0.8.8.30:

[sbcl.git] / src / code / loop.lisp

diff --git a/src/code/loop.lisp b/src/code/loop.lisp
index 2a5eba4..acabbf6 100644 (file)
--- a/src/code/loop.lisp
+++ b/src/code/loop.lisp
@@ -928,12 +928,12 @@ code to be loaded.
 \f
 ;;;; loop types
 
-(defun loop-typed-init (data-type)
+(defun loop-typed-init (data-type &optional step-var-p)
   (when (and data-type (sb!xc:subtypep data-type 'number))
     (if (or (sb!xc:subtypep data-type 'float)
            (sb!xc:subtypep data-type '(complex float)))
-       (coerce 0 data-type)
-       0)))
+       (coerce (if step-var-p 1 0) data-type)
+       (if step-var-p 1 0))))
 
 (defun loop-optional-type (&optional variable)
   ;; No variable specified implies that no destructuring is permissible.
@@ -1024,7 +1024,7 @@ code to be loaded.
       ((null entry) (return nil))
       ((assoc name (caar entry) :test #'eq) (return t)))))
 
-(defun loop-make-var (name initialization dtype &optional iteration-var-p)
+(defun loop-make-var (name initialization dtype &optional iteration-var-p step-var-p)
   (cond ((null name)
         (setq name (gensym "LOOP-IGNORE-"))
         (push (list name initialization) *loop-vars*)
@@ -1041,10 +1041,10 @@ code to be loaded.
                            name)))
         (unless (symbolp name)
           (loop-error "bad variable ~S somewhere in LOOP" name))
-        (loop-declare-var name dtype)
+        (loop-declare-var name dtype step-var-p)
         ;; We use ASSOC on this list to check for duplications (above),
         ;; so don't optimize out this list:
-        (push (list name (or initialization (loop-typed-init dtype)))
+        (push (list name (or initialization (loop-typed-init dtype step-var-p)))
               *loop-vars*))
        (initialization
         (let ((newvar (gensym "LOOP-DESTRUCTURE-")))
@@ -1063,11 +1063,11 @@ code to be loaded.
 (defun loop-make-iteration-var (name initialization dtype)
   (loop-make-var name initialization dtype t))
 
-(defun loop-declare-var (name dtype)
+(defun loop-declare-var (name dtype &optional step-var-p)
   (cond ((or (null name) (null dtype) (eq dtype t)) nil)
        ((symbolp name)
         (unless (sb!xc:subtypep t dtype)
-          (let ((dtype (let ((init (loop-typed-init dtype)))
+          (let ((dtype (let ((init (loop-typed-init dtype step-var-p)))
                          (if (sb!xc:typep init dtype)
                              dtype
                              `(or (member ,init) ,dtype)))))
@@ -1700,7 +1700,7 @@ code to be loaded.
         (limit-value nil)
         )
      (flet ((assert-index-for-arithmetic (index)
-             (unless (atom indexv)
+             (unless (atom index)
                (loop-error "Arithmetic index must be an atom."))))
        (when variable (loop-make-iteration-var variable nil variable-type))
        (do ((l prep-phrases (cdr l)) (prep) (form) (odir)) ((null l))
@@ -1742,7 +1742,8 @@ code to be loaded.
            (unless stepby-constantp
              (loop-make-var (setq stepby (gensym "LOOP-STEP-BY-"))
                 form
-                `(and ,indexv-type (real (0))))))
+                `(and ,indexv-type (real (0)))
+                nil t)))
           (t (loop-error
                 "~S invalid preposition in sequencing or sequence path;~@
              maybe invalid prepositions were specified in iteration path descriptor?"