Raymond Toy pushed to branch master at cmucl / cmucl
Commits: aeff3c51 by Raymond Toy at 2015-12-19T09:55:25Z Add cosh tests.
- - - - -
1 changed file:
- tests/fdlibm.lisp
Changes:
===================================== tests/fdlibm.lisp ===================================== --- a/tests/fdlibm.lisp +++ b/tests/fdlibm.lisp @@ -332,4 +332,33 @@ ;; There's no guarantee that atanh(3/4) = log(7)2 in floating ;; point, but it's true in this case with fdlibm (assert-eql (/ (log 7d0) 2) (atanh x)))) - \ No newline at end of file + +(define-test cosh-basic-tests + (:tag :fdlibm) + ;; cosh(2^-55) = 1, tiny x case + (let ((x (scale-float 1d0 -55))) + (assert-eql 1d0 (cosh x)) + (assert-eql 1d0 (cosh (- x)))) + ;; cosh(2^-55) = 1, tiny x case + (let ((x (scale-float 1d0 -56))) + (assert-eql 1d0 (cosh x)) + (assert-eql 1d0 (cosh (- x)))) + ;; cosh(log(2)/4) = (sqrt(2) + 1)/2^(5/4), case |x| < log(2)/2 + (let ((x (/ (log 2d0) 4))) + ;; This depends on (/ (log 2d0) 4) producing the value we really + ;; want as the arg. + (assert-eql 1.0150517651282178d0 (cosh x)) + (assert-eql 1.0150517651282178d0 (cosh (- x)))) + ;; cosh(10*log(2)) = 1048577/2048, case log(2)/2 < |x| < 22 + (let ((x (* 10 (log 2d0))) + (y (float 1048577/2048 1d0))) + (assert-eql y (cosh x)) + (assert-eql y (cosh (- x)))) + ;; cosh(32*log(2)), case 22 <= |x| < log(maxdouble) + (let ((x (* 32 (log 2d0)))) + (assert-eql 2.1474836479999983d9 (cosh x)) + (assert-eql 2.1474836479999983d9 (cosh (- x)))) + ;; cosh(710.4758600739439), case log(maxdouble) <= |x| <= overflowthreshold + (let ((x 710.4758600739439d0)) + (assert-eql 1.7976931348621744d308 (cosh x)) + (assert-eql 1.7976931348621744d308 (cosh (- x)))))
View it on GitLab: https://gitlab.common-lisp.net/cmucl/cmucl/commit/aeff3c51eb1c62e21b4ca9a86f...