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authorUlrich Drepper <drepper@redhat.com>1996-08-30 00:58:28 +0000
committerUlrich Drepper <drepper@redhat.com>1996-08-30 00:58:28 +0000
commit6e953631df4b716fcf2d2bcfb62e44ffba2a6b40 (patch)
treea7258ce3689b120b270f0bedda5806092660774c /sysdeps/libm-ieee754/s_tanhl.c
parent747e2b436143d80406e21f647f7ba9837f73a173 (diff)
downloadglibc-6e953631df4b716fcf2d2bcfb62e44ffba2a6b40.tar.gz
update from main archive 960829cvs/libc-960830
Fri Aug 30 01:26:44 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/i386/Dist: Add close.S. * sysdeps/unix/sysv/linux/m68k/Dist: Likewise. * sysdeps/unix/sysv/linux/alpha/Dist: Likewise. * version.c: Add comment about where to report bugs to. * catgets/gencat.c (usage): Likewise. * db/makedb.c (usage): Likewise. * locale/programs/locale.c (usage): Likewise. * locale/programs/localedef.c (usage): Likewise. * manual/socket.texi: A little bit better wording. Thu Aug 29 18:03:06 1996 Ulrich Drepper <drepper@cygnus.com> * Makerules: Make sure directory exists before generating stamp file. (BUILD_CFLAGS): Always refer to using $(..). * manual/Makefile: Make sure directory exists before generating stamp file. (make-target-directory): Add macro definition. * sysdeps/generic/Makefile: Make sure directory exists before generating stamp file. * Makefile (distribute): Add autolock.sh. Reported by Fila Kolodny. Tue Aug 27 10:06:22 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> When compiling in separate directory put objects into subdirectories matching the source layout. * Makeconfig (objpfx) [ifdef objdir]: Append $(subdir). When looking for configparms try in $(common-objpfx). Use $(common-objpfx)SUBDIR to find objects from other subdirectory builds. * Makerules: Add $(objpfx) to vpath list. (make-dummy-dep): Use $(common-objpfx) to avoid creating dummy.d more than once. All uses in dependency lists changed. (+make-deps): Make target directory. (sed-remove-objpfx): Substitute $(common-objpfx). (do-ar, build-extra-lib, $(common-objpfx)stub-$(subdir)): Use $(objpfx) instead of $(objdir) for cd command. (O%-lib): Always find libc relative to $(..). (subdir-stamps): Collect stamp files from subdirs. (common-mostlyclean): Remove stub file in $(common-objpfx). * MakeTAGS ($P/siglist.pot): Find siglist.c in stdio-common. * Rules (dep-dummy-lib): Use $(common-objpfx) to avoid creating to more than once. ($(objpfx)dummy.c, $(objpfx)empty.c): Change target name to use $(common-objfpx). All uses in dependency lists changed. (generated): Prepend $(..) to names. * bare/Makefile ($(objpfx)lib$(config-vendor).a): Remove $(objpfx) from $@. * nss/Makefile ($(objpfx)libnss_dns.so, $(objpfx)libnss_db.so): Use $(common-objpfx) instead of $(..) in dependencies. * sysdeps/mach/Makefile (mach-objpfx): Unconditionally use $(common-objpfx) instead of $(..) and (objpfx). * sysdeps/mach/hurd/Makefile (hurd-objpfx): Likewise. (rpath-link): Likewise. (rpcuserlibs): Likewise. * sysdeps/unix/Makefile [$(subdir) = stdio-common]: Check for errlist.c in $(objpfx), not $(common-objpfx). ($(common-objpfx)s-proto.d): Special rule not covered by pattern rule. * sysdeps/unix/make-syscalls.sh: Make syscall rules depending on s-proto.d in $(common-objpfx), not $(objpfx). Thu Aug 29 17:45:49 1996 Ulrich Drepper <drepper@cygnus.com> * nss/nsswitch.c (nss_dlerror_run): Free returned error string. Thu Aug 29 15:53:33 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/libm-ieee754/e_acoshl.c: New file. `long double' implementation. * sysdeps/libm-ieee754/e_atanhl.c: Likewise. * sysdeps/libm-ieee754/e_remainderl.c: Likewise. * sysdeps/libm-ieee754/e_scalbl.c: Likewise. * sysdeps/libm-ieee754/s_asinhl.c: Likewise. * sysdeps/libm-ieee754/s_cosl.c: Likewise. * sysdeps/libm-ieee754/s_sinl.c: Likewise. * sysdeps/libm-ieee754/s_tanhl.c: Likewise. * sysdeps/libm-ieee754/s_tanl.c: Likewise. * stdio-common/printf_fp.c (__printf_fp): Use default value '.' if
Diffstat (limited to 'sysdeps/libm-ieee754/s_tanhl.c')
-rw-r--r--sysdeps/libm-ieee754/s_tanhl.c91
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diff --git a/sysdeps/libm-ieee754/s_tanhl.c b/sysdeps/libm-ieee754/s_tanhl.c
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+/* s_tanhl.c -- long double version of s_tanh.c.
+ * Conversion to long double by Ulrich Drepper,
+ * Cygnus Support, drepper@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: $";
+#endif
+
+/* tanhl(x)
+ * Return the Hyperbolic Tangent of x
+ *
+ * Method :
+ * x -x
+ * e - e
+ * 0. tanhl(x) is defined to be -----------
+ * x -x
+ * e + e
+ * 1. reduce x to non-negative by tanhl(-x) = -tanhl(x).
+ * 2. 0 <= x <= 2**-55 : tanhl(x) := x*(one+x)
+ * -t
+ * 2**-55 < x <= 1 : tanhl(x) := -----; t = expm1l(-2x)
+ * t + 2
+ * 2
+ * 1 <= x <= 23.0 : tanhl(x) := 1- ----- ; t=expm1l(2x)
+ * t + 2
+ * 23.0 < x <= INF : tanhl(x) := 1.
+ *
+ * Special cases:
+ * tanhl(NaN) is NaN;
+ * only tanhl(0)=0 is exact for finite argument.
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+static const long double one=1.0, two=2.0, tiny = 1.0e-16380L;
+#else
+static long double one=1.0, two=2.0, tiny = 1.0e-16380L;
+#endif
+
+#ifdef __STDC__
+ long double __tanhl(long double x)
+#else
+ long double __tanhl(x)
+ long double x;
+#endif
+{
+ long double t,z;
+ int32_t se,j0,j1,ix;
+
+ /* High word of |x|. */
+ GET_LDOUBLE_WORDS(se,j0,j1,x);
+ ix = se&0x7fff;
+
+ /* x is INF or NaN */
+ if(ix==0x7fff) {
+ if (se>=0x7fff) return one/x+one; /* tanhl(+-inf)=+-1 */
+ else return one/x-one; /* tanhl(NaN) = NaN */
+ }
+
+ /* |x| < 23 */
+ if (ix < 0x4003 || (ix == 0x4003 && j0 < 0xb8000000)) { /* |x|<23 */
+ if (ix<0x3fc8) /* |x|<2**-55 */
+ return x*(one+x); /* tanh(small) = small */
+ if (ix>=0x3fff) { /* |x|>=1 */
+ t = __expm1l(two*fabsl(x));
+ z = one - two/(t+two);
+ } else {
+ t = __expm1l(-two*fabsl(x));
+ z= -t/(t+two);
+ }
+ /* |x| > 23, return +-1 */
+ } else {
+ z = one - tiny; /* raised inexact flag */
+ }
+ return (se>0x7fff)? z: -z;
+}
+weak_alias (__tanhl, tanhl)