1.0.12.10: sequence optimizations: SUBSEQ, part 1
[sbcl.git] / src / compiler / seqtran.lisp
index a7d55cd..3efefa2 100644 (file)
   (if (policy node (= 0 insert-array-bounds-checks))
       '(or end (length vector))
       '(let ((length (length vector)))
-        (if (<= 0 start (or end length) length)
-            (or end length)
-            (sb!impl::signal-bounding-indices-bad-error vector start end)))))
+         (if (<= 0 start (or end length) length)
+             (or end length)
+             (sequence-bounding-indices-bad-error vector start end)))))
 
 (defun specialized-list-seek-function-name (function-name key-functions)
   (or (find-symbol (with-output-to-string (s)
           ,(unless (policy node (= safety 0))
              `(progn
                  (unless (<= 0 start1 end1 len1)
-                   (sb!impl::signal-bounding-indices-bad-error seq1 start1 end1))
+                   (sequence-bounding-indices-bad-error seq1 start1 end1))
                  (unless (<= 0 start2 end2 len2)
-                   (sb!impl::signal-bounding-indices-bad-error seq2 start2 end2))))
+                   (sequence-bounding-indices-bad-error seq2 start2 end2))))
           ,',(cond
               ((and saetp (valid-bit-bash-saetp-p saetp))
                (let* ((n-element-bits (sb!vm:saetp-n-bits saetp))
                   (type (integer 0 #.sb!xc:array-dimension-limit) j i))
          (setf (aref ,dst (1- j)) (aref ,src (1- i))))))
 
+;;; SUBSEQ, COPY-SEQ
+
 (deftransform subseq ((seq start &optional end)
-                      ((or (simple-unboxed-array (*)) simple-vector) t &optional t)
-                      * :node node)
-  (let ((array-type (lvar-type seq)))
-    (unless (array-type-p array-type)
-      (give-up-ir1-transform))
-    (let ((element-type (type-specifier (array-type-specialized-element-type array-type))))
-      `(let* ((length (length seq))
-              (end (or end length)))
-         ,(unless (policy node (= safety 0))
-                  '(progn
-                    (unless (<= 0 start end length)
-                      (sb!impl::signal-bounding-indices-bad-error seq start end))))
-         (let* ((size (- end start))
-                (result (make-array size :element-type ',element-type)))
-           ,(maybe-expand-copy-loop-inline 'seq (if (constant-lvar-p start)
-                                                    (lvar-value start)
-                                                    'start)
-                                           'result 0 'size element-type)
-           result)))))
+                      (vector t &optional t)
+                      *
+                      :node node)
+  (let ((type (lvar-type seq)))
+    (cond
+      ((and (array-type-p type)
+            (csubtypep type (specifier-type '(or (simple-unboxed-array (*)) simple-vector))))
+       (let ((element-type (type-specifier (array-type-specialized-element-type type))))
+         `(let* ((length (length seq))
+                 (end (or end length)))
+            ,(unless (policy node (zerop insert-array-bounds-checks))
+                     '(progn
+                       (unless (<= 0 start end length)
+                         (sequence-bounding-indices-bad-error seq start end))))
+            (let* ((size (- end start))
+                   (result (make-array size :element-type ',element-type)))
+              ,(maybe-expand-copy-loop-inline 'seq (if (constant-lvar-p start)
+                                                       (lvar-value start)
+                                                       'start)
+                                              'result 0 'size element-type)
+              result))))
+      (t
+       '(vector-subseq* seq start end)))))
 
 (deftransform subseq ((seq start &optional end)
                       (list t &optional t))
   `(list-subseq* seq start end))
 
+(deftransform subseq ((seq start &optional end)
+                      ((and sequence (not vector) (not list)) t &optional t))
+  '(sb!sequence:subseq seq start end))
+
 (deftransform copy-seq ((seq) ((or (simple-unboxed-array (*)) simple-vector)) *)
   (let ((array-type (lvar-type seq)))
     (unless (array-type-p array-type)
                                from-end)
                       (vector vector &rest t)
                       *
+                      :node node
                       :policy (> speed (max space safety)))
   "open code"
   (let ((from-end (when (lvar-p from-end)
                       (give-up-ir1-transform ":FROM-END is not constant."))
                     (lvar-value from-end)))
         (keyp (lvar-p key))
-        (testp (lvar-p test)))
+        (testp (lvar-p test))
+        (check-bounds-p (policy node (plusp insert-array-bounds-checks))))
     `(block search
-       (let ((end1 (or end1 (length pattern)))
-             (end2 (or end2 (length text)))
-             ,@(when keyp
-                     '((key (coerce key 'function))))
-             ,@(when testp
-                     '((test (coerce test 'function)))))
-         (declare (type index start1 start2 end1 end2))
-         (do (,(if from-end
-                   '(index2 (- end2 (- end1 start1)) (1- index2))
-                   '(index2 start2 (1+ index2))))
-             (,(if from-end
-                   '(< index2 start2)
-                   '(>= index2 end2))
-              nil)
-           ;; INDEX2 is FIXNUM, not an INDEX, as right before the loop
-           ;; terminates is hits -1 when :FROM-END is true and :START2
-           ;; is 0.
-           (declare (type fixnum index2))
-           (when (do ((index1 start1 (1+ index1))
-                      (index2 index2 (1+ index2)))
-                     ((>= index1 end1) t)
-                   (declare (type index index1 index2))
-                   ,@(unless from-end
-                             '((when (= index2 end2)
-                                 (return-from search nil))))
-                   (unless (,@(if testp
-                                  '(funcall test)
-                                  '(eql))
-                              ,(if keyp
-                                   '(funcall key (aref pattern index1))
-                                   '(aref pattern index1))
-                              ,(if keyp
-                                   '(funcall key (aref text index2))
-                                   '(aref text index2)))
-                     (return nil)))
-             (return index2)))))))
+       (flet ((oops (vector start end)
+                (sequence-bounding-indices-bad-error vector start end)))
+         (let* ((len1 (length pattern))
+                (len2 (length text))
+                (end1 (or end1 len1))
+                (end2 (or end2 len2))
+               ,@(when keyp
+                       '((key (coerce key 'function))))
+               ,@(when testp
+                       '((test (coerce test 'function)))))
+          (declare (type index start1 start2 end1 end2))
+          ,@(when check-bounds-p
+             `((unless (<= start1 end1 len1)
+                 (oops pattern start1 end1))
+               (unless (<= start2 end2 len2)
+                 (oops pattern start2 end2))))
+          (do (,(if from-end
+                    '(index2 (- end2 (- end1 start1)) (1- index2))
+                    '(index2 start2 (1+ index2))))
+              (,(if from-end
+                    '(< index2 start2)
+                    '(>= index2 end2))
+               nil)
+            ;; INDEX2 is FIXNUM, not an INDEX, as right before the loop
+            ;; terminates is hits -1 when :FROM-END is true and :START2
+            ;; is 0.
+            (declare (type fixnum index2))
+            (when (do ((index1 start1 (1+ index1))
+                       (index2 index2 (1+ index2)))
+                      ((>= index1 end1) t)
+                    (declare (type index index1 index2)
+                             (optimize (insert-array-bounds-checks 0)))
+                    ,@(unless from-end
+                              '((when (= index2 end2)
+                                  (return-from search nil))))
+                    (unless (,@(if testp
+                                   '(funcall test)
+                                   '(eql))
+                               ,(if keyp
+                                    '(funcall key (aref pattern index1))
+                                    '(aref pattern index1))
+                               ,(if keyp
+                                    '(funcall key (aref text index2))
+                                    '(aref text index2)))
+                      (return nil)))
+              (return index2))))))))
 
 
 ;;; Open-code CONCATENATE for strings. It would be possible to extend
                    (declare (type index index))
                    (dolist (i sequence
                             (if (and end (> end index))
-                                (sb!impl::signal-bounding-indices-bad-error
+                                (sequence-bounding-indices-bad-error
                                  sequence start end)
                                 (values find position)))
                      (let ((key-i (funcall key i)))