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- Log ----------------------------------------------------------------- commit 179e05df049f705f95eea224d1248ba5e979ce18 Author: Raymond Toy toy.raymond@gmail.com Date: Sat Mar 8 13:32:08 2014 -0800

Return the correct values for (log -0w0) and (log 0w0). Previously we returned something like #c(-715 pi) and -715.

* src/code/irrat-dd.lisp: * Handle -0w0 and 0w0 specially in dd-%log.

* tests/trac.lisp: * Add a test for this in trac.lisp.

diff --git a/src/code/irrat-dd.lisp b/src/code/irrat-dd.lisp index 29627b5..438339f 100644 --- a/src/code/irrat-dd.lisp +++ b/src/code/irrat-dd.lisp @@ -368,10 +368,17 @@ (optimize (speed 3) (space 0) (inhibit-warnings 3))) ;; Separate mantissa from exponent - (multiple-value-bind (x e) + (multiple-value-bind (x e sign) (decode-float x) (declare (type double-double-float x) (type double-float-exponent e)) + (when (zerop x) + ;; Handle log(+/-0). Return -inf or -inf + i*pi, but signal a + ;; division by zero. + (return-from dd-%log + (if (minusp sign) + (complex (/ (- x)) dd-pi) + (/ (- x))))) (let ((z 0w0) (y 0w0)) (declare (type double-double-float z y)) diff --git a/tests/trac.lisp b/tests/trac.lisp index f8b4258..9a02189 100644 --- a/tests/trac.lisp +++ b/tests/trac.lisp @@ -342,7 +342,10 @@ (ext:with-float-traps-masked (:divide-by-zero) (log -0d0))) (assert-equal (complex ext:single-float-negative-infinity (float pi 1f0)) - (ext:with-float-traps-masked (:divide-by-zero) (log -0f0))))) + (ext:with-float-traps-masked (:divide-by-zero) (log -0f0))) + (assert-equal + (complex ext:double-double-float-negative-infinity kernel:dd-pi) + (ext:with-float-traps-masked (:divide-by-zero) (log -0w0)))))

(define-test trac.93 (:tag :trac)

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Summary of changes: src/code/irrat-dd.lisp | 9 ++++++++- tests/trac.lisp | 5 ++++- 2 files changed, 12 insertions(+), 2 deletions(-)

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