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annotate tomsfastmath/src/sqr/fp_sqr_comba_4.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 #define TFM_DEFINES
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2 #include "fp_sqr_comba.c"
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4 #ifdef TFM_SQR4
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5 void fp_sqr_comba4(fp_int *A, fp_int *B)
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6 {
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7 fp_digit *a, b[8], c0, c1, c2, sc0, sc1, sc2;
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8 #ifdef TFM_ISO
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9 fp_word tt;
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10 #endif
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12 a = A->dp;
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13 COMBA_START;
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15 /* clear carries */
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16 CLEAR_CARRY;
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18 /* output 0 */
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19 SQRADD(a[0],a[0]);
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20 COMBA_STORE(b[0]);
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22 /* output 1 */
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23 CARRY_FORWARD;
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24 SQRADD2(a[0], a[1]);
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25 COMBA_STORE(b[1]);
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27 /* output 2 */
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28 CARRY_FORWARD;
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29 SQRADD2(a[0], a[2]); SQRADD(a[1], a[1]);
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30 COMBA_STORE(b[2]);
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32 /* output 3 */
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33 CARRY_FORWARD;
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34 SQRADD2(a[0], a[3]); SQRADD2(a[1], a[2]);
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35 COMBA_STORE(b[3]);
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37 /* output 4 */
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38 CARRY_FORWARD;
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39 SQRADD2(a[1], a[3]); SQRADD(a[2], a[2]);
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40 COMBA_STORE(b[4]);
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42 /* output 5 */
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43 CARRY_FORWARD;
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44 SQRADD2(a[2], a[3]);
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45 COMBA_STORE(b[5]);
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47 /* output 6 */
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48 CARRY_FORWARD;
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49 SQRADD(a[3], a[3]);
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50 COMBA_STORE(b[6]);
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51 COMBA_STORE2(b[7]);
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52 COMBA_FINI;
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54 B->used = 8;
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55 B->sign = FP_ZPOS;
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56 memcpy(B->dp, b, 8 * sizeof(fp_digit));
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57 memset(B->dp + 8, 0, (FP_SIZE - 8) * sizeof(fp_digit));
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58 fp_clamp(B);
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59 }
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60 #endif
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