1 ;;;; the VM definition arithmetic VOPs for the PPC
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.
14 ;;;; Unary operations.
16 (define-vop (fast-safe-arith-op)
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
))
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
))
35 (define-vop (fast-negate/fixnum fixnum-unop
)
40 (define-vop (fast-negate/signed signed-unop
)
45 (define-vop (fast-lognot/fixnum fixnum-unop
)
48 (inst subfic res x
(fixnumize -
1))))
50 (define-vop (fast-lognot/signed signed-unop
)
55 ;;;; Binary fixnum operations.
57 ;;; Assume that any constant operand is the second arg...
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"))
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"))
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"))
83 (define-vop (fast-fixnum-binop-c fast-safe-arith-op
)
84 (:args
(x :target r
:scs
(any-reg zero
)))
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"))
92 (define-vop (fast-fixnum-binop30-c fast-safe-arith-op
)
93 (:args
(x :target r
:scs
(any-reg zero
)))
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"))
101 (define-vop (fast-fixnum-logop-c fast-safe-arith-op
)
102 (:args
(x :target r
:scs
(any-reg zero
)))
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"))
110 (define-vop (fast-fixnum-logop30-c fast-safe-arith-op
)
111 (:args
(x :target r
:scs
(any-reg zero
)))
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"))
119 (define-vop (fast-unsigned-binop-c fast-safe-arith-op
)
120 (:args
(x :target r
:scs
(unsigned-reg zero
)))
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"))
128 (define-vop (fast-unsigned-binop32-c fast-safe-arith-op
)
129 (:args
(x :target r
:scs
(unsigned-reg zero
)))
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"))
137 (define-vop (fast-signed-binop32-c fast-safe-arith-op
)
138 (:args
(x :target r
:scs
(signed-reg zero
)))
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"))
146 (define-vop (fast-unsigned-logop-c fast-safe-arith-op
)
147 (:args
(x :target r
:scs
(unsigned-reg zero
)))
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"))
155 (define-vop (fast-unsigned-logop32-c fast-safe-arith-op
)
156 (:args
(x :target r
:scs
(unsigned-reg zero
)))
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"))
164 (define-vop (fast-signed-logop32-c fast-safe-arith-op
)
165 (:args
(x :target r
:scs
(signed-reg zero
)))
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"))
173 (define-vop (fast-signed-binop-c fast-safe-arith-op
)
174 (:args
(x :target r
:scs
(signed-reg zero
)))
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"))
182 (define-vop (fast-signed-logop-c fast-safe-arith-op
)
183 (:args
(x :target r
:scs
(signed-reg zero
)))
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"))
191 (eval-when (:compile-toplevel
:load-toplevel
:execute
)
193 (defmacro !define-var-binop
(translate untagged-penalty op
194 &optional arg-swap restore-fixnum-mask
)
196 (define-vop (,(symbolicate "FAST-" translate
"/FIXNUM=>FIXNUM")
198 ,@(when restore-fixnum-mask
199 `((:temporary
(:sc non-descriptor-reg
) temp
)))
200 (:translate
,translate
)
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")
211 (:translate
,translate
)
212 (:generator
,(1+ untagged-penalty
)
216 (define-vop (,(symbolicate "FAST-" translate
"/UNSIGNED=>UNSIGNED")
218 (:translate
,translate
)
219 (:generator
,(1+ untagged-penalty
)
222 `(inst ,op r x y
))))))
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
))
229 (define-vop (,(symbolicate 'fast- translate
'-c
/fixnum
=>fixnum
)
231 'fast-fixnum-binop30-c
232 'fast-fixnum-binop-c
))
233 (:translate
,translate
)
235 `((:temporary
(:sc any-reg
:target r
) temp
)))
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.
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
))
250 (inst ,shifted-op r x
(if (logbitp 15 high-half
)
251 (dpb high-half
(byte 16 0) -
1)
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
)
261 (dpb top
(byte 16 0) -
1)
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
)
268 'fast-signed-binop32-c
269 'fast-signed-binop-c
))
270 (:translate
,translate
)
272 `((:temporary
(:sc non-descriptor-reg
:target r
) temp
)))
273 (:generator
,untagged-penalty
275 `(let ((high-half (ldb (byte 16 16) y
))
276 (low-half (ldb (byte 16 0) y
)))
277 ;; Compare %LR in insts.lisp.
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
))
286 (inst ,shifted-op r x
(if (logbitp 15 high-half
)
287 (dpb high-half
(byte 16 0) -
1)
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
)
297 (dpb top
(byte 16 0) -
1)
299 (inst ,shifted-op temp x high-half
)
300 (inst ,op r temp low-half
)))))
302 (define-vop (,(symbolicate 'fast- translate
'-c
/unsigned
=>unsigned
)
304 'fast-unsigned-binop32-c
305 'fast-unsigned-binop-c
))
306 (:translate
,translate
)
308 `((:temporary
(:sc non-descriptor-reg
:target r
) temp
)))
309 (:generator
,untagged-penalty
311 `(let ((high-half (ldb (byte 16 16) y
))
312 (low-half (ldb (byte 16 0) y
)))
313 ;; Compare %LR in insts.lisp.
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
))
322 (inst ,shifted-op r x
(if (logbitp 15 high-half
)
323 (dpb high-half
(byte 16 0) -
1)
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
)
333 (dpb top
(byte 16 0) -
1)
335 (inst ,shifted-op temp x high-half
)
336 (inst ,op r temp low-half
)))))
337 `(inst ,op r x y
))))))
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
))
343 (define-vop (,(symbolicate 'fast- translate
'-c
/fixnum
=>fixnum
)
345 'fast-fixnum-logop30-c
346 'fast-fixnum-logop-c
))
347 (:translate
,translate
)
349 `((:temporary
(:sc any-reg
:target r
) temp
)))
352 `(let* ((y (fixnumize y
))
353 (high-half (ldb (byte 16 16) y
))
354 (low-half (ldb (byte 16 0) y
)))
356 ((zerop high-half
) (inst ,op r x low-half
))
357 ((zerop low-half
) (inst ,shifted-op r x high-half
))
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
)
364 'fast-signed-logop32-c
365 'fast-signed-logop-c
))
366 (:translate
,translate
)
368 `((:temporary
(:sc non-descriptor-reg
:target r
) temp
)))
369 (:generator
,untagged-penalty
371 `(let ((high-half (ldb (byte 16 16) y
))
372 (low-half (ldb (byte 16 0) y
)))
374 ((zerop high-half
) (inst ,op r x low-half
))
375 ((zerop low-half
) (inst ,shifted-op r x high-half
))
377 (inst ,shifted-op temp x high-half
)
378 (inst ,op r temp low-half
))))
380 (define-vop (,(symbolicate 'fast- translate
'-c
/unsigned
=>unsigned
)
382 'fast-unsigned-logop32-c
383 'fast-unsigned-logop-c
))
384 (:translate
,translate
)
386 `((:temporary
(:sc non-descriptor-reg
:target r
) temp
)))
387 (:generator
,untagged-penalty
389 `(let ((high-half (ldb (byte 16 16) y
))
390 (low-half (ldb (byte 16 0) y
)))
392 ((zerop high-half
) (inst ,op r x low-half
))
393 ((zerop low-half
) (inst ,shifted-op r x high-half
))
395 (inst ,shifted-op temp x high-half
)
396 (inst ,op r temp low-half
))))
397 `(inst ,op r x y
))))))
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
)
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
)
426 (define-vop (fast-*/fixnum
=>fixnum fast-fixnum-binop
)
427 (:temporary
(:scs
(non-descriptor-reg)) temp
)
430 (inst srawi temp y n-fixnum-tag-bits
)
431 (inst mullw r x temp
)))
433 (define-vop (fast-*-c
/fixnum
=>fixnum fast-fixnum-binop-c
)
435 (:arg-types tagged-num
436 (:constant
(and (signed-byte 16) (not (integer 0 0)))))
440 (define-vop (fast-*-bigc
/fixnum
=>fixnum fast-fixnum-binop-c
)
442 (:arg-types tagged-num
443 (:constant
(and fixnum
(not (signed-byte 16)))))
444 (:temporary
(:scs
(non-descriptor-reg)) temp
)
447 (inst mullw r x temp
)))
449 (define-vop (fast-*/signed
=>signed fast-signed-binop
)
454 (define-vop (fast-*-c
/signed
=>signed fast-signed-binop-c
)
459 (define-vop (fast-*/unsigned
=>unsigned fast-unsigned-binop
)
464 (define-vop (fast-*-c
/unsigned
=>unsigned fast-unsigned-binop-c
)
471 (macrolet ((def (name sc-type type result-type cost
)
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
)
483 ((signed-reg unsigned-reg
)
484 (inst slw result number amount
))
486 (let ((amount (tn-value amount
)))
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))
495 (define-vop (fast-ash/unsigned
=>unsigned
)
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
)
504 (:temporary
(:sc non-descriptor-reg
) ndesc
)
506 (let ((positive (gen-label))
508 (inst cmpwi amount
0)
509 (inst neg ndesc amount
)
511 (inst cmpwi ndesc
31)
512 (inst srw result number ndesc
)
514 (move result zero-tn
)
517 (emit-label positive
)
518 ;; The result-type assures us that this shift will not overflow.
519 (inst slw result number amount
)
523 (define-vop (fast-ash-c/unsigned
=>unsigned
)
524 (:note
"inline constant ASH")
525 (:args
(number :scs
(unsigned-reg)))
527 (:arg-types unsigned-num
(:constant integer
))
528 (:results
(result :scs
(unsigned-reg)))
529 (:result-types unsigned-num
)
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
)))))
540 (define-vop (fast-ash/signed
=>signed
)
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
))
549 (:temporary
(:sc non-descriptor-reg
) ndesc
)
553 (let ((positive (gen-label))
555 (inst cmpwi amount
0)
556 (inst neg ndesc amount
)
558 (inst cmpwi ndesc
31)
559 (inst sraw result number ndesc
)
561 (inst srawi result number
31)
564 (emit-label positive
)
565 ;; The result-type assures us that this shift will not overflow.
566 (inst slw result number amount
)
571 (let ((amount (tn-value amount
)))
573 (let ((amount (min 31 (- amount
))))
574 (inst srawi result number amount
))
575 (inst slwi result number amount
)))))))
577 (define-vop (signed-byte-32-len)
578 (:translate integer-length
)
579 (:note
"inline (signed-byte 32) integer-length")
581 (:args
(arg :scs
(signed-reg)))
582 (:arg-types signed-num
)
583 (:results
(res :scs
(unsigned-reg) :from
:load
))
584 (:result-types unsigned-num
)
586 ; (integer-length arg) = (- 32 (cntlz (if (>= arg 0) arg (lognot arg))))
587 (let ((nonneg (gen-label)))
588 (inst cntlzw. res arg
)
591 (inst cntlzw res res
)
593 (inst subfic res res
32))))
595 (define-vop (unsigned-byte-32-len)
596 (:translate integer-length
)
597 (:note
"inline (unsigned-byte 32) integer-length")
599 (:args
(arg :scs
(unsigned-reg)))
600 (:arg-types unsigned-num
)
601 (:results
(res :scs
(unsigned-reg)))
602 (:result-types unsigned-num
)
604 (inst cntlzw res arg
)
605 (inst subfic res res
32)))
607 (define-vop (unsigned-byte-32-count)
608 (:translate logcount
)
609 (:note
"inline (unsigned-byte 32) logcount")
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
)
617 (let ((loop (gen-label))
619 (inst add. shift zero-tn arg
)
624 (inst subi temp shift
1)
625 (inst and. shift shift temp
)
626 (inst addi res res
(fixnumize 1))
634 (defknown %%ldb
(integer unsigned-byte unsigned-byte
) unsigned-byte
635 (movable foldable flushable always-translatable
))
637 ;;; only for constant folding within the compiler
638 (defun %%ldb
(integer size posn
)
639 (%ldb size posn integer
))
641 (define-vop (ldb-c/fixnum
)
643 (:args
(x :scs
(any-reg)))
644 (:arg-types tagged-num
(:constant
(integer 1 29)) (:constant
(integer 0 29)))
646 (:results
(res :scs
(any-reg)))
647 (:result-types tagged-num
)
650 (let ((phantom-bits (- (+ size posn
) 30)))
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
)
658 (mod (- 32 posn
(- phantom-bits
)) 32)
659 (- 32 size n-fixnum-tag-bits
)
660 (- 31 n-fixnum-tag-bits
)))
663 (mod (- 32 posn
) 32) ; effectively rotate right
664 (- 32 size n-fixnum-tag-bits
)
665 (- 31 n-fixnum-tag-bits
)))))))
667 (define-vop (ldb-c/signed
)
669 (:args
(x :scs
(signed-reg)))
670 (:arg-types signed-num
(:constant
(integer 1 29)) (:constant
(integer 0 31)))
672 (:results
(res :scs
(any-reg)))
673 (:result-types tagged-num
)
677 (mod (- (+ 32 n-fixnum-tag-bits
) posn
) 32)
678 (- 32 size n-fixnum-tag-bits
)
679 (- 31 n-fixnum-tag-bits
))))
681 (define-vop (ldb-c/unsigned
)
683 (:args
(x :scs
(unsigned-reg)))
684 (:arg-types unsigned-num
(:constant
(integer 1 29)) (:constant
(integer 0 31)))
686 (:results
(res :scs
(any-reg)))
687 (:result-types tagged-num
)
691 (mod (- (+ 32 n-fixnum-tag-bits
) posn
) 32)
692 (- 32 size n-fixnum-tag-bits
)
693 (- 31 n-fixnum-tag-bits
))))
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
)
707 (define-vop (fast-ash-left-mod32-c/unsigned
=>unsigned
708 fast-ash-c
/unsigned
=>unsigned
)
709 (:translate ash-left-mod32
))
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
))
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
)))
727 (define-modular-fun ,mfun-name
(x y
) ,fun
:untagged nil
32)
728 (define-vop (,modvop
,vop
)
729 (:translate
,mfun-name
))
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
))
744 ;;;; Binary conditional VOPs:
746 (define-vop (fast-conditional)
751 (:policy
:fast-safe
))
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"))
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
))
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"))
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
))
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"))
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
))
786 (macrolet ((define-logtest-vops ()
788 ,@(loop for suffix in
'(/fixnum -c
/fixnum
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)
796 `(define-vop (,(symbolicate "FAST-LOGTEST" suffix
)
797 ,(symbolicate "FAST-CONDITIONAL" suffix
))
799 (:temporary
(:scs
(,sc
) :to
(:result
0)) test
)
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
)
807 `(inst and. test x y
))
808 (inst b?
(if not-p
:eq
:ne
) target
)))))))
809 (define-logtest-vops))
811 (defknown %logbitp
(integer unsigned-byte
) boolean
812 (movable foldable flushable always-translatable
))
814 ;;; only for constant folding within the compiler
815 (defun %logbitp
(integer index
)
816 (logbitp index integer
))
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
)
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
)))
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
)
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
)))
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
)
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
)))
851 (define-vop (fast-if-</fixnum fast-conditional
/fixnum
)
855 (inst b?
(if not-p
:ge
:lt
) target
)))
857 (define-vop (fast-if-<-c
/fixnum fast-conditional-c
/fixnum
)
860 (inst cmpwi x
(fixnumize y
))
861 (inst b?
(if not-p
:ge
:lt
) target
)))
863 (define-vop (fast-if-</signed fast-conditional
/signed
)
867 (inst b?
(if not-p
:ge
:lt
) target
)))
869 (define-vop (fast-if-<-c
/signed fast-conditional-c
/signed
)
873 (inst b?
(if not-p
:ge
:lt
) target
)))
875 (define-vop (fast-if-</unsigned fast-conditional
/unsigned
)
879 (inst b?
(if not-p
:ge
:lt
) target
)))
881 (define-vop (fast-if-<-c
/unsigned fast-conditional-c
/unsigned
)
885 (inst b?
(if not-p
:ge
:lt
) target
)))
887 (define-vop (fast-if->/fixnum fast-conditional
/fixnum
)
891 (inst b?
(if not-p
:le
:gt
) target
)))
893 (define-vop (fast-if->-c
/fixnum fast-conditional-c
/fixnum
)
896 (inst cmpwi x
(fixnumize y
))
897 (inst b?
(if not-p
:le
:gt
) target
)))
899 (define-vop (fast-if->/signed fast-conditional
/signed
)
903 (inst b?
(if not-p
:le
:gt
) target
)))
905 (define-vop (fast-if->-c
/signed fast-conditional-c
/signed
)
909 (inst b?
(if not-p
:le
:gt
) target
)))
911 (define-vop (fast-if->/unsigned fast-conditional
/unsigned
)
915 (inst b?
(if not-p
:le
:gt
) target
)))
917 (define-vop (fast-if->-c
/unsigned fast-conditional-c
/unsigned
)
921 (inst b?
(if not-p
:le
:gt
) target
)))
923 (define-vop (fast-if-eql/signed fast-conditional
/signed
)
927 (inst b?
(if not-p
:ne
:eq
) target
)))
929 (define-vop (fast-if-eql-c/signed fast-conditional-c
/signed
)
933 (inst b?
(if not-p
:ne
:eq
) target
)))
935 (define-vop (fast-if-eql/unsigned fast-conditional
/unsigned
)
939 (inst b?
(if not-p
:ne
:eq
) target
)))
941 (define-vop (fast-if-eql-c/unsigned fast-conditional-c
/unsigned
)
945 (inst b?
(if not-p
:ne
:eq
) target
)))
948 ;;; EQL/FIXNUM is funny because the first arg can be of any type, not just a
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.
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")
966 (inst b?
(if not-p
:ne
:eq
) target
)))
968 (define-vop (generic-eql/fixnum fast-eql
/fixnum
)
969 (:arg-types
* tagged-num
)
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
)
978 (inst cmpwi x
(fixnumize y
))
979 (inst b?
(if not-p
:ne
:eq
) target
)))
981 (define-vop (generic-eql-c/fixnum fast-eql-c
/fixnum
)
982 (:arg-types
* (:constant
(signed-byte 11)))
986 ;;;; 32-bit logical operations
988 (define-vop (shift-towards-someplace)
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
))
996 (define-vop (shift-towards-start shift-towards-someplace
)
997 (:translate shift-towards-start
)
998 (:note
"shift-towards-start")
1000 (inst rlwinm amount amount
0 27 31)
1001 (inst slw r num amount
)))
1003 (define-vop (shift-towards-end shift-towards-someplace
)
1004 (:translate shift-towards-end
)
1005 (:note
"shift-towards-end")
1007 (inst rlwinm amount amount
0 27 31)
1008 (inst srw r num amount
)))
1012 (define-vop (bignum-length get-header-data
)
1013 (:translate sb
!bignum
:%bignum-length
)
1014 (:policy
:fast-safe
))
1016 (define-vop (bignum-set-length set-header-data
)
1017 (:translate sb
!bignum
:%bignum-set-length
)
1018 (:policy
:fast-safe
))
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
))
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
))
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)))
1043 (let ((done (gen-label)))
1044 (inst cmpwi digit
0)
1045 (move result null-tn
)
1047 (load-symbol result t
)
1048 (emit-label done
))))
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))
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
)
1062 (inst addic temp c -
1)
1063 (inst adde result a b
)
1064 (inst addze carry zero-tn
)))
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))
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
)
1078 (inst addic temp c -
1)
1079 (inst sube result a b
)
1080 (inst addze borrow zero-tn
)))
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
)
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
)))
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
)
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
)))
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
)
1134 (inst mulhwu hi x y
)))
1136 #!+multiply-high-vops
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
)
1146 (inst mulhwu hi x y
)))
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
)
1160 (inst mulhwu temp x y
)
1161 (inst lr mask fixnum-tag-mask
)
1162 (inst andc hi temp mask
)))
1164 (define-vop (bignum-lognot lognot-mod32
/unsigned
=>unsigned
)
1165 (:translate sb
!bignum
:%lognot
))
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
)
1175 (inst srawi digit fixnum n-fixnum-tag-bits
)))
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.
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
))
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
)
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
)
1212 (inst not quo quo
)))
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
)
1228 (inst div quo div-high divisor
)
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
)
1242 (inst slwi res digit n-fixnum-tag-bits
))
1244 (move res digit
)))))
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
)
1256 (inst sraw result digit count
)))
1258 (define-vop (digit-lshr digit-ashr
)
1259 (:translate sb
!bignum
:%digit-logical-shift-right
)
1261 (inst srw result digit count
)))
1263 (define-vop (digit-ashl digit-ashr
)
1264 (:translate sb
!bignum
:%ashl
)
1266 (inst slw result digit count
)))
1271 (define-static-fun two-arg-gcd
(x y
) :translate gcd
)
1272 (define-static-fun two-arg-lcm
(x y
) :translate lcm
)
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
/)
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
/=)
1286 (define-static-fun %negate
(x) :translate %negate
)
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
)
1295 (deftransform * ((x y
)
1296 ((unsigned-byte 32) (constant-arg (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
)
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)))
1308 ;; a mullw instruction also has a latency of 5, plus two
1309 ;; instructions (in general) to load the immediate into a
1311 (when (> (+ adds shifts
) 6)
1312 (give-up-ir1-transform))))