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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.
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/* s_asinhf.c -- float version of s_asinh.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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#include <float.h>
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#include <math.h>
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#include <math_private.h>
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static const float
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one = 1.0000000000e+00, /* 0x3F800000 */
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ln2 = 6.9314718246e-01, /* 0x3f317218 */
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huge= 1.0000000000e+30;
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float
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__asinhf(float x)
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{
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float w;
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int32_t hx,ix;
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GET_FLOAT_WORD(hx,x);
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ix = hx&0x7fffffff;
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if(__builtin_expect(ix< 0x38000000, 0)) { /* |x|<2**-14 */
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if (fabsf (x) < FLT_MIN)
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{
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float 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(__builtin_expect(ix>0x47000000, 0)) { /* |x| > 2**14 */
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if(ix>=0x7f800000) return x+x; /* x is inf or NaN */
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w = __ieee754_logf(fabsf(x))+ln2;
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} else {
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float xa = fabsf(x);
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if (ix>0x40000000) { /* 2**14 > |x| > 2.0 */
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w = __ieee754_logf(2.0f*xa+one/(__ieee754_sqrtf(xa*xa+one)+xa));
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} else { /* 2.0 > |x| > 2**-14 */
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float t = xa*xa;
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w =__log1pf(xa+t/(one+__ieee754_sqrtf(one+t)));
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}
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}
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return __copysignf(w, x);
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}
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weak_alias (__asinhf, asinhf)
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