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authorUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
committerUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
commitabfbdde177c3a7155070dda1b2cdc8292054cc26 (patch)
treee021306b596381fbf8311d2b7eb294e918ff17c8 /sysdeps/libm-ieee754/e_acoshl.c
parent86421aa57ecfd70963ae66848bd6a6dd3b8e0fe6 (diff)
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Update.
Diffstat (limited to 'sysdeps/libm-ieee754/e_acoshl.c')
-rw-r--r--sysdeps/libm-ieee754/e_acoshl.c72
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diff --git a/sysdeps/libm-ieee754/e_acoshl.c b/sysdeps/libm-ieee754/e_acoshl.c
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--- a/sysdeps/libm-ieee754/e_acoshl.c
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@@ -1,72 +0,0 @@
-/* e_acoshl.c -- long double version of e_acosh.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
-
-/* __ieee754_acoshl(x)
- * Method :
- * Based on
- * acoshl(x) = logl [ x + sqrtl(x*x-1) ]
- * we have
- * acoshl(x) := logl(x)+ln2, if x is large; else
- * acoshl(x) := logl(2x-1/(sqrtl(x*x-1)+x)) if x>2; else
- * acoshl(x) := log1pl(t+sqrtl(2.0*t+t*t)); where t=x-1.
- *
- * Special cases:
- * acoshl(x) is NaN with signal if x<1.
- * acoshl(NaN) is NaN without signal.
- */
-
-#include "math.h"
-#include "math_private.h"
-
-#ifdef __STDC__
-static const long double
-#else
-static long double
-#endif
-one = 1.0,
-ln2 = 6.931471805599453094287e-01L; /* 0x3FFE, 0xB17217F7, 0xD1CF79AC */
-
-#ifdef __STDC__
- long double __ieee754_acoshl(long double x)
-#else
- long double __ieee754_acoshl(x)
- long double x;
-#endif
-{
- long double t;
- u_int32_t se,i0,i1;
- GET_LDOUBLE_WORDS(se,i0,i1,x);
- if(se<0x3fff || se & 0x8000) { /* x < 1 */
- return (x-x)/(x-x);
- } else if(se >=0x401b) { /* x > 2**28 */
- if(se >=0x7fff) { /* x is inf of NaN */
- return x+x;
- } else
- return __ieee754_logl(x)+ln2; /* acoshl(huge)=logl(2x) */
- } else if(((se-0x3fff)|i0|i1)==0) {
- return 0.0; /* acosh(1) = 0 */
- } else if (se > 0x4000) { /* 2**28 > x > 2 */
- t=x*x;
- return __ieee754_logl(2.0*x-one/(x+__ieee754_sqrtl(t-one)));
- } else { /* 1<x<2 */
- t = x-one;
- return __log1pl(t+__sqrtl(2.0*t+t*t));
- }
-}