src/compiler/ppc/arith.lisp

   1 ;;;; the VM definition arithmetic VOPs for the PPC
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; This software is derived from the CMU CL system, which was
   7 ;;;; written at Carnegie Mellon University and released into the
   8 ;;;; public domain. The software is in the public domain and is
   9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  10 ;;;; files for more information.
  11
  12 (in-package "SB!VM")
  13 \f
  14 ;;;; Unary operations.
  15
  16 (define-vop (fast-safe-arith-op)
  17   (:policy :fast-safe)
  18   (:effects)
  19   (:affected))
  20
  21 (define-vop (fixnum-unop fast-safe-arith-op)
  22   (:args (x :scs (any-reg)))
  23   (:results (res :scs (any-reg)))
  24   (:note "inline fixnum arithmetic")
  25   (:arg-types tagged-num)
  26   (:result-types tagged-num))
  27
  28 (define-vop (signed-unop fast-safe-arith-op)
  29   (:args (x :scs (signed-reg)))
  30   (:results (res :scs (signed-reg)))
  31   (:note "inline (signed-byte 32) arithmetic")
  32   (:arg-types signed-num)
  33   (:result-types signed-num))
  34
  35 (define-vop (fast-negate/fixnum fixnum-unop)
  36   (:translate %negate)
  37   (:generator 1
  38     (inst neg res x)))
  39
  40 (define-vop (fast-negate/signed signed-unop)
  41   (:translate %negate)
  42   (:generator 2
  43     (inst neg res x)))
  44
  45 (define-vop (fast-lognot/fixnum fixnum-unop)
  46   (:translate lognot)
  47   (:generator 1
  48     (inst subfic res x (fixnumize -1))))
  49
  50 (define-vop (fast-lognot/signed signed-unop)
  51   (:translate lognot)
  52   (:generator 2
  53     (inst not res x)))
  54 \f
  55 ;;;; Binary fixnum operations.
  56
  57 ;;; Assume that any constant operand is the second arg...
  58
  59 (define-vop (fast-fixnum-binop fast-safe-arith-op)
  60   (:args (x :target r :scs (any-reg zero))
  61          (y :target r :scs (any-reg zero)))
  62   (:arg-types tagged-num tagged-num)
  63   (:results (r :scs (any-reg)))
  64   (:result-types tagged-num)
  65   (:note "inline fixnum arithmetic"))
  66
  67 (define-vop (fast-unsigned-binop fast-safe-arith-op)
  68   (:args (x :target r :scs (unsigned-reg zero))
  69          (y :target r :scs (unsigned-reg zero)))
  70   (:arg-types unsigned-num unsigned-num)
  71   (:results (r :scs (unsigned-reg)))
  72   (:result-types unsigned-num)
  73   (:note "inline (unsigned-byte 32) arithmetic"))
  74
  75 (define-vop (fast-signed-binop fast-safe-arith-op)
  76   (:args (x :target r :scs (signed-reg zero))
  77          (y :target r :scs (signed-reg zero)))
  78   (:arg-types signed-num signed-num)
  79   (:results (r :scs (signed-reg)))
  80   (:result-types signed-num)
  81   (:note "inline (signed-byte 32) arithmetic"))
  82
  83 (define-vop (fast-fixnum-binop-c fast-safe-arith-op)
  84   (:args (x :target r :scs (any-reg zero)))
  85   (:info y)
  86   (:arg-types tagged-num
  87               (:constant (and (signed-byte 14) (not (integer 0 0)))))
  88   (:results (r :scs (any-reg)))
  89   (:result-types tagged-num)
  90   (:note "inline fixnum arithmetic"))
  91
  92 (define-vop (fast-fixnum-binop30-c fast-safe-arith-op)
  93   (:args (x :target r :scs (any-reg zero)))
  94   (:info y)
  95   (:arg-types tagged-num
  96               (:constant (and (signed-byte 30) (not (integer 0 0)))))
  97   (:results (r :scs (any-reg)))
  98   (:result-types tagged-num)
  99   (:note "inline fixnum arithmetic"))
 100
 101 (define-vop (fast-fixnum-logop-c fast-safe-arith-op)
 102   (:args (x :target r :scs (any-reg zero)))
 103   (:info y)
 104   (:arg-types tagged-num
 105               (:constant (and (unsigned-byte 14) (not (integer 0 0)))))
 106   (:results (r :scs (any-reg)))
 107   (:result-types tagged-num)
 108   (:note "inline fixnum logical op"))
 109
 110 (define-vop (fast-fixnum-logop30-c fast-safe-arith-op)
 111   (:args (x :target r :scs (any-reg zero)))
 112   (:info y)
 113   (:arg-types tagged-num
 114               (:constant (and (unsigned-byte 16) (not (integer 0 0)))))
 115   (:results (r :scs (any-reg)))
 116   (:result-types tagged-num)
 117   (:note "inline fixnum logical op"))
 118
 119 (define-vop (fast-unsigned-binop-c fast-safe-arith-op)
 120   (:args (x :target r :scs (unsigned-reg zero)))
 121   (:info y)
 122   (:arg-types unsigned-num
 123               (:constant (and (signed-byte 16) (not (integer 0 0)))))
 124   (:results (r :scs (unsigned-reg)))
 125   (:result-types unsigned-num)
 126   (:note "inline (unsigned-byte 32) arithmetic"))
 127
 128 (define-vop (fast-unsigned-binop32-c fast-safe-arith-op)
 129   (:args (x :target r :scs (unsigned-reg zero)))
 130   (:info y)
 131   (:arg-types unsigned-num
 132               (:constant (and (unsigned-byte 32) (not (integer 0 0)))))
 133   (:results (r :scs (unsigned-reg)))
 134   (:result-types unsigned-num)
 135   (:note "inline (unsigned-byte 32) arithmetic"))
 136
 137 (define-vop (fast-signed-binop32-c fast-safe-arith-op)
 138   (:args (x :target r :scs (signed-reg zero)))
 139   (:info y)
 140   (:arg-types signed-num
 141               (:constant (and (signed-byte 32) (not (integer 0 0)))))
 142   (:results (r :scs (signed-reg)))
 143   (:result-types signed-num)
 144   (:note "inline (signed-byte 32) arithmetic"))
 145
 146 (define-vop (fast-unsigned-logop-c fast-safe-arith-op)
 147   (:args (x :target r :scs (unsigned-reg zero)))
 148   (:info y)
 149   (:arg-types unsigned-num
 150               (:constant (and (unsigned-byte 16) (not (integer 0 0)))))
 151   (:results (r :scs (unsigned-reg)))
 152   (:result-types unsigned-num)
 153   (:note "inline (unsigned-byte 32) logical op"))
 154
 155 (define-vop (fast-unsigned-logop32-c fast-safe-arith-op)
 156   (:args (x :target r :scs (unsigned-reg zero)))
 157   (:info y)
 158   (:arg-types unsigned-num
 159               (:constant (and (unsigned-byte 32) (not (integer 0 0)))))
 160   (:results (r :scs (unsigned-reg)))
 161   (:result-types unsigned-num)
 162   (:note "inline (unsigned-byte 32) logical op"))
 163
 164 (define-vop (fast-signed-logop32-c fast-safe-arith-op)
 165   (:args (x :target r :scs (signed-reg zero)))
 166   (:info y)
 167   (:arg-types signed-num
 168               (:constant (and (unsigned-byte 32) (not (integer 0 0)))))
 169   (:results (r :scs (signed-reg)))
 170   (:result-types signed-num)
 171   (:note "inline (signed-byte 32) logical op"))
 172
 173 (define-vop (fast-signed-binop-c fast-safe-arith-op)
 174   (:args (x :target r :scs (signed-reg zero)))
 175   (:info y)
 176   (:arg-types signed-num
 177               (:constant (and (signed-byte 16) (not (integer 0 0)))))
 178   (:results (r :scs (signed-reg)))
 179   (:result-types signed-num)
 180   (:note "inline (signed-byte 32) arithmetic"))
 181
 182 (define-vop (fast-signed-logop-c fast-safe-arith-op)
 183   (:args (x :target r :scs (signed-reg zero)))
 184   (:info y)
 185   (:arg-types signed-num
 186               (:constant (and (unsigned-byte 16) (not (integer 0 0)))))
 187   (:results (r :scs (signed-reg)))
 188   (:result-types signed-num)
 189   (:note "inline (signed-byte 32) logical op"))
 190
 191 (eval-when (:compile-toplevel :load-toplevel :execute)
 192
 193 (defmacro !define-var-binop (translate untagged-penalty op
 194                              &optional arg-swap restore-fixnum-mask)
 195   `(progn
 196      (define-vop (,(symbolicate "FAST-" translate "/FIXNUM=>FIXNUM")
 197                   fast-fixnum-binop)
 198        ,@(when restore-fixnum-mask
 199            `((:temporary (:sc non-descriptor-reg) temp)))
 200        (:translate ,translate)
 201        (:generator 2
 202          ,(if arg-swap
 203              `(inst ,op ,(if restore-fixnum-mask 'temp 'r) y x)
 204              `(inst ,op ,(if restore-fixnum-mask 'temp 'r) x y))
 205          ;; FIXME: remind me what convention we used for 64bitizing
 206          ;; stuff?  -- CSR, 2003-08-27
 207          ,@(when restore-fixnum-mask
 208              `((inst clrrwi r temp (1- n-lowtag-bits))))))
 209      (define-vop (,(symbolicate "FAST-" translate "/SIGNED=>SIGNED")
 210                   fast-signed-binop)
 211        (:translate ,translate)
 212        (:generator ,(1+ untagged-penalty)
 213          ,(if arg-swap
 214              `(inst ,op r y x)
 215              `(inst ,op r x y))))
 216      (define-vop (,(symbolicate "FAST-" translate "/UNSIGNED=>UNSIGNED")
 217                   fast-unsigned-binop)
 218        (:translate ,translate)
 219        (:generator ,(1+ untagged-penalty)
 220          ,(if arg-swap
 221              `(inst ,op r y x)
 222              `(inst ,op r x y))))))
 223
 224 ;;; FIXME: the code has really only been checked for adds; we could do
 225 ;;; subtracts, too, but my brain is not up to the task of figuring out
 226 ;;; signs and borrows.
 227 (defmacro !define-const-binop (translate untagged-penalty op &optional (shifted-op nil))
 228   `(progn
 229      (define-vop (,(symbolicate 'fast- translate '-c/fixnum=>fixnum)
 230                   ,(if shifted-op
 231                        'fast-fixnum-binop30-c
 232                        'fast-fixnum-binop-c))
 233        (:translate ,translate)
 234        ,@(when shifted-op
 235           `((:temporary (:sc any-reg :target r) temp)))
 236        (:generator 1
 237         ,(if shifted-op
 238              `(let* ((y (fixnumize y))
 239                      (high-half (ldb (byte 16 16) y))
 240                      (low-half (ldb (byte 16 0) y)))
 241                ;; Compare %LR in insts.lisp.
 242                (cond
 243                  ((and (logbitp 15 low-half) (= high-half #xffff))
 244                   ;; Let sign-extension do the work for us, but make sure
 245                   ;; to turn LOW-HALF into a signed integer.
 246                   (inst ,op r x (dpb low-half (byte 16 0) -1)))
 247                  ((and (not (logbitp 15 low-half)) (zerop high-half))
 248                   (inst ,op r x low-half))
 249                  ((zerop low-half)
 250                   (inst ,shifted-op r x (if (logbitp 15 high-half)
 251                                             (dpb high-half (byte 16 0) -1)
 252                                             high-half)))
 253                  (t
 254                   ;; Check to see whether compensating for the sign bit
 255                   ;; of LOW-HALF is necessary.
 256                   (let ((high-half (let ((top (if (logbitp 15 low-half)
 257                                                   (ldb (byte 16 0)
 258                                                        (1+ high-half))
 259                                                   high-half)))
 260                                      (if (logbitp 15 top)
 261                                          (dpb top (byte 16 0) -1)
 262                                          top))))
 263                     (inst ,shifted-op temp x high-half)
 264                     (inst ,op r temp low-half)))))
 265              `(inst ,op r x (fixnumize y)))))
 266      (define-vop (,(symbolicate 'fast- translate '-c/signed=>signed)
 267                   ,(if shifted-op
 268                        'fast-signed-binop32-c
 269                        'fast-signed-binop-c))
 270        (:translate ,translate)
 271        ,@(when shifted-op
 272           `((:temporary (:sc non-descriptor-reg :target r) temp)))
 273        (:generator ,untagged-penalty
 274         ,(if shifted-op
 275              `(let ((high-half (ldb (byte 16 16) y))
 276                     (low-half (ldb (byte 16 0) y)))
 277                ;; Compare %LR in insts.lisp.
 278                (cond
 279                  ((and (logbitp 15 low-half) (= high-half #xffff))
 280                   ;; Let sign-extension do the work for us, but make sure
 281                   ;; to turn LOW-HALF into a signed integer.
 282                   (inst ,op r x (dpb low-half (byte 16 0) -1)))
 283                  ((and (not (logbitp 15 low-half)) (zerop high-half))
 284                   (inst ,op r x low-half))
 285                  ((zerop low-half)
 286                   (inst ,shifted-op r x (if (logbitp 15 high-half)
 287                                             (dpb high-half (byte 16 0) -1)
 288                                             high-half)))
 289                  (t
 290                   ;; Check to see whether compensating for the sign bit
 291                   ;; of LOW-HALF is necessary.
 292                   (let ((high-half (let ((top (if (logbitp 15 low-half)
 293                                                   (ldb (byte 16 0)
 294                                                        (1+ high-half))
 295                                                   high-half)))
 296                                      (if (logbitp 15 top)
 297                                          (dpb top (byte 16 0) -1)
 298                                          top))))
 299                     (inst ,shifted-op temp x high-half)
 300                     (inst ,op r temp low-half)))))
 301              `(inst ,op r x y))))
 302      (define-vop (,(symbolicate 'fast- translate '-c/unsigned=>unsigned)
 303                   ,(if shifted-op
 304                        'fast-unsigned-binop32-c
 305                        'fast-unsigned-binop-c))
 306        (:translate ,translate)
 307        ,@(when shifted-op
 308           `((:temporary (:sc non-descriptor-reg :target r) temp)))
 309        (:generator ,untagged-penalty
 310         ,(if shifted-op
 311              `(let ((high-half (ldb (byte 16 16) y))
 312                     (low-half (ldb (byte 16 0) y)))
 313                ;; Compare %LR in insts.lisp.
 314                (cond
 315                  ((and (logbitp 15 low-half) (= high-half #xffff))
 316                   ;; Let sign-extension do the work for us, but make sure
 317                   ;; to turn LOW-HALF into a signed integer.
 318                   (inst ,op r x (dpb low-half (byte 16 0) -1)))
 319                  ((and (not (logbitp 15 low-half)) (zerop high-half))
 320                   (inst ,op r x low-half))
 321                  ((zerop low-half)
 322                   (inst ,shifted-op r x (if (logbitp 15 high-half)
 323                                             (dpb high-half (byte 16 0) -1)
 324                                             high-half)))
 325                  (t
 326                   ;; Check to see whether compensating for the sign bit
 327                   ;; of LOW-HALF is necessary.
 328                   (let ((high-half (let ((top (if (logbitp 15 low-half)
 329                                                   (ldb (byte 16 0)
 330                                                        (1+ high-half))
 331                                                   high-half)))
 332                                      (if (logbitp 15 top)
 333                                          (dpb top (byte 16 0) -1)
 334                                          top))))
 335                     (inst ,shifted-op temp x high-half)
 336                     (inst ,op r temp low-half)))))
 337              `(inst ,op r x y))))))
 338
 339 ;;; For logical operations, we don't have to worry about signed bit
 340 ;;; propagation from the lower half of a 32-bit operand.
 341 (defmacro !define-const-logop (translate untagged-penalty op &optional (shifted-op nil))
 342   `(progn
 343      (define-vop (,(symbolicate 'fast- translate '-c/fixnum=>fixnum)
 344                   ,(if shifted-op
 345                        'fast-fixnum-logop30-c
 346                        'fast-fixnum-logop-c))
 347        (:translate ,translate)
 348        ,@(when shifted-op
 349           `((:temporary (:sc any-reg :target r) temp)))
 350        (:generator 1
 351         ,(if shifted-op
 352              `(let* ((y (fixnumize y))
 353                      (high-half (ldb (byte 16 16) y))
 354                      (low-half (ldb (byte 16 0) y)))
 355                (cond
 356                  ((zerop high-half) (inst ,op r x low-half))
 357                  ((zerop low-half) (inst ,shifted-op r x high-half))
 358                  (t
 359                   (inst ,shifted-op temp x high-half)
 360                   (inst ,op r temp low-half))))
 361              `(inst ,op r x (fixnumize y)))))
 362      (define-vop (,(symbolicate 'fast- translate '-c/signed=>signed)
 363                   ,(if shifted-op
 364                        'fast-signed-logop32-c
 365                        'fast-signed-logop-c))
 366        (:translate ,translate)
 367        ,@(when shifted-op
 368           `((:temporary (:sc non-descriptor-reg :target r) temp)))
 369        (:generator ,untagged-penalty
 370         ,(if shifted-op
 371              `(let ((high-half (ldb (byte 16 16) y))
 372                     (low-half (ldb (byte 16 0) y)))
 373                (cond
 374                  ((zerop high-half) (inst ,op r x low-half))
 375                  ((zerop low-half) (inst ,shifted-op r x high-half))
 376                  (t
 377                   (inst ,shifted-op temp x high-half)
 378                   (inst ,op r temp low-half))))
 379              `(inst ,op r x y))))
 380      (define-vop (,(symbolicate 'fast- translate '-c/unsigned=>unsigned)
 381                   ,(if shifted-op
 382                        'fast-unsigned-logop32-c
 383                        'fast-unsigned-logop-c))
 384        (:translate ,translate)
 385        ,@(when shifted-op
 386           `((:temporary (:sc non-descriptor-reg :target r) temp)))
 387        (:generator ,untagged-penalty
 388         ,(if shifted-op
 389              `(let ((high-half (ldb (byte 16 16) y))
 390                     (low-half (ldb (byte 16 0) y)))
 391                (cond
 392                  ((zerop high-half) (inst ,op r x low-half))
 393                  ((zerop low-half) (inst ,shifted-op r x high-half))
 394                  (t
 395                   (inst ,shifted-op temp x high-half)
 396                   (inst ,op r temp low-half))))
 397              `(inst ,op r x y))))))
 398
 399 ); eval-when
 400
 401 (!define-var-binop + 4 add)
 402 (!define-var-binop - 4 sub)
 403 (!define-var-binop logand 2 and)
 404 (!define-var-binop logandc1 2 andc t)
 405 (!define-var-binop logandc2 2 andc)
 406 (!define-var-binop logior 2 or)
 407 (!define-var-binop logorc1 2 orc t t)
 408 (!define-var-binop logorc2 2 orc nil t)
 409 (!define-var-binop logxor 2 xor)
 410 (!define-var-binop logeqv 2 eqv nil t)
 411 (!define-var-binop lognand 2 nand nil t)
 412 (!define-var-binop lognor 2 nor nil t)
 413
 414 (!define-const-binop + 4 addi addis)
 415 (!define-const-binop - 4 subi)
 416 ;;; Implementing a 32-bit immediate version of LOGAND wouldn't be any
 417 ;;; better than loading the 32-bit constant via LR and then performing
 418 ;;; an /AND/.  So don't bother.  (It would be better in some cases, such
 419 ;;; as when one half of the word is zeros--we save a register--but we
 420 ;;; would have specified one temporary register in the VOP, so we lose
 421 ;;; any possible advantage.)
 422 (!define-const-logop logand 2 andi.)
 423 (!define-const-logop logior 2 ori oris)
 424 (!define-const-logop logxor 2 xori xoris)
 425
 426 (define-vop (fast-*/fixnum=>fixnum fast-fixnum-binop)
 427   (:temporary (:scs (non-descriptor-reg)) temp)
 428   (:translate *)
 429   (:generator 2
 430     (inst srawi temp y n-fixnum-tag-bits)
 431     (inst mullw r x temp)))
 432
 433 (define-vop (fast-*-c/fixnum=>fixnum fast-fixnum-binop-c)
 434   (:translate *)
 435   (:arg-types tagged-num
 436               (:constant (and (signed-byte 16) (not (integer 0 0)))))
 437   (:generator 1
 438     (inst mulli r x y)))
 439
 440 (define-vop (fast-*-bigc/fixnum=>fixnum fast-fixnum-binop-c)
 441   (:translate *)
 442   (:arg-types tagged-num
 443               (:constant (and fixnum (not (signed-byte 16)))))
 444   (:temporary (:scs (non-descriptor-reg)) temp)
 445   (:generator 1
 446     (inst lr temp y)
 447     (inst mullw r x temp)))
 448
 449 (define-vop (fast-*/signed=>signed fast-signed-binop)
 450   (:translate *)
 451   (:generator 4
 452     (inst mullw r x y)))
 453
 454 (define-vop (fast-*-c/signed=>signed fast-signed-binop-c)
 455   (:translate *)
 456   (:generator 3
 457     (inst mulli r x y)))
 458
 459 (define-vop (fast-*/unsigned=>unsigned fast-unsigned-binop)
 460   (:translate *)
 461   (:generator 4
 462     (inst mullw r x y)))
 463
 464 (define-vop (fast-*-c/unsigned=>unsigned fast-unsigned-binop-c)
 465   (:translate *)
 466   (:generator 3
 467     (inst mulli r x y)))
 468 \f
 469 ;;; Shifting
 470
 471 (macrolet ((def (name sc-type type result-type cost)
 472              `(define-vop (,name)
 473                 (:note "inline ASH")
 474                 (:translate ash)
 475                 (:args (number :scs (,sc-type))
 476                        (amount :scs (signed-reg unsigned-reg immediate)))
 477                 (:arg-types ,type positive-fixnum)
 478                 (:results (result :scs (,result-type)))
 479                 (:result-types ,type)
 480                 (:policy :fast-safe)
 481                 (:generator ,cost
 482                    (sc-case amount
 483                      ((signed-reg unsigned-reg)
 484                       (inst slw result number amount))
 485                      (immediate
 486                       (let ((amount (tn-value amount)))
 487                         (aver (> amount 0))
 488                         (inst slwi result number amount))))))))
 489   ;; FIXME: There's the opportunity for a sneaky optimization here, I
 490   ;; think: a FAST-ASH-LEFT-C/FIXNUM=>SIGNED vop.  -- CSR, 2003-09-03
 491   (def fast-ash-left/fixnum=>fixnum any-reg tagged-num any-reg 2)
 492   (def fast-ash-left/signed=>signed signed-reg signed-num signed-reg 3)
 493   (def fast-ash-left/unsigned=>unsigned unsigned-reg unsigned-num unsigned-reg 3))
 494
 495 (define-vop (fast-ash/unsigned=>unsigned)
 496   (:note "inline ASH")
 497   (:args (number :scs (unsigned-reg) :to :save)
 498          (amount :scs (signed-reg)))
 499   (:arg-types (:or unsigned-num) signed-num)
 500   (:results (result :scs (unsigned-reg)))
 501   (:result-types unsigned-num)
 502   (:translate ash)
 503   (:policy :fast-safe)
 504   (:temporary (:sc non-descriptor-reg) ndesc)
 505   (:generator 5
 506     (let ((positive (gen-label))
 507           (done (gen-label)))
 508       (inst cmpwi amount 0)
 509       (inst neg ndesc amount)
 510       (inst bge positive)
 511       (inst cmpwi ndesc 31)
 512       (inst srw result number ndesc)
 513       (inst ble done)
 514       (move result zero-tn)
 515       (inst b done)
 516
 517       (emit-label positive)
 518       ;; The result-type assures us that this shift will not overflow.
 519       (inst slw result number amount)
 520
 521       (emit-label done))))
 522
 523 (define-vop (fast-ash-c/unsigned=>unsigned)
 524   (:note "inline constant ASH")
 525   (:args (number :scs (unsigned-reg)))
 526   (:info amount)
 527   (:arg-types unsigned-num (:constant integer))
 528   (:results (result :scs (unsigned-reg)))
 529   (:result-types unsigned-num)
 530   (:translate ash)
 531   (:policy :fast-safe)
 532   (:generator 4
 533     (cond
 534       ((and (minusp amount) (< amount -31)) (move result zero-tn))
 535       ((minusp amount) (inst srwi result number (- amount)))
 536       ;; possible because this is used in the modular version too
 537       ((> amount 31) (move result zero-tn))
 538       (t (inst slwi result number amount)))))
 539
 540 (define-vop (fast-ash/signed=>signed)
 541   (:note "inline ASH")
 542   (:args (number :scs (signed-reg) :to :save)
 543          (amount :scs (signed-reg immediate)))
 544   (:arg-types (:or signed-num) signed-num)
 545   (:results (result :scs (signed-reg)))
 546   (:result-types (:or signed-num))
 547   (:translate ash)
 548   (:policy :fast-safe)
 549   (:temporary (:sc non-descriptor-reg) ndesc)
 550   (:generator 3
 551     (sc-case amount
 552       (signed-reg
 553        (let ((positive (gen-label))
 554              (done (gen-label)))
 555          (inst cmpwi amount 0)
 556          (inst neg ndesc amount)
 557          (inst bge positive)
 558          (inst cmpwi ndesc 31)
 559          (inst sraw result number ndesc)
 560          (inst ble done)
 561          (inst srawi result number 31)
 562          (inst b done)
 563
 564          (emit-label positive)
 565          ;; The result-type assures us that this shift will not overflow.
 566          (inst slw result number amount)
 567
 568          (emit-label done)))
 569
 570       (immediate
 571        (let ((amount (tn-value amount)))
 572          (if (minusp amount)
 573              (let ((amount (min 31 (- amount))))
 574                (inst srawi result number amount))
 575              (inst slwi result number amount)))))))
 576
 577 (define-vop (signed-byte-32-len)
 578   (:translate integer-length)
 579   (:note "inline (signed-byte 32) integer-length")
 580   (:policy :fast-safe)
 581   (:args (arg :scs (signed-reg)))
 582   (:arg-types signed-num)
 583   (:results (res :scs (unsigned-reg) :from :load))
 584   (:result-types unsigned-num)
 585   (:generator 6
 586     ; (integer-length arg) = (- 32 (cntlz (if (>= arg 0) arg (lognot arg))))
 587     (let ((nonneg (gen-label)))
 588       (inst cntlzw. res arg)
 589       (inst bne nonneg)
 590       (inst not res arg)
 591       (inst cntlzw res res)
 592       (emit-label nonneg)
 593       (inst subfic res res 32))))
 594
 595 (define-vop (unsigned-byte-32-len)
 596   (:translate integer-length)
 597   (:note "inline (unsigned-byte 32) integer-length")
 598   (:policy :fast-safe)
 599   (:args (arg :scs (unsigned-reg)))
 600   (:arg-types unsigned-num)
 601   (:results (res :scs (unsigned-reg)))
 602   (:result-types unsigned-num)
 603   (:generator 4
 604     (inst cntlzw res arg)
 605     (inst subfic res res 32)))
 606
 607 (define-vop (unsigned-byte-32-count)
 608   (:translate logcount)
 609   (:note "inline (unsigned-byte 32) logcount")
 610   (:policy :fast-safe)
 611   (:args (arg :scs (unsigned-reg) :target shift))
 612   (:arg-types unsigned-num)
 613   (:results (res :scs (any-reg)))
 614   (:result-types positive-fixnum)
 615   (:temporary (:scs (non-descriptor-reg) :from (:argument 0)) shift temp)
 616   (:generator 30
 617     (let ((loop (gen-label))
 618           (done (gen-label)))
 619       (inst add. shift zero-tn arg)
 620       (move res zero-tn)
 621       (inst beq done)
 622
 623       (emit-label loop)
 624       (inst subi temp shift 1)
 625       (inst and. shift shift temp)
 626       (inst addi res res (fixnumize 1))
 627       (inst bne loop)
 628
 629       (emit-label done))))
 630
 631 \f
 632 ;;;; %LDB
 633
 634 (defknown %%ldb (integer unsigned-byte unsigned-byte) unsigned-byte
 635   (movable foldable flushable always-translatable))
 636
 637 ;;; only for constant folding within the compiler
 638 (defun %%ldb (integer size posn)
 639   (%ldb size posn integer))
 640
 641 (define-vop (ldb-c/fixnum)
 642   (:translate %%ldb)
 643   (:args (x :scs (any-reg)))
 644   (:arg-types tagged-num (:constant (integer 1 29)) (:constant (integer 0 29)))
 645   (:info size posn)
 646   (:results (res :scs (any-reg)))
 647   (:result-types tagged-num)
 648   (:policy :fast-safe)
 649   (:generator 2
 650     (let ((phantom-bits (- (+ size posn) 30)))
 651       (cond
 652         ((plusp phantom-bits)
 653          ;; The byte to be loaded into RES includes sign bits which are not
 654          ;; present in the input X physically.  RLWINM as used below would
 655          ;; mask these out with 0 even for negative inputs.
 656          (inst srawi res x phantom-bits)
 657          (inst rlwinm res x
 658                (mod (- 32 posn (- phantom-bits)) 32)
 659                (- 32 size n-fixnum-tag-bits)
 660                (- 31 n-fixnum-tag-bits)))
 661         (t
 662          (inst rlwinm res x
 663                (mod (- 32 posn) 32)     ; effectively rotate right
 664                (- 32 size n-fixnum-tag-bits)
 665                (- 31 n-fixnum-tag-bits)))))))
 666
 667 (define-vop (ldb-c/signed)
 668   (:translate %%ldb)
 669   (:args (x :scs (signed-reg)))
 670   (:arg-types signed-num (:constant (integer 1 29)) (:constant (integer 0 31)))
 671   (:info size posn)
 672   (:results (res :scs (any-reg)))
 673   (:result-types tagged-num)
 674   (:policy :fast-safe)
 675   (:generator 3
 676     (inst rlwinm res x
 677           (mod (- (+ 32 n-fixnum-tag-bits) posn) 32)
 678           (- 32 size n-fixnum-tag-bits)
 679           (- 31 n-fixnum-tag-bits))))
 680
 681 (define-vop (ldb-c/unsigned)
 682   (:translate %%ldb)
 683   (:args (x :scs (unsigned-reg)))
 684   (:arg-types unsigned-num (:constant (integer 1 29)) (:constant (integer 0 31)))
 685   (:info size posn)
 686   (:results (res :scs (any-reg)))
 687   (:result-types tagged-num)
 688   (:policy :fast-safe)
 689   (:generator 3
 690     (inst rlwinm res x
 691           (mod (- (+ 32 n-fixnum-tag-bits) posn) 32)
 692           (- 32 size n-fixnum-tag-bits)
 693           (- 31 n-fixnum-tag-bits))))
 694 \f
 695 ;;;; Modular functions:
 696 (define-modular-fun lognot-mod32 (x) lognot :untagged nil 32)
 697 (define-vop (lognot-mod32/unsigned=>unsigned)
 698   (:translate lognot-mod32)
 699   (:args (x :scs (unsigned-reg)))
 700   (:arg-types unsigned-num)
 701   (:results (res :scs (unsigned-reg)))
 702   (:result-types unsigned-num)
 703   (:policy :fast-safe)
 704   (:generator 1
 705     (inst not res x)))
 706
 707 (define-vop (fast-ash-left-mod32-c/unsigned=>unsigned
 708              fast-ash-c/unsigned=>unsigned)
 709   (:translate ash-left-mod32))
 710
 711 (define-vop (fast-ash-left-mod32/unsigned=>unsigned
 712              fast-ash-left/unsigned=>unsigned))
 713 (deftransform ash-left-mod32 ((integer count)
 714                               ((unsigned-byte 32) (unsigned-byte 5)))
 715   (when (sb!c::constant-lvar-p count)
 716     (sb!c::give-up-ir1-transform))
 717   '(%primitive fast-ash-left-mod32/unsigned=>unsigned integer count))
 718
 719 (macrolet
 720     ((define-modular-backend (fun &optional constantp)
 721        (let ((mfun-name (symbolicate fun '-mod32))
 722              (modvop (symbolicate 'fast- fun '-mod32/unsigned=>unsigned))
 723              (modcvop (symbolicate 'fast- fun 'mod32-c/unsigned=>unsigned))
 724              (vop (symbolicate 'fast- fun '/unsigned=>unsigned))
 725              (cvop (symbolicate 'fast- fun '-c/unsigned=>unsigned)))
 726          `(progn
 727             (define-modular-fun ,mfun-name (x y) ,fun :untagged nil 32)
 728             (define-vop (,modvop ,vop)
 729               (:translate ,mfun-name))
 730             ,@(when constantp
 731                 `((define-vop (,modcvop ,cvop)
 732                     (:translate ,mfun-name))))))))
 733   (define-modular-backend + t)
 734   (define-modular-backend - t)
 735   (define-modular-backend * t)
 736   (define-modular-backend logeqv)
 737   (define-modular-backend lognand)
 738   (define-modular-backend lognor)
 739   (define-modular-backend logandc1)
 740   (define-modular-backend logandc2)
 741   (define-modular-backend logorc1)
 742   (define-modular-backend logorc2))
 743 \f
 744 ;;;; Binary conditional VOPs:
 745
 746 (define-vop (fast-conditional)
 747   (:conditional)
 748   (:info target not-p)
 749   (:effects)
 750   (:affected)
 751   (:policy :fast-safe))
 752
 753 (define-vop (fast-conditional/fixnum fast-conditional)
 754   (:args (x :scs (any-reg zero))
 755          (y :scs (any-reg zero)))
 756   (:arg-types tagged-num tagged-num)
 757   (:note "inline fixnum comparison"))
 758
 759 (define-vop (fast-conditional-c/fixnum fast-conditional/fixnum)
 760   (:args (x :scs (any-reg zero)))
 761   (:arg-types tagged-num (:constant (signed-byte 14)))
 762   (:info target not-p y))
 763
 764 (define-vop (fast-conditional/signed fast-conditional)
 765   (:args (x :scs (signed-reg zero))
 766          (y :scs (signed-reg zero)))
 767   (:arg-types signed-num signed-num)
 768   (:note "inline (signed-byte 32) comparison"))
 769
 770 (define-vop (fast-conditional-c/signed fast-conditional/signed)
 771   (:args (x :scs (signed-reg zero)))
 772   (:arg-types signed-num (:constant (signed-byte 16)))
 773   (:info target not-p y))
 774
 775 (define-vop (fast-conditional/unsigned fast-conditional)
 776   (:args (x :scs (unsigned-reg zero))
 777          (y :scs (unsigned-reg zero)))
 778   (:arg-types unsigned-num unsigned-num)
 779   (:note "inline (unsigned-byte 32) comparison"))
 780
 781 (define-vop (fast-conditional-c/unsigned fast-conditional/unsigned)
 782   (:args (x :scs (unsigned-reg zero)))
 783   (:arg-types unsigned-num (:constant (unsigned-byte 16)))
 784   (:info target not-p y))
 785
 786 (macrolet ((define-logtest-vops ()
 787              `(progn
 788                ,@(loop for suffix in '(/fixnum -c/fixnum
 789                                        /signed -c/signed
 790                                        /unsigned -c/unsigned)
 791                        for sc in '(any-reg any-reg
 792                                    signed-reg signed-reg
 793                                    unsigned-reg unsigned-reg)
 794                        for cost in '(4 3 6 5 6 5)
 795                        collect
 796                        `(define-vop (,(symbolicate "FAST-LOGTEST" suffix)
 797                                      ,(symbolicate "FAST-CONDITIONAL" suffix))
 798                          (:translate logtest)
 799                          (:temporary (:scs (,sc) :to (:result 0)) test)
 800                          (:generator ,cost
 801                           ;; We could be a lot more sophisticated here and
 802                           ;; check for possibilities with ANDIS..
 803                           ,(if (string= "-C" suffix :end2 2)
 804                                `(inst andi. test x ,(if (eq suffix '-c/fixnum)
 805                                                         '(fixnumize y)
 806                                                         'y))
 807                                `(inst and. test x y))
 808                           (inst b? (if not-p :eq :ne) target)))))))
 809   (define-logtest-vops))
 810
 811 (defknown %logbitp (integer unsigned-byte) boolean
 812   (movable foldable flushable always-translatable))
 813
 814 ;;; only for constant folding within the compiler
 815 (defun %logbitp (integer index)
 816   (logbitp index integer))
 817
 818 ;;; We only handle the constant cases because those are the only ones
 819 ;;; guaranteed to make it past COMBINATION-IMPLEMENTATION-STYLE.
 820 ;;;  --njf, 06-02-2006
 821 (define-vop (fast-logbitp-c/fixnum fast-conditional-c/fixnum)
 822   (:translate %logbitp)
 823   (:arg-types tagged-num (:constant (integer 0 29)))
 824   (:temporary (:scs (any-reg) :to (:result 0)) test)
 825   (:generator 4
 826     (if (< y 14)
 827         (inst andi. test x (ash 1 (+ y n-fixnum-tag-bits)))
 828         (inst andis. test x (ash 1 (- y 14))))
 829     (inst b? (if not-p :eq :ne) target)))
 830
 831 (define-vop (fast-logbitp-c/signed fast-conditional-c/signed)
 832   (:translate %logbitp)
 833   (:arg-types signed-num (:constant (integer 0 31)))
 834   (:temporary (:scs (signed-reg) :to (:result 0)) test)
 835   (:generator 4
 836     (if (< y 16)
 837         (inst andi. test x (ash 1 y))
 838         (inst andis. test x (ash 1 (- y 16))))
 839     (inst b? (if not-p :eq :ne) target)))
 840
 841 (define-vop (fast-logbitp-c/unsigned fast-conditional-c/unsigned)
 842   (:translate %logbitp)
 843   (:arg-types unsigned-num (:constant (integer 0 31)))
 844   (:temporary (:scs (unsigned-reg) :to (:result 0)) test)
 845   (:generator 4
 846     (if (< y 16)
 847         (inst andi. test x (ash 1 y))
 848         (inst andis. test x (ash 1 (- y 16))))
 849     (inst b? (if not-p :eq :ne) target)))
 850
 851 (define-vop (fast-if-</fixnum fast-conditional/fixnum)
 852   (:translate <)
 853   (:generator 4
 854     (inst cmpw x y)
 855     (inst b? (if not-p :ge :lt) target)))
 856
 857 (define-vop (fast-if-<-c/fixnum fast-conditional-c/fixnum)
 858   (:translate <)
 859   (:generator 3
 860     (inst cmpwi x (fixnumize y))
 861     (inst b? (if not-p :ge :lt) target)))
 862
 863 (define-vop (fast-if-</signed fast-conditional/signed)
 864   (:translate <)
 865   (:generator 6
 866     (inst cmpw x y)
 867     (inst b? (if not-p :ge :lt) target)))
 868
 869 (define-vop (fast-if-<-c/signed fast-conditional-c/signed)
 870   (:translate <)
 871   (:generator 5
 872     (inst cmpwi x y)
 873     (inst b? (if not-p :ge :lt) target)))
 874
 875 (define-vop (fast-if-</unsigned fast-conditional/unsigned)
 876   (:translate <)
 877   (:generator 6
 878     (inst cmplw x y)
 879     (inst b? (if not-p :ge :lt) target)))
 880
 881 (define-vop (fast-if-<-c/unsigned fast-conditional-c/unsigned)
 882   (:translate <)
 883   (:generator 5
 884     (inst cmplwi x y)
 885     (inst b? (if not-p :ge :lt) target)))
 886
 887 (define-vop (fast-if->/fixnum fast-conditional/fixnum)
 888   (:translate >)
 889   (:generator 4
 890     (inst cmpw x y)
 891     (inst b? (if not-p :le :gt) target)))
 892
 893 (define-vop (fast-if->-c/fixnum fast-conditional-c/fixnum)
 894   (:translate >)
 895   (:generator 3
 896     (inst cmpwi x (fixnumize y))
 897     (inst b? (if not-p :le :gt) target)))
 898
 899 (define-vop (fast-if->/signed fast-conditional/signed)
 900   (:translate >)
 901   (:generator 6
 902     (inst cmpw x y)
 903     (inst b? (if not-p :le :gt) target)))
 904
 905 (define-vop (fast-if->-c/signed fast-conditional-c/signed)
 906   (:translate >)
 907   (:generator 5
 908     (inst cmpwi x y)
 909     (inst b? (if not-p :le :gt) target)))
 910
 911 (define-vop (fast-if->/unsigned fast-conditional/unsigned)
 912   (:translate >)
 913   (:generator 6
 914     (inst cmplw x y)
 915     (inst b? (if not-p :le :gt) target)))
 916
 917 (define-vop (fast-if->-c/unsigned fast-conditional-c/unsigned)
 918   (:translate >)
 919   (:generator 5
 920     (inst cmplwi x y)
 921     (inst b? (if not-p :le :gt) target)))
 922
 923 (define-vop (fast-if-eql/signed fast-conditional/signed)
 924   (:translate eql)
 925   (:generator 6
 926     (inst cmpw x y)
 927     (inst b? (if not-p :ne :eq) target)))
 928
 929 (define-vop (fast-if-eql-c/signed fast-conditional-c/signed)
 930   (:translate eql)
 931   (:generator 5
 932     (inst cmpwi x y)
 933     (inst b? (if not-p :ne :eq) target)))
 934
 935 (define-vop (fast-if-eql/unsigned fast-conditional/unsigned)
 936   (:translate eql)
 937   (:generator 6
 938     (inst cmplw x y)
 939     (inst b? (if not-p :ne :eq) target)))
 940
 941 (define-vop (fast-if-eql-c/unsigned fast-conditional-c/unsigned)
 942   (:translate eql)
 943   (:generator 5
 944     (inst cmplwi x y)
 945     (inst b? (if not-p :ne :eq) target)))
 946
 947
 948 ;;; EQL/FIXNUM is funny because the first arg can be of any type, not just a
 949 ;;; known fixnum.
 950
 951 ;;; These versions specify a fixnum restriction on their first arg.  We have
 952 ;;; also generic-eql/fixnum VOPs which are the same, but have no restriction on
 953 ;;; the first arg and a higher cost.  The reason for doing this is to prevent
 954 ;;; fixnum specific operations from being used on word integers, spuriously
 955 ;;; consing the argument.
 956 ;;;
 957
 958 (define-vop (fast-eql/fixnum fast-conditional)
 959   (:args (x :scs (any-reg descriptor-reg zero))
 960          (y :scs (any-reg zero)))
 961   (:arg-types tagged-num tagged-num)
 962   (:note "inline fixnum comparison")
 963   (:translate eql)
 964   (:generator 4
 965     (inst cmpw x y)
 966     (inst b? (if not-p :ne :eq) target)))
 967 ;;;
 968 (define-vop (generic-eql/fixnum fast-eql/fixnum)
 969   (:arg-types * tagged-num)
 970   (:variant-cost 7))
 971
 972 (define-vop (fast-eql-c/fixnum fast-conditional/fixnum)
 973   (:args (x :scs (any-reg descriptor-reg zero)))
 974   (:arg-types tagged-num (:constant (signed-byte 14)))
 975   (:info target not-p y)
 976   (:translate eql)
 977   (:generator 2
 978     (inst cmpwi x (fixnumize y))
 979     (inst b? (if not-p :ne :eq) target)))
 980 ;;;
 981 (define-vop (generic-eql-c/fixnum fast-eql-c/fixnum)
 982   (:arg-types * (:constant (signed-byte 11)))
 983   (:variant-cost 6))
 984
 985 \f
 986 ;;;; 32-bit logical operations
 987
 988 (define-vop (shift-towards-someplace)
 989   (:policy :fast-safe)
 990   (:args (num :scs (unsigned-reg))
 991          (amount :scs (signed-reg)))
 992   (:arg-types unsigned-num tagged-num)
 993   (:results (r :scs (unsigned-reg)))
 994   (:result-types unsigned-num))
 995
 996 (define-vop (shift-towards-start shift-towards-someplace)
 997   (:translate shift-towards-start)
 998   (:note "shift-towards-start")
 999   (:generator 1
1000     (inst rlwinm amount amount 0 27 31)
1001     (inst slw r num amount)))
1002
1003 (define-vop (shift-towards-end shift-towards-someplace)
1004   (:translate shift-towards-end)
1005   (:note "shift-towards-end")
1006   (:generator 1
1007     (inst rlwinm amount amount 0 27 31)
1008     (inst srw r num amount)))
1009 \f
1010 ;;;; Bignum stuff.
1011
1012 (define-vop (bignum-length get-header-data)
1013   (:translate sb!bignum:%bignum-length)
1014   (:policy :fast-safe))
1015
1016 (define-vop (bignum-set-length set-header-data)
1017   (:translate sb!bignum:%bignum-set-length)
1018   (:policy :fast-safe))
1019
1020 (define-vop (bignum-ref word-index-ref)
1021   (:variant bignum-digits-offset other-pointer-lowtag)
1022   (:translate sb!bignum:%bignum-ref)
1023   (:results (value :scs (unsigned-reg)))
1024   (:result-types unsigned-num))
1025
1026 (define-vop (bignum-set word-index-set)
1027   (:variant bignum-digits-offset other-pointer-lowtag)
1028   (:translate sb!bignum:%bignum-set)
1029   (:args (object :scs (descriptor-reg))
1030          (index :scs (any-reg immediate zero))
1031          (value :scs (unsigned-reg)))
1032   (:arg-types t positive-fixnum unsigned-num)
1033   (:results (result :scs (unsigned-reg)))
1034   (:result-types unsigned-num))
1035
1036 (define-vop (digit-0-or-plus)
1037   (:translate sb!bignum:%digit-0-or-plusp)
1038   (:policy :fast-safe)
1039   (:args (digit :scs (unsigned-reg)))
1040   (:arg-types unsigned-num)
1041   (:results (result :scs (descriptor-reg)))
1042   (:generator 3
1043     (let ((done (gen-label)))
1044       (inst cmpwi digit 0)
1045       (move result null-tn)
1046       (inst blt done)
1047       (load-symbol result t)
1048       (emit-label done))))
1049
1050 (define-vop (add-w/carry)
1051   (:translate sb!bignum:%add-with-carry)
1052   (:policy :fast-safe)
1053   (:args (a :scs (unsigned-reg))
1054          (b :scs (unsigned-reg))
1055          (c :scs (any-reg)))
1056   (:arg-types unsigned-num unsigned-num positive-fixnum)
1057   (:temporary (:scs (unsigned-reg)) temp)
1058   (:results (result :scs (unsigned-reg))
1059             (carry :scs (unsigned-reg)))
1060   (:result-types unsigned-num positive-fixnum)
1061   (:generator 3
1062     (inst addic temp c -1)
1063     (inst adde result a b)
1064     (inst addze carry zero-tn)))
1065
1066 (define-vop (sub-w/borrow)
1067   (:translate sb!bignum:%subtract-with-borrow)
1068   (:policy :fast-safe)
1069   (:args (a :scs (unsigned-reg))
1070          (b :scs (unsigned-reg))
1071          (c :scs (any-reg)))
1072   (:arg-types unsigned-num unsigned-num positive-fixnum)
1073   (:temporary (:scs (unsigned-reg)) temp)
1074   (:results (result :scs (unsigned-reg))
1075             (borrow :scs (unsigned-reg)))
1076   (:result-types unsigned-num positive-fixnum)
1077   (:generator 4
1078     (inst addic temp c -1)
1079     (inst sube result a b)
1080     (inst addze borrow zero-tn)))
1081
1082 (define-vop (bignum-mult-and-add-3-arg)
1083   (:translate sb!bignum:%multiply-and-add)
1084   (:policy :fast-safe)
1085   (:args (x :scs (unsigned-reg))
1086          (y :scs (unsigned-reg))
1087          (carry-in :scs (unsigned-reg) :to (:eval 1)))
1088   (:arg-types unsigned-num unsigned-num unsigned-num)
1089   (:temporary (:scs (unsigned-reg) :to (:result 0) :target hi) hi-temp)
1090   (:temporary (:scs (unsigned-reg) :from (:eval 0) :to (:result 1)
1091                     :target lo) lo-temp)
1092   (:results (hi :scs (unsigned-reg))
1093             (lo :scs (unsigned-reg)))
1094   (:result-types unsigned-num unsigned-num)
1095   (:generator 40
1096     (inst mulhwu hi-temp x y)
1097     (inst mullw lo-temp x y)
1098     (inst addc lo lo-temp carry-in)
1099     (inst addze hi hi-temp)))
1100
1101 (define-vop (bignum-mult-and-add-4-arg)
1102   (:translate sb!bignum:%multiply-and-add)
1103   (:policy :fast-safe)
1104   (:args (x :scs (unsigned-reg))
1105          (y :scs (unsigned-reg))
1106          (prev :scs (unsigned-reg) :to (:eval 1))
1107          (carry-in :scs (unsigned-reg) :to (:eval 1)))
1108   (:arg-types unsigned-num unsigned-num unsigned-num unsigned-num)
1109   (:temporary (:scs (unsigned-reg) :to (:result 0) :target hi) hi-temp)
1110   (:temporary (:scs (unsigned-reg) :from (:eval 0) :to (:result 1)
1111                     :target lo) lo-temp)
1112   (:results (hi :scs (unsigned-reg))
1113             (lo :scs (unsigned-reg)))
1114   (:result-types unsigned-num unsigned-num)
1115   (:generator 40
1116     (inst mulhwu hi-temp x y)
1117     (inst mullw lo-temp x y)
1118     (inst addc lo-temp lo-temp carry-in)
1119     (inst addze hi-temp hi-temp)
1120     (inst addc lo lo-temp prev)
1121     (inst addze hi hi-temp)))
1122
1123 (define-vop (bignum-mult)
1124   (:translate sb!bignum:%multiply)
1125   (:policy :fast-safe)
1126   (:args (x :scs (unsigned-reg) :to (:eval 1))
1127          (y :scs (unsigned-reg) :to (:eval 1)))
1128   (:arg-types unsigned-num unsigned-num)
1129   (:results (hi :scs (unsigned-reg) :from (:eval 1))
1130             (lo :scs (unsigned-reg) :from (:eval 0)))
1131   (:result-types unsigned-num unsigned-num)
1132   (:generator 40
1133     (inst mullw lo x y)
1134     (inst mulhwu hi x y)))
1135
1136 #!+multiply-high-vops
1137 (define-vop (mulhi)
1138   (:translate %multiply-high)
1139   (:policy :fast-safe)
1140   (:args (x :scs (unsigned-reg))
1141          (y :scs (unsigned-reg)))
1142   (:arg-types unsigned-num unsigned-num)
1143   (:results (hi :scs (unsigned-reg)))
1144   (:result-types unsigned-num)
1145   (:generator 20
1146     (inst mulhwu hi x y)))
1147
1148 #!+multiply-high-vops
1149 (define-vop (mulhi/fx)
1150   (:translate %multiply-high)
1151   (:policy :fast-safe)
1152   (:args (x :scs (any-reg))
1153          (y :scs (unsigned-reg)))
1154   (:arg-types positive-fixnum unsigned-num)
1155   (:temporary (:sc non-descriptor-reg :from :eval :to :result) temp)
1156   (:temporary (:sc non-descriptor-reg :from :eval :to :result) mask)
1157   (:results (hi :scs (any-reg)))
1158   (:result-types positive-fixnum)
1159   (:generator 15
1160     (inst mulhwu temp x y)
1161     (inst lr mask fixnum-tag-mask)
1162     (inst andc hi temp mask)))
1163
1164 (define-vop (bignum-lognot lognot-mod32/unsigned=>unsigned)
1165   (:translate sb!bignum:%lognot))
1166
1167 (define-vop (fixnum-to-digit)
1168   (:translate sb!bignum:%fixnum-to-digit)
1169   (:policy :fast-safe)
1170   (:args (fixnum :scs (any-reg)))
1171   (:arg-types tagged-num)
1172   (:results (digit :scs (unsigned-reg)))
1173   (:result-types unsigned-num)
1174   (:generator 1
1175     (inst srawi digit fixnum n-fixnum-tag-bits)))
1176
1177
1178 (define-vop (bignum-floor)
1179   (:translate sb!bignum:%bigfloor)
1180   (:policy :fast-safe)
1181   (:args (num-high :scs (unsigned-reg) :target rem)
1182          (num-low :scs (unsigned-reg) :target rem-low)
1183          (denom :scs (unsigned-reg) :to (:eval 1)))
1184   (:arg-types unsigned-num unsigned-num unsigned-num)
1185   (:temporary (:scs (unsigned-reg) :from (:argument 1)) rem-low)
1186   (:temporary (:scs (unsigned-reg) :from (:eval 0)) temp)
1187   (:results (quo :scs (unsigned-reg) :from (:eval 0))
1188             (rem :scs (unsigned-reg) :from (:argument 0)))
1189   (:result-types unsigned-num unsigned-num)
1190   (:generator 325 ; number of inst assuming targeting works.
1191     (move rem num-high)
1192     (move rem-low num-low)
1193     (flet ((maybe-subtract (&optional (guess temp))
1194              (inst subi temp guess 1)
1195              (inst and temp temp denom)
1196              (inst sub rem rem temp))
1197            (sltu (res x y)
1198              (inst subfc res y x)
1199              (inst subfe res res res)
1200              (inst neg res res)))
1201       (sltu quo rem denom)
1202       (maybe-subtract quo)
1203       (dotimes (i 32)
1204         (inst slwi rem rem 1)
1205         (inst srwi temp rem-low 31)
1206         (inst or rem rem temp)
1207         (inst slwi rem-low rem-low 1)
1208         (sltu temp rem denom)
1209         (inst slwi quo quo 1)
1210         (inst or quo quo temp)
1211         (maybe-subtract)))
1212     (inst not quo quo)))
1213
1214 #|
1215
1216 (define-vop (bignum-floor)
1217   (:translate sb!bignum:%bigfloor)
1218   (:policy :fast-safe)
1219   (:args (div-high :scs (unsigned-reg) :target rem)
1220          (div-low :scs (unsigned-reg) :target quo)
1221          (divisor :scs (unsigned-reg)))
1222   (:arg-types unsigned-num unsigned-num unsigned-num)
1223   (:results (quo :scs (unsigned-reg) :from (:argument 1))
1224             (rem :scs (unsigned-reg) :from (:argument 0)))
1225   (:result-types unsigned-num unsigned-num)
1226   (:generator 300
1227     (inst mtmq div-low)
1228     (inst div quo div-high divisor)
1229     (inst mfmq rem)))
1230 |#
1231
1232 (define-vop (signify-digit)
1233   (:translate sb!bignum:%fixnum-digit-with-correct-sign)
1234   (:policy :fast-safe)
1235   (:args (digit :scs (unsigned-reg) :target res))
1236   (:arg-types unsigned-num)
1237   (:results (res :scs (any-reg signed-reg)))
1238   (:result-types signed-num)
1239   (:generator 1
1240     (sc-case res
1241       (any-reg
1242        (inst slwi res digit n-fixnum-tag-bits))
1243       (signed-reg
1244        (move res digit)))))
1245
1246
1247 (define-vop (digit-ashr)
1248   (:translate sb!bignum:%ashr)
1249   (:policy :fast-safe)
1250   (:args (digit :scs (unsigned-reg))
1251          (count :scs (unsigned-reg)))
1252   (:arg-types unsigned-num positive-fixnum)
1253   (:results (result :scs (unsigned-reg)))
1254   (:result-types unsigned-num)
1255   (:generator 1
1256     (inst sraw result digit count)))
1257
1258 (define-vop (digit-lshr digit-ashr)
1259   (:translate sb!bignum:%digit-logical-shift-right)
1260   (:generator 1
1261     (inst srw result digit count)))
1262
1263 (define-vop (digit-ashl digit-ashr)
1264   (:translate sb!bignum:%ashl)
1265   (:generator 1
1266     (inst slw result digit count)))
1267
1268 \f
1269 ;;;; Static funs.
1270
1271 (define-static-fun two-arg-gcd (x y) :translate gcd)
1272 (define-static-fun two-arg-lcm (x y) :translate lcm)
1273
1274 (define-static-fun two-arg-+ (x y) :translate +)
1275 (define-static-fun two-arg-- (x y) :translate -)
1276 (define-static-fun two-arg-* (x y) :translate *)
1277 (define-static-fun two-arg-/ (x y) :translate /)
1278
1279 (define-static-fun two-arg-< (x y) :translate <)
1280 (define-static-fun two-arg-<= (x y) :translate <=)
1281 (define-static-fun two-arg-> (x y) :translate >)
1282 (define-static-fun two-arg->= (x y) :translate >=)
1283 (define-static-fun two-arg-= (x y) :translate =)
1284 (define-static-fun two-arg-/= (x y) :translate /=)
1285
1286 (define-static-fun %negate (x) :translate %negate)
1287
1288 (define-static-fun two-arg-and (x y) :translate logand)
1289 (define-static-fun two-arg-ior (x y) :translate logior)
1290 (define-static-fun two-arg-xor (x y) :translate logxor)
1291 (define-static-fun two-arg-eqv (x y) :translate logeqv)
1292 \f
1293 (in-package "SB!C")
1294
1295 (deftransform * ((x y)
1296                  ((unsigned-byte 32) (constant-arg (unsigned-byte 32)))
1297                  (unsigned-byte 32))
1298   "recode as shifts and adds"
1299   (let ((y (lvar-value y)))
1300     (multiple-value-bind (result adds shifts)
1301         (ub32-strength-reduce-constant-multiply 'x y)
1302       (cond
1303        ((typep y '(signed-byte 16))
1304         ;; a mulli instruction has a latency of 5.
1305         (when (> (+ adds shifts) 4)
1306           (give-up-ir1-transform)))
1307        (t
1308         ;; a mullw instruction also has a latency of 5, plus two
1309         ;; instructions (in general) to load the immediate into a
1310         ;; register.
1311         (when (> (+ adds shifts) 6)
1312           (give-up-ir1-transform))))
1313       (or result 0))))