[PATCH 4/5 v2] msvcr120: Add acosh.

[Alex Henrie]

 /*********************************************************************
+ *      acosh (MSVCR120.@)
+ */
+double CDECL MSVCR120_acosh(double x)
+{
+    if (x < 1) {
+        *MSVCRT__errno() = MSVCRT_EDOM;
+        return NAN;
+    }
+#ifdef HAVE_ACOSH
+    return acosh(x);
+#else
+    if (!isfinite(x*x)) return log(2) + log(x);
+    return log(x + sqrt(x*x-1));
+#endif
+}
+
+/*********************************************************************
+ *      acoshf (MSVCR120.@)
+ */
+float CDECL MSVCR120_acoshf(float x)
+{
+#ifdef HAVE_ACOSHF
+    return acoshf(x);
+#else
+    return MSVCR120_acosh(x);
+#endif
+}

Thanks for the help. Are you sure that acosh and atanh require bounds
checking, but acoshf and atanhf do not? Also, aren't they supposed to
set an exception flag if x is less than 1?

-Alex