[git] CMU Common Lisp branch master updated. snapshot-2014-02-4-g8970ad1

[Raymond Toy]

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- Log -----------------------------------------------------------------
commit 8970ad11b03f863b40a9ee352d3aced52b783cce
Author: Raymond Toy <toy.raymond at gmail.com>
Date:   Sun Feb 9 09:53:11 2014 -0800

    Fix ticket:92
    
    Type derivation for log fixed to be consistent with the actual
    returned values.
    
     * src/compiler/float-tran.lisp:
       * Update {{{LOG-DERIVE-TYPE-AUX-1}}} to compute the correct type.
    
     * tests/trac.lisp:
       * Add test for trac ticket:92

diff --git a/src/compiler/float-tran.lisp b/src/compiler/float-tran.lisp
index 08ce90b..b856a6c 100644
--- a/src/compiler/float-tran.lisp
+++ b/src/compiler/float-tran.lisp
@@ -1494,11 +1494,15 @@
   (two-arg-derive-type x y #'expt-derive-type-aux #'expt))
 
 
-;;; Note must assume that a type including 0.0 may also include -0.0
-;;; and thus the result may be complex -infinity + i*pi.
-;;;
 (defun log-derive-type-aux-1 (x)
-  (elfun-derive-type-simple x #'log 0d0 nil nil nil))
+  (elfun-derive-type-simple x
+			    #'(lambda (z)
+				;; log(0) and log(-0) is -infinity.
+				;; Return NIL to indicate that.
+				(if (zerop z)
+				    nil
+				    (log z)))
+			    -0d0 nil nil nil))
 
 (defun log-derive-type-aux-2 (x y same-arg)
   (let ((log-x (log-derive-type-aux-1 x))
diff --git a/tests/trac.lisp b/tests/trac.lisp
index 3e23d3e..dfbbf8b 100644
--- a/tests/trac.lisp
+++ b/tests/trac.lisp
@@ -273,3 +273,13 @@
   ;; The following formats should not signal an error.
   (assert-true (ignore-errors (format nil "~ve" 21 5d-234)))
   (assert-true (ignore-errors (format nil "~ve" 100 5d-234))))
+
+(define-test trac.92
+  (:tag :trac)
+  (let ((f (compile nil
+		    #'(lambda (x)
+			(declare (type (double-float 0d0) x))
+			(log x)))))
+    (assert-equal
+     'double-float
+     (third (kernel:%function-type f)))))

-----------------------------------------------------------------------

Summary of changes:
 src/compiler/float-tran.lisp |   12 ++++++++----
 tests/trac.lisp              |   10 ++++++++++
 2 files changed, 18 insertions(+), 4 deletions(-)


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