| 1 | /****************************************************************
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| 2 |
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| 3 | The author of this software is David M. Gay.
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| 4 |
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| 5 | Copyright (C) 1998 by Lucent Technologies
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| 6 | All Rights Reserved
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| 7 |
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| 8 | Permission to use, copy, modify, and distribute this software and
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| 9 | its documentation for any purpose and without fee is hereby
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| 10 | granted, provided that the above copyright notice appear in all
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| 11 | copies and that both that the copyright notice and this
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| 12 | permission notice and warranty disclaimer appear in supporting
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| 13 | documentation, and that the name of Lucent or any of its entities
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| 14 | not be used in advertising or publicity pertaining to
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| 15 | distribution of the software without specific, written prior
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| 16 | permission.
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| 17 |
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| 18 | LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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| 19 | INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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| 20 | IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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| 21 | SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 22 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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| 23 | IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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| 24 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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| 25 | THIS SOFTWARE.
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| 26 |
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| 27 | ****************************************************************/
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| 28 |
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| 29 | /* Please send bug reports to
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| 30 | David M. Gay
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| 31 | Bell Laboratories, Room 2C-463
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| 32 | 600 Mountain Avenue
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| 33 | Murray Hill, NJ 07974-0636
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| 34 | U.S.A.
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| 35 | dmg@bell-labs.com
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| 36 | */
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| 37 |
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| 38 | #include "gdtoaimp.h"
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| 39 |
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| 40 | void
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| 41 | #ifdef KR_headers
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| 42 | rshift(b, k) Bigint *b; int k;
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| 43 | #else
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| 44 | rshift(Bigint *b, int k)
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| 45 | #endif
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| 46 | {
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| 47 | ULong *x, *x1, *xe, y;
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| 48 | int n;
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| 49 |
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| 50 | x = x1 = b->x;
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| 51 | n = k >> kshift;
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| 52 | if (n < b->wds) {
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| 53 | xe = x + b->wds;
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| 54 | x += n;
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| 55 | if (k &= kmask) {
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| 56 | n = ULbits - k;
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| 57 | y = *x++ >> k;
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| 58 | while(x < xe) {
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| 59 | *x1++ = (y | (*x << n)) & ALL_ON;
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| 60 | y = *x++ >> k;
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| 61 | }
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| 62 | if ((*x1 = y) !=0)
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| 63 | x1++;
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| 64 | }
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| 65 | else
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| 66 | while(x < xe)
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| 67 | *x1++ = *x++;
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| 68 | }
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| 69 | if ((b->wds = x1 - b->x) == 0)
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| 70 | b->x[0] = 0;
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| 71 | }
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| 72 |
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| 73 | int
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| 74 | #ifdef KR_headers
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| 75 | trailz(b) Bigint *b;
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| 76 | #else
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| 77 | trailz(Bigint *b)
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| 78 | #endif
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| 79 | {
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| 80 | ULong L, *x, *xe;
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| 81 | int n = 0;
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| 82 |
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| 83 | x = b->x;
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| 84 | xe = x + b->wds;
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| 85 | for(n = 0; x < xe && !*x; x++)
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| 86 | n += ULbits;
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| 87 | if (x < xe) {
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| 88 | L = *x;
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| 89 | n += lo0bits(&L);
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| 90 | }
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| 91 | return n;
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| 92 | }
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