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8db3cdefef
Similar to various other bugs in this area, some asinh implementations do not raise the underflow exception for subnormal arguments, when the result is tiny and inexact. This patch forces the exception in a similar way to previous fixes. Tested for x86_64, x86 and mips64. [BZ #16350] * sysdeps/i386/fpu/s_asinh.S (__asinh): Force underflow exception for arguments with small absolute value. * sysdeps/i386/fpu/s_asinhf.S (__asinhf): Likewise. * sysdeps/i386/fpu/s_asinhl.S (__asinhl): Likewise. * sysdeps/ieee754/dbl-64/s_asinh.c: Include <float.h>. (__asinh): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/flt-32/s_asinhf.c: Include <float.h>. (__asinhf): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-128/s_asinhl.c: Include <float.h>. (__asinhl): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-128ibm/s_asinhl.c: Include <float.h>. (__asinhl): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-96/s_asinhl.c: Include <float.h>. (__asinhl): Force underflow exception for arguments with small absolute value. * math/auto-libm-test-in: Do not mark underflow exceptions as possibly missing for bug 16350. * math/auto-libm-test-out: Regenerated.
68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* @(#)s_asinh.c 5.1 93/09/24 */
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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_asinh.c,v 1.9 1995/05/12 04:57:37 jtc Exp $";
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#endif
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/* asinh(x)
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* Method :
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* Based on
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* asinh(x) = sign(x) * log [ |x| + sqrt(x*x+1) ]
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* we have
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* asinh(x) := x if 1+x*x=1,
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* := sign(x)*(log(x)+ln2)) for large |x|, else
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* := sign(x)*log(2|x|+1/(|x|+sqrt(x*x+1))) if|x|>2, else
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* := sign(x)*log1p(|x| + x^2/(1 + sqrt(1+x^2)))
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*/
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#include <float.h>
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#include <math.h>
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#include <math_private.h>
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#include <math_ldbl_opt.h>
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static const long double
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one = 1.00000000000000000000e+00L, /* 0x3ff0000000000000, 0 */
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ln2 = 0.6931471805599453094172321214581766L, /* 0x3fe62e42fefa39ef, 0x3c7abc9e3b398040 */
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huge= 1.00000000000000000000e+300L;
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long double __asinhl(long double x)
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{
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long double t,w;
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int64_t hx,ix;
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double xhi;
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xhi = ldbl_high (x);
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EXTRACT_WORDS64 (hx, xhi);
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ix = hx&0x7fffffffffffffffLL;
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if(ix>=0x7ff0000000000000LL) return x+x; /* x is inf or NaN */
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if(ix< 0x3c70000000000000LL) { /* |x|<2**-56 */
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if (fabsl (x) < LDBL_MIN)
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{
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long double force_underflow = x * x;
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math_force_eval (force_underflow);
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}
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if(huge+x>one) return x; /* return x inexact except 0 */
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}
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if(ix>0x4370000000000000LL) { /* |x| > 2**56 */
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w = __ieee754_logl(fabsl(x))+ln2;
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} else if (ix>0x4000000000000000LL) { /* 2**56 >= |x| > 2.0 */
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t = fabs(x);
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w = __ieee754_logl(2.0*t+one/(__ieee754_sqrtl(x*x+one)+t));
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} else { /* 2.0 >= |x| >= 2**-56 */
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t = x*x;
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w =__log1pl(fabsl(x)+t/(one+__ieee754_sqrtl(one+t)));
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}
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if(hx>0) return w; else return -w;
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}
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long_double_symbol (libm, __asinhl, asinhl);
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