;;;; test generation utilities
(defun generate-fixnum-test (value)
- (emit-optimized-test-inst value 3))
+ (emit-optimized-test-inst value fixnum-tag-mask))
(defun %test-fixnum (value target not-p)
(generate-fixnum-test value)
(inst cmp al-tn immediate))))
(inst jmp (if not-p :ne :e) target))
-(defun %test-lowtag (value target not-p lowtag &optional al-loaded)
- (unless al-loaded
- (move eax-tn value)
- (inst and al-tn lowtag-mask))
+(defun %test-lowtag (value target not-p lowtag)
+ (inst lea eax-tn (make-ea :dword :base value :disp (- lowtag)))
+ (inst test al-tn lowtag-mask)
;; FIXME: another 'optimization' which doesn't appear to work:
;; prefetching the hypothetically pointed-to version should help,
;; but this is in fact non-ideal in plenty of ways: we emit way too
;; not too bad. -- CSR, 2004-07-27
(when (member :prefetch *backend-subfeatures*)
(inst prefetchnta (make-ea :byte :base value :disp (- lowtag))))
- (inst cmp al-tn lowtag)
(inst jmp (if not-p :ne :e) target))
(defun %test-headers (value target not-p function-p headers
- &optional (drop-through (gen-label)) al-loaded)
+ &optional (drop-through (gen-label)))
(let ((lowtag (if function-p fun-pointer-lowtag other-pointer-lowtag)))
(multiple-value-bind (equal less-or-equal greater-or-equal when-true when-false)
;; EQUAL, LESS-OR-EQUAL and GREATER-OR-EQUAL are the conditions for
(if not-p
(values :ne :a :b drop-through target)
(values :e :na :nb target drop-through))
- (%test-lowtag value when-false t lowtag al-loaded)
+ (%test-lowtag value when-false t lowtag)
(cond
((and (null (cdr headers))
(numberp (car headers)))
;; was true.
(return))
(t
- (unless (= start bignum-widetag)
- (inst cmp al-tn start)
- (if (= end complex-array-widetag)
- (progn
- (aver last)
- (inst jmp greater-or-equal target))
- (inst jmp :b when-false))) ; was :l
- (unless (= end complex-array-widetag)
- (inst cmp al-tn end)
- (if last
- (inst jmp less-or-equal target)
- (inst jmp :be when-true)))))))))))) ; was :le
+ (cond
+ ((= start bignum-widetag)
+ (inst cmp al-tn end)
+ (if last
+ (inst jmp less-or-equal target)
+ (inst jmp :be when-true)))
+ ((= end complex-array-widetag)
+ (inst cmp al-tn start)
+ (if last
+ (inst jmp greater-or-equal target)
+ (inst jmp :b when-false)))
+ ((not last)
+ (inst cmp al-tn start)
+ (inst jmp :b when-false)
+ (inst cmp al-tn end)
+ (if last
+ (inst jmp less-or-equal target)
+ (inst jmp :be when-true)))
+ (t
+ (inst sub al-tn start)
+ (inst cmp al-tn (- end start))
+ (inst jmp less-or-equal target))))))))))))
(emit-label drop-through))))
\f
;;;; type checking and testing
(:arg-types unsigned-num)
(:translate fixnump)
(:generator 5
+ ;; We could encode this with :Z and SHR, analogously to the signed-byte-32
+ ;; case below -- as we do on x86-64 -- but that costs us an extra
+ ;; register. Compromises...
(inst cmp value #.sb!xc:most-positive-fixnum)))
+(define-vop (fixnump/signed-byte-32 type-predicate)
+ (:args (value :scs (signed-reg)))
+ (:info)
+ (:conditional :z)
+ (:arg-types signed-num)
+ (:translate fixnump)
+ (:generator 5
+ ;; Hackers Delight, p. 53: signed
+ ;; a <= x <= a + 2^n - 1
+ ;; is equivalent to unsigned
+ ;; ((x-a) >> n) = 0
+ (inst mov eax-tn value)
+ (inst sub eax-tn #.sb!xc:most-negative-fixnum)
+ (inst shr eax-tn #.(integer-length (- sb!xc:most-positive-fixnum
+ sb!xc:most-negative-fixnum)))))
+
;;; A (SIGNED-BYTE 32) can be represented with either fixnum or a bignum with
;;; exactly one digit.
(values target not-target))
(generate-fixnum-test value)
(inst jmp :e yep)
- (move eax-tn value)
- (inst and al-tn lowtag-mask)
- (inst cmp al-tn other-pointer-lowtag)
+ (inst lea eax-tn (make-ea :dword :base value
+ :disp (- other-pointer-lowtag)))
+ (inst test al-tn lowtag-mask)
(inst jmp :ne nope)
- (loadw eax-tn value 0 other-pointer-lowtag)
- (inst cmp eax-tn (+ (ash 1 n-widetag-bits) bignum-widetag))
+ (inst cmp (make-ea-for-object-slot value 0 other-pointer-lowtag)
+ (+ (ash 1 n-widetag-bits) bignum-widetag))
(inst jmp (if not-p :ne :e) target))
NOT-TARGET))
value)))
(generate-fixnum-test value)
(inst jmp :e yep)
- (move eax-tn value)
- (inst and al-tn lowtag-mask)
- (inst cmp al-tn other-pointer-lowtag)
+ (inst lea eax-tn (make-ea :dword :base value
+ :disp (- other-pointer-lowtag)))
+ (inst test al-tn lowtag-mask)
(inst jmp :ne nope)
- (loadw eax-tn value 0 other-pointer-lowtag)
- (inst cmp eax-tn (+ (ash 1 n-widetag-bits) bignum-widetag))
+ (inst cmp (make-ea-for-object-slot value 0 other-pointer-lowtag)
+ (+ (ash 1 n-widetag-bits) bignum-widetag))
(inst jmp :ne nope))
YEP
(move result value)))
(values not-target target)
(values target not-target))
;; Is it a fixnum?
- (generate-fixnum-test value)
(move eax-tn value)
+ (inst test al-tn fixnum-tag-mask)
(inst jmp :e fixnum)
;; If not, is it an other pointer?
;; Get the second digit.
(loadw eax-tn value (1+ bignum-digits-offset) other-pointer-lowtag)
;; All zeros, its an (unsigned-byte 32).
- (inst or eax-tn eax-tn)
+ (inst test eax-tn eax-tn)
(inst jmp :z yep)
(inst jmp nope)
;; positive implies (unsigned-byte 32).
(emit-label fixnum)
- (inst or eax-tn eax-tn)
+ (inst test eax-tn eax-tn)
(inst jmp (if not-p :s :ns) target)
(emit-label not-target)))))
;; Get the second digit.
(loadw eax-tn value (1+ bignum-digits-offset) other-pointer-lowtag)
;; All zeros, its an (unsigned-byte 32).
- (inst or eax-tn eax-tn)
+ (inst test eax-tn eax-tn)
(inst jmp :z yep)
(inst jmp nope)
;; positive implies (unsigned-byte 32).
(emit-label fixnum)
- (inst or eax-tn eax-tn)
+ (inst test eax-tn eax-tn)
(inst jmp :s nope)
(emit-label yep)
(move result value))))
+
+(defun power-of-two-limit-p (x)
+ (and (fixnump x)
+ (= (logcount (1+ x)) 1)))
+
+(define-vop (test-fixnum-mod-power-of-two)
+ (:args (value :scs (any-reg descriptor-reg
+ unsigned-reg signed-reg
+ immediate)))
+ (:arg-types *
+ (:constant (satisfies power-of-two-limit-p)))
+ (:translate sb!c::fixnum-mod-p)
+ (:conditional :e)
+ (:info hi)
+ (:save-p :compute-only)
+ (:policy :fast-safe)
+ (:generator 4
+ (aver (not (sc-is value immediate)))
+ (let* ((fixnum-hi (if (sc-is value unsigned-reg signed-reg)
+ hi
+ (fixnumize hi))))
+ (inst test value (lognot fixnum-hi)))))
+
+(define-vop (test-fixnum-mod-tagged-unsigned)
+ (:args (value :scs (any-reg descriptor-reg
+ unsigned-reg signed-reg
+ immediate)))
+ (:arg-types (:or tagged-num unsigned-num signed-num)
+ (:constant fixnum))
+ (:translate sb!c::fixnum-mod-p)
+ (:conditional :be)
+ (:info hi)
+ (:save-p :compute-only)
+ (:policy :fast-safe)
+ (:generator 5
+ (aver (not (sc-is value immediate)))
+ (let ((fixnum-hi (if (sc-is value unsigned-reg signed-reg)
+ hi
+ (fixnumize hi))))
+ (inst cmp value fixnum-hi))))
+
+(define-vop (test-fixnum-mod-*)
+ (:args (value :scs (any-reg descriptor-reg)))
+ (:arg-types * (:constant fixnum))
+ (:translate sb!c::fixnum-mod-p)
+ (:conditional)
+ (:info target not-p hi)
+ (:save-p :compute-only)
+ (:policy :fast-safe)
+ (:generator 6
+ (let* ((fixnum-hi (fixnumize hi))
+ (skip (gen-label)))
+ (generate-fixnum-test value)
+ (inst jmp :ne (if not-p target skip))
+ (inst cmp value fixnum-hi)
+ (inst jmp (if not-p :a :be) target)
+ (emit-label skip))))
+
\f
;;;; list/symbol types
;;;
projects / sbcl.git / blobdiff