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annotate tomsfastmath/src/addsub/fp_cmp_d.c @ 647:939cd3e22c87 dropbear-tfm

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- Fix constraints so we don't get warned about uninitialised variable (it isn't used as input by the asm)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Nov 2011 23:15:21 +0800
parents a362b62d38b2
children
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a362b62d38b2 Add tomsfastmath from git rev bfa4582842bc3bab42e4be4aed5703437049502a
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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 /* compare against a single digit */
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13 int fp_cmp_d(fp_int *a, fp_digit b)
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14 {
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15 /* compare based on sign */
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16 if ((b && a->used == 0) || a->sign == FP_NEG) {
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17 return FP_LT;
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18 }
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20 /* compare based on magnitude */
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21 if (a->used > 1) {
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22 return FP_GT;
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23 }
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25 /* compare the only digit of a to b */
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26 if (a->dp[0] > b) {
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27 return FP_GT;
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28 } else if (a->dp[0] < b) {
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29 return FP_LT;
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30 } else {
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31 return FP_EQ;
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32 }
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34 }
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36 /* $Source$ */
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37 /* $Revision$ */
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38 /* $Date$ */