192 lines
3.6 KiB
C
192 lines
3.6 KiB
C
/****************************************************************
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The author of this software is David M. Gay.
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Copyright (C) 1998, 1999 by Lucent Technologies
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All Rights Reserved
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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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/* 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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Bigint *
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s2b
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#ifdef KR_headers
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(s, nd0, nd, y9) CONST char *s; int nd0, nd; ULong y9;
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#else
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(CONST char *s, int nd0, int nd, ULong y9)
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#endif
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{
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Bigint *b;
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int i, k;
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Long x, y;
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x = (nd + 8) / 9;
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for(k = 0, y = 1; x > y; y <<= 1, k++) ;
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#ifdef Pack_32
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b = Balloc(k);
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b->x[0] = y9;
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b->wds = 1;
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#else
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b = Balloc(k+1);
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b->x[0] = y9 & 0xffff;
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b->wds = (b->x[1] = y9 >> 16) ? 2 : 1;
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#endif
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i = 9;
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if (9 < nd0) {
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s += 9;
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do b = multadd(b, 10, *s++ - '0');
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while(++i < nd0);
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s++;
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}
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else
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s += 10;
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for(; i < nd; i++)
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b = multadd(b, 10, *s++ - '0');
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return b;
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}
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double
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ratio
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#ifdef KR_headers
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(a, b) Bigint *a, *b;
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#else
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(Bigint *a, Bigint *b)
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#endif
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{
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double da, db;
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int k, ka, kb;
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dval(da) = b2d(a, &ka);
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dval(db) = b2d(b, &kb);
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k = ka - kb + ULbits*(a->wds - b->wds);
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#ifdef IBM
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if (k > 0) {
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word0(da) += (k >> 2)*Exp_msk1;
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if (k &= 3)
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dval(da) *= 1 << k;
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}
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else {
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k = -k;
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word0(db) += (k >> 2)*Exp_msk1;
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if (k &= 3)
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dval(db) *= 1 << k;
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}
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#else
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if (k > 0)
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word0(da) += k*Exp_msk1;
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else {
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k = -k;
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word0(db) += k*Exp_msk1;
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}
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#endif
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return dval(da) / dval(db);
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}
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#ifdef INFNAN_CHECK
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int
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match
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#ifdef KR_headers
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(sp, t) char **sp, *t;
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#else
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(CONST char **sp, char *t)
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#endif
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{
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int c, d;
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CONST char *s = *sp;
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while( (d = *t++) !=0) {
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if ((c = *++s) >= 'A' && c <= 'Z')
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c += 'a' - 'A';
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if (c != d)
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return 0;
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}
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*sp = s + 1;
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return 1;
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}
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#endif /* INFNAN_CHECK */
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void
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#ifdef KR_headers
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copybits(c, n, b) ULong *c; int n; Bigint *b;
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#else
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copybits(ULong *c, int n, Bigint *b)
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#endif
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{
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ULong *ce, *x, *xe;
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#ifdef Pack_16
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int nw, nw1;
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#endif
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ce = c + ((n-1) >> kshift) + 1;
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x = b->x;
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#ifdef Pack_32
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xe = x + b->wds;
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while(x < xe)
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*c++ = *x++;
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#else
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nw = b->wds;
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nw1 = nw & 1;
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for(xe = x + (nw - nw1); x < xe; x += 2)
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Storeinc(c, x[1], x[0]);
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if (nw1)
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*c++ = *x;
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#endif
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while(c < ce)
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*c++ = 0;
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}
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ULong
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#ifdef KR_headers
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any_on(b, k) Bigint *b; int k;
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#else
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any_on(Bigint *b, int k)
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#endif
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{
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int n, nwds;
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ULong *x, *x0, x1, x2;
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x = b->x;
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nwds = b->wds;
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n = k >> kshift;
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if (n > nwds)
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n = nwds;
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else if (n < nwds && (k &= kmask)) {
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x1 = x2 = x[n];
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x1 >>= k;
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x1 <<= k;
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if (x1 != x2)
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return 1;
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}
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x0 = x;
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x += n;
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while(x > x0)
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if (*--x)
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return 1;
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return 0;
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}
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