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annotate tomsfastmath/src/mul/fp_mul_comba.c @ 643:a362b62d38b2 dropbear-tfm

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Add tomsfastmath from git rev bfa4582842bc3bab42e4be4aed5703437049502a with Makefile.in renamed
author Matt Johnston <matt@ucc.asn.au>
date Wed, 23 Nov 2011 18:10:20 +0700
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children 8622ee48fab5
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a362b62d38b2 Add tomsfastmath from git rev bfa4582842bc3bab42e4be4aed5703437049502a
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1 /* TomsFastMath, a fast ISO C bignum library.
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2 *
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3 * This project is meant to fill in where LibTomMath
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4 * falls short. That is speed ;-)
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5 *
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6 * This project is public domain and free for all purposes.
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7 *
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8 * Tom St Denis, [email protected]
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9 */
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10
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11 /* About this file...
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12
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13 */
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14
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15 #include <tfm.h>
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16
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17 #if defined(TFM_PRESCOTT) && defined(TFM_SSE2)
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18 #undef TFM_SSE2
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19 #define TFM_X86
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20 #endif
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21
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22 /* these are the combas. Worship them. */
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23 #if defined(TFM_X86)
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24 /* Generic x86 optimized code */
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25
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26 /* anything you need at the start */
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27 #define COMBA_START
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28
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29 /* clear the chaining variables */
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30 #define COMBA_CLEAR \
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31 c0 = c1 = c2 = 0;
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32
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33 /* forward the carry to the next digit */
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34 #define COMBA_FORWARD \
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35 do { c0 = c1; c1 = c2; c2 = 0; } while (0);
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36
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37 /* store the first sum */
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38 #define COMBA_STORE(x) \
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39 x = c0;
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40
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41 /* store the second sum [carry] */
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42 #define COMBA_STORE2(x) \
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43 x = c1;
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44
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45 /* anything you need at the end */
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46 #define COMBA_FINI
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47
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48 /* this should multiply i and j */
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49 #define MULADD(i, j) \
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50 asm( \
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51 "movl %6,%%eax \n\t" \
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52 "mull %7 \n\t" \
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53 "addl %%eax,%0 \n\t" \
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54 "adcl %%edx,%1 \n\t" \
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55 "adcl $0,%2 \n\t" \
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56 :"=r"(c0), "=r"(c1), "=r"(c2): "0"(c0), "1"(c1), "2"(c2), "m"(i), "m"(j) :"%eax","%edx","%cc");
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57
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58 #elif defined(TFM_X86_64)
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59 /* x86-64 optimized */
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60
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61 /* anything you need at the start */
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62 #define COMBA_START
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63
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64 /* clear the chaining variables */
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65 #define COMBA_CLEAR \
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66 c0 = c1 = c2 = 0;
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67
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68 /* forward the carry to the next digit */
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69 #define COMBA_FORWARD \
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70 do { c0 = c1; c1 = c2; c2 = 0; } while (0);
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71
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72 /* store the first sum */
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73 #define COMBA_STORE(x) \
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74 x = c0;
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75
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76 /* store the second sum [carry] */
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77 #define COMBA_STORE2(x) \
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78 x = c1;
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79
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80 /* anything you need at the end */
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81 #define COMBA_FINI
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82
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83 /* this should multiply i and j */
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84 #define MULADD(i, j) \
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85 asm ( \
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86 "movq %6,%%rax \n\t" \
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87 "mulq %7 \n\t" \
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88 "addq %%rax,%0 \n\t" \
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89 "adcq %%rdx,%1 \n\t" \
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90 "adcq $0,%2 \n\t" \
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91 :"=r"(c0), "=r"(c1), "=r"(c2): "0"(c0), "1"(c1), "2"(c2), "g"(i), "g"(j) :"%rax","%rdx","%cc");
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92
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93 #elif defined(TFM_SSE2)
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94 /* use SSE2 optimizations */
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95
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96 /* anything you need at the start */
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97 #define COMBA_START
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98
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99 /* clear the chaining variables */
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100 #define COMBA_CLEAR \
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101 c0 = c1 = c2 = 0;
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102
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103 /* forward the carry to the next digit */
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104 #define COMBA_FORWARD \
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105 do { c0 = c1; c1 = c2; c2 = 0; } while (0);
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106
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107 /* store the first sum */
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108 #define COMBA_STORE(x) \
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109 x = c0;
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110
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111 /* store the second sum [carry] */
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112 #define COMBA_STORE2(x) \
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113 x = c1;
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114
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115 /* anything you need at the end */
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116 #define COMBA_FINI \
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117 asm("emms");
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118
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119 /* this should multiply i and j */
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120 #define MULADD(i, j) \
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121 asm( \
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122 "movd %6,%%mm0 \n\t" \
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123 "movd %7,%%mm1 \n\t" \
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124 "pmuludq %%mm1,%%mm0\n\t" \
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125 "movd %%mm0,%%eax \n\t" \
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126 "psrlq $32,%%mm0 \n\t" \
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127 "addl %%eax,%0 \n\t" \
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128 "movd %%mm0,%%eax \n\t" \
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129 "adcl %%eax,%1 \n\t" \
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130 "adcl $0,%2 \n\t" \
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131 :"=r"(c0), "=r"(c1), "=r"(c2): "0"(c0), "1"(c1), "2"(c2), "m"(i), "m"(j) :"%eax","%cc");
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132
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133 #elif defined(TFM_ARM)
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134 /* ARM code */
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135
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136 #define COMBA_START
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137
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138 #define COMBA_CLEAR \
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139 c0 = c1 = c2 = 0;
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140
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141 #define COMBA_FORWARD \
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142 do { c0 = c1; c1 = c2; c2 = 0; } while (0);
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143
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144 #define COMBA_STORE(x) \
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145 x = c0;
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146
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147 #define COMBA_STORE2(x) \
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148 x = c1;
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149
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150 #define COMBA_FINI
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151
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152 #define MULADD(i, j) \
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153 asm( \
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154 " UMULL r0,r1,%6,%7 \n\t" \
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155 " ADDS %0,%0,r0 \n\t" \
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156 " ADCS %1,%1,r1 \n\t" \
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157 " ADC %2,%2,#0 \n\t" \
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158 :"=r"(c0), "=r"(c1), "=r"(c2) : "0"(c0), "1"(c1), "2"(c2), "r"(i), "r"(j) : "r0", "r1", "%cc");
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159
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160 #elif defined(TFM_PPC32)
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161 /* For 32-bit PPC */
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162
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163 #define COMBA_START
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164
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165 #define COMBA_CLEAR \
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166 c0 = c1 = c2 = 0;
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167
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168 #define COMBA_FORWARD \
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169 do { c0 = c1; c1 = c2; c2 = 0; } while (0);
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170
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171 #define COMBA_STORE(x) \
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172 x = c0;
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173
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174 #define COMBA_STORE2(x) \
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175 x = c1;
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176
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177 #define COMBA_FINI
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178
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179 /* untested: will mulhwu change the flags? Docs say no */
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180 #define MULADD(i, j) \
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181 asm( \
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182 " mullw 16,%6,%7 \n\t" \
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183 " addc %0,%0,16 \n\t" \
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184 " mulhwu 16,%6,%7 \n\t" \
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185 " adde %1,%1,16 \n\t" \
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186 " addze %2,%2 \n\t" \
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187 :"=r"(c0), "=r"(c1), "=r"(c2):"0"(c0), "1"(c1), "2"(c2), "r"(i), "r"(j):"16");
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188
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189 #elif defined(TFM_PPC64)
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190 /* For 64-bit PPC */
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191
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192 #define COMBA_START
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193
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194 #define COMBA_CLEAR \
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195 c0 = c1 = c2 = 0;
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196
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197 #define COMBA_FORWARD \
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198 do { c0 = c1; c1 = c2; c2 = 0; } while (0);
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199
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200 #define COMBA_STORE(x) \
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201 x = c0;
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202
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203 #define COMBA_STORE2(x) \
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204 x = c1;
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205
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206 #define COMBA_FINI
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diff changeset
207
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208 /* untested: will mulhdu change the flags? Docs say no */
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diff changeset
209 #define MULADD(i, j) \
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diff changeset
210 asm( \
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211 " mulld r16,%6,%7 \n\t" \
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diff changeset
212 " addc %0,%0,16 \n\t" \
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diff changeset
213 " mulhdu r16,%6,%7 \n\t" \
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diff changeset
214 " adde %1,%1,16 \n\t" \
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diff changeset
215 " addze %2,%2 \n\t" \
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216 :"=r"(c0), "=r"(c1), "=r"(c2):"0"(c0), "1"(c1), "2"(c2), "r"(i), "r"(j):"r16");
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217
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218 #elif defined(TFM_AVR32)
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219
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220 /* ISO C code */
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221
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222 #define COMBA_START
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223
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224 #define COMBA_CLEAR \
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225 c0 = c1 = c2 = 0;
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226
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227 #define COMBA_FORWARD \
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228 do { c0 = c1; c1 = c2; c2 = 0; } while (0);
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229
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230 #define COMBA_STORE(x) \
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231 x = c0;
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232
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233 #define COMBA_STORE2(x) \
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234 x = c1;
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235
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236 #define COMBA_FINI
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237
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238 #define MULADD(i, j) \
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239 asm( \
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240 " mulu.d r2,%6,%7 \n\t"\
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241 " add %0,r2 \n\t"\
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242 " adc %1,%1,r3 \n\t"\
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243 " acr %2 \n\t"\
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244 :"=r"(c0), "=r"(c1), "=r"(c2):"0"(c0), "1"(c1), "2"(c2), "r"(i), "r"(j):"r2","r3");
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245
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246 #elif defined(TFM_MIPS)
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247
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248 #define COMBA_START
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249
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250 #define COMBA_CLEAR \
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251 c0 = c1 = c2 = 0;
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252
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253 #define COMBA_FORWARD \
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254 do { c0 = c1; c1 = c2; c2 = 0; } while (0);
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255
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256 #define COMBA_STORE(x) \
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257 x = c0;
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258
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259 #define COMBA_STORE2(x) \
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260 x = c1;
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261
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262 #define COMBA_FINI
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263
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264 #define MULADD(i, j) \
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265 asm( \
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266 " multu %6,%7 \n\t" \
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267 " mflo $12 \n\t" \
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268 " mfhi $13 \n\t" \
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269 " addu %0,%0,$12 \n\t" \
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270 " sltu $12,%0,$12 \n\t" \
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271 " addu %1,%1,$13 \n\t" \
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272 " sltu $13,%1,$13 \n\t" \
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273 " addu %1,%1,$12 \n\t" \
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274 " sltu $12,%1,$12 \n\t" \
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275 " addu %2,%2,$13 \n\t" \
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276 " addu %2,%2,$12 \n\t" \
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277 :"=r"(c0), "=r"(c1), "=r"(c2):"0"(c0), "1"(c1), "2"(c2), "r"(i), "r"(j):"$12","$13");
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278
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279 #else
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280 /* ISO C code */
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281
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282 #define COMBA_START
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283
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284 #define COMBA_CLEAR \
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285 c0 = c1 = c2 = 0;
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286
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287 #define COMBA_FORWARD \
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288 do { c0 = c1; c1 = c2; c2 = 0; } while (0);
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289
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290 #define COMBA_STORE(x) \
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291 x = c0;
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292
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293 #define COMBA_STORE2(x) \
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294 x = c1;
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295
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296 #define COMBA_FINI
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297
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298 #define MULADD(i, j) \
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299 do { fp_word t; \
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300 t = (fp_word)c0 + ((fp_word)i) * ((fp_word)j); c0 = t; \
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301 t = (fp_word)c1 + (t >> DIGIT_BIT); c1 = t; c2 += t >> DIGIT_BIT; \
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302 } while (0);
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303
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304 #endif
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305
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306 #ifndef TFM_DEFINES
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307
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308 /* generic PxQ multiplier */
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309 void fp_mul_comba(fp_int *A, fp_int *B, fp_int *C)
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310 {
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311 int ix, iy, iz, tx, ty, pa;
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312 fp_digit c0, c1, c2, *tmpx, *tmpy;
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313 fp_int tmp, *dst;
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314
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315 COMBA_START;
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316 COMBA_CLEAR;
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317
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318 /* get size of output and trim */
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319 pa = A->used + B->used;
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320 if (pa >= FP_SIZE) {
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321 pa = FP_SIZE-1;
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322 }
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323
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324 if (A == C || B == C) {
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325 fp_zero(&tmp);
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326 dst = &tmp;
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327 } else {
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328 fp_zero(C);
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329 dst = C;
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330 }
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331
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332 for (ix = 0; ix < pa; ix++) {
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333 /* get offsets into the two bignums */
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334 ty = MIN(ix, B->used-1);
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335 tx = ix - ty;
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336
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337 /* setup temp aliases */
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338 tmpx = A->dp + tx;
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339 tmpy = B->dp + ty;
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340
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341 /* this is the number of times the loop will iterrate, essentially its
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342 while (tx++ < a->used && ty-- >= 0) { ... }
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343 */
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344 iy = MIN(A->used-tx, ty+1);
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345
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346 /* execute loop */
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347 COMBA_FORWARD;
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348 for (iz = 0; iz < iy; ++iz) {
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349 MULADD(*tmpx++, *tmpy--);
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350 }
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351
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352 /* store term */
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353 COMBA_STORE(dst->dp[ix]);
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354 }
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355 COMBA_FINI;
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356
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357 dst->used = pa;
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358 dst->sign = A->sign ^ B->sign;
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359 fp_clamp(dst);
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360 fp_copy(dst, C);
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361 }
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362
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363 #endif
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364
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365 /* $Source$ */
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366 /* $Revision$ */
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367 /* $Date$ */
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368