1;;;; the sparc implementation of unknown-values VOPs
2
3;;;; This software is part of the SBCL system. See the README file for
4;;;; more information.
5;;;;
6;;;; This software is derived from the CMU CL system, which was
7;;;; written at Carnegie Mellon University and released into the
8;;;; public domain. The software is in the public domain and is
9;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10;;;; files for more information.
11
12(in-package "SB!VM")
13
14(define-vop (reset-stack-pointer)
15  (:args (ptr :scs (any-reg)))
16  (:generator 1
17    (move csp-tn ptr)))
18
19(define-vop (%%pop-dx)
20  (:args (ptr :scs (any-reg)))
21  (:ignore ptr)
22  (:generator 1
23    (bug "VOP %%POP-DX is not implemented.")))
24
25(define-vop (%%nip-dx)
26  (:args (last-nipped-ptr :scs (any-reg) :target dest)
27         (last-preserved-ptr :scs (any-reg) :target src)
28         (moved-ptrs :scs (any-reg) :more t))
29  (:results (r-moved-ptrs :scs (any-reg) :more t))
30  (:temporary (:sc any-reg) src)
31  (:temporary (:sc any-reg) dest)
32  (:temporary (:sc non-descriptor-reg) temp)
33  (:ignore r-moved-ptrs
34           last-nipped-ptr last-preserved-ptr moved-ptrs
35           src dest temp)
36  (:generator 1
37    (bug "VOP %%NIP-DX is not implemented.")))
38
39(define-vop (%%nip-values)
40  (:args (last-nipped-ptr :scs (any-reg) :target dest)
41         (last-preserved-ptr :scs (any-reg) :target src)
42         (moved-ptrs :scs (any-reg) :more t))
43  (:results (r-moved-ptrs :scs (any-reg) :more t))
44  (:temporary (:sc any-reg) src)
45  (:temporary (:sc any-reg) dest)
46  (:temporary (:sc non-descriptor-reg) temp)
47  (:ignore r-moved-ptrs)
48  (:generator 1
49    (inst move dest last-nipped-ptr)
50    (inst move src last-preserved-ptr)
51    (inst cmp csp-tn src)
52    (inst b :le DONE)
53    (inst nop) ; not strictly necessary
54    LOOP
55    (loadw temp src)
56    (inst add dest dest n-word-bytes)
57    (inst add src src n-word-bytes)
58    (storew temp dest -1)
59    (inst cmp csp-tn src)
60    (inst b :gt LOOP)
61    (inst nop)
62    DONE
63    (inst move csp-tn dest)
64    (inst sub src src dest)
65    (loop for moved = moved-ptrs then (tn-ref-across moved)
66          while moved
67          do (sc-case (tn-ref-tn moved)
68               ((descriptor-reg any-reg)
69                (inst sub (tn-ref-tn moved) (tn-ref-tn moved) src))
70               ((control-stack)
71                (load-stack-tn temp (tn-ref-tn moved))
72                (inst sub temp temp src)
73                (store-stack-tn (tn-ref-tn moved) temp))))))
74
75;;; Push some values onto the stack, returning the start and number of
76;;; values pushed as results.  It is assumed that the Vals are wired
77;;; to the standard argument locations.  Nvals is the number of values
78;;; to push.
79;;;
80;;; The generator cost is pseudo-random.  We could get it right by
81;;; defining a bogus SC that reflects the costs of the
82;;; memory-to-memory moves for each operand, but this seems
83;;; unworthwhile.
84(define-vop (push-values)
85  (:args (vals :more t))
86  (:results (start :scs (any-reg) :from :load)
87            (count :scs (any-reg)))
88  (:info nvals)
89  (:temporary (:scs (descriptor-reg)) temp)
90  (:generator 20
91    (inst move start csp-tn)
92    (inst add csp-tn csp-tn (* nvals n-word-bytes))
93    (do ((val vals (tn-ref-across val))
94         (i 0 (1+ i)))
95        ((null val))
96      (let ((tn (tn-ref-tn val)))
97        (sc-case tn
98          (descriptor-reg
99           (storew tn start i))
100          (control-stack
101           (load-stack-tn temp tn)
102           (storew temp start i)))))
103    (inst li count (fixnumize nvals))))
104
105;;; Push a list of values on the stack, returning Start and Count as
106;;; used in unknown values continuations.
107(define-vop (values-list)
108  (:args (arg :scs (descriptor-reg) :target list))
109  (:arg-types list)
110  (:policy :fast-safe)
111  (:results (start :scs (any-reg))
112            (count :scs (any-reg)))
113  (:temporary (:scs (descriptor-reg) :type list :from (:argument 0)) list)
114  (:temporary (:scs (descriptor-reg)) temp)
115  (:temporary (:scs (non-descriptor-reg)) ndescr)
116  (:vop-var vop)
117  (:save-p :compute-only)
118  (:generator 0
119    (let ((loop (gen-label))
120          (done (gen-label)))
121
122      (move list arg)
123      (move start csp-tn)
124
125      (emit-label loop)
126      (inst cmp list null-tn)
127      (inst b :eq done)
128      (loadw temp list cons-car-slot list-pointer-lowtag)
129      (loadw list list cons-cdr-slot list-pointer-lowtag)
130      (inst add csp-tn csp-tn n-word-bytes)
131      (storew temp csp-tn -1)
132      (test-type list loop nil (list-pointer-lowtag) :temp ndescr)
133      (error-call vop 'bogus-arg-to-values-list-error list)
134
135      (emit-label done)
136      (inst sub count csp-tn start))))
137
138
139
140;;; Copy the more arg block to the top of the stack so we can use them
141;;; as function arguments.
142(define-vop (%more-arg-values)
143  (:args (context :scs (descriptor-reg any-reg) :target src)
144         (skip :scs (any-reg zero immediate))
145         (num :scs (any-reg) :target count))
146  (:arg-types * positive-fixnum positive-fixnum)
147  (:temporary (:sc any-reg :from (:argument 0)) src)
148  (:temporary (:sc any-reg :from (:argument 2)) dst)
149  (:temporary (:sc descriptor-reg :from (:argument 1)) temp)
150  (:temporary (:sc any-reg) i)
151  (:results (start :scs (any-reg))
152            (count :scs (any-reg)))
153  (:generator 20
154    (sc-case skip
155      (zero
156       (move src context))
157      (immediate
158       (inst add src context (* (tn-value skip) n-word-bytes)))
159      (any-reg
160       (inst add src context skip)))
161    (inst orcc count zero-tn num)
162    (inst b :eq done)
163    (inst move start csp-tn)
164    (inst move dst csp-tn)
165    (inst add csp-tn count)
166    (inst move i count)
167    LOOP
168    (inst subcc i 4)
169    (inst ld temp src i)
170    (inst b :ne loop)
171    (inst st temp dst i)
172    DONE))
173