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annotate tomsfastmath/src/generators/comba_mont_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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include <stdio.h>
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2
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3 int main(void)
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4 {
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5 int x, y, z;
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6
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7 printf(
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8 #if 1
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9 "#ifdef TFM_SMALL_SET\n"
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10 "/* computes x/R == x (mod N) via Montgomery Reduction */\n"
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11 "void fp_montgomery_reduce_small(fp_int *a, fp_int *m, fp_digit mp)\n"
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12 "{\n"
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13 " fp_digit c[FP_SIZE], *_c, *tmpm, mu, cy;\n"
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14 " int oldused, x, y, pa;\n"
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15 "\n"
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16 "#if defined(USE_MEMSET)\n"
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17 " /* now zero the buff */\n"
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18 " memset(c, 0, sizeof c);\n"
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19 "#endif\n"
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20 " pa = m->used;\n"
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21 "\n"
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22 " /* copy the input */\n"
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23 " oldused = a->used;\n"
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24 " for (x = 0; x < oldused; x++) {\n"
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25 " c[x] = a->dp[x];\n"
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26 " }\n"
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27 "#if !defined(USE_MEMSET)\n"
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28 " for (; x < 2*pa+3; x++) {\n"
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29 " c[x] = 0;\n"
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30 " }\n"
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31 "#endif\n"
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32 " MONT_START;\n"
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33 #endif
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34 "\n"
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35 " switch (pa) {\n");
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36
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37 for (x = 1; x <= 16; x++) {
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38 if (x > 16 && (x != 32 && x != 48 && x != 64)) continue;
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39 if (x > 16) printf("#ifdef TFM_HUGE\n");
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43 printf(" case %d:\n", x);
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45 for (y = 0; y < x; y++) {
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46
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47 printf(" x = %d; cy = 0;\n"
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48 " LOOP_START;\n"
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49 " _c = c + %d;\n"
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50 " tmpm = m->dp;\n", y, y);
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51
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52 printf("#ifdef INNERMUL8\n");
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53 for (z = 0; z+8 <= x; z += 8) {
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54 printf(" INNERMUL8; _c += 8; tmpm += 8;\n");
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55 }
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56 for (; z < x; z++) {
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57 printf(" INNERMUL; ++_c;\n");
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58 }
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59 printf("#else\n");
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60 for (z = 0; z < x; z++) {
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61 printf(" INNERMUL; ++_c;\n");
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62 }
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63 printf("#endif\n");
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64 printf(" LOOP_END;\n"
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65 " while (cy) {\n"
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66 " PROPCARRY;\n"
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67 " ++_c;\n"
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68 " }\n");
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69 }
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70 //printf(" }\n");
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71 printf(" break;\n");
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72
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75 #define LOOP_MACRO(stride) \
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76 for (x = 0; x < stride; x++) { \
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77 fp_digit cy = 0; \
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78 /* get Mu for this round */ \
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79 LOOP_START; \
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80 _c = c + x; \
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81 tmpm = m->dp; \
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82 for (y = 0; y < stride; y++) { \
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83 INNERMUL; \
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84 ++_c; \
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85 } \
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86 LOOP_END; \
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87 while (cy) { \
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88 PROPCARRY; \
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89 ++_c; \
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90 } \
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91 }
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92
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93
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97 if (x > 16) printf("#endif /* TFM_HUGE */\n");
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99
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100 }
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101
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102 #if 1
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103
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104 printf(
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105 " }\n"
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106 " /* now copy out */\n"
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107 " _c = c + pa;\n"
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108 " tmpm = a->dp;\n"
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109 " for (x = 0; x < pa+1; x++) {\n"
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110 " *tmpm++ = *_c++;\n"
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111 " }\n"
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112 "\n"
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113 " for (; x < oldused; x++) {\n"
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114 " *tmpm++ = 0;\n"
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115 " }\n"
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116 "\n"
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117 " MONT_FINI;\n"
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118 "\n"
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119 " a->used = pa+1;\n"
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120 " fp_clamp(a);\n"
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121 "\n"
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122 " /* if A >= m then A = A - m */\n"
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123 " if (fp_cmp_mag (a, m) != FP_LT) {\n"
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124 " s_fp_sub (a, m, a);\n"
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125 " }\n"
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126 "}\n\n#endif\n");
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127
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128 #endif
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129
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130
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131 return 0;
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132 }