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;;;; stuff to handle simple cases for generic arithmetic
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!VM")
#+sb-assembling
(defun %static-fun-call (static-fun-name lip nargs ocfp)
(inst ldq lip (static-fun-offset static-fun-name) null-tn)
(inst li (fixnumize 2) nargs)
(inst move cfp-tn ocfp)
(inst move csp-tn cfp-tn)
(inst jmp zero-tn lip))
(define-assembly-routine (generic-+
(:cost 10)
(:return-style :full-call)
(:translate +)
(:policy :safe)
(:save-p t))
((:arg x (descriptor-reg any-reg) a0-offset)
(:arg y (descriptor-reg any-reg) a1-offset)
(:res res (descriptor-reg any-reg) a0-offset)
(:temp temp non-descriptor-reg nl0-offset)
(:temp temp2 non-descriptor-reg nl1-offset)
(:temp lip interior-reg lip-offset)
(:temp lra descriptor-reg lra-offset)
(:temp nargs any-reg nargs-offset)
(:temp ocfp any-reg ocfp-offset))
;; check for fixnums
(inst or x y temp)
(inst and temp fixnum-tag-mask temp)
(inst bne temp DO-STATIC-FUN)
(inst move x temp2) ; save a copy of x
(inst addq x y res)
;; check for overflow. this is a long and complicated process because
;; Alpha doesn't provide any condition bits or anything like that,
;; prefering instead to provide instructions which trap to the OS on
;; overflow. trapping to the OS would cause all sorts of problems, I
;; think, so we do things the long way.
(inst xor temp2 y temp) ; combine x and y's sign bit
(inst blt temp DONE) ; they were not equal, get out of here
;; even if the sign bits were equal, the addition might not have
;; overflowed. check the sign bit of the result.
(inst xor res temp2 temp) ; combine res and x's sign bit
(inst bge temp DONE) ; they were equal, get out of here
;; do the add the proper way
(inst sra temp2 n-fixnum-tag-bits temp)
(inst sra y n-fixnum-tag-bits temp2)
(inst addq temp temp2 temp)
; from move-from-signed
(with-fixed-allocation (res temp2 bignum-widetag (1+ bignum-digits-offset))
(storew temp res bignum-digits-offset other-pointer-lowtag))
DONE
(lisp-return lra lip :offset 2)
DO-STATIC-FUN
(%static-fun-call 'two-arg-+ lip nargs ocfp))
(define-assembly-routine (generic--
(:cost 10)
(:return-style :full-call)
(:translate -)
(:policy :safe)
(:save-p t))
((:arg x (descriptor-reg any-reg) a0-offset)
(:arg y (descriptor-reg any-reg) a1-offset)
(:res res (descriptor-reg any-reg) a0-offset)
(:temp temp non-descriptor-reg nl0-offset)
(:temp temp2 non-descriptor-reg nl1-offset)
(:temp lip interior-reg lip-offset)
(:temp lra descriptor-reg lra-offset)
(:temp nargs any-reg nargs-offset)
(:temp ocfp any-reg ocfp-offset))
;; check for fixnums
(inst or x y temp)
(inst and temp fixnum-tag-mask temp)
(inst bne temp DO-STATIC-FUN)
(inst move x temp2)
(inst subq x y res)
;; check for overflow
(inst xor y temp2 temp) ; combine sign bits
(inst bge temp DONE) ; they were equal, get out of here
;; check the sign bit of the result
(inst xor res temp2 temp) ; combine sign bits
(inst bge temp DONE) ; they were equal, get out of here
;; do the subtract the proper way
(inst sra temp2 n-fixnum-tag-bits temp)
(inst sra y n-fixnum-tag-bits temp2)
(inst subq temp temp2 temp)
; from move-from-signed
(with-fixed-allocation (res temp2 bignum-widetag (1+ bignum-digits-offset))
(storew temp res bignum-digits-offset other-pointer-lowtag))
DONE
(lisp-return lra lip :offset 2)
DO-STATIC-FUN
(%static-fun-call 'two-arg-- lip nargs ocfp))
(define-assembly-routine (generic-*
(:cost 25)
(:return-style :full-call)
(:translate *)
(:policy :safe)
(:save-p t))
((:arg x (descriptor-reg any-reg) a0-offset)
(:arg y (descriptor-reg any-reg) a1-offset)
(:res res (descriptor-reg any-reg) a0-offset)
(:temp temp non-descriptor-reg nl0-offset)
(:temp lo non-descriptor-reg nl1-offset)
(:temp hi non-descriptor-reg nl2-offset)
(:temp temp2 non-descriptor-reg nl3-offset)
(:temp lip interior-reg lip-offset)
(:temp lra descriptor-reg lra-offset)
(:temp nargs any-reg nargs-offset)
(:temp ocfp any-reg ocfp-offset))
;; check for fixnums
(inst or x y temp)
(inst and temp fixnum-tag-mask temp)
(inst bne temp DO-STATIC-FUN)
;; Remove the tag from one arg so that the result will have the
;; correct fixnum tag.
(inst sra x n-fixnum-tag-bits temp)
(inst mulq temp y res)
(inst umulh temp y hi)
;; check to see if the result will fit in a fixnum (i.e. the high word
;; is just 64 copies of the sign bit of the low word).
(inst sra res 63 temp)
(inst xor temp hi temp)
(inst beq temp DONE)
;; Shift the double word hi:res down three bits into hi:low to get rid
;; of the fixnum tag.
(inst srl res n-fixnum-tag-bits lo)
(inst sll hi (- n-word-bits n-fixnum-tag-bits) temp)
(inst or lo temp lo)
(inst sra hi n-fixnum-tag-bits hi)
;; Do we need one word or two? Assume two.
(inst li (logior (ash 2 n-widetag-bits) bignum-widetag) temp2)
(inst sra lo 63 temp)
(inst xor temp hi temp)
(inst bne temp two-words)
;; Only need one word, fix the header.
(inst li (logior (ash 1 n-widetag-bits) bignum-widetag) temp2)
;; Allocate one word.
(pseudo-atomic (:extra (pad-data-block (1+ bignum-digits-offset)))
(inst or alloc-tn other-pointer-lowtag res)
(storew temp2 res 0 other-pointer-lowtag))
;; Store one word
(storew lo res bignum-digits-offset other-pointer-lowtag)
;; Out of here
(lisp-return lra lip :offset 2)
TWO-WORDS
;; Allocate two words.
(pseudo-atomic (:extra (pad-data-block (+ 2 bignum-digits-offset)))
(inst or alloc-tn other-pointer-lowtag res)
(storew temp2 res 0 other-pointer-lowtag))
;; Store two words.
(storew lo res bignum-digits-offset other-pointer-lowtag)
(storew hi res (1+ bignum-digits-offset) other-pointer-lowtag)
;; out of here
(lisp-return lra lip :offset 2)
DO-STATIC-FUN
(%static-fun-call 'two-arg-* lip nargs ocfp)
DONE)
;;;; division
(define-assembly-routine (signed-truncate
(:note "(signed-byte 64) truncate")
(:cost 60)
(:policy :fast-safe)
(:translate truncate)
(:arg-types signed-num signed-num)
(:result-types signed-num signed-num))
((:arg dividend signed-reg nl0-offset)
(:arg divisor signed-reg nl1-offset)
(:res quo signed-reg nl2-offset)
(:res rem signed-reg nl3-offset)
(:temp quo-sign signed-reg nl5-offset)
(:temp rem-sign signed-reg nargs-offset)
(:temp temp1 non-descriptor-reg nl4-offset))
(let ((error (generate-error-code nil division-by-zero-error
dividend divisor)))
(inst beq divisor error))
(inst xor dividend divisor quo-sign)
(inst move dividend rem-sign)
(let ((label (gen-label)))
(inst bge dividend label)
(inst subq zero-tn dividend dividend)
(emit-label label))
(let ((label (gen-label)))
(inst bge divisor label)
(inst subq zero-tn divisor divisor)
(emit-label label))
(inst move zero-tn rem)
(inst move zero-tn quo)
(dotimes (i 64)
(inst srl dividend 63 temp1)
(inst sll rem 1 rem)
(inst or temp1 rem rem)
(inst cmple divisor rem temp1)
(inst sll quo 1 quo)
(inst or temp1 quo quo)
(inst sll dividend 1 dividend)
(inst subq temp1 1 temp1)
(inst zap divisor temp1 temp1)
(inst subq rem temp1 rem))
(let ((label (gen-label)))
;; If the quo-sign is negative, we need to negate quo.
(inst bge quo-sign label)
(inst subq zero-tn quo quo)
(emit-label label))
(let ((label (gen-label)))
;; If the rem-sign is negative, we need to negate rem.
(inst bge rem-sign label)
(inst subq zero-tn rem rem)
(emit-label label)))
;;;; comparison routines
(macrolet
((define-cond-assem-rtn (name translate static-fn cmp not-p)
`(define-assembly-routine (,name
(:cost 10)
(:return-style :full-call)
(:policy :safe)
(:translate ,translate)
(:save-p t))
((:arg x (descriptor-reg any-reg) a0-offset)
(:arg y (descriptor-reg any-reg) a1-offset)
(:res res descriptor-reg a0-offset)
(:temp temp non-descriptor-reg nl0-offset)
(:temp lip interior-reg lip-offset)
(:temp nargs any-reg nargs-offset)
(:temp ocfp any-reg ocfp-offset))
(inst and x fixnum-tag-mask temp)
(inst bne temp DO-STATIC-FUN)
(inst and y fixnum-tag-mask temp)
(inst beq temp DO-COMPARE)
DO-STATIC-FUN
(%static-fun-call ',static-fn lip nargs ocfp)
DO-COMPARE
,cmp
(inst move null-tn res)
(inst ,(if not-p 'bne 'beq) temp done)
(load-symbol res t)
DONE)))
(define-cond-assem-rtn generic-< < two-arg-< (inst cmplt x y temp) nil)
(define-cond-assem-rtn generic-> > two-arg-> (inst cmplt y x temp) nil))
(define-assembly-routine (generic-eql
(:cost 10)
(:return-style :full-call)
(:policy :safe)
(:translate eql)
(:save-p t))
((:arg x (descriptor-reg any-reg) a0-offset)
(:arg y (descriptor-reg any-reg) a1-offset)
(:res res descriptor-reg a0-offset)
(:temp temp non-descriptor-reg nl0-offset)
(:temp lip interior-reg lip-offset)
(:temp lra descriptor-reg lra-offset)
(:temp nargs any-reg nargs-offset)
(:temp ocfp any-reg ocfp-offset))
;; check easy case
(inst cmpeq x y temp)
(inst bne temp RETURN-T)
;; if X is a fixnum, then we're done (since it's not equal to Y)
(inst and x fixnum-tag-mask temp)
(inst beq temp RETURN-NIL)
;; if Y is a fixnum, then we're done; if not, we really need to compare
(inst and y fixnum-tag-mask temp)
(inst bne temp DO-STATIC-FUN)
RETURN-NIL
(inst move null-tn res)
(lisp-return lra lip :offset 2)
DO-STATIC-FUN
(%static-fun-call 'eql lip nargs ocfp)
RETURN-T
(load-symbol res t))
(define-assembly-routine (generic-=
(:cost 10)
(:return-style :full-call)
(:policy :safe)
(:translate =)
(:save-p t))
((:arg x (descriptor-reg any-reg) a0-offset)
(:arg y (descriptor-reg any-reg) a1-offset)
(:res res descriptor-reg a0-offset)
(:temp temp non-descriptor-reg nl0-offset)
(:temp lip interior-reg lip-offset)
(:temp lra descriptor-reg lra-offset)
(:temp nargs any-reg nargs-offset)
(:temp ocfp any-reg ocfp-offset))
;; check for fixnums
(inst or x y temp)
(inst and temp fixnum-tag-mask temp)
(inst bne temp DO-STATIC-FUN)
(inst cmpeq x y temp)
(inst bne temp RETURN-T)
(inst move null-tn res)
(lisp-return lra lip :offset 2)
DO-STATIC-FUN
(%static-fun-call 'two-arg-= lip nargs ocfp)
RETURN-T
(load-symbol res t))
(define-assembly-routine (generic-/=
(:cost 10)
(:return-style :full-call)
(:policy :safe)
(:translate /=)
(:save-p t))
((:arg x (descriptor-reg any-reg) a0-offset)
(:arg y (descriptor-reg any-reg) a1-offset)
(:res res descriptor-reg a0-offset)
(:temp temp non-descriptor-reg nl0-offset)
(:temp lip interior-reg lip-offset)
(:temp lra descriptor-reg lra-offset)
(:temp nargs any-reg nargs-offset)
(:temp ocfp any-reg ocfp-offset))
;; check for fixnums
(inst or x y temp)
(inst and temp fixnum-tag-mask temp)
(inst bne temp DO-STATIC-FUN)
(inst cmpeq x y temp)
(inst bne temp RETURN-NIL)
(load-symbol res t)
(lisp-return lra lip :offset 2)
DO-STATIC-FUN
(%static-fun-call 'two-arg-= lip nargs ocfp)
RETURN-NIL
(inst move null-tn res))