X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Fcode%2Firrat.lisp;h=5f901c910233db1e52550551e29bae529234b101;hb=b6ed0e20d468099b62d27095db7d18f76d8886d2;hp=0f2b7a321a424d09d40a6c5efdbbe79e48209423;hpb=6349f899f37ca9807461e67cb5e2f8b8bd3beba6;p=sbcl.git

diff --git a/src/code/irrat.lisp b/src/code/irrat.lisp
index 0f2b7a3..5f901c9 100644
--- a/src/code/irrat.lisp
+++ b/src/code/irrat.lisp
@@ -76,10 +76,30 @@
 #!-x86 (def-math-rtn "atan2" 2)
 (def-math-rtn "sinh" 1)
 (def-math-rtn "cosh" 1)
-#!-win32(def-math-rtn "tanh" 1)
-#!-win32(def-math-rtn "asinh" 1)
-#!-win32(def-math-rtn "acosh" 1)
-#!-win32(def-math-rtn "atanh" 1)
+#!-win32
+(progn
+  (def-math-rtn "tanh" 1)
+  (def-math-rtn "asinh" 1)
+  (def-math-rtn "acosh" 1)
+  (def-math-rtn "atanh" 1))
+#!+win32
+(progn
+  (declaim (inline %tanh))
+  (defun %tanh (number)
+    (/ (%sinh number) (%cosh number)))
+  (declaim (inline %asinh))
+  (defun %asinh (number)
+    (log (+ number (sqrt (+ (* number number) 1.0d0))) #.(exp 1.0d0)))
+  (declaim (inline %acosh))
+  (defun %acosh (number)
+    (log (+ number (sqrt (- (* number number) 1.0d0))) #.(exp 1.0d0)))
+  (declaim (inline %atanh))
+  (defun %atanh (number)
+    (let ((ratio (/ (+ 1 number) (- 1 number))))
+      ;; Were we effectively zero?
+      (if (= ratio -1.0d0)
+          0.0d0
+          (/ (log ratio #.(exp 1.0d0)) 2.0d0)))))
 
 ;;; exponential and logarithmic
 #!-x86 (def-math-rtn "exp" 1)