-;;;; the x86 VM definition of operand loading/saving and the MOVE vop
+;;;; the x86-64 VM definition of operand loading/saving and the MOVE vop
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
(in-package "SB!VM")
+(defun make-byte-tn (tn)
+ (aver (sc-is tn any-reg descriptor-reg unsigned-reg signed-reg))
+ (make-random-tn :kind :normal
+ :sc (sc-or-lose 'byte-reg)
+ :offset (tn-offset tn)))
+
+(defun make-dword-tn (tn)
+ (aver (sc-is tn any-reg descriptor-reg character-reg
+ unsigned-reg signed-reg))
+ (make-random-tn :kind :normal
+ :sc (sc-or-lose 'dword-reg)
+ :offset (tn-offset tn)))
+
+(defun zeroize (tn)
+ (let ((offset (tn-offset tn)))
+ ;; Using the 32-bit instruction accomplishes the same thing and is
+ ;; one byte shorter.
+ (if (<= offset edi-offset)
+ (let ((tn (make-random-tn :kind :normal
+ :sc (sc-or-lose 'dword-reg)
+ :offset offset)))
+ (inst xor tn tn))
+ (inst xor tn tn))))
+
(define-move-fun (load-immediate 1) (vop x y)
((immediate)
(any-reg descriptor-reg))
(etypecase val
(integer
(if (zerop val)
- (inst xor y y)
- (inst mov y (fixnumize val))))
+ (zeroize y)
+ (inst mov y (fixnumize val))))
(symbol
(load-symbol y val))
(character
(inst mov y (logior (ash (char-code val) n-widetag-bits)
- character-widetag))))))
+ character-widetag))))))
(define-move-fun (load-number 1) (vop x y)
((immediate) (signed-reg unsigned-reg))
- (inst mov y (tn-value x)))
+ (let ((val (tn-value x)))
+ (if (zerop val)
+ (zeroize y)
+ (inst mov y val))))
(define-move-fun (load-character 1) (vop x y)
((immediate) (character-reg))
;;;; the MOVE VOP
(define-vop (move)
(:args (x :scs (any-reg descriptor-reg immediate) :target y
- :load-if (not (location= x y))))
+ :load-if (not (location= x y))))
(:results (y :scs (any-reg descriptor-reg)
- :load-if
- (not (or (location= x y)
- (and (sc-is x any-reg descriptor-reg immediate)
- (sc-is y control-stack))))))
+ :load-if
+ (not (or (location= x y)
+ (and (sc-is x any-reg descriptor-reg immediate)
+ (sc-is y control-stack))))))
(:temporary (:sc unsigned-reg) temp)
(:effects)
(:affected)
(:generator 0
(if (and (sc-is x immediate)
- (sc-is y any-reg descriptor-reg control-stack))
- (let ((val (tn-value x)))
- (etypecase val
- (integer
- (if (and (zerop val) (sc-is y any-reg descriptor-reg))
- (inst xor y y)
- (move-immediate y (fixnumize val) temp)))
- (symbol
- (inst mov y (+ nil-value (static-symbol-offset val))))
- (character
- (inst mov y (logior (ash (char-code val) n-widetag-bits)
- character-widetag)))))
- (move y x))))
+ (sc-is y any-reg descriptor-reg control-stack))
+ (let ((val (tn-value x)))
+ (etypecase val
+ (integer
+ (move-immediate y (fixnumize val) temp))
+ (symbol
+ (inst mov y (+ nil-value (static-symbol-offset val))))
+ (character
+ (inst mov y (logior (ash (char-code val) n-widetag-bits)
+ character-widetag)))))
+ (move y x))))
(define-move-vop move :move
(any-reg descriptor-reg immediate)
(cond
;; If target is a register, we can just mov it there directly
((and (tn-p target)
- (sc-is target signed-reg unsigned-reg descriptor-reg any-reg))
- (inst mov target val))
+ (sc-is target signed-reg unsigned-reg descriptor-reg any-reg))
+ (if (zerop val)
+ (zeroize target)
+ (inst mov target val)))
;; Likewise if the value is small enough.
- ((typep val '(signed-byte 31))
+ ((typep val '(signed-byte 32))
(inst mov target val))
;; Otherwise go through the temporary register
(tmp-tn
;;; this case the loading works out.
(define-vop (move-arg)
(:args (x :scs (any-reg descriptor-reg immediate) :target y
- :load-if (not (and (sc-is y any-reg descriptor-reg)
- (sc-is x control-stack))))
- (fp :scs (any-reg)
- :load-if (not (sc-is y any-reg descriptor-reg))))
+ :load-if (not (and (sc-is y any-reg descriptor-reg)
+ (sc-is x control-stack))))
+ (fp :scs (any-reg)
+ :load-if (not (sc-is y any-reg descriptor-reg))))
(:results (y))
(:generator 0
(sc-case y
((any-reg descriptor-reg)
(if (sc-is x immediate)
- (let ((val (tn-value x)))
- (etypecase val
- ((integer 0 0)
- (inst xor y y))
- ((or (signed-byte 29) (unsigned-byte 29))
- (inst mov y (fixnumize val)))
- (integer
- (move-immediate y (fixnumize val)))
- (symbol
- (load-symbol y val))
- (character
- (inst mov y (logior (ash (char-code val) n-widetag-bits)
- character-widetag)))))
- (move y x)))
+ (let ((val (tn-value x)))
+ (etypecase val
+ ((integer 0 0)
+ (zeroize y))
+ (integer
+ (inst mov y (fixnumize val)))
+ (symbol
+ (load-symbol y val))
+ (character
+ (inst mov y (logior (ash (char-code val) n-widetag-bits)
+ character-widetag)))))
+ (move y x)))
((control-stack)
(if (sc-is x immediate)
- (let ((val (tn-value x)))
- (if (= (tn-offset fp) esp-offset)
- ;; C-call
- (etypecase val
- (integer
- (storew (fixnumize val) fp (tn-offset y)))
- (symbol
- (storew (+ nil-value (static-symbol-offset val))
- fp (tn-offset y)))
- (character
- (storew (logior (ash (char-code val) n-widetag-bits)
- character-widetag)
- fp (tn-offset y))))
- ;; Lisp stack
- (etypecase val
- (integer
- (storew (fixnumize val) fp (- (1+ (tn-offset y)))))
- (symbol
- (storew (+ nil-value (static-symbol-offset val))
- fp (- (1+ (tn-offset y)))))
- (character
- (storew (logior (ash (char-code val) n-widetag-bits)
- character-widetag)
- fp (- (1+ (tn-offset y))))))))
- (if (= (tn-offset fp) esp-offset)
- ;; C-call
- (storew x fp (tn-offset y))
- ;; Lisp stack
- (storew x fp (- (1+ (tn-offset y))))))))))
+ (let ((val (tn-value x)))
+ (if (= (tn-offset fp) esp-offset)
+ ;; C-call
+ (etypecase val
+ (integer
+ (storew (fixnumize val) fp (tn-offset y)))
+ (symbol
+ (storew (+ nil-value (static-symbol-offset val))
+ fp (tn-offset y)))
+ (character
+ (storew (logior (ash (char-code val) n-widetag-bits)
+ character-widetag)
+ fp (tn-offset y))))
+ ;; Lisp stack
+ (etypecase val
+ (integer
+ (storew (fixnumize val) fp (frame-word-offset (tn-offset y))))
+ (symbol
+ (storew (+ nil-value (static-symbol-offset val))
+ fp (frame-word-offset (tn-offset y))))
+ (character
+ (storew (logior (ash (char-code val) n-widetag-bits)
+ character-widetag)
+ fp (frame-word-offset (tn-offset y)))))))
+ (if (= (tn-offset fp) esp-offset)
+ ;; C-call
+ (storew x fp (tn-offset y))
+ ;; Lisp stack
+ (storew x fp (frame-word-offset (tn-offset y)))))))))
(define-move-vop move-arg :move-arg
(any-reg descriptor-reg)
(:vop-var vop)
(:save-p :compute-only)
(:generator 666
- (error-call vop object-not-type-error x type)))
+ (error-call vop 'object-not-type-error x type)))
\f
;;;; moves and coercions
;;; possible bignum arg SCs.
(define-vop (move-to-word/fixnum)
(:args (x :scs (any-reg descriptor-reg) :target y
- :load-if (not (location= x y))))
+ :load-if (not (location= x y))))
(:results (y :scs (signed-reg unsigned-reg)
- :load-if (not (location= x y))))
+ :load-if (not (location= x y))))
(:arg-types tagged-num)
(:note "fixnum untagging")
(:generator 1
(move y x)
- (inst sar y (1- n-lowtag-bits))))
+ (inst sar y n-fixnum-tag-bits)))
(define-move-vop move-to-word/fixnum :move
(any-reg descriptor-reg) (signed-reg unsigned-reg))
(:results (y :scs (signed-reg unsigned-reg)))
(:note "constant load")
(:generator 1
- (inst mov y (tn-value x))))
+ (cond ((sb!c::tn-leaf x)
+ (inst mov y (tn-value x)))
+ (t
+ (inst mov y x)
+ (inst sar y n-fixnum-tag-bits)))))
(define-move-vop move-to-word-c :move
(constant) (signed-reg unsigned-reg))
;;; Arg is a fixnum or bignum, figure out which and load if necessary.
+#-#.(cl:if (cl:= sb!vm:n-fixnum-tag-bits 1) '(:and) '(:or))
(define-vop (move-to-word/integer)
- (:args (x :scs (descriptor-reg) :target eax))
+ (:args (x :scs (descriptor-reg) :target rax))
(:results (y :scs (signed-reg unsigned-reg)))
(:note "integer to untagged word coercion")
- (:temporary (:sc unsigned-reg :offset eax-offset
- :from (:argument 0) :to (:result 0) :target y) eax)
+ ;; I'm not convinced that increasing the demand for rAX is
+ ;; better than adding 1 byte to some instruction encodings.
+ ;; I'll leave it alone though.
+ (:temporary (:sc unsigned-reg :offset rax-offset
+ :from (:argument 0) :to (:result 0) :target y) rax)
(:generator 4
- (move eax x)
- (inst test al-tn 7) ; a symbolic constant for this
- (inst jmp :z FIXNUM) ; would be nice
- (loadw y eax bignum-digits-offset other-pointer-lowtag)
+ (move rax x)
+ (inst test al-tn fixnum-tag-mask)
+ (inst jmp :z FIXNUM)
+ (loadw y rax bignum-digits-offset other-pointer-lowtag)
(inst jmp DONE)
FIXNUM
- (inst sar eax (1- n-lowtag-bits))
- (move y eax)
+ (inst sar rax n-fixnum-tag-bits)
+ (move y rax)
+ DONE))
+
+#+#.(cl:if (cl:= sb!vm:n-fixnum-tag-bits 1) '(:and) '(:or))
+(define-vop (move-to-word/integer)
+ (:args (x :scs (descriptor-reg) :target y))
+ (:results (y :scs (signed-reg unsigned-reg)))
+ (:note "integer to untagged word coercion")
+ (:temporary (:sc unsigned-reg) backup)
+ (:generator 4
+ (move y x)
+ (if (location= x y)
+ ;; It would be great if a principled way existed to advise GC of
+ ;; algebraic transforms such as 2*R being a conservative root.
+ ;; Until that is possible, emit straightforward code that uses
+ ;; a copy of the potential reference.
+ (move backup x)
+ (setf backup x))
+ (inst sar y 1) ; optimistically assume it's a fixnum
+ (inst jmp :nc DONE) ; no carry implies tag was 0
+ (loadw y backup bignum-digits-offset other-pointer-lowtag)
DONE))
+
(define-move-vop move-to-word/integer :move
(descriptor-reg) (signed-reg unsigned-reg))
-
;;; Result is a fixnum, so we can just shift. We need the result type
;;; restriction because of the control-stack ambiguity noted above.
(define-vop (move-from-word/fixnum)
(:args (x :scs (signed-reg unsigned-reg) :target y
- :load-if (not (location= x y))))
+ :load-if (not (location= x y))))
(:results (y :scs (any-reg descriptor-reg)
- :load-if (not (location= x y))))
+ :load-if (not (location= x y))))
(:result-types tagged-num)
(:note "fixnum tagging")
(:generator 1
(cond ((and (sc-is x signed-reg unsigned-reg)
- (not (location= x y)))
- ;; Uses 7 bytes, but faster on the Pentium
- (inst lea y (make-ea :qword :index x :scale 8)))
- (t
- ;; Uses: If x is a reg 2 + 3; if x = y uses only 3 bytes
- (move y x)
- (inst shl y (1- n-lowtag-bits))))))
+ (not (location= x y)))
+ (if (= n-fixnum-tag-bits 1)
+ (inst lea y (make-ea :qword :base x :index x))
+ (inst lea y (make-ea :qword :index x
+ :scale (ash 1 n-fixnum-tag-bits)))))
+ (t
+ ;; Uses: If x is a reg 2 + 3; if x = y uses only 3 bytes
+ (move y x)
+ (inst shl y n-fixnum-tag-bits)))))
(define-move-vop move-from-word/fixnum :move
(signed-reg unsigned-reg) (any-reg descriptor-reg))
-;;; Result may be a bignum, so we have to check. Use a worst-case cost
-;;; to make sure people know they may be number consing.
+;;; Convert an untagged signed word to a lispobj -- fixnum or bignum
+;;; as the case may be. Fixnum case inline, bignum case in an assembly
+;;; routine.
(define-vop (move-from-signed)
- (:args (x :scs (signed-reg unsigned-reg) :to :result))
- (:results (y :scs (any-reg descriptor-reg) :from :argument))
+ (:args (x :scs (signed-reg unsigned-reg) :to :result . #.(and (= 1 n-fixnum-tag-bits)
+ '(:target y))))
+ (:results (y :scs (any-reg descriptor-reg) . #.(and (> n-fixnum-tag-bits 1)
+ '(:from :argument))))
(:note "signed word to integer coercion")
- (:node-var node)
+ ;; Worst case cost to make sure people know they may be number consing.
(:generator 20
- (aver (not (location= x y)))
- (let ((bignum (gen-label))
- (done (gen-label)))
- (inst mov y x)
- (inst shl y 1)
- (inst jmp :o bignum)
- (inst shl y 1)
- (inst jmp :o bignum)
- (inst shl y 1)
- (inst jmp :o bignum)
- (emit-label done)
-
- (assemble (*elsewhere*)
- (emit-label bignum)
- (with-fixed-allocation
- (y bignum-widetag (+ bignum-digits-offset 1) node)
- (storew x y bignum-digits-offset other-pointer-lowtag))
- (inst jmp done)))))
+ (cond ((= 1 n-fixnum-tag-bits)
+ (move y x)
+ (inst shl y 1)
+ (inst jmp :no DONE)
+ (if (location= y x)
+ (inst rcr y 1) ; we're about to cons a bignum. this RCR is noise
+ (inst mov y x)))
+ (t
+ (aver (not (location= x y)))
+ (inst imul y x #.(ash 1 n-fixnum-tag-bits))
+ (inst jmp :no DONE)
+ (inst mov y x)))
+ (inst mov temp-reg-tn
+ (make-fixup (ecase (tn-offset y)
+ (#.rax-offset 'alloc-signed-bignum-in-rax)
+ (#.rcx-offset 'alloc-signed-bignum-in-rcx)
+ (#.rdx-offset 'alloc-signed-bignum-in-rdx)
+ (#.rbx-offset 'alloc-signed-bignum-in-rbx)
+ (#.rsi-offset 'alloc-signed-bignum-in-rsi)
+ (#.rdi-offset 'alloc-signed-bignum-in-rdi)
+ (#.r8-offset 'alloc-signed-bignum-in-r8)
+ (#.r9-offset 'alloc-signed-bignum-in-r9)
+ (#.r10-offset 'alloc-signed-bignum-in-r10)
+ (#.r12-offset 'alloc-signed-bignum-in-r12)
+ (#.r13-offset 'alloc-signed-bignum-in-r13)
+ (#.r14-offset 'alloc-signed-bignum-in-r14)
+ (#.r15-offset 'alloc-signed-bignum-in-r15))
+ :assembly-routine))
+ (inst call temp-reg-tn)
+ DONE))
(define-move-vop move-from-signed :move
(signed-reg) (descriptor-reg))
-;;; Check for fixnum, and possibly allocate one or two word bignum
-;;; result. Use a worst-case cost to make sure people know they may be
-;;; number consing.
-
+;;; Convert an untagged unsigned word to a lispobj -- fixnum or bignum
+;;; as the case may be. Fixnum case inline, bignum case in an assembly
+;;; routine.
(define-vop (move-from-unsigned)
- (:args (x :scs (signed-reg unsigned-reg) :to :save))
- (:temporary (:sc unsigned-reg) alloc)
- (:results (y :scs (any-reg descriptor-reg)))
- (:node-var node)
+ (:args (x :scs (signed-reg unsigned-reg) :to :result))
+ (:results (y :scs (any-reg descriptor-reg) :from :argument))
(:note "unsigned word to integer coercion")
+ ;; Worst case cost to make sure people know they may be number consing.
(:generator 20
(aver (not (location= x y)))
- (aver (not (location= x alloc)))
- (aver (not (location= y alloc)))
- (let ((bignum (gen-label))
- (done (gen-label))
- (one-word-bignum (gen-label))
- (L1 (gen-label)))
- (inst bsr y x) ;find msb
- (inst cmov :z y x)
- (inst cmp y 60)
- (inst jmp :ae bignum)
- (inst lea y (make-ea :qword :index x :scale 8))
- (emit-label done)
- (assemble (*elsewhere*)
- (emit-label bignum)
- ;; Note: As on the mips port, space for a two word bignum is
- ;; always allocated and the header size is set to either one
- ;; or two words as appropriate.
- (inst cmp y 63)
- (inst jmp :l one-word-bignum)
- ;; two word bignum
- (inst mov y (logior (ash (1- (+ bignum-digits-offset 2))
- n-widetag-bits)
- bignum-widetag))
- (inst jmp L1)
- (emit-label one-word-bignum)
- (inst mov y (logior (ash (1- (+ bignum-digits-offset 1))
- n-widetag-bits)
- bignum-widetag))
- (emit-label L1)
- (pseudo-atomic
- (allocation alloc (pad-data-block (+ bignum-digits-offset 2)) node)
- (storew y alloc)
- (inst lea y (make-ea :byte :base alloc :disp other-pointer-lowtag))
- (storew x y bignum-digits-offset other-pointer-lowtag))
- (inst jmp done)))))
+ (let ((done (gen-label)))
+ (inst mov y #.(ash (1- (ash 1 (1+ n-fixnum-tag-bits)))
+ n-positive-fixnum-bits))
+ ;; The assembly routines test the sign flag from this one, so if
+ ;; you change stuff here, make sure the sign flag doesn't get
+ ;; overwritten before the CALL!
+ (inst test x y)
+ ;; Using LEA is faster but bigger than MOV+SHL; it also doesn't
+ ;; twiddle the sign flag. The cost of doing this speculatively
+ ;; should be noise compared to bignum consing if that is needed
+ ;; and saves one branch.
+ (if (= n-fixnum-tag-bits 1)
+ (inst lea y (make-ea :qword :base x :index x))
+ (inst lea y (make-ea :qword :index x
+ :scale (ash 1 n-fixnum-tag-bits))))
+ (inst jmp :z done)
+ (inst mov y x)
+ (inst mov temp-reg-tn
+ (make-fixup (ecase (tn-offset y)
+ (#.rax-offset 'alloc-unsigned-bignum-in-rax)
+ (#.rcx-offset 'alloc-unsigned-bignum-in-rcx)
+ (#.rdx-offset 'alloc-unsigned-bignum-in-rdx)
+ (#.rbx-offset 'alloc-unsigned-bignum-in-rbx)
+ (#.rsi-offset 'alloc-unsigned-bignum-in-rsi)
+ (#.rdi-offset 'alloc-unsigned-bignum-in-rdi)
+ (#.r8-offset 'alloc-unsigned-bignum-in-r8)
+ (#.r9-offset 'alloc-unsigned-bignum-in-r9)
+ (#.r10-offset 'alloc-unsigned-bignum-in-r10)
+ (#.r12-offset 'alloc-unsigned-bignum-in-r12)
+ (#.r13-offset 'alloc-unsigned-bignum-in-r13)
+ (#.r14-offset 'alloc-unsigned-bignum-in-r14)
+ (#.r15-offset 'alloc-unsigned-bignum-in-r15))
+ :assembly-routine))
+ (inst call temp-reg-tn)
+ (emit-label done))))
(define-move-vop move-from-unsigned :move
(unsigned-reg) (descriptor-reg))
;;; Move untagged numbers.
(define-vop (word-move)
(:args (x :scs (signed-reg unsigned-reg) :target y
- :load-if (not (location= x y))))
+ :load-if (not (location= x y))))
(:results (y :scs (signed-reg unsigned-reg)
- :load-if
- (not (or (location= x y)
- (and (sc-is x signed-reg unsigned-reg)
- (sc-is y signed-stack unsigned-stack))))))
+ :load-if
+ (not (or (location= x y)
+ (and (sc-is x signed-reg unsigned-reg)
+ (sc-is y signed-stack unsigned-stack))))))
(:effects)
(:affected)
(:note "word integer move")
;;; Move untagged number arguments/return-values.
(define-vop (move-word-arg)
(:args (x :scs (signed-reg unsigned-reg) :target y)
- (fp :scs (any-reg) :load-if (not (sc-is y sap-reg))))
+ (fp :scs (any-reg) :load-if (not (sc-is y sap-reg))))
(:results (y))
(:note "word integer argument move")
(:generator 0
(move y x))
((signed-stack unsigned-stack)
(if (= (tn-offset fp) esp-offset)
- (storew x fp (tn-offset y)) ; c-call
- (storew x fp (- (1+ (tn-offset y)))))))))
+ (storew x fp (tn-offset y)) ; c-call
+ (storew x fp (frame-word-offset (tn-offset y))))))))
(define-move-vop move-word-arg :move-arg
(descriptor-reg any-reg signed-reg unsigned-reg) (signed-reg unsigned-reg))
projects / sbcl.git / blobdiff