1996-03-05 21:41:30 +00:00
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/* s_frexpf.c -- float version of s_frexp.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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2013-06-05 20:44:03 +00:00
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* software is freely granted, provided that this notice
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1996-03-05 21:41:30 +00:00
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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_frexpf.c,v 1.5 1995/05/10 20:47:26 jtc Exp $";
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#endif
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2012-03-09 19:29:16 +00:00
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#include <math.h>
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#include <math_private.h>
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2017-09-22 20:24:12 +00:00
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#include <libm-alias-float.h>
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1996-03-05 21:41:30 +00:00
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static const float
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two25 = 3.3554432000e+07; /* 0x4c000000 */
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2012-01-27 17:27:55 +00:00
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float __frexpf(float x, int *eptr)
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1996-03-05 21:41:30 +00:00
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{
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int32_t hx,ix;
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GET_FLOAT_WORD(hx,x);
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ix = 0x7fffffff&hx;
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*eptr = 0;
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2016-06-13 17:27:19 +00:00
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if(ix>=0x7f800000||(ix==0)) return x + x; /* 0,inf,nan */
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1996-03-05 21:41:30 +00:00
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if (ix<0x00800000) { /* subnormal */
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x *= two25;
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GET_FLOAT_WORD(hx,x);
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ix = hx&0x7fffffff;
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*eptr = -25;
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}
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*eptr += (ix>>23)-126;
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hx = (hx&0x807fffff)|0x3f000000;
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2000-09-30 21:38:19 +00:00
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SET_FLOAT_WORD(x,hx);
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1996-03-05 21:41:30 +00:00
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return x;
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}
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2017-09-22 20:24:12 +00:00
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libm_alias_float (__frexp, frexp)
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