1 ;;;; the HPPA 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 (define-move-fun (load-immediate 1) (vop x y)
15 ((null zero immediate)
16 (any-reg descriptor-reg))
17 (let ((val (tn-value x)))
20 (inst li (fixnumize val) y))
26 (inst li (logior (ash (char-code val) n-widetag-bits)
30 (define-move-fun (load-number 1) (vop x y)
32 (signed-reg unsigned-reg))
33 (let ((x (tn-value x)))
34 (inst li (if (>= x (ash 1 31)) (logior (ash -1 32) x) x) y)))
36 (define-move-fun (load-character 1) (vop x y)
37 ((immediate) (character-reg))
38 (inst li (char-code (tn-value x)) y))
40 (define-move-fun (load-system-area-pointer 1) (vop x y)
41 ((immediate) (sap-reg))
42 (inst li (sap-int (tn-value x)) y))
44 (define-move-fun (load-constant 5) (vop x y)
45 ((constant) (descriptor-reg))
46 (loadw y code-tn (tn-offset x) other-pointer-lowtag))
48 (define-move-fun (load-stack 5) (vop x y)
49 ((control-stack) (any-reg descriptor-reg))
52 (define-move-fun (load-number-stack 5) (vop x y)
53 ((character-stack) (character-reg)
55 (signed-stack) (signed-reg)
56 (unsigned-stack) (unsigned-reg))
57 (let ((nfp (current-nfp-tn vop)))
58 (loadw y nfp (tn-offset x))))
60 (define-move-fun (store-stack 5) (vop x y)
61 ((any-reg descriptor-reg) (control-stack))
64 (define-move-fun (store-number-stack 5) (vop x y)
65 ((character-reg) (character-stack)
67 (signed-reg) (signed-stack)
68 (unsigned-reg) (unsigned-stack))
69 (let ((nfp (current-nfp-tn vop)))
70 (storew x nfp (tn-offset y))))
76 :scs (any-reg descriptor-reg)
77 :load-if (not (location= x y))))
78 (:results (y :scs (any-reg descriptor-reg)
79 :load-if (not (location= x y))))
85 (define-move-vop move :move
86 (any-reg descriptor-reg)
87 (any-reg descriptor-reg))
89 ;;; Make MOVE the check VOP for T so that type check generation
90 ;;; doesn't think it is a hairy type. This also allows checking of a
91 ;;; few of the values in a continuation to fall out.
92 (primitive-type-vop move (:check) t)
94 ;;; The MOVE-ARG VOP is used for moving descriptor values into another
95 ;;; frame for argument or known value passing.
96 (define-vop (move-arg)
98 :scs (any-reg descriptor-reg))
100 :load-if (not (sc-is y any-reg descriptor-reg))))
104 ((any-reg descriptor-reg)
107 (storew x fp (tn-offset y))))))
108 (define-move-vop move-arg :move-arg
109 (any-reg descriptor-reg)
110 (any-reg descriptor-reg))
116 ;;; This VOP exists just to begin the lifetime of a TN that couldn't
117 ;;; be written legally due to a type error. An error is signalled
118 ;;; before this VOP is so we don't need to do anything (not that there
119 ;;; would be anything sensible to do anyway.)
120 (define-vop (illegal-move)
125 (:save-p :compute-only)
127 (error-call vop object-not-type-error x type)))
129 ;;;; Moves and coercions:
131 ;;; These MOVE-TO-WORD VOPs move a tagged integer to a raw full-word
132 ;;; representation. Similarly, the MOVE-FROM-WORD VOPs converts a raw integer
133 ;;; to a tagged bignum or fixnum.
135 ;;; ARG is a fixnum, so just shift it. We need a type restriction
136 ;;; because some possible arg SCs (control-stack) overlap with
137 ;;; possible bignum arg SCs.
138 (define-vop (move-to-word/fixnum)
139 (:args (x :scs (any-reg descriptor-reg)))
140 (:results (y :scs (signed-reg unsigned-reg)))
141 (:arg-types tagged-num)
142 (:note "fixnum untagging")
145 (define-move-vop move-to-word/fixnum :move
146 (any-reg descriptor-reg) (signed-reg unsigned-reg))
148 ;;; ARG is a non-immediate constant, load it.
149 (define-vop (move-to-word-c)
150 (:args (x :scs (constant)))
151 (:results (y :scs (signed-reg unsigned-reg)))
152 (:note "constant load")
154 (inst li (tn-value x) y)))
155 (define-move-vop move-to-word-c :move
156 (constant) (signed-reg unsigned-reg))
158 ;;; ARG is a fixnum or bignum, figure out which and load if necessary.
159 (define-vop (move-to-word/integer)
160 (:args (x :scs (descriptor-reg)))
161 (:results (y :scs (signed-reg unsigned-reg)))
162 (:note "integer to untagged word coercion")
164 (inst extru x 31 2 zero-tn :<>)
166 (loadw y x bignum-digits-offset other-pointer-lowtag)))
167 (define-move-vop move-to-word/integer :move
168 (descriptor-reg) (signed-reg unsigned-reg))
170 ;;; RESULT is a fixnum, so we can just shift. We need the result type
171 ;;; restriction because of the control-stack ambiguity noted above.
172 (define-vop (move-from-word/fixnum)
173 (:args (x :scs (signed-reg unsigned-reg)))
174 (:results (y :scs (any-reg descriptor-reg)))
175 (:result-types tagged-num)
176 (:note "fixnum tagging")
179 (define-move-vop move-from-word/fixnum :move
180 (signed-reg unsigned-reg) (any-reg descriptor-reg))
182 ;;; RESULT may be a bignum, so we have to check. Use a worst-case
183 ;;; cost to make sure people know they may be number consing.
184 (define-vop (move-from-signed)
185 (:args (x :scs (signed-reg unsigned-reg) :to (:eval 1)))
186 (:results (y :scs (any-reg descriptor-reg) :from (:eval 0)))
187 (:temporary (:scs (non-descriptor-reg)) temp)
188 (:note "signed word to integer coercion")
190 ;; Extract the top three bits.
191 (inst extrs x 2 3 temp :=)
192 ;; Invert them (unless they are already zero).
193 (inst uaddcm zero-tn temp temp)
194 ;; If we are left with zero, it will fit in a fixnum. So branch around
195 ;; the bignum-construction, doing the shift in the delay slot.
196 (inst comb := temp zero-tn done)
198 ;; Make a single-digit bignum.
199 (with-fixed-allocation (y temp bignum-widetag (1+ bignum-digits-offset))
200 (storew x y bignum-digits-offset other-pointer-lowtag))
202 (define-move-vop move-from-signed :move
203 (signed-reg) (descriptor-reg))
205 ;;; Check for fixnum, and possibly allocate one or two word bignum
206 ;;; result. Use a worst-case cost to make sure people know they may
207 ;;; be number consing.
208 (define-vop (move-from-unsigned)
209 (:args (x :scs (signed-reg unsigned-reg) :to (:eval 1)))
210 (:results (y :scs (any-reg descriptor-reg) :from (:eval 0)))
211 (:temporary (:scs (non-descriptor-reg)) temp)
212 (:note "unsigned word to integer coercion")
214 ;; Grab the top three bits.
215 (inst extrs x 2 3 temp)
216 ;; If zero, it will fit as a fixnum.
217 (inst comib := 0 temp done)
220 (pseudo-atomic (:extra (pad-data-block (1+ bignum-digits-offset)))
221 ;; Create the result pointer.
222 (inst move alloc-tn y)
223 (inst dep other-pointer-lowtag 31 3 y)
224 ;; Check the high bit, and skip the next instruction if it's 0.
225 (inst comclr x zero-tn zero-tn :>=)
226 ;; The high bit is set, so allocate enough space for a two-word bignum.
227 ;; We always skip the following instruction, so it is only executed
228 ;; when we want one word.
229 (inst addi (pad-data-block 1) alloc-tn alloc-tn :tr)
230 ;; Set up the header for one word. Use ADDI instead of LI so we can
231 ;; skip the next instruction.
232 (inst addi (logior (ash 1 n-widetag-bits) bignum-widetag) zero-tn temp :tr)
233 ;; Set up the header for two words.
234 (inst li (logior (ash 2 n-widetag-bits) bignum-widetag) temp)
235 ;; Store the header and the data.
236 (storew temp y 0 other-pointer-lowtag)
237 (storew x y bignum-digits-offset other-pointer-lowtag))
239 (define-move-vop move-from-unsigned :move
240 (unsigned-reg) (descriptor-reg))
242 ;;; Move untagged numbers.
243 (define-vop (word-move)
245 :scs (signed-reg unsigned-reg)
246 :load-if (not (location= x y))))
247 (:results (y :scs (signed-reg unsigned-reg)
248 :load-if (not (location= x y))))
251 (:note "word integer move")
254 (define-move-vop word-move :move
255 (signed-reg unsigned-reg) (signed-reg unsigned-reg))
257 ;;; Move untagged number args/return-values.
258 (define-vop (move-word-arg)
260 :scs (signed-reg unsigned-reg))
262 :load-if (not (sc-is y sap-reg))))
264 (:note "word integer argument move")
267 ((signed-reg unsigned-reg)
269 ((signed-stack unsigned-stack)
270 (storew x fp (tn-offset y))))))
271 (define-move-vop move-word-arg :move-arg
272 (descriptor-reg any-reg signed-reg unsigned-reg) (signed-reg unsigned-reg))
274 ;;; Use standard MOVE-ARG + coercion to move an untagged number to a
275 ;;; descriptor passing location.
276 (define-move-vop move-arg :move-arg
277 (signed-reg unsigned-reg) (any-reg descriptor-reg))