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- Log ----------------------------------------------------------------- commit 3c136f7ca5106ab99c95ffbc18a2b8c70d007342 Author: Raymond Toy rtoy@google.com Date: Sun Nov 24 20:53:22 2013 -0800
Clean up rem-pi/2.
o Remove old version o Update new version to skip reduction if the arg <= pi/4.
diff --git a/qd-fun.lisp b/qd-fun.lisp index 91c0b32..b3ae7b6 100644 --- a/qd-fun.lisp +++ b/qd-fun.lisp @@ -783,23 +783,12 @@ is the cosine of A" (sub-qd f +qd-pi/2+))))))
(defun rem-pi/2 (a) - ;; If the number is small enough, we don't need to use the full - ;; precision algorithm to compute the remainder. The value of 1024 - ;; here is rather arbitrary. We should do an analysis to figure - ;; where the breakpoint should be. - (cond ((<= (abs (qd-0 a)) 256) - (let ((quot (truncate (qd-0 (nint-qd (div-qd a +qd-pi/2+)))))) - (values (mod quot 4) - (sub-qd a (mul-qd-d +qd-pi/2+ (float quot 1d0)))))) + "Compute qd rem pi/2 = k + f, where k is an integer and |f| < + pi/4. Two values are returned: k mod 4 and f." + (cond ((qd-<= (abs-qd a) +qd-pi/4+) + (values 0 a)) (t (rem-pi/2-int a)))) - -(defun rem-pi/2 (a) - ;; If the number is small enough, we don't need to use the full - ;; precision algorithm to compute the remainder. The value of 1024 - ;; here is rather arbitrary. We should do an analysis to figure - ;; where the breakpoint should be. - (rem-pi/2-int a))
(defun sin-qd (a)
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Summary of changes: qd-fun.lisp | 19 ++++--------------- 1 file changed, 4 insertions(+), 15 deletions(-)
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