\f
;;;; test generation utilities
-;;; Emit the most compact form of the test immediate instruction,
-;;; using an 8 bit test when the immediate is only 8 bits and the
-;;; value is one of the four low registers (eax, ebx, ecx, edx) or the
-;;; control stack.
(defun generate-fixnum-test (value)
- (let ((offset (tn-offset value)))
- (cond ((and (sc-is value any-reg descriptor-reg)
- (or (= offset eax-offset) (= offset ebx-offset)
- (= offset ecx-offset) (= offset edx-offset)))
- (inst test (make-random-tn :kind :normal
- :sc (sc-or-lose 'byte-reg)
- :offset offset)
- 3))
- ((sc-is value control-stack)
- (inst test (make-ea :byte :base ebp-tn
- :disp (- (* (1+ offset) n-word-bytes)))
- 3))
- (t
- (inst test 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)
- (inst mov al-tn (make-ea :byte :base value :disp (- lowtag)))
- (do ((remaining headers (cdr remaining)))
- ((null remaining))
- (let ((header (car remaining))
- (last (null (cdr remaining))))
- (cond
- ((atom header)
- (cond
- ((and (not last) (null (cddr remaining))
- (atom (cadr remaining))
- (= (logcount (logxor header (cadr remaining))) 1))
- ;; BASE-STRING, (VECTOR NIL), BIT-VECTOR, (VECTOR T)
- (inst and al-tn (ldb (byte 8 0) (logeqv header (cadr remaining))))
- (inst cmp al-tn (ldb (byte 8 0) (logand header (cadr remaining))))
- (inst jmp equal target)
- (return))
- (t
- (inst cmp al-tn header)
- (if last
+ (%test-lowtag value when-false t lowtag)
+ (cond
+ ((and (null (cdr headers))
+ (numberp (car headers)))
+ ;; Optimize the common case: referencing the value from memory
+ ;; is slightly smaller than loading it and then doing the
+ ;; comparison. Doing this for other cases (e.g. range of
+ ;; [BIGNUM-WIDETAG..FOO-WIDETAG]) is also possible, but such
+ ;; opportunities don't come up very often and the code would
+ ;; get pretty hairy...
+ (inst cmp (make-ea :byte :base value :disp (- lowtag)) (car headers))
+ (inst jmp equal target))
+ (t
+ (inst mov al-tn (make-ea :byte :base value :disp (- lowtag)))
+ (do ((remaining headers (cdr remaining)))
+ ((null remaining))
+ (let ((header (car remaining))
+ (last (null (cdr remaining))))
+ (cond
+ ((atom header)
+ (cond
+ ((and (not last) (null (cddr remaining))
+ (atom (cadr remaining))
+ (= (logcount (logxor header (cadr remaining))) 1))
+ ;; BASE-STRING, (VECTOR NIL), BIT-VECTOR, (VECTOR T)
+ (inst and al-tn (ldb (byte 8 0) (logeqv header (cadr remaining))))
+ (inst cmp al-tn (ldb (byte 8 0) (logand header (cadr remaining))))
(inst jmp equal target)
- (inst jmp :e when-true)))))
- (t
- (let ((start (car header))
- (end (cdr header)))
- (cond
- ;; LAST = don't need al-tn later
- ((and last (not (= start bignum-widetag))
- (= (+ start 4) end) (= (logcount (logxor start end)) 1))
- ;; SIMPLE-STRING
- (inst and al-tn (ldb (byte 8 0) (logeqv start end)))
- (inst cmp al-tn (ldb (byte 8 0) (logand start end)))
- (inst jmp equal target))
- ((and (not last) (null (cddr remaining))
- (= (+ start 4) end) (= (logcount (logxor start end)) 1)
- (listp (cadr remaining))
- (= (+ (caadr remaining) 4) (cdadr remaining))
- (= (logcount (logxor (caadr remaining) (cdadr remaining))) 1)
- (= (logcount (logxor (caadr remaining) start)) 1))
- ;; STRING
- (inst and al-tn (ldb (byte 8 0) (logeqv start (cdadr remaining))))
- (inst cmp al-tn (ldb (byte 8 0) (logand start (cdadr remaining))))
- (inst jmp equal target)
- ;; we've shortcircuited the DO, so we must return.
- ;; It's OK to do so, because (NULL (CDDR REMAINING))
- ;; 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
+ (return))
+ (t
+ (inst cmp al-tn header)
+ (if last
+ (inst jmp equal target)
+ (inst jmp :e when-true)))))
+ (t
+ (let ((start (car header))
+ (end (cdr header)))
+ (cond
+ ;; LAST = don't need al-tn later
+ ((and last (not (= start bignum-widetag))
+ (= (+ start 4) end) (= (logcount (logxor start end)) 1))
+ ;; SIMPLE-STRING
+ (inst and al-tn (ldb (byte 8 0) (logeqv start end)))
+ (inst cmp al-tn (ldb (byte 8 0) (logand start end)))
+ (inst jmp equal target))
+ ((and (not last) (null (cddr remaining))
+ (= (+ start 4) end) (= (logcount (logxor start end)) 1)
+ (listp (cadr remaining))
+ (= (+ (caadr remaining) 4) (cdadr remaining))
+ (= (logcount (logxor (caadr remaining) (cdadr remaining))) 1)
+ (= (logcount (logxor (caadr remaining) start)) 1))
+ ;; STRING
+ (inst and al-tn (ldb (byte 8 0) (logeqv start (cdadr remaining))))
+ (inst cmp al-tn (ldb (byte 8 0) (logand start (cdadr remaining))))
+ (inst jmp equal target)
+ ;; we've shortcircuited the DO, so we must return.
+ ;; It's OK to do so, because (NULL (CDDR REMAINING))
+ ;; was true.
+ (return))
+ (t
+ (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
`((define-vop (,check-name ,(intern (concatenate 'string prefix "CHECK-TYPE")))
(:generator ,cost
(let ((err-lab
- (generate-error-code vop ,error-code value)))
+ (generate-error-code vop ',error-code value)))
(test-type value err-lab t (,@type-codes))
(move result value))))))
,@(when ptype
(define-vop (fixnump/unsigned-byte-32 simple-type-predicate)
(:args (value :scs (unsigned-reg)))
+ (:info)
+ (:conditional :be)
(:arg-types unsigned-num)
(:translate fixnump)
(:generator 5
- (inst cmp value #.sb!xc:most-positive-fixnum)
- (inst jmp (if not-p :a :be) target)))
+ ;; 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))
(define-vop (check-signed-byte-32 check-type)
(:generator 45
(let ((nope (generate-error-code vop
- object-not-signed-byte-32-error
+ 'object-not-signed-byte-32-error
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)))))
(define-vop (check-unsigned-byte-32 check-type)
(:generator 45
(let ((nope
- (generate-error-code vop object-not-unsigned-byte-32-error value))
+ (generate-error-code vop 'object-not-unsigned-byte-32-error value))
(yep (gen-label))
(fixnum (gen-label))
(single-word (gen-label)))
;; 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
;;;
(define-vop (check-symbol check-type)
(:generator 12
- (let ((error (generate-error-code vop object-not-symbol-error value)))
+ (let ((error (generate-error-code vop 'object-not-symbol-error value)))
(inst cmp value nil-value)
(inst jmp :e drop-thru)
(test-type value error t (symbol-header-widetag)))
(define-vop (check-cons check-type)
(:generator 8
- (let ((error (generate-error-code vop object-not-cons-error value)))
+ (let ((error (generate-error-code vop 'object-not-cons-error value)))
(inst cmp value nil-value)
(inst jmp :e error)
(test-type value error t (list-pointer-lowtag))
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