fix iconv conversion to legacy 8bit codepages

[musl] / src / math / __invtrigl.c

diff --git a/src/math/__invtrigl.c b/src/math/__invtrigl.c
index a821842..f2d33d3 100644 (file)
--- a/src/math/__invtrigl.c
+++ b/src/math/__invtrigl.c
@@ -1,37 +1,8 @@
-/* origin: FreeBSD /usr/src/lib/msun/src/ld80/invtrig.c */
-/*-
- * Copyright (c) 2008 David Schultz <das@FreeBSD.ORG>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
 #include "__invtrigl.h"
 
 #if LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
-/*
- * asinl() and acosl()
- */
-const long double
+
+static const long double
 pS0 =  1.66666666666666666631e-01L,
 pS1 = -4.16313987993683104320e-01L,
 pS2 =  3.69068046323246813704e-01L,
@@ -45,38 +16,16 @@ qS3 = -1.68285799854822427013e+00L,
 qS4 =  3.90699412641738801874e-01L,
 qS5 = -3.14365703596053263322e-02L;
 
-/*
- * atanl()
- */
-const long double atanhi[] = {
-        4.63647609000806116202e-01L,
-        7.85398163397448309628e-01L,
-        9.82793723247329067960e-01L,
-        1.57079632679489661926e+00L,
-};
-
-const long double atanlo[] = {
-        1.18469937025062860669e-20L,
-       -1.25413940316708300586e-20L,
-        2.55232234165405176172e-20L,
-       -2.50827880633416601173e-20L,
-};
-
-const long double aT[] = {
-        3.33333333333333333017e-01L,
-       -1.99999999999999632011e-01L,
-        1.42857142857046531280e-01L,
-       -1.11111111100562372733e-01L,
-        9.09090902935647302252e-02L,
-       -7.69230552476207730353e-02L,
-        6.66661718042406260546e-02L,
-       -5.88158892835030888692e-02L,
-        5.25499891539726639379e-02L,
-       -4.70119845393155721494e-02L,
-        4.03539201366454414072e-02L,
-       -2.91303858419364158725e-02L,
-        1.24822046299269234080e-02L,
-};
+const long double pio2_hi = 1.57079632679489661926L;
+const long double pio2_lo = -2.50827880633416601173e-20L;
 
-const long double pi_lo = -5.01655761266833202345e-20L;
+/* used in asinl() and acosl() */
+/* R(x^2) is a rational approximation of (asin(x)-x)/x^3 with Remez algorithm */
+long double __invtrigl_R(long double z)
+{
+       long double p, q;
+       p = z*(pS0+z*(pS1+z*(pS2+z*(pS3+z*(pS4+z*(pS5+z*pS6))))));
+       q = 1.0+z*(qS1+z*(qS2+z*(qS3+z*(qS4+z*qS5))));
+       return p/q;
+}
 #endif