- (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.
- (if not-p
- (values :ne :a drop-through target)
- (values :e :na 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)
- (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
+ (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 :b drop-through target)
+ (values :e :na :nb target drop-through))
+ (%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)
+ (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))))))))))))