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annotate tomsfastmath/src/bit/fp_rshd.c @ 643:a362b62d38b2 dropbear-tfm

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Add tomsfastmath from git rev bfa4582842bc3bab42e4be4aed5703437049502a with Makefile.in renamed
author Matt Johnston <matt@ucc.asn.au>
date Wed, 23 Nov 2011 18:10:20 +0700
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a362b62d38b2 Add tomsfastmath from git rev bfa4582842bc3bab42e4be4aed5703437049502a
Matt Johnston <matt@ucc.asn.au>
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1 /* TomsFastMath, a fast ISO C bignum library.
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2 *
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3 * This project is meant to fill in where LibTomMath
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4 * falls short. That is speed ;-)
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5 *
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6 * This project is public domain and free for all purposes.
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7 *
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8 * Tom St Denis, [email protected]
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9 */
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10 #include <tfm.h>
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12 void fp_rshd(fp_int *a, int x)
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13 {
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14 int y;
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16 /* too many digits just zero and return */
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17 if (x >= a->used) {
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18 fp_zero(a);
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19 return;
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20 }
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22 /* shift */
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23 for (y = 0; y < a->used - x; y++) {
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24 a->dp[y] = a->dp[y+x];
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25 }
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27 /* zero rest */
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28 for (; y < a->used; y++) {
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29 a->dp[y] = 0;
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30 }
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32 /* decrement count */
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33 a->used -= x;
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34 fp_clamp(a);
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35 }
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38 /* $Source$ */
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39 /* $Revision$ */
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40 /* $Date$ */