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* Makeconfig ($(common-objpfx)config.make): Depend on config.h.in. Mon Mar 4 17:35:09 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * hurd/catch-signal.c (hurd_safe_memmove): New function. (hurd_safe_copyin, hurd_safe_copyout): New functions. * hurd/hurd/sigpreempt.h: Declare them. Sun Mar 3 08:43:44 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> Replace math code with fdlibm from Sun as modified for netbsd by JT Conklin and Ian Taylor, including x86 FPU support. * sysdeps/libm-ieee754, sysdeps/libm-i387: New directories. * math/math_private.h: New file. * sysdeps/i386/fpu/Implies: New file. * sysdeps/ieee754/Implies: New file. * math/machine/asm.h, math/machine/endian.h: New files. * math/Makefile, math/math.h: Rewritten. * mathcalls.h, math/mathcalls.h: New file, broken out of math.h. * math/finite.c: File removed. * sysdeps/generic/Makefile [$(subdir)=math]: Frobnication removed. * math/test-math.c: Include errno.h and string.h. * sysdeps/unix/bsd/dirstream.h: File removed. * sysdeps/unix/bsd/readdir.c: File removed.
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/* s_tanhf.c -- float version of s_tanh.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#if defined(LIBM_SCCS) && !defined(lint)
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static char rcsid[] = "$NetBSD: s_tanhf.c,v 1.4 1995/05/10 20:48:24 jtc Exp $";
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#endif
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#include "math.h"
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#include "math_private.h"
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#ifdef __STDC__
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static const float one=1.0, two=2.0, tiny = 1.0e-30;
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#else
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static float one=1.0, two=2.0, tiny = 1.0e-30;
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#endif
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#ifdef __STDC__
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float __tanhf(float x)
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#else
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float __tanhf(x)
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float x;
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#endif
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{
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float t,z;
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int32_t jx,ix;
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GET_FLOAT_WORD(jx,x);
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ix = jx&0x7fffffff;
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/* x is INF or NaN */
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if(ix>=0x7f800000) {
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if (jx>=0) return one/x+one; /* tanh(+-inf)=+-1 */
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else return one/x-one; /* tanh(NaN) = NaN */
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}
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/* |x| < 22 */
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if (ix < 0x41b00000) { /* |x|<22 */
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if (ix<0x24000000) /* |x|<2**-55 */
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return x*(one+x); /* tanh(small) = small */
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if (ix>=0x3f800000) { /* |x|>=1 */
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t = __expm1f(two*fabsf(x));
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z = one - two/(t+two);
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} else {
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t = __expm1f(-two*fabsf(x));
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z= -t/(t+two);
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}
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/* |x| > 22, return +-1 */
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} else {
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z = one - tiny; /* raised inexact flag */
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}
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return (jx>=0)? z: -z;
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}
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weak_alias (__tanhf, tanhf)
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