- (defun ,aux-name (num)
- ;; When converting a number to a float, the limits are
- ;; the same.
- (let* ((lo (bound-func (lambda (x)
- (coerce x ',type))
- (numeric-type-low num)))
- (hi (bound-func (lambda (x)
- (coerce x ',type))
- (numeric-type-high num))))
- (specifier-type `(,',type ,(or lo '*) ,(or hi '*)))))
-
- (defoptimizer (,fun derive-type) ((num))
- (one-arg-derive-type num #',aux-name #',fun))))))
- (frob %single-float single-float)
- (frob %double-float double-float))
+ (defun ,aux-name (num)
+ ;; When converting a number to a float, the limits are
+ ;; the same.
+ (let* ((lo (bound-func (lambda (x)
+ (if (< x ,most-negative)
+ ,most-negative
+ (coerce x ',type)))
+ (numeric-type-low num)))
+ (hi (bound-func (lambda (x)
+ (if (< ,most-positive x )
+ ,most-positive
+ (coerce x ',type)))
+ (numeric-type-high num))))
+ (specifier-type `(,',type ,(or lo '*) ,(or hi '*)))))
+
+ (defoptimizer (,fun derive-type) ((num))
+ (handler-case
+ (one-arg-derive-type num #',aux-name #',fun)
+ (type-error ()
+ nil)))))))
+ (frob %single-float single-float
+ most-negative-single-float most-positive-single-float)
+ (frob %double-float double-float
+ most-negative-double-float most-positive-double-float))