X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2F__invtrigl.c;h=f2d33d3e5314fc458164b080d28c5a05deec6096;hb=72768ea99e67162b7b42d9cd8917cf9a2c00f1f1;hp=a51330e22a0224d021c53ae170a4fcdcbfe41155;hpb=8bb181622222f2ee3462c8b021bcae4fcdbbd37a;p=musl

diff --git a/src/math/__invtrigl.c b/src/math/__invtrigl.c
index a51330e2..f2d33d3e 100644
--- a/src/math/__invtrigl.c
+++ b/src/math/__invtrigl.c
@@ -1,36 +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
 
-/* coefficients used in asinl() and acosl() */
-const long double
+static const long double
 pS0 =  1.66666666666666666631e-01L,
 pS1 = -4.16313987993683104320e-01L,
 pS2 =  3.69068046323246813704e-01L,
@@ -44,9 +16,16 @@ qS3 = -1.68285799854822427013e+00L,
 qS4 =  3.90699412641738801874e-01L,
 qS5 = -3.14365703596053263322e-02L;
 
-const long double pi_hi = 3.1415926535897932384626433832795L;
-const long double pi_lo = -5.01655761266833202345e-20L;
 const long double pio2_hi = 1.57079632679489661926L;
 const long double pio2_lo = -2.50827880633416601173e-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