(in-package "SB!VM")
\f
-;;;; from signed/unsigned
+;;;; Signed and unsigned bignums from word-sized integers. Argument
+;;;; and return in the same register. No VOPs, as these are only used
+;;;; as out-of-line versions: MOVE-FROM-[UN]SIGNED VOPs handle the
+;;;; fixnum cases inline.
-;;; KLUDGE: Why don't we want vops for this one and the next
-;;; one? -- WHN 19990916
-#+sb-assembling ; We don't want a vop for this one.
-(define-assembly-routine
- (move-from-signed)
- ((:temp eax unsigned-reg eax-offset)
- (:temp ebx unsigned-reg ebx-offset))
- (inst mov ebx eax)
- (inst shl ebx 1)
- (inst jmp :o BIGNUM)
- (inst shl ebx 1)
- (inst jmp :o BIGNUM)
- (inst shl ebx 1)
- (inst jmp :o BIGNUM)
- (inst ret)
- BIGNUM
-
- (with-fixed-allocation (ebx bignum-widetag (+ bignum-digits-offset 1))
- (storew eax ebx bignum-digits-offset other-pointer-lowtag))
-
- (inst ret))
-
-#+sb-assembling ; We don't want a vop for this one either.
-(define-assembly-routine
- (move-from-unsigned)
- ((:temp eax unsigned-reg eax-offset)
- (:temp ebx unsigned-reg ebx-offset))
-
- (inst bsr ebx eax)
- (inst cmp ebx 61)
- (inst jmp :z DONE)
- (inst jmp :ge BIGNUM)
- ;; Fixnum
- (inst mov ebx eax)
- (inst shl ebx 3)
- DONE
- (inst ret)
-
- BIGNUM
- (with-fixed-allocation (ebx bignum-widetag (+ bignum-digits-offset 2))
- (storew eax ebx bignum-digits-offset other-pointer-lowtag))
- (inst ret))
+;;; #+SB-ASSEMBLING as we don't need VOPS, just the asm routines:
+;;; these are out-of-line versions called by VOPs.
+#+sb-assembling
+(macrolet
+ ((def (reg)
+ `(define-assembly-routine (,(symbolicate "ALLOC-SIGNED-BIGNUM-IN-" reg))
+ ((:temp number unsigned-reg ,(symbolicate reg "-OFFSET")))
+ (inst push number)
+ (with-fixed-allocation (number bignum-widetag (+ bignum-digits-offset 1))
+ (popw number bignum-digits-offset other-pointer-lowtag))
+ (inst ret))))
+ (def rax)
+ (def rcx)
+ (def rdx)
+ (def rbx)
+ (def rsi)
+ (def rdi)
+ (def r8)
+ (def r9)
+ (def r10)
+ (def r12)
+ (def r13)
+ (def r14)
+ (def r15))
+#+sb-assembling
+(macrolet
+ ((def (reg)
+ `(define-assembly-routine (,(symbolicate "ALLOC-UNSIGNED-BIGNUM-IN-" reg))
+ ((:temp number unsigned-reg ,(symbolicate reg "-OFFSET")))
+ (inst push number)
+ (inst jmp :ns one-word-bignum)
+ ;; Two word bignum
+ (with-fixed-allocation (number bignum-widetag (+ bignum-digits-offset 2))
+ (popw number bignum-digits-offset other-pointer-lowtag))
+ (inst ret)
+ ONE-WORD-BIGNUM
+ (with-fixed-allocation (number bignum-widetag (+ bignum-digits-offset 1))
+ (popw number bignum-digits-offset other-pointer-lowtag))
+ (inst ret))))
+ (def rax)
+ (def rcx)
+ (def rdx)
+ (def rbx)
+ (def rsi)
+ (def rdi)
+ (def r8)
+ (def r9)
+ (def r10)
+ (def r12)
+ (def r13)
+ (def r14)
+ (def r15))
(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))
(: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)))
- ;; We can't do the overflow check with SHL Y, 3, since the
- ;; state of the overflow flag is only reliably set when
- ;; shifting by 1. There used to be code here for doing "shift
- ;; by one, check whether it overflowed" three times. But on all
- ;; x86-64 processors IMUL is a reasonably fast instruction, so
- ;; we can just do a straight multiply instead of trying to
- ;; optimize it to a shift. This is both faster and smaller.
- ;; -- JES, 2006-07-08
- (inst imul y x (ash 1 n-fixnum-tag-bits))
- (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)))))
+ (let ((done (gen-label)))
+ (inst imul y x #.(ash 1 n-fixnum-tag-bits))
+ (inst jmp :no done)
+ (inst mov y x)
+ (inst lea temp-reg-tn
+ (make-ea :qword :disp
+ (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)
+ (emit-label 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)
+ (let ((done (gen-label)))
+ (inst mov y #.(ash lowtag-mask (- n-word-bits n-fixnum-tag-bits 1)))
+ ;; 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)
+ ;; Faster but bigger then SHL Y 4. The cost of doing this
+ ;; speculatively should be noise compared to bignum consing if
+ ;; that is needed and saves one branch.
(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)))))
+ (inst jmp :z done)
+ (inst mov y x)
+ (inst lea temp-reg-tn
+ (make-ea :qword :disp
+ (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))
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