1 ;;;; the x86-64 VM definition of operand loading/saving and the MOVE vop
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 (defun make-byte-tn (tn)
15 (aver (sc-is tn any-reg descriptor-reg unsigned-reg signed-reg))
16 (make-random-tn :kind :normal
17 :sc (sc-or-lose 'byte-reg)
18 :offset (tn-offset tn)))
20 (defun make-dword-tn (tn)
21 (aver (sc-is tn any-reg descriptor-reg character-reg
22 unsigned-reg signed-reg))
23 (make-random-tn :kind :normal
24 :sc (sc-or-lose 'dword-reg)
25 :offset (tn-offset tn)))
28 (let ((offset (tn-offset tn)))
29 ;; Using the 32-bit instruction accomplishes the same thing and is
31 (if (<= offset edi-offset)
32 (let ((tn (make-random-tn :kind :normal
33 :sc (sc-or-lose 'dword-reg)
38 (define-move-fun (load-immediate 1) (vop x y)
40 (any-reg descriptor-reg))
41 (let ((val (tn-value x)))
46 (inst mov y (fixnumize val))))
50 (inst mov y (logior (ash (char-code val) n-widetag-bits)
51 character-widetag))))))
53 (define-move-fun (load-number 1) (vop x y)
54 ((immediate) (signed-reg unsigned-reg))
55 (let ((val (tn-value x)))
60 (define-move-fun (load-character 1) (vop x y)
61 ((immediate) (character-reg))
62 (inst mov y (char-code (tn-value x))))
64 (define-move-fun (load-system-area-pointer 1) (vop x y)
65 ((immediate) (sap-reg))
66 (inst mov y (sap-int (tn-value x))))
68 (define-move-fun (load-constant 5) (vop x y)
69 ((constant) (descriptor-reg any-reg))
72 (define-move-fun (load-stack 5) (vop x y)
73 ((control-stack) (any-reg descriptor-reg)
74 (character-stack) (character-reg)
76 (signed-stack) (signed-reg)
77 (unsigned-stack) (unsigned-reg))
80 (define-move-fun (store-stack 5) (vop x y)
81 ((any-reg descriptor-reg) (control-stack)
82 (character-reg) (character-stack)
84 (signed-reg) (signed-stack)
85 (unsigned-reg) (unsigned-stack))
90 (:args (x :scs (any-reg descriptor-reg immediate) :target y
91 :load-if (not (location= x y))))
92 (:results (y :scs (any-reg descriptor-reg)
94 (not (or (location= x y)
95 (and (sc-is x any-reg descriptor-reg immediate)
96 (sc-is y control-stack))))))
97 (:temporary (:sc unsigned-reg) temp)
101 (if (and (sc-is x immediate)
102 (sc-is y any-reg descriptor-reg control-stack))
103 (let ((val (tn-value x)))
106 (if (and (zerop val) (sc-is y any-reg descriptor-reg))
108 (move-immediate y (fixnumize val) temp)))
110 (inst mov y (+ nil-value (static-symbol-offset val))))
112 (inst mov y (logior (ash (char-code val) n-widetag-bits)
113 character-widetag)))))
116 (define-move-vop move :move
117 (any-reg descriptor-reg immediate)
118 (any-reg descriptor-reg))
120 ;;; Make MOVE the check VOP for T so that type check generation
121 ;;; doesn't think it is a hairy type. This also allows checking of a
122 ;;; few of the values in a continuation to fall out.
123 (primitive-type-vop move (:check) t)
125 (defun move-immediate (target val &optional tmp-tn)
127 ;; If target is a register, we can just mov it there directly
129 (sc-is target signed-reg unsigned-reg descriptor-reg any-reg))
130 (inst mov target val))
131 ;; Likewise if the value is small enough.
132 ((typep val '(signed-byte 31))
133 (inst mov target val))
134 ;; Otherwise go through the temporary register
136 (inst mov tmp-tn val)
137 (inst mov target tmp-tn))
139 (error "~A is not a register, no temporary given, and immediate ~A too large" target val))))
141 ;;; The MOVE-ARG VOP is used for moving descriptor values into
142 ;;; another frame for argument or known value passing.
144 ;;; Note: It is not going to be possible to move a constant directly
145 ;;; to another frame, except if the destination is a register and in
146 ;;; this case the loading works out.
147 (define-vop (move-arg)
148 (:args (x :scs (any-reg descriptor-reg immediate) :target y
149 :load-if (not (and (sc-is y any-reg descriptor-reg)
150 (sc-is x control-stack))))
152 :load-if (not (sc-is y any-reg descriptor-reg))))
156 ((any-reg descriptor-reg)
157 (if (sc-is x immediate)
158 (let ((val (tn-value x)))
162 ((or (signed-byte 29) (unsigned-byte 29))
163 (inst mov y (fixnumize val)))
165 (move-immediate y (fixnumize val)))
169 (inst mov y (logior (ash (char-code val) n-widetag-bits)
170 character-widetag)))))
173 (if (sc-is x immediate)
174 (let ((val (tn-value x)))
175 (if (= (tn-offset fp) esp-offset)
179 (storew (fixnumize val) fp (tn-offset y)))
181 (storew (+ nil-value (static-symbol-offset val))
184 (storew (logior (ash (char-code val) n-widetag-bits)
190 (storew (fixnumize val) fp (frame-word-offset (tn-offset y))))
192 (storew (+ nil-value (static-symbol-offset val))
193 fp (frame-word-offset (tn-offset y))))
195 (storew (logior (ash (char-code val) n-widetag-bits)
197 fp (frame-word-offset (tn-offset y)))))))
198 (if (= (tn-offset fp) esp-offset)
200 (storew x fp (tn-offset y))
202 (storew x fp (frame-word-offset (tn-offset y)))))))))
204 (define-move-vop move-arg :move-arg
205 (any-reg descriptor-reg)
206 (any-reg descriptor-reg))
210 ;;; This VOP exists just to begin the lifetime of a TN that couldn't
211 ;;; be written legally due to a type error. An error is signalled
212 ;;; before this VOP is so we don't need to do anything (not that there
213 ;;; would be anything sensible to do anyway.)
214 (define-vop (illegal-move)
219 (:save-p :compute-only)
221 (error-call vop 'object-not-type-error x type)))
223 ;;;; moves and coercions
225 ;;; These MOVE-TO-WORD VOPs move a tagged integer to a raw full-word
226 ;;; representation. Similarly, the MOVE-FROM-WORD VOPs converts a raw
227 ;;; integer to a tagged bignum or fixnum.
229 ;;; Arg is a fixnum, so just shift it. We need a type restriction
230 ;;; because some possible arg SCs (control-stack) overlap with
231 ;;; possible bignum arg SCs.
232 (define-vop (move-to-word/fixnum)
233 (:args (x :scs (any-reg descriptor-reg) :target y
234 :load-if (not (location= x y))))
235 (:results (y :scs (signed-reg unsigned-reg)
236 :load-if (not (location= x y))))
237 (:arg-types tagged-num)
238 (:note "fixnum untagging")
241 (inst sar y (1- n-lowtag-bits))))
242 (define-move-vop move-to-word/fixnum :move
243 (any-reg descriptor-reg) (signed-reg unsigned-reg))
245 ;;; Arg is a non-immediate constant, load it.
246 (define-vop (move-to-word-c)
247 (:args (x :scs (constant)))
248 (:results (y :scs (signed-reg unsigned-reg)))
249 (:note "constant load")
251 (cond ((sb!c::tn-leaf x)
252 (inst mov y (tn-value x)))
255 (inst sar y n-fixnum-tag-bits)))))
256 (define-move-vop move-to-word-c :move
257 (constant) (signed-reg unsigned-reg))
260 ;;; Arg is a fixnum or bignum, figure out which and load if necessary.
261 (define-vop (move-to-word/integer)
262 (:args (x :scs (descriptor-reg) :target eax))
263 (:results (y :scs (signed-reg unsigned-reg)))
264 (:note "integer to untagged word coercion")
265 (:temporary (:sc unsigned-reg :offset eax-offset
266 :from (:argument 0) :to (:result 0) :target y) eax)
269 (inst test al-tn 7) ; a symbolic constant for this
270 (inst jmp :z FIXNUM) ; would be nice
271 (loadw y eax bignum-digits-offset other-pointer-lowtag)
274 (inst sar eax (1- n-lowtag-bits))
277 (define-move-vop move-to-word/integer :move
278 (descriptor-reg) (signed-reg unsigned-reg))
281 ;;; Result is a fixnum, so we can just shift. We need the result type
282 ;;; restriction because of the control-stack ambiguity noted above.
283 (define-vop (move-from-word/fixnum)
284 (:args (x :scs (signed-reg unsigned-reg) :target y
285 :load-if (not (location= x y))))
286 (:results (y :scs (any-reg descriptor-reg)
287 :load-if (not (location= x y))))
288 (:result-types tagged-num)
289 (:note "fixnum tagging")
291 (cond ((and (sc-is x signed-reg unsigned-reg)
292 (not (location= x y)))
293 ;; Uses 7 bytes, but faster on the Pentium
294 (inst lea y (make-ea :qword :index x :scale 8)))
296 ;; Uses: If x is a reg 2 + 3; if x = y uses only 3 bytes
298 (inst shl y (1- n-lowtag-bits))))))
299 (define-move-vop move-from-word/fixnum :move
300 (signed-reg unsigned-reg) (any-reg descriptor-reg))
302 ;;; Convert an untagged signed word to a lispobj -- fixnum or bignum
303 ;;; as the case may be. Fixnum case inline, bignum case in an assembly
305 (define-vop (move-from-signed)
306 (:args (x :scs (signed-reg unsigned-reg) :to :result))
307 (:results (y :scs (any-reg descriptor-reg) :from :argument))
308 (:note "signed word to integer coercion")
309 ;; Worst case cost to make sure people know they may be number consing.
311 (aver (not (location= x y)))
312 (let ((done (gen-label)))
313 (inst imul y x #.(ash 1 n-fixnum-tag-bits))
316 (inst lea temp-reg-tn
317 (make-ea :qword :disp
318 (make-fixup (ecase (tn-offset y)
319 (#.rax-offset 'alloc-signed-bignum-in-rax)
320 (#.rcx-offset 'alloc-signed-bignum-in-rcx)
321 (#.rdx-offset 'alloc-signed-bignum-in-rdx)
322 (#.rbx-offset 'alloc-signed-bignum-in-rbx)
323 (#.rsi-offset 'alloc-signed-bignum-in-rsi)
324 (#.rdi-offset 'alloc-signed-bignum-in-rdi)
325 (#.r8-offset 'alloc-signed-bignum-in-r8)
326 (#.r9-offset 'alloc-signed-bignum-in-r9)
327 (#.r10-offset 'alloc-signed-bignum-in-r10)
328 (#.r12-offset 'alloc-signed-bignum-in-r12)
329 (#.r13-offset 'alloc-signed-bignum-in-r13)
330 (#.r14-offset 'alloc-signed-bignum-in-r14)
331 (#.r15-offset 'alloc-signed-bignum-in-r15))
333 (inst call temp-reg-tn)
335 (define-move-vop move-from-signed :move
336 (signed-reg) (descriptor-reg))
338 ;;; Convert an untagged unsigned word to a lispobj -- fixnum or bignum
339 ;;; as the case may be. Fixnum case inline, bignum case in an assembly
341 (define-vop (move-from-unsigned)
342 (:args (x :scs (signed-reg unsigned-reg) :to :result))
343 (:results (y :scs (any-reg descriptor-reg) :from :argument))
344 (:note "unsigned word to integer coercion")
345 ;; Worst case cost to make sure people know they may be number consing.
347 (aver (not (location= x y)))
348 (let ((done (gen-label)))
349 (inst mov y #.(ash lowtag-mask (- n-word-bits n-fixnum-tag-bits 1)))
350 ;; The assembly routines test the sign flag from this one, so if
351 ;; you change stuff here, make sure the sign flag doesn't get
352 ;; overwritten before the CALL!
354 ;; Faster but bigger then SHL Y 4. The cost of doing this
355 ;; speculatively should be noise compared to bignum consing if
356 ;; that is needed and saves one branch.
357 (inst lea y (make-ea :qword :index x :scale 8))
360 (inst lea temp-reg-tn
361 (make-ea :qword :disp
362 (make-fixup (ecase (tn-offset y)
363 (#.rax-offset 'alloc-unsigned-bignum-in-rax)
364 (#.rcx-offset 'alloc-unsigned-bignum-in-rcx)
365 (#.rdx-offset 'alloc-unsigned-bignum-in-rdx)
366 (#.rbx-offset 'alloc-unsigned-bignum-in-rbx)
367 (#.rsi-offset 'alloc-unsigned-bignum-in-rsi)
368 (#.rdi-offset 'alloc-unsigned-bignum-in-rdi)
369 (#.r8-offset 'alloc-unsigned-bignum-in-r8)
370 (#.r9-offset 'alloc-unsigned-bignum-in-r9)
371 (#.r10-offset 'alloc-unsigned-bignum-in-r10)
372 (#.r12-offset 'alloc-unsigned-bignum-in-r12)
373 (#.r13-offset 'alloc-unsigned-bignum-in-r13)
374 (#.r14-offset 'alloc-unsigned-bignum-in-r14)
375 (#.r15-offset 'alloc-unsigned-bignum-in-r15))
377 (inst call temp-reg-tn)
379 (define-move-vop move-from-unsigned :move
380 (unsigned-reg) (descriptor-reg))
382 ;;; Move untagged numbers.
383 (define-vop (word-move)
384 (:args (x :scs (signed-reg unsigned-reg) :target y
385 :load-if (not (location= x y))))
386 (:results (y :scs (signed-reg unsigned-reg)
388 (not (or (location= x y)
389 (and (sc-is x signed-reg unsigned-reg)
390 (sc-is y signed-stack unsigned-stack))))))
393 (:note "word integer move")
396 (define-move-vop word-move :move
397 (signed-reg unsigned-reg) (signed-reg unsigned-reg))
399 ;;; Move untagged number arguments/return-values.
400 (define-vop (move-word-arg)
401 (:args (x :scs (signed-reg unsigned-reg) :target y)
402 (fp :scs (any-reg) :load-if (not (sc-is y sap-reg))))
404 (:note "word integer argument move")
407 ((signed-reg unsigned-reg)
409 ((signed-stack unsigned-stack)
410 (if (= (tn-offset fp) esp-offset)
411 (storew x fp (tn-offset y)) ; c-call
412 (storew x fp (frame-word-offset (tn-offset y))))))))
413 (define-move-vop move-word-arg :move-arg
414 (descriptor-reg any-reg signed-reg unsigned-reg) (signed-reg unsigned-reg))
416 ;;; Use standard MOVE-ARG and coercion to move an untagged number
417 ;;; to a descriptor passing location.
418 (define-move-vop move-arg :move-arg
419 (signed-reg unsigned-reg) (any-reg descriptor-reg))