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39793865ec
This patch makes dbl-64 frexp use libm_alias_double. Both the dbl-64 and dbl-64/wordsize-64 versions are changed; the ldbl-opt version is made to define only the libc frexpl compat symbol, now the generic code handles the libm compat symbol automatically. Tested for x86_64, and verified with build-many-glibcs.py that installed stripped shared libraries are unchanged by this patch. * sysdeps/ieee754/dbl-64/s_frexp.c: Include <libm-alias-double.h>. (frexp): Define using libm_alias_double. * sysdeps/ieee754/dbl-64/wordsize-64/s_frexp.c: Include <libm-alias-double.h>. (frexp): Define using libm_alias_double. * sysdeps/ieee754/ldbl-opt/s_frexp.c (frexpl): Only define libc compat symbol here.
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/* @(#)s_frexp.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_frexp.c,v 1.9 1995/05/10 20:47:24 jtc Exp $";
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#endif
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/*
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* for non-zero x
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* x = frexp(arg,&exp);
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* return a double fp quantity x such that 0.5 <= |x| <1.0
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* and the corresponding binary exponent "exp". That is
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* arg = x*2^exp.
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* If arg is inf, 0.0, or NaN, then frexp(arg,&exp) returns arg
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* with *exp=0.
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*/
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#include <math.h>
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#include <math_private.h>
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#include <libm-alias-double.h>
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static const double
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two54 = 1.80143985094819840000e+16; /* 0x43500000, 0x00000000 */
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double
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__frexp (double x, int *eptr)
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{
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int32_t hx, ix, lx;
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EXTRACT_WORDS (hx, lx, x);
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ix = 0x7fffffff & hx;
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*eptr = 0;
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if (ix >= 0x7ff00000 || ((ix | lx) == 0))
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return x + x; /* 0,inf,nan */
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if (ix < 0x00100000) /* subnormal */
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{
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x *= two54;
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GET_HIGH_WORD (hx, x);
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ix = hx & 0x7fffffff;
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*eptr = -54;
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}
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*eptr += (ix >> 20) - 1022;
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hx = (hx & 0x800fffff) | 0x3fe00000;
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SET_HIGH_WORD (x, hx);
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return x;
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}
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libm_alias_double (__frexp, frexp)
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