1 | |
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2 | #include <NTL/LLL.h> |
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3 | #include <NTL/vec_quad_float.h> |
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4 | #include <NTL/fileio.h> |
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5 | |
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6 | |
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7 | #include <NTL/new.h> |
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8 | |
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9 | NTL_START_IMPL |
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10 | |
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11 | |
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12 | static inline |
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13 | void CheckFinite(double *p) |
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14 | { |
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15 | if (!IsFinite(p)) Error("G_LLL_QP: numbers too big...use G_LLL_XD"); |
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16 | } |
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17 | |
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18 | |
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19 | static inline |
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20 | void CheckFinite(quad_float *p) |
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21 | { |
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22 | if (!IsFinite(p)) Error("G_LLL_QP: numbers too big...use G_LLL_XD"); |
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23 | } |
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24 | |
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25 | |
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26 | |
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27 | static void RowTransform(vec_ZZ& A, vec_ZZ& B, const ZZ& MU1) |
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28 | // x = x - y*MU |
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29 | { |
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30 | static ZZ T, MU; |
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31 | long k; |
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32 | |
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33 | long n = A.length(); |
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34 | long i; |
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35 | |
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36 | MU = MU1; |
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37 | |
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38 | if (MU == 1) { |
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39 | for (i = 1; i <= n; i++) |
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40 | sub(A(i), A(i), B(i)); |
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41 | |
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42 | return; |
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43 | } |
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44 | |
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45 | if (MU == -1) { |
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46 | for (i = 1; i <= n; i++) |
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47 | add(A(i), A(i), B(i)); |
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48 | |
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49 | return; |
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50 | } |
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51 | |
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52 | if (MU == 0) return; |
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53 | |
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54 | if (NumTwos(MU) >= NTL_ZZ_NBITS) |
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55 | k = MakeOdd(MU); |
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56 | else |
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57 | k = 0; |
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58 | |
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59 | |
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60 | if (MU.WideSinglePrecision()) { |
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61 | long mu1; |
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62 | conv(mu1, MU); |
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63 | |
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64 | for (i = 1; i <= n; i++) { |
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65 | mul(T, B(i), mu1); |
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66 | if (k > 0) LeftShift(T, T, k); |
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67 | sub(A(i), A(i), T); |
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68 | } |
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69 | } |
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70 | else { |
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71 | for (i = 1; i <= n; i++) { |
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72 | mul(T, B(i), MU); |
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73 | if (k > 0) LeftShift(T, T, k); |
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74 | sub(A(i), A(i), T); |
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75 | } |
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76 | } |
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77 | } |
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78 | |
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79 | #define TR_BND (NTL_FDOUBLE_PRECISION/2.0) |
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80 | // Just to be safe!! |
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81 | |
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82 | static double max_abs(quad_float *v, long n) |
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83 | { |
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84 | long i; |
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85 | double res, t; |
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86 | |
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87 | res = 0; |
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88 | |
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89 | for (i = 1; i <= n; i++) { |
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90 | t = fabs(v[i].hi); |
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91 | if (t > res) res = t; |
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92 | } |
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93 | |
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94 | return res; |
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95 | } |
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96 | |
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97 | |
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98 | static void RowTransformStart(quad_float *a, long *in_a, long& in_float, long n) |
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99 | { |
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100 | long i; |
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101 | long inf = 1; |
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102 | |
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103 | for (i = 1; i <= n; i++) { |
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104 | in_a[i] = (a[i].hi < TR_BND && a[i].hi > -TR_BND); |
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105 | inf = inf & in_a[i]; |
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106 | } |
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107 | |
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108 | in_float = inf; |
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109 | } |
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110 | |
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111 | |
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112 | static void RowTransformFinish(vec_ZZ& A, quad_float *a, long *in_a) |
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113 | { |
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114 | long n = A.length(); |
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115 | long i; |
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116 | |
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117 | for (i = 1; i <= n; i++) { |
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118 | if (in_a[i]) { |
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119 | conv(A(i), a[i].hi); |
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120 | } |
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121 | else { |
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122 | conv(a[i], A(i)); |
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123 | CheckFinite(&a[i]); |
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124 | } |
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125 | } |
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126 | } |
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127 | |
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128 | |
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129 | |
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130 | |
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131 | |
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132 | |
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133 | |
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134 | static void RowTransform(vec_ZZ& A, vec_ZZ& B, const ZZ& MU1, |
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135 | quad_float *a, quad_float *b, long *in_a, |
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136 | double& max_a, double max_b, long& in_float) |
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137 | // x = x - y*MU |
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138 | { |
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139 | static ZZ T, MU; |
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140 | long k; |
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141 | double mu; |
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142 | |
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143 | |
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144 | long n = A.length(); |
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145 | long i; |
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146 | |
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147 | conv(mu, MU1); |
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148 | CheckFinite(&mu); |
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149 | |
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150 | if (in_float) { |
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151 | double mu_abs = fabs(mu); |
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152 | if (mu_abs > 0 && max_b > 0 && (mu_abs >= TR_BND || max_b >= TR_BND)) { |
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153 | in_float = 0; |
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154 | } |
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155 | else { |
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156 | max_a += mu_abs*max_b; |
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157 | if (max_a >= TR_BND) |
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158 | in_float = 0; |
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159 | } |
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160 | } |
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161 | |
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162 | if (in_float) { |
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163 | if (mu == 1) { |
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164 | for (i = 1; i <= n; i++) |
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165 | a[i].hi -= b[i].hi; |
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166 | |
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167 | return; |
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168 | } |
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169 | |
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170 | if (mu == -1) { |
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171 | for (i = 1; i <= n; i++) |
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172 | a[i].hi += b[i].hi; |
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173 | |
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174 | return; |
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175 | } |
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176 | |
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177 | if (mu == 0) return; |
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178 | |
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179 | for (i = 1; i <= n; i++) |
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180 | a[i].hi -= mu*b[i].hi; |
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181 | |
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182 | |
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183 | return; |
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184 | } |
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185 | |
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186 | MU = MU1; |
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187 | |
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188 | if (MU == 1) { |
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189 | for (i = 1; i <= n; i++) { |
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190 | if (in_a[i] && a[i].hi < TR_BND && a[i].hi > -TR_BND && |
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191 | b[i].hi < TR_BND && b[i].hi > -TR_BND) { |
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192 | |
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193 | a[i].hi -= b[i].hi; |
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194 | } |
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195 | else { |
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196 | if (in_a[i]) { |
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197 | conv(A(i), a[i].hi); |
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198 | in_a[i] = 0; |
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199 | } |
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200 | |
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201 | sub(A(i), A(i), B(i)); |
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202 | } |
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203 | } |
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204 | |
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205 | return; |
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206 | } |
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207 | |
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208 | if (MU == -1) { |
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209 | for (i = 1; i <= n; i++) { |
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210 | if (in_a[i] && a[i].hi < TR_BND && a[i].hi > -TR_BND && |
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211 | b[i].hi < TR_BND && b[i].hi > -TR_BND) { |
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212 | |
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213 | a[i].hi += b[i].hi; |
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214 | } |
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215 | else { |
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216 | if (in_a[i]) { |
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217 | conv(A(i), a[i].hi); |
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218 | in_a[i] = 0; |
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219 | } |
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220 | |
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221 | add(A(i), A(i), B(i)); |
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222 | } |
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223 | } |
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224 | |
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225 | return; |
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226 | } |
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227 | |
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228 | if (MU == 0) return; |
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229 | |
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230 | double b_bnd = fabs(TR_BND/mu) - 1; |
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231 | if (b_bnd < 0) b_bnd = 0; |
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232 | |
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233 | |
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234 | if (NumTwos(MU) >= NTL_ZZ_NBITS) |
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235 | k = MakeOdd(MU); |
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236 | else |
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237 | k = 0; |
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238 | |
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239 | |
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240 | if (MU.WideSinglePrecision()) { |
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241 | long mu1; |
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242 | conv(mu1, MU); |
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243 | |
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244 | if (k > 0) { |
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245 | for (i = 1; i <= n; i++) { |
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246 | if (in_a[i]) { |
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247 | conv(A(i), a[i].hi); |
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248 | in_a[i] = 0; |
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249 | } |
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250 | |
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251 | mul(T, B(i), mu1); |
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252 | LeftShift(T, T, k); |
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253 | sub(A(i), A(i), T); |
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254 | } |
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255 | } |
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256 | else { |
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257 | for (i = 1; i <= n; i++) { |
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258 | if (in_a[i] && a[i].hi < TR_BND && a[i].hi > -TR_BND && |
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259 | b[i].hi < b_bnd && b[i].hi > -b_bnd) { |
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260 | |
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261 | a[i].hi -= b[i].hi*mu; |
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262 | } |
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263 | else { |
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264 | if (in_a[i]) { |
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265 | conv(A(i), a[i].hi); |
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266 | in_a[i] = 0; |
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267 | } |
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268 | mul(T, B(i), mu1); |
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269 | sub(A(i), A(i), T); |
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270 | } |
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271 | } |
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272 | } |
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273 | } |
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274 | else { |
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275 | for (i = 1; i <= n; i++) { |
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276 | if (in_a[i]) { |
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277 | conv(A(i), a[i].hi); |
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278 | in_a[i] = 0; |
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279 | } |
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280 | mul(T, B(i), MU); |
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281 | if (k > 0) LeftShift(T, T, k); |
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282 | sub(A(i), A(i), T); |
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283 | } |
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284 | } |
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285 | } |
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286 | |
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287 | static void RowTransform2(vec_ZZ& A, vec_ZZ& B, const ZZ& MU1) |
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288 | // x = x + y*MU |
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289 | { |
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290 | static ZZ T, MU; |
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291 | long k; |
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292 | |
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293 | long n = A.length(); |
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294 | long i; |
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295 | |
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296 | MU = MU1; |
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297 | |
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298 | if (MU == 1) { |
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299 | for (i = 1; i <= n; i++) |
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300 | add(A(i), A(i), B(i)); |
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301 | |
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302 | return; |
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303 | } |
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304 | |
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305 | if (MU == -1) { |
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306 | for (i = 1; i <= n; i++) |
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307 | sub(A(i), A(i), B(i)); |
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308 | |
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309 | return; |
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310 | } |
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311 | |
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312 | if (MU == 0) return; |
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313 | |
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314 | if (NumTwos(MU) >= NTL_ZZ_NBITS) |
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315 | k = MakeOdd(MU); |
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316 | else |
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317 | k = 0; |
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318 | |
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319 | if (MU.WideSinglePrecision()) { |
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320 | long mu1; |
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321 | conv(mu1, MU); |
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322 | |
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323 | for (i = 1; i <= n; i++) { |
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324 | mul(T, B(i), mu1); |
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325 | if (k > 0) LeftShift(T, T, k); |
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326 | add(A(i), A(i), T); |
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327 | } |
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328 | } |
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329 | else { |
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330 | for (i = 1; i <= n; i++) { |
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331 | mul(T, B(i), MU); |
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332 | if (k > 0) LeftShift(T, T, k); |
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333 | add(A(i), A(i), T); |
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334 | } |
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335 | } |
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336 | } |
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337 | class GivensCache_QP { |
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338 | public: |
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339 | GivensCache_QP(long m, long n); |
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340 | ~GivensCache_QP(); |
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341 | |
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342 | void flush(); |
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343 | void selective_flush(long l); |
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344 | void swap(long l); |
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345 | void swap(); |
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346 | void touch(); |
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347 | void incr(); |
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348 | |
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349 | long sz; |
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350 | |
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351 | quad_float **buf; |
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352 | long *bl; |
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353 | long *bv; |
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354 | long bp; |
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355 | }; |
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356 | |
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357 | |
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358 | GivensCache_QP::GivensCache_QP(long m, long n) |
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359 | { |
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360 | sz = min(m, n)/10; |
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361 | if (sz < 2) |
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362 | sz = 2; |
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363 | else if (sz > 20) |
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364 | sz = 20; |
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365 | |
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366 | typedef quad_float *quad_floatptr; |
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367 | |
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368 | long i; |
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369 | buf = NTL_NEW_OP quad_floatptr[sz]; |
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370 | if (!buf) Error("out of memory"); |
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371 | for (i = 0; i < sz; i++) |
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372 | if (!(buf[i] = NTL_NEW_OP quad_float[n+1])) Error("out of memory"); |
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373 | |
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374 | bl = NTL_NEW_OP long[sz]; |
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375 | if (!bl) Error("out of memory"); |
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376 | for (i = 0; i < sz; i++) bl[0] = 0; |
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377 | |
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378 | bv = NTL_NEW_OP long[sz]; |
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379 | if (!bv) Error("out of memory"); |
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380 | for (i = 0; i < sz; i++) bv[0] = 0; |
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381 | |
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382 | bp = 0; |
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383 | } |
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384 | |
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385 | GivensCache_QP::~GivensCache_QP() |
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386 | { |
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387 | long i; |
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388 | |
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389 | for (i = 0; i < sz; i++) delete [] buf[i]; |
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390 | delete [] buf; |
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391 | delete [] bl; |
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392 | delete [] bv; |
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393 | } |
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394 | |
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395 | void GivensCache_QP::flush() |
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396 | { |
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397 | long i; |
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398 | for (i = 0; i < sz; i++) bl[i] = 0; |
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399 | } |
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400 | |
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401 | void GivensCache_QP::selective_flush(long l) |
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402 | { |
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403 | long i; |
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404 | |
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405 | for (i = 0; i < sz; i++) |
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406 | if (bl[i] && bv[i] >= l) |
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407 | bl[i] = 0; |
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408 | } |
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409 | |
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410 | void GivensCache_QP::swap(long l) |
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411 | { |
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412 | long k = bl[bp]; |
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413 | long i; |
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414 | |
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415 | i = 0; |
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416 | while (i < sz && bl[i] != l) |
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417 | i++; |
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418 | |
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419 | if (i < sz) { |
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420 | bl[bp] = l; |
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421 | bl[i] = k; |
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422 | } |
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423 | else |
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424 | bl[bp] = l; |
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425 | |
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426 | selective_flush(l); |
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427 | } |
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428 | |
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429 | void GivensCache_QP::swap() |
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430 | { |
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431 | swap(bl[bp] - 1); |
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432 | } |
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433 | |
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434 | void GivensCache_QP::touch() |
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435 | { |
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436 | long k = bl[bp]; |
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437 | bl[bp] = 0; |
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438 | selective_flush(k); |
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439 | } |
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440 | |
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441 | void GivensCache_QP::incr() |
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442 | { |
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443 | long k = bl[bp]; |
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444 | long k1 = k+1; |
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445 | long i; |
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446 | |
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447 | i = 0; |
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448 | while (i < sz && bl[i] != k1) |
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449 | i++; |
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450 | |
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451 | if (i < sz) { |
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452 | bp = i; |
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453 | return; |
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454 | } |
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455 | |
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456 | i = 0; |
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457 | while (i < sz && bl[i] != 0) |
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458 | i++; |
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459 | |
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460 | if (i < sz) { |
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461 | bp = i; |
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462 | return; |
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463 | } |
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464 | |
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465 | long max_val = 0; |
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466 | long max_index = 0; |
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467 | for (i = 0; i < sz; i++) { |
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468 | long t = labs(bl[i]-k1); |
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469 | if (t > max_val) { |
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470 | max_val = t; |
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471 | max_index = i; |
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472 | } |
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473 | } |
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474 | |
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475 | bp = max_index; |
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476 | bl[max_index] = 0; |
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477 | } |
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478 | |
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479 | |
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480 | static |
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481 | void GivensComputeGS(quad_float **B1, quad_float **mu, quad_float **aux, long k, long n, |
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482 | GivensCache_QP& cache) |
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483 | { |
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484 | long i, j; |
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485 | |
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486 | quad_float c, s, a, b, t; |
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487 | |
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488 | quad_float *p = mu[k]; |
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489 | |
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490 | quad_float *pp = cache.buf[cache.bp]; |
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491 | |
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492 | if (!cache.bl[cache.bp]) { |
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493 | for (j = 1; j <= n; j++) |
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494 | pp[j] = B1[k][j]; |
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495 | |
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496 | long backoff; |
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497 | backoff = k/4; |
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498 | if (backoff < 2) |
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499 | backoff = 2; |
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500 | else if (backoff > cache.sz + 2) |
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501 | backoff = cache.sz + 2; |
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502 | |
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503 | long ub = k-(backoff-1); |
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504 | |
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505 | for (i = 1; i < ub; i++) { |
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506 | quad_float *cptr = mu[i]; |
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507 | quad_float *sptr = aux[i]; |
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508 | |
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509 | for (j = n; j > i; j--) { |
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510 | c = cptr[j]; |
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511 | s = sptr[j]; |
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512 | |
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513 | a = c*pp[j-1] - s*pp[j]; |
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514 | b = s*pp[j-1] + c*pp[j]; |
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515 | |
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516 | pp[j-1] = a; |
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517 | pp[j] = b; |
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518 | } |
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519 | |
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520 | pp[i] = pp[i]/mu[i][i]; |
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521 | } |
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522 | |
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523 | cache.bl[cache.bp] = k; |
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524 | cache.bv[cache.bp] = k-backoff; |
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525 | } |
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526 | |
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527 | for (j = 1; j <= n; j++) |
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528 | p[j] = pp[j]; |
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529 | |
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530 | for (i = max(cache.bv[cache.bp]+1, 1); i < k; i++) { |
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531 | quad_float *cptr = mu[i]; |
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532 | quad_float *sptr = aux[i]; |
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533 | |
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534 | for (j = n; j > i; j--) { |
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535 | c = cptr[j]; |
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536 | s = sptr[j]; |
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537 | |
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538 | a = c*p[j-1] - s*p[j]; |
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539 | b = s*p[j-1] + c*p[j]; |
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540 | |
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541 | p[j-1] = a; |
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542 | p[j] = b; |
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543 | } |
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544 | |
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545 | p[i] = p[i]/mu[i][i]; |
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546 | } |
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547 | |
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548 | for (j = n; j > k; j--) { |
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549 | a = p[j-1]; |
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550 | b = p[j]; |
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551 | |
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552 | if (b == 0) { |
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553 | c = 1; |
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554 | s = 0; |
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555 | } |
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556 | else if (fabs(b) > fabs(a)) { |
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557 | t = -a/b; |
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558 | s = 1/sqrt(1 + t*t); |
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559 | c = s*t; |
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560 | } |
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561 | else { |
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562 | t = -b/a; |
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563 | c = 1/sqrt(1 + t*t); |
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564 | s = c*t; |
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565 | } |
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566 | |
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567 | p[j-1] = c*a - s*b; |
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568 | p[j] = c; |
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569 | aux[k][j] = s; |
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570 | } |
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571 | |
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572 | if (k > n+1) Error("G_LLL_QP: internal error"); |
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573 | if (k > n) p[k] = 0; |
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574 | |
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575 | for (i = 1; i <= k; i++) |
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576 | CheckFinite(&p[i]); |
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577 | } |
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578 | |
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579 | static quad_float red_fudge = to_quad_float(0); |
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580 | static long log_red = 0; |
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581 | |
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582 | static long verbose = 0; |
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583 | |
---|
584 | static unsigned long NumSwaps = 0; |
---|
585 | static double StartTime = 0; |
---|
586 | static double LastTime = 0; |
---|
587 | |
---|
588 | |
---|
589 | |
---|
590 | static void G_LLLStatus(long max_k, double t, long m, const mat_ZZ& B) |
---|
591 | { |
---|
592 | |
---|
593 | ZZ t1; |
---|
594 | long i; |
---|
595 | double prodlen = 0; |
---|
596 | |
---|
597 | for (i = 1; i <= m; i++) { |
---|
598 | InnerProduct(t1, B(i), B(i)); |
---|
599 | if (!IsZero(t1)) |
---|
600 | prodlen += log(t1); |
---|
601 | } |
---|
602 | |
---|
603 | LastTime = t; |
---|
604 | |
---|
605 | } |
---|
606 | |
---|
607 | |
---|
608 | static void init_red_fudge() |
---|
609 | { |
---|
610 | long i; |
---|
611 | |
---|
612 | // initial log_red should be <= NTL_DOUBLE_PRECISION-2, |
---|
613 | // to help ensure stability in G_BKZ_QP1 |
---|
614 | |
---|
615 | log_red = NTL_DOUBLE_PRECISION-2; |
---|
616 | |
---|
617 | red_fudge = 1; |
---|
618 | |
---|
619 | for (i = log_red; i > 0; i--) |
---|
620 | red_fudge = red_fudge*0.5; |
---|
621 | } |
---|
622 | |
---|
623 | static void inc_red_fudge() |
---|
624 | { |
---|
625 | |
---|
626 | red_fudge = red_fudge * 2; |
---|
627 | log_red--; |
---|
628 | |
---|
629 | if (log_red < 4) |
---|
630 | Error("G_LLL_QP: too much loss of precision...stop!"); |
---|
631 | } |
---|
632 | |
---|
633 | |
---|
634 | static |
---|
635 | long ll_G_LLL_QP(mat_ZZ& B, mat_ZZ* U, quad_float delta, long deep, |
---|
636 | LLLCheckFct check, quad_float **B1, quad_float **mu, |
---|
637 | quad_float **aux, |
---|
638 | long m, long init_k, long &quit, GivensCache_QP& cache) |
---|
639 | { |
---|
640 | long n = B.NumCols(); |
---|
641 | |
---|
642 | long i, j, k, Fc1; |
---|
643 | ZZ MU; |
---|
644 | quad_float mu1; |
---|
645 | |
---|
646 | quad_float t1; |
---|
647 | double dt1; |
---|
648 | ZZ T1; |
---|
649 | quad_float *tp; |
---|
650 | |
---|
651 | quad_float half = to_quad_float(0.5); |
---|
652 | quad_float half_plus_fudge = 0.5 + red_fudge; |
---|
653 | |
---|
654 | quit = 0; |
---|
655 | k = init_k; |
---|
656 | |
---|
657 | vec_long in_vec_mem; |
---|
658 | in_vec_mem.SetLength(n+1); |
---|
659 | long *in_vec = in_vec_mem.elts(); |
---|
660 | |
---|
661 | double *max_b; |
---|
662 | max_b = NTL_NEW_OP double [m+1]; |
---|
663 | if (!max_b) Error("out of memory in lll_G_LLL_QP"); |
---|
664 | |
---|
665 | for (i = 1; i <= m; i++) |
---|
666 | max_b[i] = max_abs(B1[i], n); |
---|
667 | |
---|
668 | long in_float; |
---|
669 | |
---|
670 | |
---|
671 | long counter; |
---|
672 | |
---|
673 | long trigger_index; |
---|
674 | long small_trigger; |
---|
675 | long cnt; |
---|
676 | |
---|
677 | long max_k = 0; |
---|
678 | |
---|
679 | double tt; |
---|
680 | |
---|
681 | cache.flush(); |
---|
682 | |
---|
683 | while (k <= m) { |
---|
684 | |
---|
685 | if (k > max_k) { |
---|
686 | max_k = k; |
---|
687 | } |
---|
688 | |
---|
689 | if (verbose) { |
---|
690 | tt = GetTime(); |
---|
691 | |
---|
692 | if (tt > LastTime + LLLStatusInterval) |
---|
693 | G_LLLStatus(max_k, tt, m, B); |
---|
694 | } |
---|
695 | |
---|
696 | |
---|
697 | GivensComputeGS(B1, mu, aux, k, n, cache); |
---|
698 | |
---|
699 | counter = 0; |
---|
700 | trigger_index = k; |
---|
701 | small_trigger = 0; |
---|
702 | cnt = 0; |
---|
703 | |
---|
704 | do { |
---|
705 | // size reduction |
---|
706 | |
---|
707 | counter++; |
---|
708 | if (counter > 10000) { |
---|
709 | //cerr << "G_LLL_QP: warning--possible infinite loop\n"; |
---|
710 | counter = 0; |
---|
711 | } |
---|
712 | |
---|
713 | |
---|
714 | Fc1 = 0; |
---|
715 | |
---|
716 | for (j = k-1; j >= 1; j--) { |
---|
717 | t1 = fabs(mu[k][j]); |
---|
718 | if (t1 > half_plus_fudge) { |
---|
719 | |
---|
720 | if (!Fc1) { |
---|
721 | if (j > trigger_index || |
---|
722 | (j == trigger_index && small_trigger)) { |
---|
723 | |
---|
724 | cnt++; |
---|
725 | |
---|
726 | if (cnt > 10) { |
---|
727 | inc_red_fudge(); |
---|
728 | half_plus_fudge = 0.5 + red_fudge; |
---|
729 | cnt = 0; |
---|
730 | } |
---|
731 | } |
---|
732 | |
---|
733 | trigger_index = j; |
---|
734 | small_trigger = (t1 < 4); |
---|
735 | |
---|
736 | Fc1 = 1; |
---|
737 | RowTransformStart(B1[k], in_vec, in_float, n); |
---|
738 | } |
---|
739 | |
---|
740 | |
---|
741 | |
---|
742 | mu1 = mu[k][j]; |
---|
743 | if (mu1 >= 0) |
---|
744 | mu1 = ceil(mu1-half); |
---|
745 | else |
---|
746 | mu1 = floor(mu1+half); |
---|
747 | |
---|
748 | |
---|
749 | quad_float *mu_k = mu[k]; |
---|
750 | quad_float *mu_j = mu[j]; |
---|
751 | |
---|
752 | if (mu1 == 1) { |
---|
753 | for (i = 1; i <= j-1; i++) |
---|
754 | mu_k[i] -= mu_j[i]; |
---|
755 | } |
---|
756 | else if (mu1 == -1) { |
---|
757 | for (i = 1; i <= j-1; i++) |
---|
758 | mu_k[i] += mu_j[i]; |
---|
759 | } |
---|
760 | else { |
---|
761 | for (i = 1; i <= j-1; i++) |
---|
762 | mu_k[i] -= mu1*mu_j[i]; |
---|
763 | } |
---|
764 | |
---|
765 | // cout << j << " " << mu[k][j] << " " << mu1 << "\n"; |
---|
766 | |
---|
767 | mu_k[j] -= mu1; |
---|
768 | |
---|
769 | conv(MU, mu1); |
---|
770 | |
---|
771 | |
---|
772 | RowTransform(B(k), B(j), MU, B1[k], B1[j], in_vec, |
---|
773 | max_b[k], max_b[j], in_float); |
---|
774 | |
---|
775 | if (U) RowTransform((*U)(k), (*U)(j), MU); |
---|
776 | } |
---|
777 | } |
---|
778 | |
---|
779 | if (Fc1) { |
---|
780 | RowTransformFinish(B(k), B1[k], in_vec); |
---|
781 | max_b[k] = max_abs(B1[k], n); |
---|
782 | cache.touch(); |
---|
783 | GivensComputeGS(B1, mu, aux, k, n, cache); |
---|
784 | } |
---|
785 | } while (Fc1); |
---|
786 | |
---|
787 | if (check && (*check)(B(k))) |
---|
788 | quit = 1; |
---|
789 | |
---|
790 | if (IsZero(B(k))) { |
---|
791 | for (i = k; i < m; i++) { |
---|
792 | // swap i, i+1 |
---|
793 | swap(B(i), B(i+1)); |
---|
794 | tp = B1[i]; B1[i] = B1[i+1]; B1[i+1] = tp; |
---|
795 | dt1 = max_b[i]; max_b[i] = max_b[i+1]; max_b[i+1] = dt1; |
---|
796 | if (U) swap((*U)(i), (*U)(i+1)); |
---|
797 | } |
---|
798 | |
---|
799 | cache.flush(); |
---|
800 | |
---|
801 | m--; |
---|
802 | if (quit) break; |
---|
803 | continue; |
---|
804 | } |
---|
805 | |
---|
806 | if (quit) break; |
---|
807 | |
---|
808 | if (deep > 0) { |
---|
809 | // deep insertions |
---|
810 | |
---|
811 | Error("sorry...deep insertions not implemented"); |
---|
812 | } // end deep insertions |
---|
813 | |
---|
814 | // test LLL reduction condition |
---|
815 | |
---|
816 | if (k > 1 && |
---|
817 | sqrt(delta - mu[k][k-1]*mu[k][k-1])*fabs(mu[k-1][k-1]) > |
---|
818 | fabs(mu[k][k])) { |
---|
819 | |
---|
820 | // swap rows k, k-1 |
---|
821 | swap(B(k), B(k-1)); |
---|
822 | tp = B1[k]; B1[k] = B1[k-1]; B1[k-1] = tp; |
---|
823 | dt1 = max_b[k]; max_b[k] = max_b[k-1]; max_b[k-1] = dt1; |
---|
824 | if (U) swap((*U)(k), (*U)(k-1)); |
---|
825 | |
---|
826 | cache.swap(); |
---|
827 | |
---|
828 | k--; |
---|
829 | NumSwaps++; |
---|
830 | // cout << "- " << k << "\n"; |
---|
831 | } |
---|
832 | else { |
---|
833 | cache.incr(); |
---|
834 | k++; |
---|
835 | // cout << "+ " << k << "\n"; |
---|
836 | } |
---|
837 | } |
---|
838 | |
---|
839 | if (verbose) { |
---|
840 | G_LLLStatus(m+1, GetTime(), m, B); |
---|
841 | } |
---|
842 | |
---|
843 | |
---|
844 | delete [] max_b; |
---|
845 | |
---|
846 | return m; |
---|
847 | } |
---|
848 | |
---|
849 | static |
---|
850 | long G_LLL_QP(mat_ZZ& B, mat_ZZ* U, quad_float delta, long deep, |
---|
851 | LLLCheckFct check) |
---|
852 | { |
---|
853 | long m = B.NumRows(); |
---|
854 | long n = B.NumCols(); |
---|
855 | |
---|
856 | long i, j; |
---|
857 | long new_m, dep, quit; |
---|
858 | quad_float s; |
---|
859 | ZZ MU; |
---|
860 | quad_float mu1; |
---|
861 | |
---|
862 | quad_float t1; |
---|
863 | ZZ T1; |
---|
864 | |
---|
865 | init_red_fudge(); |
---|
866 | |
---|
867 | if (U) ident(*U, m); |
---|
868 | |
---|
869 | quad_float **B1; // approximates B |
---|
870 | |
---|
871 | typedef quad_float *quad_floatptr; |
---|
872 | |
---|
873 | B1 = NTL_NEW_OP quad_floatptr[m+1]; |
---|
874 | if (!B1) Error("G_LLL_QP: out of memory"); |
---|
875 | |
---|
876 | for (i = 1; i <= m; i++) { |
---|
877 | B1[i] = NTL_NEW_OP quad_float[n+1]; |
---|
878 | if (!B1[i]) Error("G_LLL_QP: out of memory"); |
---|
879 | } |
---|
880 | |
---|
881 | quad_float **mu; |
---|
882 | mu = NTL_NEW_OP quad_floatptr[m+1]; |
---|
883 | if (!mu) Error("G_LLL_QP: out of memory"); |
---|
884 | |
---|
885 | for (i = 1; i <= m; i++) { |
---|
886 | mu[i] = NTL_NEW_OP quad_float[n+2]; |
---|
887 | if (!mu[i]) Error("G_LLL_QP: out of memory"); |
---|
888 | } |
---|
889 | |
---|
890 | quad_float **aux; |
---|
891 | aux = NTL_NEW_OP quad_floatptr[m+1]; |
---|
892 | if (!aux) Error("G_LLL_QP: out of memory"); |
---|
893 | |
---|
894 | for (i = 1; i <= m; i++) { |
---|
895 | aux[i] = NTL_NEW_OP quad_float[n+1]; |
---|
896 | if (!aux[i]) Error("G_LLL_QP: out of memory"); |
---|
897 | } |
---|
898 | |
---|
899 | for (i = 1; i <=m; i++) |
---|
900 | for (j = 1; j <= n; j++) { |
---|
901 | conv(B1[i][j], B(i, j)); |
---|
902 | CheckFinite(&B1[i][j]); |
---|
903 | } |
---|
904 | |
---|
905 | |
---|
906 | GivensCache_QP cache(m, n); |
---|
907 | |
---|
908 | new_m = |
---|
909 | ll_G_LLL_QP(B, U, delta, deep, check, B1, mu, aux, m, 1, quit, cache); |
---|
910 | |
---|
911 | |
---|
912 | |
---|
913 | dep = m - new_m; |
---|
914 | m = new_m; |
---|
915 | |
---|
916 | if (dep > 0) { |
---|
917 | // for consistency, we move all of the zero rows to the front |
---|
918 | |
---|
919 | for (i = 0; i < m; i++) { |
---|
920 | swap(B(m+dep-i), B(m-i)); |
---|
921 | if (U) swap((*U)(m+dep-i), (*U)(m-i)); |
---|
922 | } |
---|
923 | } |
---|
924 | |
---|
925 | |
---|
926 | // clean-up |
---|
927 | |
---|
928 | for (i = 1; i <= m; i++) { |
---|
929 | delete [] B1[i]; |
---|
930 | } |
---|
931 | |
---|
932 | delete [] B1; |
---|
933 | |
---|
934 | for (i = 1; i <= m; i++) { |
---|
935 | delete [] mu[i]; |
---|
936 | } |
---|
937 | |
---|
938 | delete [] mu; |
---|
939 | |
---|
940 | for (i = 1; i <= m; i++) { |
---|
941 | delete [] aux[i]; |
---|
942 | } |
---|
943 | |
---|
944 | delete [] aux; |
---|
945 | |
---|
946 | return m; |
---|
947 | } |
---|
948 | |
---|
949 | |
---|
950 | |
---|
951 | long G_LLL_QP(mat_ZZ& B, double delta, long deep, LLLCheckFct check, |
---|
952 | long verb) |
---|
953 | { |
---|
954 | verbose = verb; |
---|
955 | NumSwaps = 0; |
---|
956 | if (verbose) { |
---|
957 | StartTime = GetTime(); |
---|
958 | LastTime = StartTime; |
---|
959 | } |
---|
960 | |
---|
961 | if (delta < 0.50 || delta >= 1) Error("G_LLL_QP: bad delta"); |
---|
962 | if (deep < 0) Error("G_LLL_QP: bad deep"); |
---|
963 | return G_LLL_QP(B, 0, to_quad_float(delta), deep, check); |
---|
964 | } |
---|
965 | |
---|
966 | long G_LLL_QP(mat_ZZ& B, mat_ZZ& U, double delta, long deep, |
---|
967 | LLLCheckFct check, long verb) |
---|
968 | { |
---|
969 | verbose = verb; |
---|
970 | NumSwaps = 0; |
---|
971 | if (verbose) { |
---|
972 | StartTime = GetTime(); |
---|
973 | LastTime = StartTime; |
---|
974 | } |
---|
975 | |
---|
976 | |
---|
977 | if (delta < 0.50 || delta >= 1) Error("G_LLL_QP: bad delta"); |
---|
978 | if (deep < 0) Error("G_LLL_QP: bad deep"); |
---|
979 | return G_LLL_QP(B, &U, to_quad_float(delta), deep, check); |
---|
980 | } |
---|
981 | |
---|
982 | |
---|
983 | |
---|
984 | static vec_quad_float G_BKZConstant; |
---|
985 | |
---|
986 | static |
---|
987 | void ComputeG_BKZConstant(long beta, long p) |
---|
988 | { |
---|
989 | const quad_float c_PI = |
---|
990 | to_quad_float("3.141592653589793238462643383279502884197"); |
---|
991 | const quad_float LogPI = |
---|
992 | to_quad_float("1.144729885849400174143427351353058711647"); |
---|
993 | |
---|
994 | G_BKZConstant.SetLength(beta-1); |
---|
995 | |
---|
996 | vec_quad_float Log; |
---|
997 | Log.SetLength(beta); |
---|
998 | |
---|
999 | |
---|
1000 | long i, j, k; |
---|
1001 | quad_float x, y; |
---|
1002 | |
---|
1003 | for (j = 1; j <= beta; j++) |
---|
1004 | Log(j) = log(to_quad_float(j)); |
---|
1005 | |
---|
1006 | for (i = 1; i <= beta-1; i++) { |
---|
1007 | // First, we compute x = gamma(i/2)^{2/i} |
---|
1008 | |
---|
1009 | k = i/2; |
---|
1010 | |
---|
1011 | if ((i & 1) == 0) { // i even |
---|
1012 | x = 0; |
---|
1013 | for (j = 1; j <= k; j++) |
---|
1014 | x = x + Log(j); |
---|
1015 | |
---|
1016 | x = x * (1/to_quad_float(k)); |
---|
1017 | |
---|
1018 | x = exp(x); |
---|
1019 | } |
---|
1020 | else { // i odd |
---|
1021 | x = 0; |
---|
1022 | for (j = k + 2; j <= 2*k + 2; j++) |
---|
1023 | x = x + Log(j); |
---|
1024 | |
---|
1025 | x = 0.5*LogPI + x - 2*(k+1)*Log(2); |
---|
1026 | |
---|
1027 | x = x * (2.0/to_quad_float(i)); |
---|
1028 | |
---|
1029 | x = exp(x); |
---|
1030 | } |
---|
1031 | |
---|
1032 | // Second, we compute y = 2^{2*p/i} |
---|
1033 | |
---|
1034 | y = -(2*p/to_quad_float(i))*Log(2); |
---|
1035 | y = exp(y); |
---|
1036 | |
---|
1037 | G_BKZConstant(i) = x*y/c_PI; |
---|
1038 | } |
---|
1039 | } |
---|
1040 | |
---|
1041 | static vec_quad_float G_BKZThresh; |
---|
1042 | |
---|
1043 | static |
---|
1044 | void ComputeG_BKZThresh(quad_float *c, long beta) |
---|
1045 | { |
---|
1046 | G_BKZThresh.SetLength(beta-1); |
---|
1047 | |
---|
1048 | long i; |
---|
1049 | quad_float x; |
---|
1050 | |
---|
1051 | x = 0; |
---|
1052 | |
---|
1053 | for (i = 1; i <= beta-1; i++) { |
---|
1054 | x += log(c[i-1]); |
---|
1055 | G_BKZThresh(i) = exp(x/to_quad_float(i))*G_BKZConstant(i); |
---|
1056 | if (!IsFinite(&G_BKZThresh(i))) G_BKZThresh(i) = 0; |
---|
1057 | } |
---|
1058 | } |
---|
1059 | |
---|
1060 | |
---|
1061 | static |
---|
1062 | void G_BKZStatus(double tt, double enum_time, unsigned long NumIterations, |
---|
1063 | unsigned long NumTrivial, unsigned long NumNonTrivial, |
---|
1064 | unsigned long NumNoOps, long m, |
---|
1065 | const mat_ZZ& B) |
---|
1066 | { |
---|
1067 | ZZ t1; |
---|
1068 | long i; |
---|
1069 | double prodlen = 0; |
---|
1070 | |
---|
1071 | for (i = 1; i <= m; i++) { |
---|
1072 | InnerProduct(t1, B(i), B(i)); |
---|
1073 | if (!IsZero(t1)) |
---|
1074 | prodlen += log(t1); |
---|
1075 | } |
---|
1076 | |
---|
1077 | LastTime = tt; |
---|
1078 | |
---|
1079 | } |
---|
1080 | |
---|
1081 | |
---|
1082 | static |
---|
1083 | long G_BKZ_QP(mat_ZZ& BB, mat_ZZ* UU, quad_float delta, |
---|
1084 | long beta, long prune, LLLCheckFct check) |
---|
1085 | { |
---|
1086 | |
---|
1087 | long m = BB.NumRows(); |
---|
1088 | long n = BB.NumCols(); |
---|
1089 | long m_orig = m; |
---|
1090 | |
---|
1091 | long i, j; |
---|
1092 | ZZ MU; |
---|
1093 | |
---|
1094 | quad_float t1; |
---|
1095 | ZZ T1; |
---|
1096 | quad_float *tp; |
---|
1097 | |
---|
1098 | init_red_fudge(); |
---|
1099 | |
---|
1100 | mat_ZZ B; |
---|
1101 | B = BB; |
---|
1102 | |
---|
1103 | B.SetDims(m+1, n); |
---|
1104 | |
---|
1105 | |
---|
1106 | quad_float **B1; // approximates B |
---|
1107 | |
---|
1108 | typedef quad_float *quad_floatptr; |
---|
1109 | |
---|
1110 | B1 = NTL_NEW_OP quad_floatptr[m+2]; |
---|
1111 | if (!B1) Error("G_BKZ_QP: out of memory"); |
---|
1112 | |
---|
1113 | for (i = 1; i <= m+1; i++) { |
---|
1114 | B1[i] = NTL_NEW_OP quad_float[n+1]; |
---|
1115 | if (!B1[i]) Error("G_BKZ_QP: out of memory"); |
---|
1116 | } |
---|
1117 | |
---|
1118 | quad_float **mu; |
---|
1119 | mu = NTL_NEW_OP quad_floatptr[m+2]; |
---|
1120 | if (!mu) Error("G_BKZ_QP: out of memory"); |
---|
1121 | |
---|
1122 | for (i = 1; i <= m+1; i++) { |
---|
1123 | mu[i] = NTL_NEW_OP quad_float[n+2]; |
---|
1124 | if (!mu[i]) Error("G_BKZ_QP: out of memory"); |
---|
1125 | } |
---|
1126 | |
---|
1127 | quad_float **aux; |
---|
1128 | aux = NTL_NEW_OP quad_floatptr[m+2]; |
---|
1129 | if (!aux) Error("G_BKZ_QP: out of memory"); |
---|
1130 | |
---|
1131 | for (i = 1; i <= m+1; i++) { |
---|
1132 | aux[i] = NTL_NEW_OP quad_float[n+1]; |
---|
1133 | if (!aux[i]) Error("G_BKZ_QP: out of memory"); |
---|
1134 | } |
---|
1135 | |
---|
1136 | quad_float *c; // squared lengths of Gramm-Schmidt basis vectors |
---|
1137 | |
---|
1138 | c = NTL_NEW_OP quad_float[m+2]; |
---|
1139 | if (!c) Error("G_BKZ_QP: out of memory"); |
---|
1140 | |
---|
1141 | quad_float cbar; |
---|
1142 | |
---|
1143 | quad_float *ctilda; |
---|
1144 | ctilda = NTL_NEW_OP quad_float[m+2]; |
---|
1145 | if (!ctilda) Error("G_BKZ_QP: out of memory"); |
---|
1146 | |
---|
1147 | quad_float *vvec; |
---|
1148 | vvec = NTL_NEW_OP quad_float[m+2]; |
---|
1149 | if (!vvec) Error("G_BKZ_QP: out of memory"); |
---|
1150 | |
---|
1151 | quad_float *yvec; |
---|
1152 | yvec = NTL_NEW_OP quad_float[m+2]; |
---|
1153 | if (!yvec) Error("G_BKZ_QP: out of memory"); |
---|
1154 | |
---|
1155 | quad_float *uvec; |
---|
1156 | uvec = NTL_NEW_OP quad_float[m+2]; |
---|
1157 | if (!uvec) Error("G_BKZ_QP: out of memory"); |
---|
1158 | |
---|
1159 | quad_float *utildavec; |
---|
1160 | utildavec = NTL_NEW_OP quad_float[m+2]; |
---|
1161 | if (!utildavec) Error("G_BKZ_QP: out of memory"); |
---|
1162 | |
---|
1163 | |
---|
1164 | long *Deltavec; |
---|
1165 | Deltavec = NTL_NEW_OP long[m+2]; |
---|
1166 | if (!Deltavec) Error("G_BKZ_QP: out of memory"); |
---|
1167 | |
---|
1168 | long *deltavec; |
---|
1169 | deltavec = NTL_NEW_OP long[m+2]; |
---|
1170 | if (!deltavec) Error("G_BKZ_QP: out of memory"); |
---|
1171 | |
---|
1172 | mat_ZZ Ulocal; |
---|
1173 | mat_ZZ *U; |
---|
1174 | |
---|
1175 | if (UU) { |
---|
1176 | Ulocal.SetDims(m+1, m); |
---|
1177 | for (i = 1; i <= m; i++) |
---|
1178 | conv(Ulocal(i, i), 1); |
---|
1179 | U = &Ulocal; |
---|
1180 | } |
---|
1181 | else |
---|
1182 | U = 0; |
---|
1183 | |
---|
1184 | long quit; |
---|
1185 | long new_m; |
---|
1186 | long z, jj, kk; |
---|
1187 | long s, t; |
---|
1188 | long h; |
---|
1189 | quad_float eta; |
---|
1190 | |
---|
1191 | |
---|
1192 | for (i = 1; i <=m; i++) |
---|
1193 | for (j = 1; j <= n; j++) { |
---|
1194 | conv(B1[i][j], B(i, j)); |
---|
1195 | CheckFinite(&B1[i][j]); |
---|
1196 | } |
---|
1197 | |
---|
1198 | |
---|
1199 | GivensCache_QP cache(m, n); |
---|
1200 | |
---|
1201 | m = ll_G_LLL_QP(B, U, delta, 0, check, B1, mu, aux, m, 1, quit, cache); |
---|
1202 | |
---|
1203 | double tt; |
---|
1204 | |
---|
1205 | double enum_time = 0; |
---|
1206 | unsigned long NumIterations = 0; |
---|
1207 | unsigned long NumTrivial = 0; |
---|
1208 | unsigned long NumNonTrivial = 0; |
---|
1209 | unsigned long NumNoOps = 0; |
---|
1210 | |
---|
1211 | long verb = verbose; |
---|
1212 | |
---|
1213 | verbose = 0; |
---|
1214 | |
---|
1215 | long clean = 1; |
---|
1216 | |
---|
1217 | if (m < m_orig) { |
---|
1218 | for (i = m_orig+1; i >= m+2; i--) { |
---|
1219 | // swap i, i-1 |
---|
1220 | |
---|
1221 | swap(B(i), B(i-1)); |
---|
1222 | if (U) swap((*U)(i), (*U)(i-1)); |
---|
1223 | } |
---|
1224 | } |
---|
1225 | |
---|
1226 | if (!quit && m > 1) { |
---|
1227 | // cerr << "continuing\n"; |
---|
1228 | if (beta > m) beta = m; |
---|
1229 | |
---|
1230 | if (prune > 0) |
---|
1231 | ComputeG_BKZConstant(beta, prune); |
---|
1232 | |
---|
1233 | z = 0; |
---|
1234 | jj = 0; |
---|
1235 | |
---|
1236 | while (z < m-1) { |
---|
1237 | jj++; |
---|
1238 | kk = min(jj+beta-1, m); |
---|
1239 | |
---|
1240 | if (jj == m) { |
---|
1241 | jj = 1; |
---|
1242 | kk = beta; |
---|
1243 | clean = 1; |
---|
1244 | } |
---|
1245 | |
---|
1246 | if (verb) { |
---|
1247 | tt = GetTime(); |
---|
1248 | if (tt > LastTime + LLLStatusInterval) |
---|
1249 | G_BKZStatus(tt, enum_time, NumIterations, NumTrivial, |
---|
1250 | NumNonTrivial, NumNoOps, m, B); |
---|
1251 | } |
---|
1252 | |
---|
1253 | |
---|
1254 | |
---|
1255 | |
---|
1256 | // ENUM |
---|
1257 | |
---|
1258 | double tt1; |
---|
1259 | |
---|
1260 | if (verb) { |
---|
1261 | tt1 = GetTime(); |
---|
1262 | } |
---|
1263 | |
---|
1264 | for (i = jj; i <= kk; i++) { |
---|
1265 | c[i] = mu[i][i]*mu[i][i]; |
---|
1266 | CheckFinite(&c[i]); |
---|
1267 | } |
---|
1268 | |
---|
1269 | if (prune > 0) |
---|
1270 | ComputeG_BKZThresh(&c[jj], kk-jj+1); |
---|
1271 | |
---|
1272 | |
---|
1273 | cbar = c[jj]; |
---|
1274 | utildavec[jj] = uvec[jj] = 1; |
---|
1275 | |
---|
1276 | yvec[jj] = vvec[jj] = 0; |
---|
1277 | Deltavec[jj] = 0; |
---|
1278 | |
---|
1279 | |
---|
1280 | s = t = jj; |
---|
1281 | deltavec[jj] = 1; |
---|
1282 | |
---|
1283 | for (i = jj+1; i <= kk+1; i++) { |
---|
1284 | ctilda[i] = uvec[i] = utildavec[i] = yvec[i] = 0; |
---|
1285 | Deltavec[i] = 0; |
---|
1286 | vvec[i] = 0; |
---|
1287 | deltavec[i] = 1; |
---|
1288 | } |
---|
1289 | |
---|
1290 | long enum_cnt = 0; |
---|
1291 | |
---|
1292 | while (t <= kk) { |
---|
1293 | if (verb) { |
---|
1294 | enum_cnt++; |
---|
1295 | if (enum_cnt > 100000) { |
---|
1296 | enum_cnt = 0; |
---|
1297 | tt = GetTime(); |
---|
1298 | if (tt > LastTime + LLLStatusInterval) { |
---|
1299 | enum_time += tt - tt1; |
---|
1300 | tt1 = tt; |
---|
1301 | G_BKZStatus(tt, enum_time, NumIterations, NumTrivial, |
---|
1302 | NumNonTrivial, NumNoOps, m, B); |
---|
1303 | } |
---|
1304 | } |
---|
1305 | } |
---|
1306 | |
---|
1307 | ctilda[t] = ctilda[t+1] + |
---|
1308 | (yvec[t]+utildavec[t])*(yvec[t]+utildavec[t])*c[t]; |
---|
1309 | |
---|
1310 | if (prune > 0 && t > jj) { |
---|
1311 | eta = G_BKZThresh(t-jj); |
---|
1312 | } |
---|
1313 | else |
---|
1314 | eta = 0; |
---|
1315 | |
---|
1316 | if (ctilda[t] < cbar - eta) { |
---|
1317 | if (t > jj) { |
---|
1318 | t--; |
---|
1319 | t1 = 0; |
---|
1320 | for (i = t+1; i <= s; i++) { |
---|
1321 | t1 += utildavec[i]*mu[i][t]; |
---|
1322 | } |
---|
1323 | |
---|
1324 | |
---|
1325 | yvec[t] = t1; |
---|
1326 | t1 = -t1; |
---|
1327 | if (t1 >= 0) |
---|
1328 | t1 = ceil(t1-0.5); |
---|
1329 | else |
---|
1330 | t1 = floor(t1+0.5); |
---|
1331 | |
---|
1332 | utildavec[t] = vvec[t] = t1; |
---|
1333 | Deltavec[t] = 0; |
---|
1334 | if (utildavec[t] > -yvec[t]) |
---|
1335 | deltavec[t] = -1; |
---|
1336 | else |
---|
1337 | deltavec[t] = 1; |
---|
1338 | } |
---|
1339 | else { |
---|
1340 | cbar = ctilda[jj]; |
---|
1341 | for (i = jj; i <= kk; i++) { |
---|
1342 | uvec[i] = utildavec[i]; |
---|
1343 | } |
---|
1344 | } |
---|
1345 | } |
---|
1346 | else { |
---|
1347 | t++; |
---|
1348 | s = max(s, t); |
---|
1349 | if (t < s) Deltavec[t] = -Deltavec[t]; |
---|
1350 | if (Deltavec[t]*deltavec[t] >= 0) Deltavec[t] += deltavec[t]; |
---|
1351 | utildavec[t] = vvec[t] + Deltavec[t]; |
---|
1352 | } |
---|
1353 | } |
---|
1354 | |
---|
1355 | if (verb) { |
---|
1356 | tt1 = GetTime() - tt1; |
---|
1357 | enum_time += tt1; |
---|
1358 | } |
---|
1359 | |
---|
1360 | NumIterations++; |
---|
1361 | |
---|
1362 | h = min(kk+1, m); |
---|
1363 | |
---|
1364 | if ((delta-8*red_fudge)*c[jj] > cbar) { |
---|
1365 | |
---|
1366 | clean = 0; |
---|
1367 | |
---|
1368 | // we treat the case that the new vector is b_s (jj < s <= kk) |
---|
1369 | // as a special case that appears to occur most of the time. |
---|
1370 | |
---|
1371 | s = 0; |
---|
1372 | for (i = jj+1; i <= kk; i++) { |
---|
1373 | if (uvec[i] != 0) { |
---|
1374 | if (s == 0) |
---|
1375 | s = i; |
---|
1376 | else |
---|
1377 | s = -1; |
---|
1378 | } |
---|
1379 | } |
---|
1380 | |
---|
1381 | if (s == 0) Error("G_BKZ_QP: internal error"); |
---|
1382 | |
---|
1383 | if (s > 0) { |
---|
1384 | // special case |
---|
1385 | |
---|
1386 | NumTrivial++; |
---|
1387 | |
---|
1388 | for (i = s; i > jj; i--) { |
---|
1389 | // swap i, i-1 |
---|
1390 | swap(B(i-1), B(i)); |
---|
1391 | if (U) swap((*U)(i-1), (*U)(i)); |
---|
1392 | tp = B1[i-1]; B1[i-1] = B1[i]; B1[i] = tp; |
---|
1393 | } |
---|
1394 | |
---|
1395 | // cerr << "special case\n"; |
---|
1396 | new_m = ll_G_LLL_QP(B, U, delta, 0, check, |
---|
1397 | B1, mu, aux, h, jj, quit, cache); |
---|
1398 | if (new_m != h) Error("G_BKZ_QP: internal error"); |
---|
1399 | if (quit) break; |
---|
1400 | } |
---|
1401 | else { |
---|
1402 | // the general case |
---|
1403 | |
---|
1404 | NumNonTrivial++; |
---|
1405 | |
---|
1406 | |
---|
1407 | for (i = 1; i <= n; i++) conv(B(m+1, i), 0); |
---|
1408 | |
---|
1409 | if (U) { |
---|
1410 | for (i = 1; i <= m_orig; i++) |
---|
1411 | conv((*U)(m+1, i), 0); |
---|
1412 | } |
---|
1413 | |
---|
1414 | for (i = jj; i <= kk; i++) { |
---|
1415 | if (uvec[i] == 0) continue; |
---|
1416 | conv(MU, uvec[i]); |
---|
1417 | RowTransform2(B(m+1), B(i), MU); |
---|
1418 | if (U) RowTransform2((*U)(m+1), (*U)(i), MU); |
---|
1419 | } |
---|
1420 | |
---|
1421 | for (i = m+1; i >= jj+1; i--) { |
---|
1422 | // swap i, i-1 |
---|
1423 | swap(B(i-1), B(i)); |
---|
1424 | if (U) swap((*U)(i-1), (*U)(i)); |
---|
1425 | tp = B1[i-1]; B1[i-1] = B1[i]; B1[i] = tp; |
---|
1426 | } |
---|
1427 | |
---|
1428 | for (i = 1; i <= n; i++) { |
---|
1429 | conv(B1[jj][i], B(jj, i)); |
---|
1430 | CheckFinite(&B1[jj][i]); |
---|
1431 | } |
---|
1432 | |
---|
1433 | if (IsZero(B(jj))) Error("G_BKZ_QP: internal error"); |
---|
1434 | |
---|
1435 | // remove linear dependencies |
---|
1436 | |
---|
1437 | // cerr << "general case\n"; |
---|
1438 | new_m = ll_G_LLL_QP(B, U, delta, 0, 0, B1, mu, aux, |
---|
1439 | kk+1, jj, quit, cache); |
---|
1440 | |
---|
1441 | if (new_m != kk) Error("G_BKZ_QP: internal error"); |
---|
1442 | |
---|
1443 | // remove zero vector |
---|
1444 | |
---|
1445 | for (i = kk+2; i <= m+1; i++) { |
---|
1446 | // swap i, i-1 |
---|
1447 | swap(B(i-1), B(i)); |
---|
1448 | if (U) swap((*U)(i-1), (*U)(i)); |
---|
1449 | tp = B1[i-1]; B1[i-1] = B1[i]; B1[i] = tp; |
---|
1450 | } |
---|
1451 | |
---|
1452 | quit = 0; |
---|
1453 | if (check) { |
---|
1454 | for (i = 1; i <= kk; i++) |
---|
1455 | if ((*check)(B(i))) { |
---|
1456 | quit = 1; |
---|
1457 | break; |
---|
1458 | } |
---|
1459 | } |
---|
1460 | |
---|
1461 | if (quit) break; |
---|
1462 | |
---|
1463 | if (h > kk) { |
---|
1464 | // extend reduced basis |
---|
1465 | |
---|
1466 | new_m = ll_G_LLL_QP(B, U, delta, 0, check, |
---|
1467 | B1, mu, aux, h, h, quit, cache); |
---|
1468 | |
---|
1469 | if (new_m != h) Error("G_BKZ_QP: internal error"); |
---|
1470 | if (quit) break; |
---|
1471 | } |
---|
1472 | } |
---|
1473 | |
---|
1474 | z = 0; |
---|
1475 | } |
---|
1476 | else { |
---|
1477 | // G_LLL_QP |
---|
1478 | // cerr << "progress\n"; |
---|
1479 | |
---|
1480 | NumNoOps++; |
---|
1481 | |
---|
1482 | |
---|
1483 | if (!clean) { |
---|
1484 | new_m = |
---|
1485 | ll_G_LLL_QP(B, U, delta, 0, check, B1, mu, aux, |
---|
1486 | h, h, quit, cache); |
---|
1487 | if (new_m != h) Error("G_BKZ_QP: internal error"); |
---|
1488 | if (quit) break; |
---|
1489 | } |
---|
1490 | |
---|
1491 | z++; |
---|
1492 | } |
---|
1493 | } |
---|
1494 | } |
---|
1495 | |
---|
1496 | |
---|
1497 | if (verb) { |
---|
1498 | G_BKZStatus(GetTime(), enum_time, NumIterations, NumTrivial, NumNonTrivial, |
---|
1499 | NumNoOps, m, B); |
---|
1500 | } |
---|
1501 | |
---|
1502 | |
---|
1503 | // clean up |
---|
1504 | |
---|
1505 | |
---|
1506 | if (m_orig > m) { |
---|
1507 | // for consistency, we move zero vectors to the front |
---|
1508 | |
---|
1509 | for (i = m+1; i <= m_orig; i++) { |
---|
1510 | swap(B(i), B(i+1)); |
---|
1511 | if (U) swap((*U)(i), (*U)(i+1)); |
---|
1512 | } |
---|
1513 | |
---|
1514 | for (i = 0; i < m; i++) { |
---|
1515 | swap(B(m_orig-i), B(m-i)); |
---|
1516 | if (U) swap((*U)(m_orig-i), (*U)(m-i)); |
---|
1517 | } |
---|
1518 | } |
---|
1519 | |
---|
1520 | B.SetDims(m_orig, n); |
---|
1521 | BB = B; |
---|
1522 | |
---|
1523 | if (U) { |
---|
1524 | U->SetDims(m_orig, m_orig); |
---|
1525 | *UU = *U; |
---|
1526 | } |
---|
1527 | |
---|
1528 | for (i = 1; i <= m+1; i++) { |
---|
1529 | delete [] B1[i]; |
---|
1530 | } |
---|
1531 | |
---|
1532 | delete [] B1; |
---|
1533 | |
---|
1534 | for (i = 1; i <= m+1; i++) { |
---|
1535 | delete [] mu[i]; |
---|
1536 | } |
---|
1537 | |
---|
1538 | delete [] mu; |
---|
1539 | |
---|
1540 | for (i = 1; i <= m+1; i++) { |
---|
1541 | delete [] aux[i]; |
---|
1542 | } |
---|
1543 | |
---|
1544 | delete [] aux; |
---|
1545 | |
---|
1546 | |
---|
1547 | delete [] c; |
---|
1548 | delete [] ctilda; |
---|
1549 | delete [] vvec; |
---|
1550 | delete [] yvec; |
---|
1551 | delete [] uvec; |
---|
1552 | delete [] utildavec; |
---|
1553 | delete [] Deltavec; |
---|
1554 | delete [] deltavec; |
---|
1555 | |
---|
1556 | return m; |
---|
1557 | } |
---|
1558 | |
---|
1559 | long G_BKZ_QP(mat_ZZ& BB, mat_ZZ& UU, double delta, |
---|
1560 | long beta, long prune, LLLCheckFct check, long verb) |
---|
1561 | { |
---|
1562 | verbose = verb; |
---|
1563 | NumSwaps = 0; |
---|
1564 | if (verbose) { |
---|
1565 | StartTime = GetTime(); |
---|
1566 | LastTime = StartTime; |
---|
1567 | } |
---|
1568 | |
---|
1569 | |
---|
1570 | if (delta < 0.50 || delta >= 1) Error("G_BKZ_QP: bad delta"); |
---|
1571 | if (beta < 2) Error("G_BKZ_QP: bad block size"); |
---|
1572 | |
---|
1573 | return G_BKZ_QP(BB, &UU, to_quad_float(delta), beta, prune, check); |
---|
1574 | } |
---|
1575 | |
---|
1576 | long G_BKZ_QP(mat_ZZ& BB, double delta, |
---|
1577 | long beta, long prune, LLLCheckFct check, long verb) |
---|
1578 | { |
---|
1579 | verbose = verb; |
---|
1580 | NumSwaps = 0; |
---|
1581 | if (verbose) { |
---|
1582 | StartTime = GetTime(); |
---|
1583 | LastTime = StartTime; |
---|
1584 | } |
---|
1585 | |
---|
1586 | |
---|
1587 | |
---|
1588 | if (delta < 0.50 || delta >= 1) Error("G_BKZ_QP: bad delta"); |
---|
1589 | if (beta < 2) Error("G_BKZ_QP: bad block size"); |
---|
1590 | |
---|
1591 | return G_BKZ_QP(BB, 0, to_quad_float(delta), beta, prune, check); |
---|
1592 | } |
---|
1593 | |
---|
1594 | |
---|
1595 | |
---|
1596 | static |
---|
1597 | long G_BKZ_QP1(mat_ZZ& BB, mat_ZZ* UU, quad_float delta, |
---|
1598 | long beta, long prune, LLLCheckFct check) |
---|
1599 | { |
---|
1600 | |
---|
1601 | long m = BB.NumRows(); |
---|
1602 | long n = BB.NumCols(); |
---|
1603 | long m_orig = m; |
---|
1604 | |
---|
1605 | long i, j; |
---|
1606 | ZZ MU; |
---|
1607 | |
---|
1608 | ZZ T1; |
---|
1609 | quad_float *tp; |
---|
1610 | |
---|
1611 | init_red_fudge(); |
---|
1612 | |
---|
1613 | mat_ZZ B; |
---|
1614 | B = BB; |
---|
1615 | |
---|
1616 | B.SetDims(m+1, n); |
---|
1617 | |
---|
1618 | |
---|
1619 | quad_float **B1; // approximates B |
---|
1620 | |
---|
1621 | typedef quad_float *quad_floatptr; |
---|
1622 | |
---|
1623 | B1 = NTL_NEW_OP quad_floatptr[m+2]; |
---|
1624 | if (!B1) Error("G_BKZ_QP: out of memory"); |
---|
1625 | |
---|
1626 | for (i = 1; i <= m+1; i++) { |
---|
1627 | B1[i] = NTL_NEW_OP quad_float[n+1]; |
---|
1628 | if (!B1[i]) Error("G_BKZ_QP: out of memory"); |
---|
1629 | } |
---|
1630 | |
---|
1631 | quad_float **mu; |
---|
1632 | mu = NTL_NEW_OP quad_floatptr[m+2]; |
---|
1633 | if (!mu) Error("G_BKZ_QP: out of memory"); |
---|
1634 | |
---|
1635 | for (i = 1; i <= m+1; i++) { |
---|
1636 | mu[i] = NTL_NEW_OP quad_float[n+2]; |
---|
1637 | if (!mu[i]) Error("G_BKZ_QP: out of memory"); |
---|
1638 | } |
---|
1639 | |
---|
1640 | quad_float **aux; |
---|
1641 | aux = NTL_NEW_OP quad_floatptr[m+2]; |
---|
1642 | if (!aux) Error("G_BKZ_QP: out of memory"); |
---|
1643 | |
---|
1644 | for (i = 1; i <= m+1; i++) { |
---|
1645 | aux[i] = NTL_NEW_OP quad_float[n+1]; |
---|
1646 | if (!aux[i]) Error("G_BKZ_QP: out of memory"); |
---|
1647 | } |
---|
1648 | |
---|
1649 | quad_float *c; // squared lengths of Gramm-Schmidt basis vectors |
---|
1650 | |
---|
1651 | c = NTL_NEW_OP quad_float[m+2]; |
---|
1652 | if (!c) Error("G_BKZ_QP: out of memory"); |
---|
1653 | |
---|
1654 | double cbar; |
---|
1655 | |
---|
1656 | double *ctilda; |
---|
1657 | ctilda = NTL_NEW_OP double[m+2]; |
---|
1658 | if (!ctilda) Error("G_BKZ_QP: out of memory"); |
---|
1659 | |
---|
1660 | double *vvec; |
---|
1661 | vvec = NTL_NEW_OP double[m+2]; |
---|
1662 | if (!vvec) Error("G_BKZ_QP: out of memory"); |
---|
1663 | |
---|
1664 | double *yvec; |
---|
1665 | yvec = NTL_NEW_OP double[m+2]; |
---|
1666 | if (!yvec) Error("G_BKZ_QP: out of memory"); |
---|
1667 | |
---|
1668 | double *uvec; |
---|
1669 | uvec = NTL_NEW_OP double[m+2]; |
---|
1670 | if (!uvec) Error("G_BKZ_QP: out of memory"); |
---|
1671 | |
---|
1672 | double *utildavec; |
---|
1673 | utildavec = NTL_NEW_OP double[m+2]; |
---|
1674 | if (!utildavec) Error("G_BKZ_QP: out of memory"); |
---|
1675 | |
---|
1676 | |
---|
1677 | long *Deltavec; |
---|
1678 | Deltavec = NTL_NEW_OP long[m+2]; |
---|
1679 | if (!Deltavec) Error("G_BKZ_QP: out of memory"); |
---|
1680 | |
---|
1681 | long *deltavec; |
---|
1682 | deltavec = NTL_NEW_OP long[m+2]; |
---|
1683 | if (!deltavec) Error("G_BKZ_QP: out of memory"); |
---|
1684 | |
---|
1685 | mat_ZZ Ulocal; |
---|
1686 | mat_ZZ *U; |
---|
1687 | |
---|
1688 | if (UU) { |
---|
1689 | Ulocal.SetDims(m+1, m); |
---|
1690 | for (i = 1; i <= m; i++) |
---|
1691 | conv(Ulocal(i, i), 1); |
---|
1692 | U = &Ulocal; |
---|
1693 | } |
---|
1694 | else |
---|
1695 | U = 0; |
---|
1696 | |
---|
1697 | long quit; |
---|
1698 | long new_m; |
---|
1699 | long z, jj, kk; |
---|
1700 | long s, t; |
---|
1701 | long h; |
---|
1702 | |
---|
1703 | double eta; |
---|
1704 | |
---|
1705 | for (i = 1; i <=m; i++) |
---|
1706 | for (j = 1; j <= n; j++) { |
---|
1707 | conv(B1[i][j], B(i, j)); |
---|
1708 | CheckFinite(&B1[i][j]); |
---|
1709 | } |
---|
1710 | |
---|
1711 | |
---|
1712 | GivensCache_QP cache(m, n); |
---|
1713 | |
---|
1714 | m = ll_G_LLL_QP(B, U, delta, 0, check, B1, mu, aux, m, 1, quit, cache); |
---|
1715 | |
---|
1716 | |
---|
1717 | |
---|
1718 | double tt; |
---|
1719 | |
---|
1720 | double enum_time = 0; |
---|
1721 | unsigned long NumIterations = 0; |
---|
1722 | unsigned long NumTrivial = 0; |
---|
1723 | unsigned long NumNonTrivial = 0; |
---|
1724 | unsigned long NumNoOps = 0; |
---|
1725 | |
---|
1726 | long verb = verbose; |
---|
1727 | |
---|
1728 | verbose = 0; |
---|
1729 | |
---|
1730 | long clean = 1; |
---|
1731 | |
---|
1732 | if (m < m_orig) { |
---|
1733 | for (i = m_orig+1; i >= m+2; i--) { |
---|
1734 | // swap i, i-1 |
---|
1735 | |
---|
1736 | swap(B(i), B(i-1)); |
---|
1737 | if (U) swap((*U)(i), (*U)(i-1)); |
---|
1738 | } |
---|
1739 | } |
---|
1740 | |
---|
1741 | if (!quit && m > 1) { |
---|
1742 | // cerr << "continuing\n"; |
---|
1743 | if (beta > m) beta = m; |
---|
1744 | |
---|
1745 | if (prune > 0) |
---|
1746 | ComputeG_BKZConstant(beta, prune); |
---|
1747 | |
---|
1748 | z = 0; |
---|
1749 | jj = 0; |
---|
1750 | |
---|
1751 | while (z < m-1) { |
---|
1752 | jj++; |
---|
1753 | kk = min(jj+beta-1, m); |
---|
1754 | |
---|
1755 | if (jj == m) { |
---|
1756 | jj = 1; |
---|
1757 | kk = beta; |
---|
1758 | clean = 1; |
---|
1759 | } |
---|
1760 | |
---|
1761 | if (verb) { |
---|
1762 | tt = GetTime(); |
---|
1763 | if (tt > LastTime + LLLStatusInterval) |
---|
1764 | G_BKZStatus(tt, enum_time, NumIterations, NumTrivial, |
---|
1765 | NumNonTrivial, NumNoOps, m, B); |
---|
1766 | } |
---|
1767 | |
---|
1768 | |
---|
1769 | |
---|
1770 | |
---|
1771 | // ENUM |
---|
1772 | |
---|
1773 | double tt1; |
---|
1774 | |
---|
1775 | if (verb) { |
---|
1776 | tt1 = GetTime(); |
---|
1777 | } |
---|
1778 | |
---|
1779 | for (i = jj; i <= kk; i++) { |
---|
1780 | c[i] = mu[i][i]*mu[i][i]; |
---|
1781 | CheckFinite(&c[i]); |
---|
1782 | } |
---|
1783 | |
---|
1784 | if (prune > 0) |
---|
1785 | ComputeG_BKZThresh(&c[jj], kk-jj+1); |
---|
1786 | |
---|
1787 | |
---|
1788 | cbar = to_double(c[jj]); |
---|
1789 | utildavec[jj] = uvec[jj] = 1; |
---|
1790 | |
---|
1791 | yvec[jj] = vvec[jj] = 0; |
---|
1792 | Deltavec[jj] = 0; |
---|
1793 | |
---|
1794 | |
---|
1795 | s = t = jj; |
---|
1796 | deltavec[jj] = 1; |
---|
1797 | |
---|
1798 | for (i = jj+1; i <= kk+1; i++) { |
---|
1799 | ctilda[i] = uvec[i] = utildavec[i] = yvec[i] = 0; |
---|
1800 | Deltavec[i] = 0; |
---|
1801 | vvec[i] = 0; |
---|
1802 | deltavec[i] = 1; |
---|
1803 | } |
---|
1804 | |
---|
1805 | long enum_cnt = 0; |
---|
1806 | |
---|
1807 | while (t <= kk) { |
---|
1808 | if (verb) { |
---|
1809 | enum_cnt++; |
---|
1810 | if (enum_cnt > 100000) { |
---|
1811 | enum_cnt = 0; |
---|
1812 | tt = GetTime(); |
---|
1813 | if (tt > LastTime + LLLStatusInterval) { |
---|
1814 | enum_time += tt - tt1; |
---|
1815 | tt1 = tt; |
---|
1816 | G_BKZStatus(tt, enum_time, NumIterations, NumTrivial, |
---|
1817 | NumNonTrivial, NumNoOps, m, B); |
---|
1818 | } |
---|
1819 | } |
---|
1820 | } |
---|
1821 | |
---|
1822 | ctilda[t] = ctilda[t+1] + |
---|
1823 | (yvec[t]+utildavec[t])*(yvec[t]+utildavec[t])*to_double(c[t]); |
---|
1824 | |
---|
1825 | if (prune > 0 && t > jj) { |
---|
1826 | eta = to_double(G_BKZThresh(t-jj)); |
---|
1827 | } |
---|
1828 | else |
---|
1829 | eta = 0; |
---|
1830 | |
---|
1831 | if (ctilda[t] < cbar - eta) { |
---|
1832 | if (t > jj) { |
---|
1833 | double t1; |
---|
1834 | |
---|
1835 | t--; |
---|
1836 | t1 = 0; |
---|
1837 | for (i = t+1; i <= s; i++) { |
---|
1838 | t1 += utildavec[i]*to_double(mu[i][t]); |
---|
1839 | } |
---|
1840 | |
---|
1841 | |
---|
1842 | yvec[t] = t1; |
---|
1843 | t1 = -t1; |
---|
1844 | if (t1 >= 0) |
---|
1845 | t1 = ceil(t1-0.5); |
---|
1846 | else |
---|
1847 | t1 = floor(t1+0.5); |
---|
1848 | |
---|
1849 | utildavec[t] = vvec[t] = t1; |
---|
1850 | Deltavec[t] = 0; |
---|
1851 | if (utildavec[t] > -yvec[t]) |
---|
1852 | deltavec[t] = -1; |
---|
1853 | else |
---|
1854 | deltavec[t] = 1; |
---|
1855 | } |
---|
1856 | else { |
---|
1857 | cbar = ctilda[jj]; |
---|
1858 | for (i = jj; i <= kk; i++) { |
---|
1859 | uvec[i] = utildavec[i]; |
---|
1860 | } |
---|
1861 | } |
---|
1862 | } |
---|
1863 | else { |
---|
1864 | t++; |
---|
1865 | s = max(s, t); |
---|
1866 | if (t < s) Deltavec[t] = -Deltavec[t]; |
---|
1867 | if (Deltavec[t]*deltavec[t] >= 0) Deltavec[t] += deltavec[t]; |
---|
1868 | utildavec[t] = vvec[t] + Deltavec[t]; |
---|
1869 | } |
---|
1870 | } |
---|
1871 | |
---|
1872 | if (verb) { |
---|
1873 | tt1 = GetTime() - tt1; |
---|
1874 | enum_time += tt1; |
---|
1875 | } |
---|
1876 | |
---|
1877 | NumIterations++; |
---|
1878 | |
---|
1879 | h = min(kk+1, m); |
---|
1880 | |
---|
1881 | quad_float t1; |
---|
1882 | |
---|
1883 | if ((delta-8*red_fudge)*c[jj] > cbar*(1+64/NTL_FDOUBLE_PRECISION)) { |
---|
1884 | |
---|
1885 | clean = 0; |
---|
1886 | |
---|
1887 | // we treat the case that the new vector is b_s (jj < s <= kk) |
---|
1888 | // as a special case that appears to occur most of the time. |
---|
1889 | |
---|
1890 | s = 0; |
---|
1891 | for (i = jj+1; i <= kk; i++) { |
---|
1892 | if (uvec[i] != 0) { |
---|
1893 | if (s == 0) |
---|
1894 | s = i; |
---|
1895 | else |
---|
1896 | s = -1; |
---|
1897 | } |
---|
1898 | } |
---|
1899 | |
---|
1900 | if (s == 0) Error("G_BKZ_QP: internal error"); |
---|
1901 | |
---|
1902 | if (s > 0) { |
---|
1903 | // special case |
---|
1904 | |
---|
1905 | NumTrivial++; |
---|
1906 | |
---|
1907 | for (i = s; i > jj; i--) { |
---|
1908 | // swap i, i-1 |
---|
1909 | swap(B(i-1), B(i)); |
---|
1910 | if (U) swap((*U)(i-1), (*U)(i)); |
---|
1911 | tp = B1[i-1]; B1[i-1] = B1[i]; B1[i] = tp; |
---|
1912 | } |
---|
1913 | |
---|
1914 | // cerr << "special case\n"; |
---|
1915 | new_m = ll_G_LLL_QP(B, U, delta, 0, check, |
---|
1916 | B1, mu, aux, h, jj, quit, cache); |
---|
1917 | if (new_m != h) Error("G_BKZ_QP: internal error"); |
---|
1918 | if (quit) break; |
---|
1919 | } |
---|
1920 | else { |
---|
1921 | // the general case |
---|
1922 | |
---|
1923 | NumNonTrivial++; |
---|
1924 | |
---|
1925 | |
---|
1926 | for (i = 1; i <= n; i++) conv(B(m+1, i), 0); |
---|
1927 | |
---|
1928 | if (U) { |
---|
1929 | for (i = 1; i <= m_orig; i++) |
---|
1930 | conv((*U)(m+1, i), 0); |
---|
1931 | } |
---|
1932 | |
---|
1933 | for (i = jj; i <= kk; i++) { |
---|
1934 | if (uvec[i] == 0) continue; |
---|
1935 | conv(MU, uvec[i]); |
---|
1936 | RowTransform2(B(m+1), B(i), MU); |
---|
1937 | if (U) RowTransform2((*U)(m+1), (*U)(i), MU); |
---|
1938 | } |
---|
1939 | |
---|
1940 | for (i = m+1; i >= jj+1; i--) { |
---|
1941 | // swap i, i-1 |
---|
1942 | swap(B(i-1), B(i)); |
---|
1943 | if (U) swap((*U)(i-1), (*U)(i)); |
---|
1944 | tp = B1[i-1]; B1[i-1] = B1[i]; B1[i] = tp; |
---|
1945 | } |
---|
1946 | |
---|
1947 | for (i = 1; i <= n; i++) { |
---|
1948 | conv(B1[jj][i], B(jj, i)); |
---|
1949 | CheckFinite(&B1[jj][i]); |
---|
1950 | } |
---|
1951 | |
---|
1952 | if (IsZero(B(jj))) Error("G_BKZ_QP: internal error"); |
---|
1953 | |
---|
1954 | // remove linear dependencies |
---|
1955 | |
---|
1956 | // cerr << "general case\n"; |
---|
1957 | new_m = ll_G_LLL_QP(B, U, delta, 0, 0, B1, mu, aux, |
---|
1958 | kk+1, jj, quit, cache); |
---|
1959 | |
---|
1960 | if (new_m != kk) Error("G_BKZ_QP: internal error"); |
---|
1961 | |
---|
1962 | // remove zero vector |
---|
1963 | |
---|
1964 | for (i = kk+2; i <= m+1; i++) { |
---|
1965 | // swap i, i-1 |
---|
1966 | swap(B(i-1), B(i)); |
---|
1967 | if (U) swap((*U)(i-1), (*U)(i)); |
---|
1968 | tp = B1[i-1]; B1[i-1] = B1[i]; B1[i] = tp; |
---|
1969 | } |
---|
1970 | |
---|
1971 | quit = 0; |
---|
1972 | if (check) { |
---|
1973 | for (i = 1; i <= kk; i++) |
---|
1974 | if ((*check)(B(i))) { |
---|
1975 | quit = 1; |
---|
1976 | break; |
---|
1977 | } |
---|
1978 | } |
---|
1979 | |
---|
1980 | if (quit) break; |
---|
1981 | |
---|
1982 | if (h > kk) { |
---|
1983 | // extend reduced basis |
---|
1984 | |
---|
1985 | new_m = ll_G_LLL_QP(B, U, delta, 0, check, |
---|
1986 | B1, mu, aux, h, h, quit, cache); |
---|
1987 | |
---|
1988 | if (new_m != h) Error("G_BKZ_QP: internal error"); |
---|
1989 | if (quit) break; |
---|
1990 | } |
---|
1991 | } |
---|
1992 | |
---|
1993 | z = 0; |
---|
1994 | } |
---|
1995 | else { |
---|
1996 | // G_LLL_QP |
---|
1997 | // cerr << "progress\n"; |
---|
1998 | |
---|
1999 | NumNoOps++; |
---|
2000 | |
---|
2001 | |
---|
2002 | if (!clean) { |
---|
2003 | new_m = ll_G_LLL_QP(B, U, delta, 0, check, B1, mu, aux, |
---|
2004 | h, h, quit, cache); |
---|
2005 | |
---|
2006 | if (new_m != h) Error("G_BKZ_QP: internal error"); |
---|
2007 | if (quit) break; |
---|
2008 | } |
---|
2009 | |
---|
2010 | z++; |
---|
2011 | } |
---|
2012 | } |
---|
2013 | } |
---|
2014 | |
---|
2015 | |
---|
2016 | if (verb) { |
---|
2017 | G_BKZStatus(GetTime(), enum_time, NumIterations, NumTrivial, NumNonTrivial, |
---|
2018 | NumNoOps, m, B); |
---|
2019 | } |
---|
2020 | |
---|
2021 | |
---|
2022 | // clean up |
---|
2023 | |
---|
2024 | |
---|
2025 | if (m_orig > m) { |
---|
2026 | // for consistency, we move zero vectors to the front |
---|
2027 | |
---|
2028 | for (i = m+1; i <= m_orig; i++) { |
---|
2029 | swap(B(i), B(i+1)); |
---|
2030 | if (U) swap((*U)(i), (*U)(i+1)); |
---|
2031 | } |
---|
2032 | |
---|
2033 | for (i = 0; i < m; i++) { |
---|
2034 | swap(B(m_orig-i), B(m-i)); |
---|
2035 | if (U) swap((*U)(m_orig-i), (*U)(m-i)); |
---|
2036 | } |
---|
2037 | } |
---|
2038 | |
---|
2039 | B.SetDims(m_orig, n); |
---|
2040 | BB = B; |
---|
2041 | |
---|
2042 | if (U) { |
---|
2043 | U->SetDims(m_orig, m_orig); |
---|
2044 | *UU = *U; |
---|
2045 | } |
---|
2046 | |
---|
2047 | for (i = 1; i <= m+1; i++) { |
---|
2048 | delete [] B1[i]; |
---|
2049 | } |
---|
2050 | |
---|
2051 | delete [] B1; |
---|
2052 | |
---|
2053 | for (i = 1; i <= m+1; i++) { |
---|
2054 | delete [] mu[i]; |
---|
2055 | } |
---|
2056 | |
---|
2057 | delete [] mu; |
---|
2058 | |
---|
2059 | for (i = 1; i <= m+1; i++) { |
---|
2060 | delete [] aux[i]; |
---|
2061 | } |
---|
2062 | |
---|
2063 | delete [] aux; |
---|
2064 | |
---|
2065 | |
---|
2066 | delete [] c; |
---|
2067 | delete [] ctilda; |
---|
2068 | delete [] vvec; |
---|
2069 | delete [] yvec; |
---|
2070 | delete [] uvec; |
---|
2071 | delete [] utildavec; |
---|
2072 | delete [] Deltavec; |
---|
2073 | delete [] deltavec; |
---|
2074 | |
---|
2075 | return m; |
---|
2076 | } |
---|
2077 | |
---|
2078 | long G_BKZ_QP1(mat_ZZ& BB, mat_ZZ& UU, double delta, |
---|
2079 | long beta, long prune, LLLCheckFct check, long verb) |
---|
2080 | { |
---|
2081 | verbose = verb; |
---|
2082 | NumSwaps = 0; |
---|
2083 | if (verbose) { |
---|
2084 | StartTime = GetTime(); |
---|
2085 | LastTime = StartTime; |
---|
2086 | } |
---|
2087 | |
---|
2088 | |
---|
2089 | if (delta < 0.50 || delta >= 1) Error("G_BKZ_QP: bad delta"); |
---|
2090 | if (beta < 2) Error("G_BKZ_QP: bad block size"); |
---|
2091 | |
---|
2092 | return G_BKZ_QP1(BB, &UU, to_quad_float(delta), beta, prune, check); |
---|
2093 | } |
---|
2094 | |
---|
2095 | long G_BKZ_QP1(mat_ZZ& BB, double delta, |
---|
2096 | long beta, long prune, LLLCheckFct check, long verb) |
---|
2097 | { |
---|
2098 | verbose = verb; |
---|
2099 | NumSwaps = 0; |
---|
2100 | if (verbose) { |
---|
2101 | StartTime = GetTime(); |
---|
2102 | LastTime = StartTime; |
---|
2103 | } |
---|
2104 | |
---|
2105 | |
---|
2106 | |
---|
2107 | if (delta < 0.50 || delta >= 1) Error("G_BKZ_QP: bad delta"); |
---|
2108 | if (beta < 2) Error("G_BKZ_QP: bad block size"); |
---|
2109 | |
---|
2110 | return G_BKZ_QP1(BB, 0, to_quad_float(delta), beta, prune, check); |
---|
2111 | } |
---|
2112 | |
---|
2113 | NTL_END_IMPL |
---|