1 ;;;; the Alpha implementation of unknown-values VOPs
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-vop (reset-stack-pointer)
15 (:args (ptr :scs (any-reg)))
19 (define-vop (%%pop-dx)
20 (:args (ptr :scs (any-reg)))
23 (bug "VOP %%POP-DX is not implemented.")))
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)
34 last-nipped-ptr last-preserved-ptr moved-ptrs
37 (bug "VOP %%NIP-DX is not implemented.")))
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)
49 (move last-nipped-ptr dest)
50 (move last-preserved-ptr src)
51 (inst cmple csp-tn src temp)
55 (inst addq dest n-word-bytes dest)
56 (inst addq src n-word-bytes src)
58 (inst cmple csp-tn src temp)
61 (inst lda csp-tn 0 dest)
62 (inst subq src dest src)
63 (loop for moved = moved-ptrs then (tn-ref-across moved)
65 do (sc-case (tn-ref-tn moved)
66 ((descriptor-reg any-reg)
67 (inst subq (tn-ref-tn moved) src (tn-ref-tn moved)))
69 (load-stack-tn temp (tn-ref-tn moved))
70 (inst subq temp src temp)
71 (store-stack-tn (tn-ref-tn moved) temp))))))
73 ;;; Push some values onto the stack, returning the start and number of
74 ;;; values pushed as results. It is assumed that the Vals are wired to
75 ;;; the standard argument locations. Nvals is the number of values to
78 ;;; The generator cost is pseudo-random. We could get it right by
79 ;;; defining a bogus SC that reflects the costs of the
80 ;;; memory-to-memory moves for each operand, but this seems
82 (define-vop (push-values)
86 (start :scs (any-reg))
87 (count :scs (any-reg)))
89 (:temporary (:scs (descriptor-reg)) temp)
90 (:temporary (:scs (descriptor-reg)
95 (move csp-tn start-temp)
96 (inst lda csp-tn (* nvals n-word-bytes) csp-tn)
97 (do ((val vals (tn-ref-across val))
100 (let ((tn (tn-ref-tn val)))
103 (storew tn start-temp i))
105 (load-stack-tn temp tn)
106 (storew temp start-temp i)))))
107 (move start-temp start)
108 (inst li (fixnumize nvals) count)))
110 ;;; Push a list of values on the stack, returning Start and Count as
111 ;;; used in unknown values continuations.
112 (define-vop (values-list)
113 (:args (arg :scs (descriptor-reg) :target list))
116 (:results (start :scs (any-reg))
117 (count :scs (any-reg)))
118 (:temporary (:scs (descriptor-reg) :type list :from (:argument 0)) list)
119 (:temporary (:scs (non-descriptor-reg)) temp)
120 (:temporary (:scs (non-descriptor-reg)) ndescr)
122 (:save-p :compute-only)
128 (inst cmpeq list null-tn temp)
130 (loadw temp list cons-car-slot list-pointer-lowtag)
131 (loadw list list cons-cdr-slot list-pointer-lowtag)
132 (inst lda csp-tn n-word-bytes csp-tn)
133 (storew temp csp-tn -1)
134 (inst and list lowtag-mask ndescr)
135 (inst xor ndescr list-pointer-lowtag ndescr)
136 (inst beq ndescr loop)
137 (error-call vop bogus-arg-to-values-list-error list)
140 (inst subq csp-tn start count)))
142 ;;; Copy the &MORE arg block to the top of the stack so we can use
143 ;;; them as function arguments.
144 (define-vop (%more-arg-values)
145 (:args (context :scs (descriptor-reg any-reg) :target src)
146 (skip :scs (any-reg zero immediate))
147 (num :scs (any-reg) :target count))
148 (:arg-types * positive-fixnum positive-fixnum)
149 (:temporary (:sc any-reg :from (:argument 0)) src)
150 (:temporary (:sc any-reg :from (:argument 2)) dst)
151 (:temporary (:sc descriptor-reg :from (:argument 1)) temp)
152 (:temporary (:sc non-descriptor-reg) temp1)
153 (:results (start :scs (any-reg))
154 (count :scs (any-reg)))
160 (inst lda src (* (tn-value skip) n-word-bytes) context))
162 (inst addq context skip src)))
164 (inst move csp-tn start)
166 (inst move csp-tn dst)
167 (inst addq csp-tn count csp-tn)
169 (inst ldl temp 0 src)
170 (inst addq src 4 src)
171 (inst addq dst 4 dst)
172 (inst stl temp -4 dst)
173 (inst cmpeq dst csp-tn temp1)
174 (inst beq temp1 loop)