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annotate tomsfastmath/src/generators/comba_mult_smallgen.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 /* program emits a NxN comba multiplier for 1x1 to 16x16 */
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2 #include <stdio.h>
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3
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4 int main(int argc, char **argv)
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5 {
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6 int N, x, y, z;
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7
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8 /* print out preamble */
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9 printf(
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10 "void fp_mul_comba_small(fp_int *A, fp_int *B, fp_int *C)\n"
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11 "{\n"
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12 " fp_digit c0, c1, c2, at[32];\n"
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13 " switch (MAX(A->used, B->used)) { \n"
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14 );
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15
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16 for (N = 1; N <= 16; N++) {
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17
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18 printf(
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19 "\n"
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20 " case %d:\n"
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21 " memcpy(at, A->dp, %d * sizeof(fp_digit));\n"
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22 " memcpy(at+%d, B->dp, %d * sizeof(fp_digit));\n"
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23 " COMBA_START;\n"
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24 "\n"
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25 " COMBA_CLEAR;\n", N, N, N, N);
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27 /* now do the rows */
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28 for (x = 0; x < (N+N-1); x++) {
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29 printf(
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30 " /* %d */\n", x);
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31 if (x > 0) {
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32 printf(
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33 " COMBA_FORWARD;\n");
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34 }
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35 for (y = 0; y < N; y++) {
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36 for (z = 0; z < N; z++) {
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37 if ((y+z)==x) {
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38 printf(" MULADD(at[%d], at[%d]); ", y, z+N);
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39 }
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40 }
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41 }
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42 printf(
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43 "\n"
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44 " COMBA_STORE(C->dp[%d]);\n", x);
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45 }
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46 printf(
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47 " COMBA_STORE2(C->dp[%d]);\n"
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48 " C->used = %d;\n"
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49 " C->sign = A->sign ^ B->sign;\n"
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50 " fp_clamp(C);\n"
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51 " COMBA_FINI;\n"
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52 " break;\n", N+N-1, N+N);
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53 }
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54 printf(" }\n}\n\n");
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55
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56 return 0;
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57 }
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58
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59 /* $Source$ */
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60 /* $Revision$ */
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61 /* $Date$ */