;; They must both be positive.
(cond ((or (null x-len) (null y-len))
(specifier-type 'unsigned-byte))
- ((or (zerop x-len) (zerop y-len))
- (specifier-type '(integer 0 0)))
(t
- (specifier-type `(unsigned-byte ,(min x-len y-len)))))
+ (specifier-type `(unsigned-byte* ,(min x-len y-len)))))
;; X is positive, but Y might be negative.
(cond ((null x-len)
(specifier-type 'unsigned-byte))
- ((zerop x-len)
- (specifier-type '(integer 0 0)))
(t
- (specifier-type `(unsigned-byte ,x-len)))))
+ (specifier-type `(unsigned-byte* ,x-len)))))
;; X might be negative.
(if (not y-neg)
;; Y must be positive.
(cond ((null y-len)
(specifier-type 'unsigned-byte))
- ((zerop y-len)
- (specifier-type '(integer 0 0)))
- (t
- (specifier-type
- `(unsigned-byte ,y-len))))
+ (t (specifier-type `(unsigned-byte* ,y-len))))
;; Either might be negative.
(if (and x-len y-len)
;; The result is bounded.
(cond
((and (not x-neg) (not y-neg))
;; Both are positive.
- (if (and x-len y-len (zerop x-len) (zerop y-len))
- (specifier-type '(integer 0 0))
- (specifier-type `(unsigned-byte ,(if (and x-len y-len)
- (max x-len y-len)
- '*)))))
+ (specifier-type `(unsigned-byte* ,(if (and x-len y-len)
+ (max x-len y-len)
+ '*))))
((not x-pos)
;; X must be negative.
(if (not y-pos)
(and (not x-pos) (not y-pos)))
;; Either both are negative or both are positive. The result
;; will be positive, and as long as the longer.
- (if (and x-len y-len (zerop x-len) (zerop y-len))
- (specifier-type '(integer 0 0))
- (specifier-type `(unsigned-byte ,(if (and x-len y-len)
- (max x-len y-len)
- '*)))))
+ (specifier-type `(unsigned-byte* ,(if (and x-len y-len)
+ (max x-len y-len)
+ '*))))
((or (and (not x-pos) (not y-neg))
(and (not y-neg) (not y-pos)))
;; Either X is negative and Y is positive of vice-versa. The
(csubtypep size (specifier-type 'integer)))
(let ((size-high (numeric-type-high size)))
(if (and size-high (<= size-high sb!vm:n-word-bits))
- (specifier-type `(unsigned-byte ,size-high))
+ (specifier-type `(unsigned-byte* ,size-high))
(specifier-type 'unsigned-byte)))
*universal-type*)))
(posn-high (numeric-type-high posn)))
(if (and size-high posn-high
(<= (+ size-high posn-high) sb!vm:n-word-bits))
- (specifier-type `(unsigned-byte ,(+ size-high posn-high)))
+ (specifier-type `(unsigned-byte* ,(+ size-high posn-high)))
(specifier-type 'unsigned-byte)))
*universal-type*)))
-(defoptimizer (%dpb derive-type) ((newbyte size posn int))
+(defun %deposit-field-derive-type-aux (size posn int)
(let ((size (continuation-type size))
(posn (continuation-type posn))
(int (continuation-type int)))
- (if (and (numeric-type-p size)
- (csubtypep size (specifier-type 'integer))
- (numeric-type-p posn)
- (csubtypep posn (specifier-type 'integer))
- (numeric-type-p int)
- (csubtypep int (specifier-type 'integer)))
- (let ((size-high (numeric-type-high size))
- (posn-high (numeric-type-high posn))
- (high (numeric-type-high int))
- (low (numeric-type-low int)))
- (if (and size-high posn-high high low
- (<= (+ size-high posn-high) sb!vm:n-word-bits))
- (specifier-type
- (list (if (minusp low) 'signed-byte 'unsigned-byte)
- (max (integer-length high)
- (integer-length low)
- (+ size-high posn-high))))
- *universal-type*))
- *universal-type*)))
+ (when (and (numeric-type-p size)
+ (numeric-type-p posn)
+ (numeric-type-p int))
+ (let ((size-high (numeric-type-high size))
+ (posn-high (numeric-type-high posn))
+ (high (numeric-type-high int))
+ (low (numeric-type-low int)))
+ (when (and size-high posn-high high low
+ ;; KLUDGE: we need this cutoff here, otherwise we
+ ;; will merrily derive the type of %DPB as
+ ;; (UNSIGNED-BYTE 1073741822), and then attempt to
+ ;; canonicalize this type to (INTEGER 0 (1- (ASH 1
+ ;; 1073741822))), with hilarious consequences. We
+ ;; cutoff at 4*SB!VM:N-WORD-BITS to allow inference
+ ;; over a reasonable amount of shifting, even on
+ ;; the alpha/32 port, where N-WORD-BITS is 32 but
+ ;; machine integers are 64-bits. -- CSR,
+ ;; 2003-09-12
+ (<= (+ size-high posn-high) (* 4 sb!vm:n-word-bits)))
+ (let ((raw-bit-count (max (integer-length high)
+ (integer-length low)
+ (+ size-high posn-high))))
+ (specifier-type
+ (if (minusp low)
+ `(signed-byte ,(1+ raw-bit-count))
+ `(unsigned-byte* ,raw-bit-count)))))))))
+
+(defoptimizer (%dpb derive-type) ((newbyte size posn int))
+ (%deposit-field-derive-type-aux size posn int))
(defoptimizer (%deposit-field derive-type) ((newbyte size posn int))
- (let ((size (continuation-type size))
- (posn (continuation-type posn))
- (int (continuation-type int)))
- (if (and (numeric-type-p size)
- (csubtypep size (specifier-type 'integer))
- (numeric-type-p posn)
- (csubtypep posn (specifier-type 'integer))
- (numeric-type-p int)
- (csubtypep int (specifier-type 'integer)))
- (let ((size-high (numeric-type-high size))
- (posn-high (numeric-type-high posn))
- (high (numeric-type-high int))
- (low (numeric-type-low int)))
- (if (and size-high posn-high high low
- (<= (+ size-high posn-high) sb!vm:n-word-bits))
- (specifier-type
- (list (if (minusp low) 'signed-byte 'unsigned-byte)
- (max (integer-length high)
- (integer-length low)
- (+ size-high posn-high))))
- *universal-type*))
- *universal-type*)))
+ (%deposit-field-derive-type-aux size posn int))
(deftransform %ldb ((size posn int)
(fixnum fixnum integer)
projects / sbcl.git / blobdiff