[git] CMU Common Lisp branch master updated. snapshot-2014-08-33-gdf548f6

[Raymond Toy]

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- Log -----------------------------------------------------------------
commit df548f6e69bc4fa0aec3825d10074135c9e4ac03
Author: Raymond Toy <toy.raymond at gmail.com>
Date:   Tue Aug 26 19:07:54 2014 -0700

    Oops. Fix mistake in handling underflow for %exp.
    
     * src/lisp/e_exp.c:
       * Signal underflow instead of returning the arg.
     * tests/trig.lisp:
       * Add tests for %exp when exp underflows.

diff --git a/src/lisp/e_exp.c b/src/lisp/e_exp.c
index 034c590..93b638e 100644
--- a/src/lisp/e_exp.c
+++ b/src/lisp/e_exp.c
@@ -142,7 +142,10 @@ P5   =  4.13813679705723846039e-08; /* 0x3E663769, 0x72BEA4D0 */
                 return fdlibm_setexception(x, FDLIBM_OVERFLOW);
             }
             
-	    if(x < u_threshold) return x; /* underflow */
+	    if(x < u_threshold) {
+		/* underflow */
+		return fdlibm_setexception(0.0, FDLIBM_UNDERFLOW);
+	    }
 	}
 
     /* argument reduction */
diff --git a/tests/trig.lisp b/tests/trig.lisp
index 724fabe..cfd7ea2 100644
--- a/tests/trig.lisp
+++ b/tests/trig.lisp
@@ -945,9 +945,18 @@
 		(kernel:%exp *snan*))
   (assert-equal ext:double-float-positive-infinity
 		(kernel:%exp ext:double-float-positive-infinity))
+  (assert-equal 0d0
+		(kernel:%exp -1000d0))
   (kernel::with-float-traps-masked (:overflow)
     (assert-equal ext:double-float-positive-infinity
-		  (kernel:%exp 710d0))))
+		  (kernel:%exp 710d0)))
+  (let ((modes (ext:get-floating-point-modes)))
+    (unwind-protect
+	 (progn
+	   (ext:set-floating-point-modes :traps '(:underflow))
+	   (assert-error 'floating-point-underflow
+			 (kernel:%exp -1000d0)))
+      (apply #'ext:set-floating-point-modes modes))))
 
 (define-test %log.exception
   (:tag :fdlibm)

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

Summary of changes:
 src/lisp/e_exp.c |    5 ++++-
 tests/trig.lisp  |   11 ++++++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)


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