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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/****************************************************************
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The author of this software is David M. Gay.
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Copyright (C) 2004 by David M. Gay.
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All Rights Reserved
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Based on material in the rest of /netlib/fp/gdota.tar.gz,
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which is copyright (C) 1998, 2000 by Lucent Technologies.
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of Lucent or any of its entities
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not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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/* This is a variant of strtod that works on Intel ia32 systems */
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/* with the default extended-precision arithmetic -- it does not */
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/* require setting the precision control to 53 bits. */
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/* Please send bug reports to David M. Gay (dmg at acm dot org,
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* with " at " changed at "@" and " dot " changed to "."). */
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#include "gdtoaimp.h"
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double
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#ifdef KR_headers
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strtod(s, sp) CONST char *s; char **sp;
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#else
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strtod(CONST char *s, char **sp)
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#endif
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{
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static FPI fpi = { 53, 1-1023-53+1, 2046-1023-53+1, 1, SI };
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ULong bits[2];
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Long exp;
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int k;
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union { ULong L[2]; double d; } u;
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k = strtodg(s, sp, &fpi, &exp, bits);
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switch(k & STRTOG_Retmask) {
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case STRTOG_NoNumber:
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case STRTOG_Zero:
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u.L[0] = u.L[1] = 0;
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break;
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case STRTOG_Normal:
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u.L[_1] = bits[0];
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u.L[_0] = (bits[1] & ~0x100000) | ((exp + 0x3ff + 52) << 20);
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break;
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case STRTOG_Denormal:
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u.L[_1] = bits[0];
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u.L[_0] = bits[1];
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break;
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case STRTOG_Infinite:
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u.L[_0] = 0x7ff00000;
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u.L[_1] = 0;
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break;
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case STRTOG_NaN:
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u.L[0] = d_QNAN0;
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u.L[1] = d_QNAN1;
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break;
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case STRTOG_NaNbits:
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u.L[_0] = 0x7ff00000 | bits[1];
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u.L[_1] = bits[0];
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}
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if (k & STRTOG_Neg)
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u.L[_0] |= 0x80000000L;
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return u.d;
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}
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