(unless al-loaded
(move eax-tn value)
(inst and 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
+ ;; many of these prefetch instructions; pointed-to objects are very
+ ;; often in the cache anyway; etc. etc. Still, as proof-of-concept,
+ ;; 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)
(let ((lowtag (if function-p fun-pointer-lowtag other-pointer-lowtag)))
- (multiple-value-bind (equal less-or-equal when-true when-false)
- ;; EQUAL and LESS-OR-EQUAL are the conditions for branching to TARGET.
- ;; WHEN-TRUE and WHEN-FALSE are the labels to branch to when we know
- ;; it's true and when we know it's false respectively.
+ (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
+ ;; branching to TARGET. WHEN-TRUE and WHEN-FALSE are the
+ ;; labels to branch to when we know it's true and when we know
+ ;; it's false respectively.
(if not-p
- (values :ne :a drop-through target)
- (values :e :na target drop-through))
+ (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)))
(last (null (cdr remaining))))
(cond
((atom header)
- (inst cmp al-tn header)
- (if last
- (inst jmp equal target)
- (inst jmp :e when-true)))
+ (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
+ (inst jmp equal target)
+ (inst jmp :e when-true)))))
(t
(let ((start (car header))
(end (cdr header)))
- (unless (= start bignum-widetag)
- (inst cmp al-tn start)
- (inst jmp :b when-false)) ; was :l
- (inst cmp al-tn end)
- (if last
- (inst jmp less-or-equal target)
- (inst jmp :be when-true))))))) ; was :le
+ (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
(emit-label drop-through))))
-
\f
;;;; type checking and testing
projects / sbcl.git / blobdiff