0.8.10.9:

[sbcl.git] / src / compiler / generic / vm-type.lisp

diff --git a/src/compiler/generic/vm-type.lisp b/src/compiler/generic/vm-type.lisp
index a900222..e43b2d4 100644 (file)
--- a/src/compiler/generic/vm-type.lisp
+++ b/src/compiler/generic/vm-type.lisp
@@ -137,6 +137,27 @@
       (type-specifier (array-type-specialized-element-type
                       (specifier-type `(array ,spec))))))
 
+(defun sb!xc:upgraded-complex-part-type (spec &optional environment)
+  #!+sb-doc
+  "Return the element type of the most specialized COMPLEX number type that
+   can hold parts of type SPEC."
+  (declare (ignore environment))
+  (if (unknown-type-p (specifier-type spec))
+      (error "undefined type: ~S" spec)
+      (let ((ctype (specifier-type `(complex ,spec))))
+       (cond
+         ((eq ctype *empty-type*) '(eql 0))
+         ((csubtypep ctype (specifier-type '(complex single-float)))
+          'single-float)
+         ((csubtypep ctype (specifier-type '(complex double-float)))
+          'double-float)
+         #!+long-float
+         ((csubtypep ctype (specifier-type '(complex long-float)))
+          'long-float)
+         ((csubtypep ctype (specifier-type '(complex rational)))
+          'rational)
+         (t 'real)))))
+
 ;;; Return the most specific integer type that can be quickly checked that
 ;;; includes the given type.
 (defun containing-integer-type (subtype)