1 ;;;; the VM definition of arithmetic VOPs for the x86
3 ;;;; This software is part of the SBCL system. See the README file for
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.
16 (define-vop (fast-safe-arith-op)
21 (define-vop (fixnum-unop fast-safe-arith-op)
22 (:args (x :scs (any-reg) :target res))
23 (:results (res :scs (any-reg)))
24 (:note "inline fixnum arithmetic")
25 (:arg-types tagged-num)
26 (:result-types tagged-num))
28 (define-vop (signed-unop fast-safe-arith-op)
29 (:args (x :scs (signed-reg) :target res))
30 (:results (res :scs (signed-reg)))
31 (:note "inline (signed-byte 32) arithmetic")
32 (:arg-types signed-num)
33 (:result-types signed-num))
35 (define-vop (fast-negate/fixnum fixnum-unop)
41 (define-vop (fast-negate/signed signed-unop)
47 (define-vop (fast-lognot/fixnum fixnum-unop)
51 (inst xor res (fixnumize -1))))
53 (define-vop (fast-lognot/signed signed-unop)
59 ;;;; binary fixnum operations
61 ;;; Assume that any constant operand is the second arg...
63 (define-vop (fast-fixnum-binop fast-safe-arith-op)
64 (:args (x :target r :scs (any-reg)
65 :load-if (not (and (sc-is x control-stack)
67 (sc-is r control-stack)
69 (y :scs (any-reg control-stack)))
70 (:arg-types tagged-num tagged-num)
71 (:results (r :scs (any-reg) :from (:argument 0)
72 :load-if (not (and (sc-is x control-stack)
74 (sc-is r control-stack)
76 (:result-types tagged-num)
77 (:note "inline fixnum arithmetic"))
79 (define-vop (fast-unsigned-binop fast-safe-arith-op)
80 (:args (x :target r :scs (unsigned-reg)
81 :load-if (not (and (sc-is x unsigned-stack)
82 (sc-is y unsigned-reg)
83 (sc-is r unsigned-stack)
85 (y :scs (unsigned-reg unsigned-stack)))
86 (:arg-types unsigned-num unsigned-num)
87 (:results (r :scs (unsigned-reg) :from (:argument 0)
88 :load-if (not (and (sc-is x unsigned-stack)
89 (sc-is y unsigned-reg)
90 (sc-is r unsigned-stack)
92 (:result-types unsigned-num)
93 (:note "inline (unsigned-byte 32) arithmetic"))
95 (define-vop (fast-signed-binop fast-safe-arith-op)
96 (:args (x :target r :scs (signed-reg)
97 :load-if (not (and (sc-is x signed-stack)
99 (sc-is r signed-stack)
101 (y :scs (signed-reg signed-stack)))
102 (:arg-types signed-num signed-num)
103 (:results (r :scs (signed-reg) :from (:argument 0)
104 :load-if (not (and (sc-is x signed-stack)
106 (sc-is r signed-stack)
108 (:result-types signed-num)
109 (:note "inline (signed-byte 32) arithmetic"))
111 (define-vop (fast-fixnum-binop-c fast-safe-arith-op)
112 (:args (x :target r :scs (any-reg control-stack)))
114 (:arg-types tagged-num (:constant (signed-byte 30)))
115 (:results (r :scs (any-reg)
116 :load-if (not (location= x r))))
117 (:result-types tagged-num)
118 (:note "inline fixnum arithmetic"))
120 (define-vop (fast-unsigned-binop-c fast-safe-arith-op)
121 (:args (x :target r :scs (unsigned-reg unsigned-stack)))
123 (:arg-types unsigned-num (:constant (unsigned-byte 32)))
124 (:results (r :scs (unsigned-reg)
125 :load-if (not (location= x r))))
126 (:result-types unsigned-num)
127 (:note "inline (unsigned-byte 32) arithmetic"))
129 (define-vop (fast-signed-binop-c fast-safe-arith-op)
130 (:args (x :target r :scs (signed-reg signed-stack)))
132 (:arg-types signed-num (:constant (signed-byte 32)))
133 (:results (r :scs (signed-reg)
134 :load-if (not (location= x r))))
135 (:result-types signed-num)
136 (:note "inline (signed-byte 32) arithmetic"))
138 (macrolet ((define-binop (translate untagged-penalty op)
140 (define-vop (,(symbolicate "FAST-" translate "/FIXNUM=>FIXNUM")
142 (:translate ,translate)
146 (define-vop (,(symbolicate 'fast- translate '-c/fixnum=>fixnum)
148 (:translate ,translate)
151 (inst ,op r (fixnumize y))))
152 (define-vop (,(symbolicate "FAST-" translate "/SIGNED=>SIGNED")
154 (:translate ,translate)
155 (:generator ,(1+ untagged-penalty)
158 (define-vop (,(symbolicate 'fast- translate '-c/signed=>signed)
160 (:translate ,translate)
161 (:generator ,untagged-penalty
164 (define-vop (,(symbolicate "FAST-"
166 "/UNSIGNED=>UNSIGNED")
168 (:translate ,translate)
169 (:generator ,(1+ untagged-penalty)
172 (define-vop (,(symbolicate 'fast-
174 '-c/unsigned=>unsigned)
175 fast-unsigned-binop-c)
176 (:translate ,translate)
177 (:generator ,untagged-penalty
179 ,(if (eq translate 'logand)
180 ;; for the -C/UNSIGNED=>UNSIGNED VOP, this case
181 ;; is optimized away as an identity somewhere
182 ;; along the lines. However, this VOP is used in
183 ;; -C/SIGNED=>UNSIGNED, below, when the
184 ;; higher-level lisp code can't optimize away the
185 ;; non-trivial identity.
186 `(unless (= y #.(1- (ash 1 n-word-bits)))
188 `(inst ,op r y)))))))
189 (define-binop - 4 sub)
190 (define-binop logand 2 and)
191 (define-binop logior 2 or)
192 (define-binop logxor 2 xor))
194 ;;; Special handling of add on the x86; can use lea to avoid a
195 ;;; register load, otherwise it uses add.
196 (define-vop (fast-+/fixnum=>fixnum fast-safe-arith-op)
198 (:args (x :scs (any-reg) :target r
199 :load-if (not (and (sc-is x control-stack)
201 (sc-is r control-stack)
203 (y :scs (any-reg control-stack)))
204 (:arg-types tagged-num tagged-num)
205 (:results (r :scs (any-reg) :from (:argument 0)
206 :load-if (not (and (sc-is x control-stack)
208 (sc-is r control-stack)
210 (:result-types tagged-num)
211 (:note "inline fixnum arithmetic")
213 (cond ((and (sc-is x any-reg) (sc-is y any-reg) (sc-is r any-reg)
214 (not (location= x r)))
215 (inst lea r (make-ea :dword :base x :index y :scale 1)))
220 (define-vop (fast-+-c/fixnum=>fixnum fast-safe-arith-op)
222 (:args (x :target r :scs (any-reg control-stack)))
224 (:arg-types tagged-num (:constant (signed-byte 30)))
225 (:results (r :scs (any-reg)
226 :load-if (not (location= x r))))
227 (:result-types tagged-num)
228 (:note "inline fixnum arithmetic")
230 (cond ((and (sc-is x any-reg) (sc-is r any-reg) (not (location= x r)))
231 (inst lea r (make-ea :dword :base x :disp (fixnumize y))))
234 (inst add r (fixnumize y))))))
236 (define-vop (fast-+/signed=>signed fast-safe-arith-op)
238 (:args (x :scs (signed-reg) :target r
239 :load-if (not (and (sc-is x signed-stack)
241 (sc-is r signed-stack)
243 (y :scs (signed-reg signed-stack)))
244 (:arg-types signed-num signed-num)
245 (:results (r :scs (signed-reg) :from (:argument 0)
246 :load-if (not (and (sc-is x signed-stack)
249 (:result-types signed-num)
250 (:note "inline (signed-byte 32) arithmetic")
252 (cond ((and (sc-is x signed-reg) (sc-is y signed-reg) (sc-is r signed-reg)
253 (not (location= x r)))
254 (inst lea r (make-ea :dword :base x :index y :scale 1)))
259 ;;;; Special logand cases: (logand signed unsigned) => unsigned
261 (define-vop (fast-logand/signed-unsigned=>unsigned
262 fast-logand/unsigned=>unsigned)
263 (:args (x :target r :scs (signed-reg)
264 :load-if (not (and (sc-is x signed-stack)
265 (sc-is y unsigned-reg)
266 (sc-is r unsigned-stack)
268 (y :scs (unsigned-reg unsigned-stack)))
269 (:arg-types signed-num unsigned-num))
271 (define-vop (fast-logand-c/signed-unsigned=>unsigned
272 fast-logand-c/unsigned=>unsigned)
273 (:args (x :target r :scs (signed-reg signed-stack)))
274 (:arg-types signed-num (:constant (unsigned-byte 32))))
276 (define-vop (fast-logand/unsigned-signed=>unsigned
277 fast-logand/unsigned=>unsigned)
278 (:args (x :target r :scs (unsigned-reg)
279 :load-if (not (and (sc-is x unsigned-stack)
281 (sc-is r unsigned-stack)
283 (y :scs (signed-reg signed-stack)))
284 (:arg-types unsigned-num signed-num))
287 (define-vop (fast-+-c/signed=>signed fast-safe-arith-op)
289 (:args (x :target r :scs (signed-reg signed-stack)))
291 (:arg-types signed-num (:constant (signed-byte 32)))
292 (:results (r :scs (signed-reg)
293 :load-if (not (location= x r))))
294 (:result-types signed-num)
295 (:note "inline (signed-byte 32) arithmetic")
297 (cond ((and (sc-is x signed-reg) (sc-is r signed-reg)
298 (not (location= x r)))
299 (inst lea r (make-ea :dword :base x :disp y)))
306 (define-vop (fast-+/unsigned=>unsigned fast-safe-arith-op)
308 (:args (x :scs (unsigned-reg) :target r
309 :load-if (not (and (sc-is x unsigned-stack)
310 (sc-is y unsigned-reg)
311 (sc-is r unsigned-stack)
313 (y :scs (unsigned-reg unsigned-stack)))
314 (:arg-types unsigned-num unsigned-num)
315 (:results (r :scs (unsigned-reg) :from (:argument 0)
316 :load-if (not (and (sc-is x unsigned-stack)
317 (sc-is y unsigned-reg)
318 (sc-is r unsigned-stack)
320 (:result-types unsigned-num)
321 (:note "inline (unsigned-byte 32) arithmetic")
323 (cond ((and (sc-is x unsigned-reg) (sc-is y unsigned-reg)
324 (sc-is r unsigned-reg) (not (location= x r)))
325 (inst lea r (make-ea :dword :base x :index y :scale 1)))
330 (define-vop (fast-+-c/unsigned=>unsigned fast-safe-arith-op)
332 (:args (x :target r :scs (unsigned-reg unsigned-stack)))
334 (:arg-types unsigned-num (:constant (unsigned-byte 32)))
335 (:results (r :scs (unsigned-reg)
336 :load-if (not (location= x r))))
337 (:result-types unsigned-num)
338 (:note "inline (unsigned-byte 32) arithmetic")
340 (cond ((and (sc-is x unsigned-reg) (sc-is r unsigned-reg)
341 (not (location= x r)))
342 (inst lea r (make-ea :dword :base x :disp y)))
349 ;;;; multiplication and division
351 (define-vop (fast-*/fixnum=>fixnum fast-safe-arith-op)
353 ;; We need different loading characteristics.
354 (:args (x :scs (any-reg) :target r)
355 (y :scs (any-reg control-stack)))
356 (:arg-types tagged-num tagged-num)
357 (:results (r :scs (any-reg) :from (:argument 0)))
358 (:result-types tagged-num)
359 (:note "inline fixnum arithmetic")
365 (define-vop (fast-*-c/fixnum=>fixnum fast-safe-arith-op)
367 ;; We need different loading characteristics.
368 (:args (x :scs (any-reg control-stack)))
370 (:arg-types tagged-num (:constant (signed-byte 30)))
371 (:results (r :scs (any-reg)))
372 (:result-types tagged-num)
373 (:note "inline fixnum arithmetic")
377 (define-vop (fast-*/signed=>signed fast-safe-arith-op)
379 ;; We need different loading characteristics.
380 (:args (x :scs (signed-reg) :target r)
381 (y :scs (signed-reg signed-stack)))
382 (:arg-types signed-num signed-num)
383 (:results (r :scs (signed-reg) :from (:argument 0)))
384 (:result-types signed-num)
385 (:note "inline (signed-byte 32) arithmetic")
390 (define-vop (fast-*-c/signed=>signed fast-safe-arith-op)
392 ;; We need different loading characteristics.
393 (:args (x :scs (signed-reg signed-stack)))
395 (:arg-types signed-num (:constant (signed-byte 32)))
396 (:results (r :scs (signed-reg)))
397 (:result-types signed-num)
398 (:note "inline (signed-byte 32) arithmetic")
402 (define-vop (fast-*/unsigned=>unsigned fast-safe-arith-op)
404 (:args (x :scs (unsigned-reg) :target eax)
405 (y :scs (unsigned-reg unsigned-stack)))
406 (:arg-types unsigned-num unsigned-num)
407 (:temporary (:sc unsigned-reg :offset eax-offset :target result
408 :from (:argument 0) :to :result) eax)
409 (:temporary (:sc unsigned-reg :offset edx-offset
410 :from :eval :to :result) edx)
412 (:results (result :scs (unsigned-reg)))
413 (:result-types unsigned-num)
414 (:note "inline (unsigned-byte 32) arithmetic")
416 (:save-p :compute-only)
423 (define-vop (fast-truncate/fixnum=>fixnum fast-safe-arith-op)
424 (:translate truncate)
425 (:args (x :scs (any-reg) :target eax)
426 (y :scs (any-reg control-stack)))
427 (:arg-types tagged-num tagged-num)
428 (:temporary (:sc signed-reg :offset eax-offset :target quo
429 :from (:argument 0) :to (:result 0)) eax)
430 (:temporary (:sc unsigned-reg :offset edx-offset :target rem
431 :from (:argument 0) :to (:result 1)) edx)
432 (:results (quo :scs (any-reg))
433 (rem :scs (any-reg)))
434 (:result-types tagged-num tagged-num)
435 (:note "inline fixnum arithmetic")
437 (:save-p :compute-only)
439 (let ((zero (generate-error-code vop division-by-zero-error x y)))
440 (if (sc-is y any-reg)
441 (inst test y y) ; smaller instruction
447 (if (location= quo eax)
449 (inst lea quo (make-ea :dword :index eax :scale 4)))
452 (define-vop (fast-truncate-c/fixnum=>fixnum fast-safe-arith-op)
453 (:translate truncate)
454 (:args (x :scs (any-reg) :target eax))
456 (:arg-types tagged-num (:constant (signed-byte 30)))
457 (:temporary (:sc signed-reg :offset eax-offset :target quo
458 :from :argument :to (:result 0)) eax)
459 (:temporary (:sc any-reg :offset edx-offset :target rem
460 :from :eval :to (:result 1)) edx)
461 (:temporary (:sc any-reg :from :eval :to :result) y-arg)
462 (:results (quo :scs (any-reg))
463 (rem :scs (any-reg)))
464 (:result-types tagged-num tagged-num)
465 (:note "inline fixnum arithmetic")
467 (:save-p :compute-only)
471 (inst mov y-arg (fixnumize y))
472 (inst idiv eax y-arg)
473 (if (location= quo eax)
475 (inst lea quo (make-ea :dword :index eax :scale 4)))
478 (define-vop (fast-truncate/unsigned=>unsigned fast-safe-arith-op)
479 (:translate truncate)
480 (:args (x :scs (unsigned-reg) :target eax)
481 (y :scs (unsigned-reg signed-stack)))
482 (:arg-types unsigned-num unsigned-num)
483 (:temporary (:sc unsigned-reg :offset eax-offset :target quo
484 :from (:argument 0) :to (:result 0)) eax)
485 (:temporary (:sc unsigned-reg :offset edx-offset :target rem
486 :from (:argument 0) :to (:result 1)) edx)
487 (:results (quo :scs (unsigned-reg))
488 (rem :scs (unsigned-reg)))
489 (:result-types unsigned-num unsigned-num)
490 (:note "inline (unsigned-byte 32) arithmetic")
492 (:save-p :compute-only)
494 (let ((zero (generate-error-code vop division-by-zero-error x y)))
495 (if (sc-is y unsigned-reg)
496 (inst test y y) ; smaller instruction
505 (define-vop (fast-truncate-c/unsigned=>unsigned fast-safe-arith-op)
506 (:translate truncate)
507 (:args (x :scs (unsigned-reg) :target eax))
509 (:arg-types unsigned-num (:constant (unsigned-byte 32)))
510 (:temporary (:sc unsigned-reg :offset eax-offset :target quo
511 :from :argument :to (:result 0)) eax)
512 (:temporary (:sc unsigned-reg :offset edx-offset :target rem
513 :from :eval :to (:result 1)) edx)
514 (:temporary (:sc unsigned-reg :from :eval :to :result) y-arg)
515 (:results (quo :scs (unsigned-reg))
516 (rem :scs (unsigned-reg)))
517 (:result-types unsigned-num unsigned-num)
518 (:note "inline (unsigned-byte 32) arithmetic")
520 (:save-p :compute-only)
529 (define-vop (fast-truncate/signed=>signed fast-safe-arith-op)
530 (:translate truncate)
531 (:args (x :scs (signed-reg) :target eax)
532 (y :scs (signed-reg signed-stack)))
533 (:arg-types signed-num signed-num)
534 (:temporary (:sc signed-reg :offset eax-offset :target quo
535 :from (:argument 0) :to (:result 0)) eax)
536 (:temporary (:sc signed-reg :offset edx-offset :target rem
537 :from (:argument 0) :to (:result 1)) edx)
538 (:results (quo :scs (signed-reg))
539 (rem :scs (signed-reg)))
540 (:result-types signed-num signed-num)
541 (:note "inline (signed-byte 32) arithmetic")
543 (:save-p :compute-only)
545 (let ((zero (generate-error-code vop division-by-zero-error x y)))
546 (if (sc-is y signed-reg)
547 (inst test y y) ; smaller instruction
556 (define-vop (fast-truncate-c/signed=>signed fast-safe-arith-op)
557 (:translate truncate)
558 (:args (x :scs (signed-reg) :target eax))
560 (:arg-types signed-num (:constant (signed-byte 32)))
561 (:temporary (:sc signed-reg :offset eax-offset :target quo
562 :from :argument :to (:result 0)) eax)
563 (:temporary (:sc signed-reg :offset edx-offset :target rem
564 :from :eval :to (:result 1)) edx)
565 (:temporary (:sc signed-reg :from :eval :to :result) y-arg)
566 (:results (quo :scs (signed-reg))
567 (rem :scs (signed-reg)))
568 (:result-types signed-num signed-num)
569 (:note "inline (signed-byte 32) arithmetic")
571 (:save-p :compute-only)
576 (inst idiv eax y-arg)
583 (define-vop (fast-ash-c/fixnum=>fixnum)
586 (:args (number :scs (any-reg) :target result
587 :load-if (not (and (sc-is number any-reg control-stack)
588 (sc-is result any-reg control-stack)
589 (location= number result)))))
591 (:arg-types tagged-num (:constant integer))
592 (:results (result :scs (any-reg)
593 :load-if (not (and (sc-is number control-stack)
594 (sc-is result control-stack)
595 (location= number result)))))
596 (:result-types tagged-num)
599 (cond ((and (= amount 1) (not (location= number result)))
600 (inst lea result (make-ea :dword :index number :scale 2)))
601 ((and (= amount 2) (not (location= number result)))
602 (inst lea result (make-ea :dword :index number :scale 4)))
603 ((and (= amount 3) (not (location= number result)))
604 (inst lea result (make-ea :dword :index number :scale 8)))
607 (cond ((plusp amount)
608 ;; We don't have to worry about overflow because of the
609 ;; result type restriction.
610 (inst shl result amount))
612 ;; If the amount is greater than 31, only shift by 31. We
613 ;; have to do this because the shift instructions only look
614 ;; at the low five bits of the result.
615 (inst sar result (min 31 (- amount)))
616 ;; Fixnum correction.
617 (inst and result #xfffffffc)))))))
619 (define-vop (fast-ash-left/fixnum=>fixnum)
621 (:args (number :scs (any-reg) :target result
622 :load-if (not (and (sc-is number control-stack)
623 (sc-is result control-stack)
624 (location= number result))))
625 (amount :scs (unsigned-reg) :target ecx))
626 (:arg-types tagged-num positive-fixnum)
627 (:temporary (:sc unsigned-reg :offset ecx-offset :from (:argument 1)) ecx)
628 (:results (result :scs (any-reg) :from (:argument 0)
629 :load-if (not (and (sc-is number control-stack)
630 (sc-is result control-stack)
631 (location= number result)))))
632 (:result-types tagged-num)
638 ;; The result-type ensures us that this shift will not overflow.
639 (inst shl result :cl)))
641 (define-vop (fast-ash-c/signed=>signed)
644 (:args (number :scs (signed-reg) :target result
645 :load-if (not (and (sc-is number signed-stack)
646 (sc-is result signed-stack)
647 (location= number result)))))
649 (:arg-types signed-num (:constant integer))
650 (:results (result :scs (signed-reg)
651 :load-if (not (and (sc-is number signed-stack)
652 (sc-is result signed-stack)
653 (location= number result)))))
654 (:result-types signed-num)
657 (cond ((and (= amount 1) (not (location= number result)))
658 (inst lea result (make-ea :dword :index number :scale 2)))
659 ((and (= amount 2) (not (location= number result)))
660 (inst lea result (make-ea :dword :index number :scale 4)))
661 ((and (= amount 3) (not (location= number result)))
662 (inst lea result (make-ea :dword :index number :scale 8)))
665 (cond ((plusp amount) (inst shl result amount))
666 (t (inst sar result (min 31 (- amount)))))))))
668 (define-vop (fast-ash-c/unsigned=>unsigned)
671 (:args (number :scs (unsigned-reg) :target result
672 :load-if (not (and (sc-is number unsigned-stack)
673 (sc-is result unsigned-stack)
674 (location= number result)))))
676 (:arg-types unsigned-num (:constant integer))
677 (:results (result :scs (unsigned-reg)
678 :load-if (not (and (sc-is number unsigned-stack)
679 (sc-is result unsigned-stack)
680 (location= number result)))))
681 (:result-types unsigned-num)
684 (cond ((and (= amount 1) (not (location= number result)))
685 (inst lea result (make-ea :dword :index number :scale 2)))
686 ((and (= amount 2) (not (location= number result)))
687 (inst lea result (make-ea :dword :index number :scale 4)))
688 ((and (= amount 3) (not (location= number result)))
689 (inst lea result (make-ea :dword :index number :scale 8)))
692 (cond ((< -32 amount 32)
693 ;; this code is used both in ASH and ASH-MOD32, so
696 (inst shl result amount)
697 (inst shr result (- amount))))
698 (t (if (sc-is result unsigned-reg)
699 (inst xor result result)
700 (inst mov result 0))))))))
702 (define-vop (fast-ash-left/signed=>signed)
704 (:args (number :scs (signed-reg) :target result
705 :load-if (not (and (sc-is number signed-stack)
706 (sc-is result signed-stack)
707 (location= number result))))
708 (amount :scs (unsigned-reg) :target ecx))
709 (:arg-types signed-num positive-fixnum)
710 (:temporary (:sc unsigned-reg :offset ecx-offset :from (:argument 1)) ecx)
711 (:results (result :scs (signed-reg) :from (:argument 0)
712 :load-if (not (and (sc-is number signed-stack)
713 (sc-is result signed-stack)
714 (location= number result)))))
715 (:result-types signed-num)
721 (inst shl result :cl)))
723 (define-vop (fast-ash-left/unsigned=>unsigned)
725 (:args (number :scs (unsigned-reg) :target result
726 :load-if (not (and (sc-is number unsigned-stack)
727 (sc-is result unsigned-stack)
728 (location= number result))))
729 (amount :scs (unsigned-reg) :target ecx))
730 (:arg-types unsigned-num positive-fixnum)
731 (:temporary (:sc unsigned-reg :offset ecx-offset :from (:argument 1)) ecx)
732 (:results (result :scs (unsigned-reg) :from (:argument 0)
733 :load-if (not (and (sc-is number unsigned-stack)
734 (sc-is result unsigned-stack)
735 (location= number result)))))
736 (:result-types unsigned-num)
742 (inst shl result :cl)))
744 (define-vop (fast-ash/signed=>signed)
747 (:args (number :scs (signed-reg) :target result)
748 (amount :scs (signed-reg) :target ecx))
749 (:arg-types signed-num signed-num)
750 (:results (result :scs (signed-reg) :from (:argument 0)))
751 (:result-types signed-num)
752 (:temporary (:sc signed-reg :offset ecx-offset :from (:argument 1)) ecx)
758 (inst jmp :ns positive)
764 (inst sar result :cl)
768 ;; The result-type ensures us that this shift will not overflow.
769 (inst shl result :cl)
773 (define-vop (fast-ash/unsigned=>unsigned)
776 (:args (number :scs (unsigned-reg) :target result)
777 (amount :scs (signed-reg) :target ecx))
778 (:arg-types unsigned-num signed-num)
779 (:results (result :scs (unsigned-reg) :from (:argument 0)))
780 (:result-types unsigned-num)
781 (:temporary (:sc signed-reg :offset ecx-offset :from (:argument 1)) ecx)
787 (inst jmp :ns positive)
791 (inst xor result result)
794 (inst shr result :cl)
798 ;; The result-type ensures us that this shift will not overflow.
799 (inst shl result :cl)
805 (defknown %lea (integer integer (member 1 2 4 8) (signed-byte 32))
807 (foldable flushable movable))
809 (defoptimizer (%lea derive-type) ((base index scale disp))
810 (when (and (constant-lvar-p scale)
811 (constant-lvar-p disp))
812 (let ((scale (lvar-value scale))
813 (disp (lvar-value disp))
814 (base-type (lvar-type base))
815 (index-type (lvar-type index)))
816 (when (and (numeric-type-p base-type)
817 (numeric-type-p index-type))
818 (let ((base-lo (numeric-type-low base-type))
819 (base-hi (numeric-type-high base-type))
820 (index-lo (numeric-type-low index-type))
821 (index-hi (numeric-type-high index-type)))
822 (make-numeric-type :class 'integer
824 :low (when (and base-lo index-lo)
825 (+ base-lo (* index-lo scale) disp))
826 :high (when (and base-hi index-hi)
827 (+ base-hi (* index-hi scale) disp))))))))
829 (defun %lea (base index scale disp)
830 (+ base (* index scale) disp))
834 (define-vop (%lea/unsigned=>unsigned)
837 (:args (base :scs (unsigned-reg))
838 (index :scs (unsigned-reg)))
840 (:arg-types unsigned-num unsigned-num
841 (:constant (member 1 2 4 8))
842 (:constant (signed-byte 32)))
843 (:results (r :scs (unsigned-reg)))
844 (:result-types unsigned-num)
846 (inst lea r (make-ea :dword :base base :index index
847 :scale scale :disp disp))))
849 (define-vop (%lea/signed=>signed)
852 (:args (base :scs (signed-reg))
853 (index :scs (signed-reg)))
855 (:arg-types signed-num signed-num
856 (:constant (member 1 2 4 8))
857 (:constant (signed-byte 32)))
858 (:results (r :scs (signed-reg)))
859 (:result-types signed-num)
861 (inst lea r (make-ea :dword :base base :index index
862 :scale scale :disp disp))))
864 (define-vop (%lea/fixnum=>fixnum)
867 (:args (base :scs (any-reg))
868 (index :scs (any-reg)))
870 (:arg-types tagged-num tagged-num
871 (:constant (member 1 2 4 8))
872 (:constant (signed-byte 32)))
873 (:results (r :scs (any-reg)))
874 (:result-types tagged-num)
876 (inst lea r (make-ea :dword :base base :index index
877 :scale scale :disp disp))))
879 ;;; FIXME: before making knowledge of this too public, it needs to be
880 ;;; fixed so that it's actually _faster_ than the non-CMOV version; at
881 ;;; least on my Celeron-XXX laptop, this version is marginally slower
882 ;;; than the above version with branches. -- CSR, 2003-09-04
883 (define-vop (fast-cmov-ash/unsigned=>unsigned)
886 (:args (number :scs (unsigned-reg) :target result)
887 (amount :scs (signed-reg) :target ecx))
888 (:arg-types unsigned-num signed-num)
889 (:results (result :scs (unsigned-reg) :from (:argument 0)))
890 (:result-types unsigned-num)
891 (:temporary (:sc signed-reg :offset ecx-offset :from (:argument 1)) ecx)
892 (:temporary (:sc any-reg :from (:eval 0) :to (:eval 1)) zero)
894 (:guard (member :cmov *backend-subfeatures*))
899 (inst jmp :ns positive)
902 (inst shr result :cl)
904 (inst cmov :nbe result zero)
908 ;; The result-type ensures us that this shift will not overflow.
909 (inst shl result :cl)
913 ;;; Note: documentation for this function is wrong - rtfm
914 (define-vop (signed-byte-32-len)
915 (:translate integer-length)
916 (:note "inline (signed-byte 32) integer-length")
918 (:args (arg :scs (signed-reg) :target res))
919 (:arg-types signed-num)
920 (:results (res :scs (unsigned-reg)))
921 (:result-types unsigned-num)
936 (define-vop (unsigned-byte-32-len)
937 (:translate integer-length)
938 (:note "inline (unsigned-byte 32) integer-length")
940 (:args (arg :scs (unsigned-reg)))
941 (:arg-types unsigned-num)
942 (:results (res :scs (unsigned-reg)))
943 (:result-types unsigned-num)
953 (define-vop (unsigned-byte-32-count)
954 (:translate logcount)
955 (:note "inline (unsigned-byte 32) logcount")
957 (:args (arg :scs (unsigned-reg)))
958 (:arg-types unsigned-num)
959 (:results (result :scs (unsigned-reg)))
960 (:result-types positive-fixnum)
961 (:temporary (:sc unsigned-reg :from (:argument 0)) temp)
965 (inst mov temp result)
967 (inst and result #x55555555)
968 (inst and temp #x55555555)
969 (inst add result temp)
971 (inst mov temp result)
973 (inst and result #x33333333)
974 (inst and temp #x33333333)
975 (inst add result temp)
977 (inst mov temp result)
979 (inst and result #x0f0f0f0f)
980 (inst and temp #x0f0f0f0f)
981 (inst add result temp)
983 (inst mov temp result)
985 (inst and result #x00ff00ff)
986 (inst and temp #x00ff00ff)
987 (inst add result temp)
989 (inst mov temp result)
991 (inst and result #x0000ffff)
992 (inst and temp #x0000ffff)
993 (inst add result temp)))
995 ;;;; binary conditional VOPs
997 (define-vop (fast-conditional)
1002 (:policy :fast-safe))
1004 (define-vop (fast-conditional/fixnum fast-conditional)
1005 (:args (x :scs (any-reg)
1006 :load-if (not (and (sc-is x control-stack)
1007 (sc-is y any-reg))))
1008 (y :scs (any-reg control-stack)))
1009 (:arg-types tagged-num tagged-num)
1010 (:note "inline fixnum comparison"))
1012 (define-vop (fast-conditional-c/fixnum fast-conditional/fixnum)
1013 (:args (x :scs (any-reg control-stack)))
1014 (:arg-types tagged-num (:constant (signed-byte 30)))
1015 (:info target not-p y))
1017 (define-vop (fast-conditional/signed fast-conditional)
1018 (:args (x :scs (signed-reg)
1019 :load-if (not (and (sc-is x signed-stack)
1020 (sc-is y signed-reg))))
1021 (y :scs (signed-reg signed-stack)))
1022 (:arg-types signed-num signed-num)
1023 (:note "inline (signed-byte 32) comparison"))
1025 (define-vop (fast-conditional-c/signed fast-conditional/signed)
1026 (:args (x :scs (signed-reg signed-stack)))
1027 (:arg-types signed-num (:constant (signed-byte 32)))
1028 (:info target not-p y))
1030 (define-vop (fast-conditional/unsigned fast-conditional)
1031 (:args (x :scs (unsigned-reg)
1032 :load-if (not (and (sc-is x unsigned-stack)
1033 (sc-is y unsigned-reg))))
1034 (y :scs (unsigned-reg unsigned-stack)))
1035 (:arg-types unsigned-num unsigned-num)
1036 (:note "inline (unsigned-byte 32) comparison"))
1038 (define-vop (fast-conditional-c/unsigned fast-conditional/unsigned)
1039 (:args (x :scs (unsigned-reg unsigned-stack)))
1040 (:arg-types unsigned-num (:constant (unsigned-byte 32)))
1041 (:info target not-p y))
1044 (macrolet ((define-conditional-vop (tran cond unsigned not-cond not-unsigned)
1047 (lambda (suffix cost signed)
1048 `(define-vop (;; FIXME: These could be done more
1049 ;; cleanly with SYMBOLICATE.
1050 ,(intern (format nil "~:@(FAST-IF-~A~A~)"
1053 (format nil "~:@(FAST-CONDITIONAL~A~)"
1058 ,(if (eq suffix '-c/fixnum)
1069 '(/fixnum -c/fixnum /signed -c/signed /unsigned -c/unsigned)
1071 '(t t t t nil nil)))))
1073 (define-conditional-vop < :l :b :ge :ae)
1074 (define-conditional-vop > :g :a :le :be))
1076 (define-vop (fast-if-eql/signed fast-conditional/signed)
1080 (inst jmp (if not-p :ne :e) target)))
1082 (define-vop (fast-if-eql-c/signed fast-conditional-c/signed)
1085 (cond ((and (sc-is x signed-reg) (zerop y))
1086 (inst test x x)) ; smaller instruction
1089 (inst jmp (if not-p :ne :e) target)))
1091 (define-vop (fast-if-eql/unsigned fast-conditional/unsigned)
1095 (inst jmp (if not-p :ne :e) target)))
1097 (define-vop (fast-if-eql-c/unsigned fast-conditional-c/unsigned)
1100 (cond ((and (sc-is x unsigned-reg) (zerop y))
1101 (inst test x x)) ; smaller instruction
1104 (inst jmp (if not-p :ne :e) target)))
1106 ;;; EQL/FIXNUM is funny because the first arg can be of any type, not just a
1109 ;;; These versions specify a fixnum restriction on their first arg. We have
1110 ;;; also generic-eql/fixnum VOPs which are the same, but have no restriction on
1111 ;;; the first arg and a higher cost. The reason for doing this is to prevent
1112 ;;; fixnum specific operations from being used on word integers, spuriously
1113 ;;; consing the argument.
1115 (define-vop (fast-eql/fixnum fast-conditional)
1116 (:args (x :scs (any-reg)
1117 :load-if (not (and (sc-is x control-stack)
1118 (sc-is y any-reg))))
1119 (y :scs (any-reg control-stack)))
1120 (:arg-types tagged-num tagged-num)
1121 (:note "inline fixnum comparison")
1125 (inst jmp (if not-p :ne :e) target)))
1126 (define-vop (generic-eql/fixnum fast-eql/fixnum)
1127 (:args (x :scs (any-reg descriptor-reg)
1128 :load-if (not (and (sc-is x control-stack)
1129 (sc-is y any-reg))))
1130 (y :scs (any-reg control-stack)))
1131 (:arg-types * tagged-num)
1134 (define-vop (fast-eql-c/fixnum fast-conditional/fixnum)
1135 (:args (x :scs (any-reg control-stack)))
1136 (:arg-types tagged-num (:constant (signed-byte 30)))
1137 (:info target not-p y)
1140 (cond ((and (sc-is x any-reg) (zerop y))
1141 (inst test x x)) ; smaller instruction
1143 (inst cmp x (fixnumize y))))
1144 (inst jmp (if not-p :ne :e) target)))
1145 (define-vop (generic-eql-c/fixnum fast-eql-c/fixnum)
1146 (:args (x :scs (any-reg descriptor-reg control-stack)))
1147 (:arg-types * (:constant (signed-byte 30)))
1150 ;;;; 32-bit logical operations
1152 (define-vop (merge-bits)
1153 (:translate merge-bits)
1154 (:args (shift :scs (signed-reg unsigned-reg) :target ecx)
1155 (prev :scs (unsigned-reg) :target result)
1156 (next :scs (unsigned-reg)))
1157 (:arg-types tagged-num unsigned-num unsigned-num)
1158 (:temporary (:sc signed-reg :offset ecx-offset :from (:argument 0)) ecx)
1159 (:results (result :scs (unsigned-reg) :from (:argument 1)))
1160 (:result-types unsigned-num)
1161 (:policy :fast-safe)
1165 (inst shrd result next :cl)))
1167 ;;; Only the lower 5 bits of the shift amount are significant.
1168 (define-vop (shift-towards-someplace)
1169 (:policy :fast-safe)
1170 (:args (num :scs (unsigned-reg) :target r)
1171 (amount :scs (signed-reg) :target ecx))
1172 (:arg-types unsigned-num tagged-num)
1173 (:temporary (:sc signed-reg :offset ecx-offset :from (:argument 1)) ecx)
1174 (:results (r :scs (unsigned-reg) :from (:argument 0)))
1175 (:result-types unsigned-num))
1177 (define-vop (shift-towards-start shift-towards-someplace)
1178 (:translate shift-towards-start)
1179 (:note "SHIFT-TOWARDS-START")
1185 (define-vop (shift-towards-end shift-towards-someplace)
1186 (:translate shift-towards-end)
1187 (:note "SHIFT-TOWARDS-END")
1193 ;;;; Modular functions
1195 (define-modular-fun +-mod32 (x y) + 32)
1196 (define-vop (fast-+-mod32/unsigned=>unsigned fast-+/unsigned=>unsigned)
1197 (:translate +-mod32))
1198 (define-vop (fast-+-mod32-c/unsigned=>unsigned fast-+-c/unsigned=>unsigned)
1199 (:translate +-mod32))
1200 (define-modular-fun --mod32 (x y) - 32)
1201 (define-vop (fast---mod32/unsigned=>unsigned fast--/unsigned=>unsigned)
1202 (:translate --mod32))
1203 (define-vop (fast---mod32-c/unsigned=>unsigned fast---c/unsigned=>unsigned)
1204 (:translate --mod32))
1206 (define-modular-fun *-mod32 (x y) * 32)
1207 (define-vop (fast-*-mod32/unsigned=>unsigned fast-*/unsigned=>unsigned)
1208 (:translate *-mod32))
1209 ;;; (no -C variant as x86 MUL instruction doesn't take an immediate)
1211 (define-vop (fast-ash-left-mod32-c/unsigned=>unsigned
1212 fast-ash-c/unsigned=>unsigned)
1213 (:translate ash-left-mod32))
1215 (define-vop (fast-ash-left-mod32/unsigned=>unsigned
1216 fast-ash-left/unsigned=>unsigned))
1217 (deftransform ash-left-mod32 ((integer count)
1218 ((unsigned-byte 32) (unsigned-byte 5)))
1219 (when (sb!c::constant-lvar-p count)
1220 (sb!c::give-up-ir1-transform))
1221 '(%primitive fast-ash-left-mod32/unsigned=>unsigned integer count))
1225 (defknown sb!vm::%lea-mod32 (integer integer (member 1 2 4 8) (signed-byte 32))
1227 (foldable flushable movable))
1229 (define-modular-fun-optimizer %lea ((base index scale disp) :width width)
1230 (when (and (<= width 32)
1231 (constant-lvar-p scale)
1232 (constant-lvar-p disp))
1233 (cut-to-width base width)
1234 (cut-to-width index width)
1235 'sb!vm::%lea-mod32))
1238 (defun sb!vm::%lea-mod32 (base index scale disp)
1239 (ldb (byte 32 0) (%lea base index scale disp)))
1241 (defun sb!vm::%lea-mod32 (base index scale disp)
1242 (let ((base (logand base #xffffffff))
1243 (index (logand index #xffffffff)))
1244 ;; can't use modular version of %LEA, as we only have VOPs for
1245 ;; constant SCALE and DISP.
1246 (ldb (byte 32 0) (+ base (* index scale) disp))))
1248 (in-package "SB!VM")
1250 (define-vop (%lea-mod32/unsigned=>unsigned
1251 %lea/unsigned=>unsigned)
1252 (:translate %lea-mod32))
1254 ;;; logical operations
1255 (define-modular-fun lognot-mod32 (x) lognot 32)
1256 (define-vop (lognot-mod32/unsigned=>unsigned)
1257 (:translate lognot-mod32)
1258 (:args (x :scs (unsigned-reg unsigned-stack) :target r
1259 :load-if (not (and (sc-is x unsigned-stack)
1260 (sc-is r unsigned-stack)
1262 (:arg-types unsigned-num)
1263 (:results (r :scs (unsigned-reg)
1264 :load-if (not (and (sc-is x unsigned-stack)
1265 (sc-is r unsigned-stack)
1267 (:result-types unsigned-num)
1268 (:policy :fast-safe)
1273 (define-modular-fun logxor-mod32 (x y) logxor 32)
1274 (define-vop (fast-logxor-mod32/unsigned=>unsigned
1275 fast-logxor/unsigned=>unsigned)
1276 (:translate logxor-mod32))
1277 (define-vop (fast-logxor-mod32-c/unsigned=>unsigned
1278 fast-logxor-c/unsigned=>unsigned)
1279 (:translate logxor-mod32))
1281 (define-source-transform logeqv (&rest args)
1282 (if (oddp (length args))
1284 `(lognot (logxor ,@args))))
1285 (define-source-transform logandc1 (x y)
1286 `(logand (lognot ,x) ,y))
1287 (define-source-transform logandc2 (x y)
1288 `(logand ,x (lognot ,y)))
1289 (define-source-transform logorc1 (x y)
1290 `(logior (lognot ,x) ,y))
1291 (define-source-transform logorc2 (x y)
1292 `(logior ,x (lognot ,y)))
1293 (define-source-transform lognor (x y)
1294 `(lognot (logior ,x ,y)))
1295 (define-source-transform lognand (x y)
1296 `(lognot (logand ,x ,y)))
1300 (define-vop (bignum-length get-header-data)
1301 (:translate sb!bignum:%bignum-length)
1302 (:policy :fast-safe))
1304 (define-vop (bignum-set-length set-header-data)
1305 (:translate sb!bignum:%bignum-set-length)
1306 (:policy :fast-safe))
1308 (define-full-reffer bignum-ref * bignum-digits-offset other-pointer-lowtag
1309 (unsigned-reg) unsigned-num sb!bignum:%bignum-ref)
1311 (define-full-setter bignum-set * bignum-digits-offset other-pointer-lowtag
1312 (unsigned-reg) unsigned-num sb!bignum:%bignum-set)
1314 (define-vop (digit-0-or-plus)
1315 (:translate sb!bignum:%digit-0-or-plusp)
1316 (:policy :fast-safe)
1317 (:args (digit :scs (unsigned-reg)))
1318 (:arg-types unsigned-num)
1320 (:info target not-p)
1322 (inst or digit digit)
1323 (inst jmp (if not-p :s :ns) target)))
1326 ;;; For add and sub with carry the sc of carry argument is any-reg so
1327 ;;; the it may be passed as a fixnum or word and thus may be 0, 1, or
1328 ;;; 4. This is easy to deal with and may save a fixnum-word
1330 (define-vop (add-w/carry)
1331 (:translate sb!bignum:%add-with-carry)
1332 (:policy :fast-safe)
1333 (:args (a :scs (unsigned-reg) :target result)
1334 (b :scs (unsigned-reg unsigned-stack) :to :eval)
1335 (c :scs (any-reg) :target temp))
1336 (:arg-types unsigned-num unsigned-num positive-fixnum)
1337 (:temporary (:sc any-reg :from (:argument 2) :to :eval) temp)
1338 (:results (result :scs (unsigned-reg) :from (:argument 0))
1339 (carry :scs (unsigned-reg)))
1340 (:result-types unsigned-num positive-fixnum)
1344 (inst neg temp) ; Set the carry flag to 0 if c=0 else to 1
1347 (inst adc carry carry)))
1349 ;;; Note: the borrow is the oppostite of the x86 convention - 1 for no
1350 ;;; borrow and 0 for a borrow.
1351 (define-vop (sub-w/borrow)
1352 (:translate sb!bignum:%subtract-with-borrow)
1353 (:policy :fast-safe)
1354 (:args (a :scs (unsigned-reg) :to :eval :target result)
1355 (b :scs (unsigned-reg unsigned-stack) :to :result)
1356 (c :scs (any-reg control-stack)))
1357 (:arg-types unsigned-num unsigned-num positive-fixnum)
1358 (:results (result :scs (unsigned-reg) :from :eval)
1359 (borrow :scs (unsigned-reg)))
1360 (:result-types unsigned-num positive-fixnum)
1362 (inst cmp c 1) ; Set the carry flag to 1 if c=0 else to 0
1366 (inst adc borrow borrow)
1367 (inst xor borrow 1)))
1370 (define-vop (bignum-mult-and-add-3-arg)
1371 (:translate sb!bignum:%multiply-and-add)
1372 (:policy :fast-safe)
1373 (:args (x :scs (unsigned-reg) :target eax)
1374 (y :scs (unsigned-reg unsigned-stack))
1375 (carry-in :scs (unsigned-reg unsigned-stack)))
1376 (:arg-types unsigned-num unsigned-num unsigned-num)
1377 (:temporary (:sc unsigned-reg :offset eax-offset :from (:argument 0)
1378 :to (:result 1) :target lo) eax)
1379 (:temporary (:sc unsigned-reg :offset edx-offset :from (:argument 1)
1380 :to (:result 0) :target hi) edx)
1381 (:results (hi :scs (unsigned-reg))
1382 (lo :scs (unsigned-reg)))
1383 (:result-types unsigned-num unsigned-num)
1387 (inst add eax carry-in)
1392 (define-vop (bignum-mult-and-add-4-arg)
1393 (:translate sb!bignum:%multiply-and-add)
1394 (:policy :fast-safe)
1395 (:args (x :scs (unsigned-reg) :target eax)
1396 (y :scs (unsigned-reg unsigned-stack))
1397 (prev :scs (unsigned-reg unsigned-stack))
1398 (carry-in :scs (unsigned-reg unsigned-stack)))
1399 (:arg-types unsigned-num unsigned-num unsigned-num unsigned-num)
1400 (:temporary (:sc unsigned-reg :offset eax-offset :from (:argument 0)
1401 :to (:result 1) :target lo) eax)
1402 (:temporary (:sc unsigned-reg :offset edx-offset :from (:argument 1)
1403 :to (:result 0) :target hi) edx)
1404 (:results (hi :scs (unsigned-reg))
1405 (lo :scs (unsigned-reg)))
1406 (:result-types unsigned-num unsigned-num)
1412 (inst add eax carry-in)
1418 (define-vop (bignum-mult)
1419 (:translate sb!bignum:%multiply)
1420 (:policy :fast-safe)
1421 (:args (x :scs (unsigned-reg) :target eax)
1422 (y :scs (unsigned-reg unsigned-stack)))
1423 (:arg-types unsigned-num unsigned-num)
1424 (:temporary (:sc unsigned-reg :offset eax-offset :from (:argument 0)
1425 :to (:result 1) :target lo) eax)
1426 (:temporary (:sc unsigned-reg :offset edx-offset :from (:argument 1)
1427 :to (:result 0) :target hi) edx)
1428 (:results (hi :scs (unsigned-reg))
1429 (lo :scs (unsigned-reg)))
1430 (:result-types unsigned-num unsigned-num)
1437 (define-vop (bignum-lognot lognot-mod32/unsigned=>unsigned)
1438 (:translate sb!bignum:%lognot))
1440 (define-vop (fixnum-to-digit)
1441 (:translate sb!bignum:%fixnum-to-digit)
1442 (:policy :fast-safe)
1443 (:args (fixnum :scs (any-reg control-stack) :target digit))
1444 (:arg-types tagged-num)
1445 (:results (digit :scs (unsigned-reg)
1446 :load-if (not (and (sc-is fixnum control-stack)
1447 (sc-is digit unsigned-stack)
1448 (location= fixnum digit)))))
1449 (:result-types unsigned-num)
1452 (inst sar digit 2)))
1454 (define-vop (bignum-floor)
1455 (:translate sb!bignum:%floor)
1456 (:policy :fast-safe)
1457 (:args (div-high :scs (unsigned-reg) :target edx)
1458 (div-low :scs (unsigned-reg) :target eax)
1459 (divisor :scs (unsigned-reg unsigned-stack)))
1460 (:arg-types unsigned-num unsigned-num unsigned-num)
1461 (:temporary (:sc unsigned-reg :offset eax-offset :from (:argument 1)
1462 :to (:result 0) :target quo) eax)
1463 (:temporary (:sc unsigned-reg :offset edx-offset :from (:argument 0)
1464 :to (:result 1) :target rem) edx)
1465 (:results (quo :scs (unsigned-reg))
1466 (rem :scs (unsigned-reg)))
1467 (:result-types unsigned-num unsigned-num)
1471 (inst div eax divisor)
1475 (define-vop (signify-digit)
1476 (:translate sb!bignum:%fixnum-digit-with-correct-sign)
1477 (:policy :fast-safe)
1478 (:args (digit :scs (unsigned-reg unsigned-stack) :target res))
1479 (:arg-types unsigned-num)
1480 (:results (res :scs (any-reg signed-reg)
1481 :load-if (not (and (sc-is digit unsigned-stack)
1482 (sc-is res control-stack signed-stack)
1483 (location= digit res)))))
1484 (:result-types signed-num)
1487 (when (sc-is res any-reg control-stack)
1490 (define-vop (digit-ashr)
1491 (:translate sb!bignum:%ashr)
1492 (:policy :fast-safe)
1493 (:args (digit :scs (unsigned-reg unsigned-stack) :target result)
1494 (count :scs (unsigned-reg) :target ecx))
1495 (:arg-types unsigned-num positive-fixnum)
1496 (:temporary (:sc unsigned-reg :offset ecx-offset :from (:argument 1)) ecx)
1497 (:results (result :scs (unsigned-reg) :from (:argument 0)
1498 :load-if (not (and (sc-is result unsigned-stack)
1499 (location= digit result)))))
1500 (:result-types unsigned-num)
1504 (inst sar result :cl)))
1506 (define-vop (digit-lshr digit-ashr)
1507 (:translate sb!bignum:%digit-logical-shift-right)
1511 (inst shr result :cl)))
1513 (define-vop (digit-ashl digit-ashr)
1514 (:translate sb!bignum:%ashl)
1518 (inst shl result :cl)))
1520 ;;;; static functions
1522 (define-static-fun two-arg-/ (x y) :translate /)
1524 (define-static-fun two-arg-gcd (x y) :translate gcd)
1525 (define-static-fun two-arg-lcm (x y) :translate lcm)
1527 (define-static-fun two-arg-and (x y) :translate logand)
1528 (define-static-fun two-arg-ior (x y) :translate logior)
1529 (define-static-fun two-arg-xor (x y) :translate logxor)
1532 ;;; Support for the Mersenne Twister, MT19937, random number generator
1533 ;;; due to Matsumoto and Nishimura.
1535 ;;; Makoto Matsumoto and T. Nishimura, "Mersenne twister: A
1536 ;;; 623-dimensionally equidistributed uniform pseudorandom number
1537 ;;; generator.", ACM Transactions on Modeling and Computer Simulation,
1538 ;;; 1997, to appear.
1541 ;;; 0-1: Constant matrix A. [0, #x9908b0df] (not used here)
1542 ;;; 2: Index; init. to 1.
1544 (defknown random-mt19937 ((simple-array (unsigned-byte 32) (*)))
1545 (unsigned-byte 32) ())
1546 (define-vop (random-mt19937)
1547 (:policy :fast-safe)
1548 (:translate random-mt19937)
1549 (:args (state :scs (descriptor-reg) :to :result))
1550 (:arg-types simple-array-unsigned-byte-32)
1551 (:temporary (:sc unsigned-reg :from (:eval 0) :to :result) k)
1552 (:temporary (:sc unsigned-reg :offset eax-offset
1553 :from (:eval 0) :to :result) tmp)
1554 (:results (y :scs (unsigned-reg) :from (:eval 0)))
1555 (:result-types unsigned-num)
1557 (inst mov k (make-ea :dword :base state
1558 :disp (- (* (+ 2 vector-data-offset)
1560 other-pointer-lowtag)))
1562 (inst jmp :ne no-update)
1563 (inst mov tmp state) ; The state is passed in EAX.
1564 (inst call (make-fixup 'random-mt19937-update :assembly-routine))
1565 ;; Restore k, and set to 0.
1569 (inst mov y (make-ea :dword :base state :index k :scale 4
1570 :disp (- (* (+ 3 vector-data-offset)
1572 other-pointer-lowtag)))
1575 (inst xor y (make-ea :dword :base state :index k :scale 4
1576 :disp (- (* (+ 3 vector-data-offset)
1578 other-pointer-lowtag)))
1579 ;; y ^= (y << 7) & #x9d2c5680
1583 (inst mov (make-ea :dword :base state
1584 :disp (- (* (+ 2 vector-data-offset)
1586 other-pointer-lowtag))
1588 (inst and tmp #x9d2c5680)
1590 ;; y ^= (y << 15) & #xefc60000
1593 (inst and tmp #xefc60000)
1602 ;;; This is essentially a straight implementation of the algorithm in
1603 ;;; "Strength Reduction of Multiplications by Integer Constants",
1604 ;;; Youfeng Wu, ACM SIGPLAN Notices, Vol. 30, No.2, February 1995.
1605 (defun basic-decompose-multiplication (arg num n-bits condensed)
1606 (case (aref condensed 0)
1608 (let ((tmp (min 3 (aref condensed 1))))
1609 (decf (aref condensed 1) tmp)
1612 ,(decompose-multiplication
1613 arg (ash (1- num) (- tmp)) (1- n-bits) (subseq condensed 1))
1616 (let ((r0 (aref condensed 0)))
1617 (incf (aref condensed 1) r0)
1619 (%lea ,(decompose-multiplication
1620 arg (- num (ash 1 r0)) (1- n-bits) (subseq condensed 1))
1623 (t (let ((r0 (aref condensed 0)))
1624 (setf (aref condensed 0) 0)
1626 (ash ,(decompose-multiplication
1627 arg (ash num (- r0)) n-bits condensed)
1630 (defun decompose-multiplication (arg num n-bits condensed)
1635 `(logand #xffffffff (ash ,arg ,(1- (integer-length num)))))
1636 ((let ((max 0) (end 0))
1637 (loop for i from 2 to (length condensed)
1638 for j = (reduce #'+ (subseq condensed 0 i))
1639 when (and (> (- (* 2 i) 3 j) max)
1640 (< (+ (ash 1 (1+ j))
1641 (ash (ldb (byte (- 32 (1+ j)) (1+ j)) num)
1644 do (setq max (- (* 2 i) 3 j)
1647 (let ((j (reduce #'+ (subseq condensed 0 end))))
1648 (let ((n2 (+ (ash 1 (1+ j))
1649 (ash (ldb (byte (- 32 (1+ j)) (1+ j)) num) (1+ j))))
1650 (n1 (1+ (ldb (byte (1+ j) 0) (lognot num)))))
1652 (- ,(optimize-multiply arg n2) ,(optimize-multiply arg n1))))))))
1653 ((dolist (i '(9 5 3))
1654 (when (integerp (/ num i))
1655 (when (< (logcount (/ num i)) (logcount num))
1657 (return `(let ((,x ,(optimize-multiply arg (/ num i))))
1659 (%lea ,x ,x (1- ,i) 0)))))))))
1660 (t (basic-decompose-multiplication arg num n-bits condensed))))
1662 (defun optimize-multiply (arg x)
1663 (let* ((n-bits (logcount x))
1664 (condensed (make-array n-bits)))
1665 (let ((count 0) (bit 0))
1667 (cond ((logbitp i x)
1668 (setf (aref condensed bit) count)
1672 (decompose-multiplication arg x n-bits condensed)))
1674 (defun *-transformer (y)
1676 ((= y (ash 1 (integer-length y)))
1677 ;; there's a generic transform for y = 2^k
1678 (give-up-ir1-transform))
1679 ((member y '(3 5 9))
1680 ;; we can do these multiplications directly using LEA
1681 `(%lea x x ,(1- y) 0))
1682 ((member :pentium4 *backend-subfeatures*)
1683 ;; the pentium4's multiply unit is reportedly very good
1684 (give-up-ir1-transform))
1685 ;; FIXME: should make this more fine-grained. If nothing else,
1686 ;; there should probably be a cutoff of about 9 instructions on
1687 ;; pentium-class machines.
1688 (t (optimize-multiply 'x y))))
1690 (deftransform * ((x y)
1691 ((unsigned-byte 32) (constant-arg (unsigned-byte 32)))
1693 "recode as leas, shifts and adds"
1694 (let ((y (lvar-value y)))
1697 (deftransform sb!vm::*-mod32
1698 ((x y) ((unsigned-byte 32) (constant-arg (unsigned-byte 32)))
1700 "recode as leas, shifts and adds"
1701 (let ((y (lvar-value y)))
1704 ;;; FIXME: we should also be able to write an optimizer or two to
1705 ;;; convert (+ (* x 2) 17), (- (* x 9) 5) to a %LEA.