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annotate tomsfastmath/src/generators/comba_sqr_gen.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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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
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11 #include <stdio.h>
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12
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13 int main(int argc, char **argv)
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14 {
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15 int x, y, z, N, f;
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16 N = atoi(argv[1]);
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17
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18 printf(
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19 "#define TFM_DEFINES\n"
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20 "#include \"fp_sqr_comba.c\"\n"
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21 "\n"
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22 "#ifdef TFM_SQR%d\n"
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23 "void fp_sqr_comba%d(fp_int *A, fp_int *B)\n"
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24 "{\n"
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25 " fp_digit *a, b[%d], c0, c1, c2, sc0, sc1, sc2;\n"
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26 "#ifdef TFM_ISO\n"
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27 " fp_word tt;\n"
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28 "#endif\n"
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29 "\n"
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30 " a = A->dp;\n"
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31 " COMBA_START; \n"
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32 "\n"
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33 " /* clear carries */\n"
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34 " CLEAR_CARRY;\n"
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35 "\n"
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36 " /* output 0 */\n"
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37 " SQRADD(a[0],a[0]);\n"
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38 " COMBA_STORE(b[0]);\n", N, N, N+N);
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39
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40 for (x = 1; x < N+N-1; x++) {
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41 printf(
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42 "\n /* output %d */\n"
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43 " CARRY_FORWARD;\n ", x);
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44
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45 for (f = y = 0; y < N; y++) {
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46 for (z = 0; z < N; z++) {
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47 if (z != y && z + y == x && y <= z) {
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48 ++f;
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49 }
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50 }
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51 }
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52
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53 if (f <= 2) {
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54 for (y = 0; y < N; y++) {
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55 for (z = 0; z < N; z++) {
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56 if (y<=z && (y+z)==x) {
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57 if (y == z) {
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58 printf("SQRADD(a[%d], a[%d]); ", y, y);
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59 } else {
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60 printf("SQRADD2(a[%d], a[%d]); ", y, z);
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61 }
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62 }
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63 }
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64 }
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65 } else {
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66 // new method
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67 /* do evens first */
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68 f = 0;
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69 for (y = 0; y < N; y++) {
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70 for (z = 0; z < N; z++) {
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71 if (z != y && z + y == x && y <= z) {
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72 if (f == 0) {
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73 // first double
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74 printf("SQRADDSC(a[%d], a[%d]); ", y, z);
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75 f = 1;
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76 } else {
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77 printf("SQRADDAC(a[%d], a[%d]); ", y, z);
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78 }
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79 }
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80 }
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81 }
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82 // forward the carry
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83 printf("SQRADDDB; ");
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84 if ((x&1) == 0) {
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85 // add the square
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86 printf("SQRADD(a[%d], a[%d]); ", x/2, x/2);
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87 }
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88 }
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89 printf("\n COMBA_STORE(b[%d]);\n", x);
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90 }
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91 printf(" COMBA_STORE2(b[%d]);\n", N+N-1);
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92
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93 printf(
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94 " COMBA_FINI;\n"
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95 "\n"
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96 " B->used = %d;\n"
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97 " B->sign = FP_ZPOS;\n"
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98 " memcpy(B->dp, b, %d * sizeof(fp_digit));\n"
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99 " memset(B->dp + %d, 0, (FP_SIZE - %d) * sizeof(fp_digit));\n"
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100 " fp_clamp(B);\n"
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101 "}\n#endif\n\n\n", N+N, N+N, N+N, N+N);
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102
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103 return 0;
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104 }
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105
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106 /* $Source$ */
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107 /* $Revision$ */
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108 /* $Date$ */