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297
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1 /* Micro-C Switch Code generation Part */
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2 /* $Id$ */
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3
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327
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4 #include <stdio.h>
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297
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5 #include "mc.h"
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327
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6 #include "mc-parse.h"
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7 #include "mc-codegen.h"
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297
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8 #include "mc-code.h"
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9
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10 #if CASE_CODE
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11
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299
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12 extern void genswitch(int cslist,int cslabel);
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297
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13
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14 /*
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15 value label pair
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16 cslist = list3(value,next,label) label==0 means skip
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17 continuous cslist
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18 chunks: list4(cslist,next,delta,list3(count,min,max))
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19 mergeable chunks count list
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20 merge: list4(continuous number of chunk,next,delta,case_count);
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21 index list
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22 index: list4(label,next,max,min);
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23 */
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24
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25 #define chunk_max(chunks) caddr(cadddr(chunks))
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26 #define chunk_min(chunks) cadr(cadddr(chunks))
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27 #define index_max(index) caddr(index)
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28 #define index_min(index) cadddr(index)
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298
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29 #define index_label(index) car(index)
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30
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300
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31 #define CASE_TABLE_COUNT 10
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302
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32 #define CASE_INDEX_COUNT CASE_TABLE_COUNT // have to be equal
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298
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33
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361
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34 static int djmp;
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35
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36 static void
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37 check_djmp()
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38 {
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39 if (control && dlabel && djmp)
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40 jmp(dlabel);
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41 djmp = 0;
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42 }
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297
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43
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44 /*
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326
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45 group continuous case value
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297
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46 */
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47
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48 static int
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49 make_chunk(int cslist)
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50 {
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303
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51 register int delta,delta1,list,p,count;
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297
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52 // cslist is already sorted
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53 delta = 0;
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54 list = list4(cslist,0,1,list3(0,car(cslist) /* min */,0));
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55 count=1;
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56 for(p=0;cadr(cslist);cslist = cadr(cslist),count++) {
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57 // compute new delta
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58 delta1 = car(cadr(cslist))-car(cslist);
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59 // empty case
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60 if (!caddr(cslist)) count--;
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61 if (delta==0) {
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62 // 2nd element
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63 caddr(list) = delta = delta1;
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64 if (p) cadr(p)=0; // terminate previous chunk
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65 } else if (delta1!=delta) {
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66 // not contiguous, start new list
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67 caddr(cadddr(list)) = car(cslist); // max
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68 car(cadddr(list)) = count; count=0;
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69 delta = 0;
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70 list = list4(cadr(cslist),list,1,list3(0,0,0));
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71 cadr(cadddr(list)) = car(cadr(cslist)); // min
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72 // prepare terminate point for next turn
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73 p=cslist;
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74 }
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75 }
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76 if (p) cadr(p)=0; // terminate previous chunk
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77 car(cadddr(list)) = count;
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78 caddr(cadddr(list)) = car(cslist); // max
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79 return list;
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80 }
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81
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82 #define CASE_MERGE_RATE 70
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83
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303
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84 static int gcd(int i0,int j0)
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297
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85 {
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303
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86 register int k,i=i0,j=j0;
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297
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87 if (i<j) { k=i; i=j; j=k;}
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88 for(;;) {
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89 if ((k=i%j)==0) return j;
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90 i = j; j = k;
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91 }
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92 }
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93
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94 /*
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95 check two chunks are mergeable or not.
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96 */
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97
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98 static int
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99 merge_chunk_p(int *delta,int max,int min,int *count,int delta1,int count1)
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100 {
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101 int range = max-min;
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102 int g;
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103 // compute possible merge delta
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104 g = gcd(*delta,delta1);
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105 g = gcd(g,range);
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106 range /= g;
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107 *count = count1 = count1+*count;
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108 *delta = g;
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311
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109 #if 0
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297
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110 if (count1*128>(range*128*CASE_MERGE_RATE/100)) {
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111 printf("# min %d, max %d, count %d, delta %d, rate %g t=%d\n",
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112 min,max,count1,g,
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113 ((double)count1)*100.0/range,
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114 count1*128>(range*128*CASE_MERGE_RATE/100)
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115 );
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116 }
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117 #endif
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118 // count/((max-min)/delta) > 0.8
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119 return count1*128>(range*128*CASE_MERGE_RATE/100);
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120 }
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121
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311
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122 static void
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123 free_chunks(chunks)
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124 {
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125 int p;
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126 while(chunks) {
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127 p = car(chunks);
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128 chunks = cadr(chunks); // free_glist3 will destroy cadr
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129 free_glist3(p);
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130 }
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131 }
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297
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132
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133 static int
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134 merge_chunk(int chunks)
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135 {
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303
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136 register int list = chunks;
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137 register int tail,last,max,min,i;
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138 register int c_count,p,widest;
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139 register int merge = 0;
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140 int count,delta=1;
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141
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297
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142 while(cadr(list)) {
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143 p = cadddr(list);
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144 c_count = count = car(p); max=caddr(p);
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145 widest = 1; last = list;
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146 delta = caddr(list);
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147 // check possible merge against the end of the chunks
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148 for(i=1,tail=cadr(list);cadr(tail); tail=cadr(tail),i++) {
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149 p = cadddr(tail);
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150 min = cadr(p);
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151 if (merge_chunk_p(&delta,max,min,&count,caddr(tail),car(p))) {
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152 // It is mergeable.
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153 widest = i+1; last = tail; c_count=count;
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154 }
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155 }
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156 merge = list4(widest,merge,delta,c_count);
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157 // skip merged chunks
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158 list = cadr(last);
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159 }
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160 // last one can remain.
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161 if (list) merge = list4(1,merge,caddr(list),car(cadddr(list)));
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162 return merge;
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163 }
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164
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165 static int
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166 cascade_compare(int count,int cslist)
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167 {
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168 int list;
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169 for(;count-->0;cslist=cadr(cslist)) {
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170 list = car(cslist);
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171 printf("# cascade cases delta=%d count=%d min=%d max=%d\n",
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172 caddr(cslist),car(cadddr(cslist)),
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173 cadr(cadddr(cslist)),caddr(cadddr(cslist))
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174 );
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175 for(;list; list=cadr(list)) {
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176 if (caddr(list))
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177 cmpdimm(car(list),csvalue1,caddr(list),0);
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178 // value register label mode
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179 }
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180 }
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302
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181 // have to be fall thru
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297
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182 return cslist;
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183 }
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184
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300
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185 static int
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186 table_jump(int count,int delta,int chunks)
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187 {
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188 int list,i;
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189 int l,max,min;
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382
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190 if (!code_table_jump_p(delta))
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300
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191 return cascade_compare(count,chunks);
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192
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193 min=cadr(cadddr(chunks));
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194 // find max
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195 for(i=0,list=chunks;i<count;list=cadr(list),i++) {
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196 max=caddr(cadddr(list));
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197 }
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198
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199 printf("# table count %d delta %d max %d min %d\n",
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200 count,delta,max,min);
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201
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202 l = fwdlabel();
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302
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203 code_table_jump(l,csvalue1,delta,max,min,dlabel);
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204 control=0;
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300
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205 code_table_open(l);
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206 i = min;
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207 for(;count-->0;chunks=cadr(chunks)) {
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208 list = car(chunks);
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209 for(;list; list=cadr(list)) {
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210 if (caddr(list)) {
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211 for(;i<car(list);i+=delta) {
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212 code_table_value(dlabel,l);
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213 }
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214 code_table_value(caddr(list),l);
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215 i+=delta;
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216 }
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217 }
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218 }
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219 code_table_close();
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220 return chunks;
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221 }
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222
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297
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223
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224 /*
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225 generate index jmp
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226 */
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227
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228 static void
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229 switch_index_jmp(int index,int label)
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230 {
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298
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231 int value = index_min(index);
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297
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232 cmpdimm(value,csvalue1,label,LT);
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233 // value register label mode
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234 }
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235
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236 /*
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237 generate leaf index branch
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238 */
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239
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240 static int
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298
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241 switch_make_index_leaf(int count,int index,int level)
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297
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242 {
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298
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243 control=1;
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244 printf("# index leaf count=%d level=%d\n",count,level);
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297
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245 for(;count-- !=0 && cadr(index);index=cadr(index)) {
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298
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246 switch_index_jmp( cadr(index), index_label(index) );
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297
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247 }
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248 if (!cadr(index)) {
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249 // don't check max boundary
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298
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250 jmp(index_label(index));
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297
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251 return 0;
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252 }
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298
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253 if (count!= -1) error(-1);
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361
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254 djmp = 1;
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297
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255 return index;
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256 }
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257
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258 /*
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259 generate index switch branch (no table).
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260 if necessary generate higher index.
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261 */
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262
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263 static void
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299
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264 switch_make_index(int index0,int count,int cslabel,int gmax,int level)
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297
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265 {
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266 int index=0;
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267 int icount=0;
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268 int l,min,max;
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298
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269 control=1;
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299
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270 if (count <= CASE_INDEX_COUNT) {
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361
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271 check_djmp();
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297
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272 fwddef(cslabel);
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298
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273 switch_make_index_leaf(-1,index0,level);
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299
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274 } else {
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275 while (index0) {
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361
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276 check_djmp();
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299
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277 l = backdef();
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278 min = index_min(index0);
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279 index0=switch_make_index_leaf(CASE_INDEX_COUNT,index0,level);
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280 if (index0) {
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281 max = index_min(index0)-1;
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282 } else {
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283 max = gmax;
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284 }
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285 index = list4(l,index,max,min);
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286 count-=CASE_INDEX_COUNT;
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287 icount++;
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288 }
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289 switch_make_index(reverse0(index),icount,cslabel,gmax,level+1);
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297
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290 }
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291 }
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292
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293 /*
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294 generate leaf switch branch or table jump
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295 */
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296
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297 static int
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300
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298 switch_leaf(int count,int merge,int chunks)
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297
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299 {
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298
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300 control=1;
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297
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301 for(;count-- !=0 && merge;merge=cadr(merge)) {
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302 printf("# merge count %d delta %d c_count %d\n",
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303 car(merge),caddr(merge),cadddr(merge));
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302
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304 if (cadddr(merge)>CASE_TABLE_COUNT) {
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300
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305 chunks = table_jump(car(merge),caddr(merge),chunks);
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302
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306 } else {
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300
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307 chunks = cascade_compare(car(merge),chunks);
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302
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308 }
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297
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309 }
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302
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310 // table_jump has no fall thru, but cascade_compare does.
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361
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311 if (control) djmp = 1;
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300
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312 return chunks;
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297
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313 }
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314
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315 /*
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316 make index if necessary or
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317 generate case branch or table jump
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318 */
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319
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320 static void
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299
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321 switch_index(int merge,int chunks,int cslabel,int gmax)
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297
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322 {
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323 int m,l,max,min;
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324 int chnkcnt = 0;
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325 int icount = 0;
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326 int count = 0;
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327 int index = 0;
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328 for(m=merge;m;m=cadr(m)) {
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298
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329 if (!index && !cadr(m)) break; // no index for single chunk
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297
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330 chnkcnt++;
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331 count += cadddr(m);
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332 if (count > CASE_INDEX_COUNT || (index && !cadr(m))) {
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333 icount++;
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334 min = car(car(chunks));
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361
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335 check_djmp();
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297
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336 l = backdef();
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337 chunks= switch_leaf(chnkcnt,merge,chunks);
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338 max = chunks?car(car(chunks)):gmax;
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339 index = list4(l,index,max,min);
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340 merge = cadr(m); count = 0; chnkcnt = 0;
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341 }
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342 }
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343 if (index) {
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344 index = reverse0(index);
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345 // check lower bound
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298
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346 // switch_index_jmp(index,dlabel?dlabel:blabel);
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347 // nonsense because no control here.
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299
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348 switch_make_index(index,icount,cslabel,gmax,0);
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297
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349 } else {
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350 fwddef(cslabel);
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351 switch_leaf(-1,merge,chunks);
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352 }
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361
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353 if (control&&dlabel) djmp = 1;
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297
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354 }
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355
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356 /* generate switch table, index, cascading branch */
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357
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358
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359 void
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299
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360 genswitch(int cslist,int cslabel)
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297
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361 {
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362 int chunks,merge,gmax;
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312
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363 #if 0
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311
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364 int i;
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365 int j;
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297
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366 for(i=cslist;i;i=cadr(i)) {
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367 printf("# case %d L_%d\n",car(i),caddr(i));
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368 }
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369 #endif
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311
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370 control=1;
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297
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371 /* find stepwise chunks */
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372 chunks=make_chunk(cslist);
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311
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373 #if 0
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298
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374 j = 0;
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297
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375 for(i=cslist;i;i=cadr(i)) {
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298
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376 j++;
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297
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377 }
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378 #endif
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379 /* possible merge of loose stepwise chunks */
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380 merge = merge_chunk(chunks);
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381 #if 0
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382 // chunks: list3(widest,next,delta);
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383 printf("# chunks %d = sum ",j);
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384 j = 0;
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385 for(i=merge;i;i=cadr(i)) {
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386 printf(" %d/%d",car(i),caddr(i));
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387 j+=car(i);
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388 }
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389 printf(" sum = %d\n",j);
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390 #endif
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391 /* make index branch or table jump */
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392 gmax = chunk_max(chunks);
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393 chunks = reverse0(chunks);
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299
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394 if (!dlabel) dlabel = blabel;
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361
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395 djmp = 0;
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299
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396 switch_index(merge,chunks,cslabel,gmax);
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311
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397 free_chunks(chunks);
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361
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398 if (dlabel!=blabel)
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399 check_djmp();
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297
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400 }
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401
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402 #endif
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403
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404
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405
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406 /* end */
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