;; boxing.
(rehash-threshold (float rehash-threshold 1.0))
(size+1 (1+ size)) ; The first element is not usable.
- (scaled-size (round (/ (float size+1) rehash-threshold)))
+ ;; KLUDGE: The most natural way of expressing the below is
+ ;; (round (/ (float size+1) rehash-threshold)), and indeed
+ ;; it was expressed like that until 0.7.0. However,
+ ;; MAKE-HASH-TABLE is called very early in cold-init, and
+ ;; the SPARC has no primitive instructions for rounding,
+ ;; but only for truncating; therefore, we fudge this issue
+ ;; a little. The other uses of truncate, below, similarly
+ ;; used to be round. -- CSR, 2002-10-01
+ ;;
+ ;; Note that this has not yet been audited for
+ ;; correctness. It just seems to work. -- CSR, 2002-11-02
+ (scaled-size (truncate (/ (float size+1) rehash-threshold)))
(length (almost-primify (max scaled-size
(1+ +min-hash-table-size+))))
(index-vector (make-array length
:hash-vector (unless (eq test 'eq)
(make-array size+1
:element-type '(unsigned-byte 32)
+ ;; as explained by pmai on
+ ;; openprojects #lisp IRC
+ ;; 2002-07-30: #x80000000 is
+ ;; bigger than any possible nonEQ
+ ;; hash value, and thus indicates
+ ;; an empty slot; and EQ hash
+ ;; tables don't use
+ ;; HASH-TABLE-HASH-VECTOR
:initial-element #x80000000)))))
(declare (type index size+1 scaled-size length))
;; Set up the free list, all free. These lists are 0 terminated.
(fixnum
(+ rehash-size old-size))
(float
- (the index (round (* rehash-size old-size)))))))
+ (the index (truncate (* rehash-size old-size)))))))
(new-kv-vector (make-array (* 2 new-size)
:initial-element +empty-ht-slot+))
(new-next-vector (make-array new-size
:initial-element #x80000000)))
(old-index-vector (hash-table-index-vector table))
(new-length (almost-primify
- (round (/ (float new-size)
+ (truncate (/ (float new-size)
(hash-table-rehash-threshold table)))))
(new-index-vector (make-array new-length
:element-type '(unsigned-byte 32)