split "*andi<mode>_extrabit"
 583   [(set (match_operand:X 0 "register_operand" "=r")
 584         (and:X (match_operand:X 1 "register_operand" "r")
 585                (match_operand:X 2 "not_uimm_extra_bit_or_nottwobits" "i")))]
 586   "TARGET_ZBS"
 587   "#"
 588   "&& reload_completed"
 589   [(set (match_dup 0) (and:X (match_dup 1) (match_dup 3)))
 590    (set (match_dup 0) (and:X (match_dup 0) (match_dup 4)))]
 591 {
 592         unsigned HOST_WIDE_INT bits = UINTVAL (operands[2]);
 593         unsigned HOST_WIDE_INT topbit = HOST_WIDE_INT_1U << floor_log2 (~bits);
 594
 595         operands[3] = GEN_INT (bits | topbit);
 596         operands[4] = GEN_INT (~topbit);
 597 })
 598
 599 ;; IF_THEN_ELSE: test for 2 bits of opposite polarity
 600 (define_insn_and_split "*branch<X:mode>_mask_twobits_equals_singlebit"
 601   [(set (pc)
 602         (if_then_else
 603           (match_operator 1 "equality_operator"
 604             [(and:X (match_operand:X 2 "register_operand" "r")
 605                     (match_operand:X 3 "const_twobits_not_arith_operand" "i"))
 606              (match_operand:X 4 "single_bit_mask_operand" "i")])
 607          (label_ref (match_operand 0 "" ""))
 608          (pc)))
 609    (clobber (match_scratch:X 5 "=&r"))
 610    (clobber (match_scratch:X 6 "=&r"))]
 611   "TARGET_ZBS && TARGET_ZBB"
 612   "#"
 613   "&& reload_completed"
 614   [(set (match_dup 5) (zero_extract:X (match_dup 2)
 615                                       (const_int 1)
 616                                       (match_dup 8)))
 617    (set (match_dup 6) (zero_extract:X (match_dup 2)
 618                                       (const_int 1)
 619                                       (match_dup 9)))
 620    (set (match_dup 6) (and:X (not:X (match_dup 6)) (match_dup 5)))
 621    (set (pc) (if_then_else (match_op_dup 1 [(match_dup 6) (const_int 0)])
 622                            (label_ref (match_dup 0))
 623                            (pc)))]
 624 {
 625    unsigned HOST_WIDE_INT twobits_mask = UINTVAL (operands[3]);
 626    unsigned HOST_WIDE_INT singlebit_mask = UINTVAL (operands[4]);
 627
 628    /* We should never see an unsatisfiable condition.  */
 629    gcc_assert (twobits_mask & singlebit_mask);
 630
 631    int setbit = ctz_hwi (singlebit_mask);
 632    int clearbit = ctz_hwi (twobits_mask & ~singlebit_mask);
 633
 634    operands[1] = gen_rtx_fmt_ee (GET_CODE (operands[1]) == NE ? EQ : NE,
 635                                  <X:MODE>mode, operands[6], GEN_INT(0));
 636
 637    operands[8] = GEN_INT (setbit);
 638    operands[9] = GEN_INT (clearbit);
 639 })