FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/basicops.c @ 366:1588a7d9e732
libtwamr: integrate g_code.c
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 06 May 2024 03:04:57 +0000 |
parents | 1c514150c033 |
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rev | line source |
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1 /* |
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2 * This C module is a stripped-down version made from ETSI basicop2.c, |
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3 * reduced to just those functions which we are not inlining. |
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4 */ |
38
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5 |
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6 /*___________________________________________________________________________ |
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7 | | |
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8 | Include-Files | |
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9 |___________________________________________________________________________| |
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10 */ |
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11 |
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12 #include <stdint.h> |
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13 #include "typedef.h" |
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14 #include "namespace.h" |
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15 #include "basic_op.h" |
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16 |
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17 /*___________________________________________________________________________ |
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18 | | |
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19 | Functions | |
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20 |___________________________________________________________________________| |
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21 */ |
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22 |
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23 /*___________________________________________________________________________ |
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24 | | |
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25 | Function Name : L_macNs | |
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26 | | |
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27 | Purpose : | |
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28 | | |
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29 | Multiply var1 by var2 and shift the result left by 1. Add the 32 bit | |
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30 | result to L_var3 without saturation, return a 32 bit result. Generate | |
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31 | carry and overflow values : | |
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32 | L_macNs(L_var3,var1,var2) = L_add_c(L_var3,L_mult(var1,var2)). | |
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33 | | |
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34 | Complexity weight : 1 | |
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35 | | |
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36 | Inputs : | |
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37 | | |
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38 | L_var3 32 bit long signed integer (Word32) whose value falls in the | |
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39 | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
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40 | | |
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41 | var1 | |
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42 | 16 bit short signed integer (Word16) whose value falls in the | |
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43 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
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44 | | |
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45 | var2 | |
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46 | 16 bit short signed integer (Word16) whose value falls in the | |
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47 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
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48 | | |
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49 | Outputs : | |
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50 | | |
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51 | none | |
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52 | | |
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53 | Return Value : | |
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54 | | |
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55 | L_var_out | |
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56 | 32 bit long signed integer (Word32) whose value falls in the | |
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57 | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
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58 | | |
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59 | Caution : | |
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60 | | |
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61 | In some cases the Carry flag has to be cleared or set before using | |
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62 | operators which take into account its value. | |
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63 |___________________________________________________________________________| |
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64 */ |
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65 |
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66 Word32 L_macNs (Word32 L_var3, Word16 var1, Word16 var2) |
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67 { |
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68 Word32 L_var_out; |
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69 |
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70 L_var_out = L_mult (var1, var2); |
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71 L_var_out = L_add_c (L_var3, L_var_out); |
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72 return (L_var_out); |
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73 } |
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74 |
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75 /*___________________________________________________________________________ |
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76 | | |
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77 | Function Name : L_msuNs | |
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78 | | |
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79 | Purpose : | |
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80 | | |
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81 | Multiply var1 by var2 and shift the result left by 1. Subtract the 32 | |
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82 | bit result from L_var3 without saturation, return a 32 bit result. Ge- | |
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83 | nerate carry and overflow values : | |
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84 | L_msuNs(L_var3,var1,var2) = L_sub_c(L_var3,L_mult(var1,var2)). | |
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85 | | |
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86 | Complexity weight : 1 | |
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87 | | |
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88 | Inputs : | |
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89 | | |
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90 | L_var3 32 bit long signed integer (Word32) whose value falls in the | |
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91 | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
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92 | | |
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93 | var1 | |
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94 | 16 bit short signed integer (Word16) whose value falls in the | |
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95 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
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96 | | |
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97 | var2 | |
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98 | 16 bit short signed integer (Word16) whose value falls in the | |
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99 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
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100 | | |
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101 | Outputs : | |
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102 | | |
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103 | none | |
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104 | | |
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105 | Return Value : | |
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106 | | |
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107 | L_var_out | |
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108 | 32 bit long signed integer (Word32) whose value falls in the | |
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109 | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
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110 | | |
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111 | Caution : | |
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112 | | |
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113 | In some cases the Carry flag has to be cleared or set before using | |
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114 | operators which take into account its value. | |
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115 |___________________________________________________________________________| |
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116 */ |
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117 |
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118 Word32 L_msuNs (Word32 L_var3, Word16 var1, Word16 var2) |
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119 { |
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120 Word32 L_var_out; |
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121 |
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122 L_var_out = L_mult (var1, var2); |
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123 L_var_out = L_sub_c (L_var3, L_var_out); |
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124 return (L_var_out); |
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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 | Function Name : L_add_c | |
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130 | | |
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131 | Purpose : | |
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132 | | |
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133 | Performs 32 bits addition of the two 32 bits variables (L_var1+L_var2+C)| |
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134 | with carry. No saturation. Generate carry and Overflow values. The car- | |
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135 | ry and overflow values are binary variables which can be tested and as- | |
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136 | signed values. | |
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137 | | |
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138 | Complexity weight : 2 | |
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139 | | |
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140 | Inputs : | |
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141 | | |
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142 | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
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143 | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
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144 | | |
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145 | L_var2 32 bit long signed integer (Word32) whose value falls in the | |
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146 | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
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147 | | |
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148 | Outputs : | |
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149 | | |
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150 | none | |
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151 | | |
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152 | Return Value : | |
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153 | | |
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154 | L_var_out | |
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155 | 32 bit long signed integer (Word32) whose value falls in the | |
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156 | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
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157 | | |
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158 | Caution : | |
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159 | | |
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160 | In some cases the Carry flag has to be cleared or set before using | |
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161 | operators which take into account its value. | |
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162 |___________________________________________________________________________| |
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163 */ |
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164 Word32 L_add_c (Word32 L_var1, Word32 L_var2) |
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165 { |
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166 Word32 L_var_out; |
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167 Word32 L_test; |
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168 Flag carry_int = 0; |
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169 |
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170 L_var_out = L_var1 + L_var2 + Carry; |
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171 |
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172 L_test = L_var1 + L_var2; |
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173 |
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174 if ((L_var1 > 0) && (L_var2 > 0) && (L_test < 0)) |
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175 { |
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176 Overflow = 1; |
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177 carry_int = 0; |
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178 } |
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179 else |
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180 { |
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181 if ((L_var1 < 0) && (L_var2 < 0)) |
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182 { |
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183 if (L_test >= 0) |
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184 { |
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185 Overflow = 1; |
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186 carry_int = 1; |
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187 } |
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188 else |
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189 { |
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190 Overflow = 0; |
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191 carry_int = 1; |
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192 } |
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193 } |
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194 else |
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195 { |
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196 if (((L_var1 ^ L_var2) < 0) && (L_test >= 0)) |
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197 { |
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198 Overflow = 0; |
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199 carry_int = 1; |
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200 } |
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201 else |
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202 { |
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203 Overflow = 0; |
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204 carry_int = 0; |
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205 } |
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206 } |
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207 } |
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208 |
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209 if (Carry) |
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210 { |
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211 if (L_test == MAX_32) |
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212 { |
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213 Overflow = 1; |
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214 Carry = carry_int; |
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215 } |
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216 else |
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217 { |
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218 if (L_test == (Word32) 0xFFFFFFFFL) |
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219 { |
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220 Carry = 1; |
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221 } |
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222 else |
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223 { |
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224 Carry = carry_int; |
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225 } |
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226 } |
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227 } |
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228 else |
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229 { |
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230 Carry = carry_int; |
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231 } |
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232 |
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233 return (L_var_out); |
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234 } |
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235 |
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236 /*___________________________________________________________________________ |
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237 | | |
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238 | Function Name : L_sub_c | |
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239 | | |
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240 | Purpose : | |
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241 | | |
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242 | Performs 32 bits subtraction of the two 32 bits variables with carry | |
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243 | (borrow) : L_var1-L_var2-C. No saturation. Generate carry and Overflow | |
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244 | values. The carry and overflow values are binary variables which can | |
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245 | be tested and assigned values. | |
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246 | | |
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247 | Complexity weight : 2 | |
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248 | | |
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249 | Inputs : | |
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250 | | |
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251 | L_var1 32 bit long signed integer (Word32) whose value falls in the | |
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252 | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
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253 | | |
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254 | L_var2 32 bit long signed integer (Word32) whose value falls in the | |
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255 | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
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256 | | |
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257 | Outputs : | |
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258 | | |
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259 | none | |
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260 | | |
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261 | Return Value : | |
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262 | | |
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263 | L_var_out | |
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264 | 32 bit long signed integer (Word32) whose value falls in the | |
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265 | range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. | |
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266 | | |
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267 | Caution : | |
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268 | | |
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269 | In some cases the Carry flag has to be cleared or set before using | |
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270 | operators which take into account its value. | |
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271 |___________________________________________________________________________| |
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272 */ |
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273 |
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274 Word32 L_sub_c (Word32 L_var1, Word32 L_var2) |
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275 { |
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276 Word32 L_var_out; |
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277 Word32 L_test; |
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278 Flag carry_int = 0; |
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279 |
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280 if (Carry) |
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281 { |
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282 Carry = 0; |
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283 if (L_var2 != MIN_32) |
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284 { |
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285 L_var_out = L_add_c (L_var1, -L_var2); |
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286 } |
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287 else |
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288 { |
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289 L_var_out = L_var1 - L_var2; |
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290 if (L_var1 > 0L) |
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291 { |
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292 Overflow = 1; |
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293 Carry = 0; |
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294 } |
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295 } |
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296 } |
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297 else |
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298 { |
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299 L_var_out = L_var1 - L_var2 - (Word32) 0X00000001L; |
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300 L_test = L_var1 - L_var2; |
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301 |
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302 if ((L_test < 0) && (L_var1 > 0) && (L_var2 < 0)) |
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303 { |
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304 Overflow = 1; |
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305 carry_int = 0; |
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306 } |
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307 else if ((L_test > 0) && (L_var1 < 0) && (L_var2 > 0)) |
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308 { |
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309 Overflow = 1; |
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310 carry_int = 1; |
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311 } |
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312 else if ((L_test > 0) && ((L_var1 ^ L_var2) > 0)) |
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313 { |
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314 Overflow = 0; |
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315 carry_int = 1; |
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316 } |
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317 if (L_test == MIN_32) |
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318 { |
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319 Overflow = 1; |
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320 Carry = carry_int; |
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321 } |
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322 else |
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323 { |
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324 Carry = carry_int; |
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325 } |
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326 } |
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327 |
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328 return (L_var_out); |
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329 } |
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330 |
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331 /*___________________________________________________________________________ |
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332 | | |
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333 | Function Name : shr_r | |
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334 | | |
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335 | Purpose : | |
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336 | | |
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337 | Same as shr(var1,var2) but with rounding. Saturate the result in case of| |
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338 | underflows or overflows : | |
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339 | - If var2 is greater than zero : | |
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340 | if (sub(shl(shr(var1,var2),1),shr(var1,sub(var2,1)))) | |
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341 | is equal to zero | |
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342 | then | |
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343 | shr_r(var1,var2) = shr(var1,var2) | |
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344 | else | |
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345 | shr_r(var1,var2) = add(shr(var1,var2),1) | |
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346 | - If var2 is less than or equal to zero : | |
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347 | shr_r(var1,var2) = shr(var1,var2). | |
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348 | | |
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349 | Complexity weight : 2 | |
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350 | | |
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351 | Inputs : | |
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352 | | |
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353 | var1 | |
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354 | 16 bit short signed integer (Word16) whose value falls in the | |
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355 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
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356 | | |
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357 | var2 | |
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358 | 16 bit short signed integer (Word16) whose value falls in the | |
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359 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
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360 | | |
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361 | Outputs : | |
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362 | | |
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363 | none | |
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364 | | |
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365 | Return Value : | |
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366 | | |
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367 | var_out | |
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368 | 16 bit short signed integer (Word16) whose value falls in the | |
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369 | range : 0xffff 8000 <= var_out <= 0x0000 7fff. | |
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370 |___________________________________________________________________________| |
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371 */ |
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372 |
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373 Word16 shr_r (Word16 var1, Word16 var2) |
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374 { |
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375 Word16 var_out; |
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376 |
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377 if (var2 > 15) |
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378 { |
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379 var_out = 0; |
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380 } |
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381 else |
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382 { |
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383 var_out = shr (var1, var2); |
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384 |
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385 if (var2 > 0) |
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386 { |
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387 if ((var1 & ((Word16) 1 << (var2 - 1))) != 0) |
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|
388 { |
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389 var_out++; |
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390 } |
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391 } |
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392 } |
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|
393 return (var_out); |
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394 } |
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395 |
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|
396 /*___________________________________________________________________________ |
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397 | | |
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|
398 | Function Name : mac_r | |
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399 | | |
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400 | Purpose : | |
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|
401 | | |
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|
402 | Multiply var1 by var2 and shift the result left by 1. Add the 32 bit | |
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|
403 | result to L_var3 with saturation. Round the LS 16 bits of the result | |
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|
404 | into the MS 16 bits with saturation and shift the result right by 16. | |
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405 | Return a 16 bit result. | |
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|
406 | mac_r(L_var3,var1,var2) = round(L_mac(L_var3,var1,var2)) | |
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|
407 | | |
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parents:
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|
408 | Complexity weight : 2 | |
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|
409 | | |
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|
410 | Inputs : | |
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|
411 | | |
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|
412 | L_var3 32 bit long signed integer (Word32) whose value falls in the | |
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parents:
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|
413 | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
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|
414 | | |
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|
415 | var1 | |
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|
416 | 16 bit short signed integer (Word16) whose value falls in the | |
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|
417 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
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parents:
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|
418 | | |
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|
419 | var2 | |
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|
420 | 16 bit short signed integer (Word16) whose value falls in the | |
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|
421 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
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parents:
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|
422 | | |
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|
423 | Outputs : | |
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|
424 | | |
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|
425 | none | |
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|
426 | | |
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|
427 | Return Value : | |
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parents:
diff
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|
428 | | |
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Mychaela Falconia <falcon@freecalypso.org>
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|
429 | var_out | |
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parents:
diff
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|
430 | 16 bit short signed integer (Word16) whose value falls in the | |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
431 | range : 0x0000 8000 <= L_var_out <= 0x0000 7fff. | |
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|
432 |___________________________________________________________________________| |
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|
433 */ |
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|
434 |
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|
435 Word16 mac_r (Word32 L_var3, Word16 var1, Word16 var2) |
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|
436 { |
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parents:
diff
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|
437 Word16 var_out; |
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parents:
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|
438 |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
439 L_var3 = L_mac (L_var3, var1, var2); |
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parents:
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|
440 L_var3 = L_add (L_var3, (Word32) 0x00008000L); |
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|
441 var_out = extract_h (L_var3); |
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parents:
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|
442 return (var_out); |
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|
443 } |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
444 |
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Mychaela Falconia <falcon@freecalypso.org>
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diff
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|
445 /*___________________________________________________________________________ |
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Mychaela Falconia <falcon@freecalypso.org>
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diff
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|
446 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
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|
447 | Function Name : msu_r | |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
448 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
449 | Purpose : | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
450 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
451 | Multiply var1 by var2 and shift the result left by 1. Subtract the 32 | |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
452 | bit result to L_var3 with saturation. Round the LS 16 bits of the res- | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
453 | ult into the MS 16 bits with saturation and shift the result right by | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
454 | 16. Return a 16 bit result. | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
455 | msu_r(L_var3,var1,var2) = round(L_msu(L_var3,var1,var2)) | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
456 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
457 | Complexity weight : 2 | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
458 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
459 | Inputs : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
460 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
461 | L_var3 32 bit long signed integer (Word32) whose value falls in the | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
462 | range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
463 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
464 | var1 | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
465 | 16 bit short signed integer (Word16) whose value falls in the | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
466 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
467 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
468 | var2 | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
469 | 16 bit short signed integer (Word16) whose value falls in the | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
470 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
471 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
472 | Outputs : | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
473 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
474 | none | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
475 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
476 | Return Value : | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
477 | | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
478 | var_out | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
479 | 16 bit short signed integer (Word16) whose value falls in the | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
480 | range : 0x0000 8000 <= L_var_out <= 0x0000 7fff. | |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
481 |___________________________________________________________________________| |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
482 */ |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
483 |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
484 Word16 msu_r (Word32 L_var3, Word16 var1, Word16 var2) |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
485 { |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
486 Word16 var_out; |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
487 |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
488 L_var3 = L_msu (L_var3, var1, var2); |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
489 L_var3 = L_add (L_var3, (Word32) 0x00008000L); |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
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|
490 var_out = extract_h (L_var3); |
38326102fc43
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
491 return (var_out); |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
492 } |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
493 |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
494 /*___________________________________________________________________________ |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
495 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
496 | Function Name : L_shr_r | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
497 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
498 | Purpose : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
499 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
500 | Same as L_shr(L_var1,var2) but with rounding. Saturate the result in | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
501 | case of underflows or overflows : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
502 | - If var2 is greater than zero : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
503 | if (L_sub(L_shl(L_shr(L_var1,var2),1),L_shr(L_var1,sub(var2,1))))| |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
504 | is equal to zero | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
505 | then | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
506 | L_shr_r(L_var1,var2) = L_shr(L_var1,var2) | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
507 | else | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
508 | L_shr_r(L_var1,var2) = L_add(L_shr(L_var1,var2),1) | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
509 | - If var2 is less than or equal to zero : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
510 | L_shr_r(L_var1,var2) = L_shr(L_var1,var2). | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
511 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
512 | Complexity weight : 3 | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
513 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
514 | Inputs : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
515 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
516 | L_var1 | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
517 | 32 bit long signed integer (Word32) whose value falls in the | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
518 | range : 0x8000 0000 <= var1 <= 0x7fff ffff. | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
519 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
520 | var2 | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
521 | 16 bit short signed integer (Word16) whose value falls in the | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
522 | range : 0xffff 8000 <= var1 <= 0x0000 7fff. | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
523 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
524 | Outputs : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
525 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
526 | none | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
527 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
528 | Return Value : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
529 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
530 | L_var_out | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
531 | 32 bit long signed integer (Word32) whose value falls in the | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
532 | range : 0x8000 0000 <= var_out <= 0x7fff ffff. | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
533 |___________________________________________________________________________| |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
534 */ |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
535 |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
536 Word32 L_shr_r (Word32 L_var1, Word16 var2) |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
537 { |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
538 Word32 L_var_out; |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
539 |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
540 if (var2 > 31) |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
541 { |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
542 L_var_out = 0; |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
543 } |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
544 else |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
545 { |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
546 L_var_out = L_shr (L_var1, var2); |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
547 if (var2 > 0) |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
548 { |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
549 if ((L_var1 & ((Word32) 1 << (var2 - 1))) != 0) |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
550 { |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
551 L_var_out++; |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
552 } |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
553 } |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
554 } |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
555 return (L_var_out); |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
556 } |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
557 |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
558 /*___________________________________________________________________________ |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
559 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
560 | Function Name : L_sat | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
561 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
562 | Purpose : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
563 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
564 | 32 bit L_var1 is set to 2147483647 if an overflow occured or to | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
565 | -2147483648 if an underflow occured on the most recent L_add_c, | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
566 | L_sub_c, L_macNs or L_msuNs operations. The carry and overflow values | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
567 | are binary values which can be tested and assigned values. | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
568 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
569 | Complexity weight : 4 | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
570 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
571 | Inputs : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
572 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
573 | L_var1 | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
574 | 32 bit long signed integer (Word32) whose value falls in the | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
575 | range : 0x8000 0000 <= var1 <= 0x7fff ffff. | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
576 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
577 | Outputs : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
578 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
579 | none | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
580 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
581 | Return Value : | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
582 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
583 | L_var_out | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
584 | 32 bit long signed integer (Word32) whose value falls in the | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
585 | range : 0x8000 0000 <= var_out <= 0x7fff ffff. | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
586 |___________________________________________________________________________| |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
587 */ |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
588 |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
589 Word32 L_sat (Word32 L_var1) |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
590 { |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
591 Word32 L_var_out; |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
592 |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
593 L_var_out = L_var1; |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
594 |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
595 if (Overflow) |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
596 { |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
597 if (Carry) |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
598 { |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
599 L_var_out = MIN_32; |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
600 } |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
601 else |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
602 { |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
603 L_var_out = MAX_32; |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
604 } |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
605 |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
606 Carry = 0; |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
607 Overflow = 0; |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
608 } |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
609 return (L_var_out); |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
610 } |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
611 |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
612 /*___________________________________________________________________________ |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
613 | | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
614 | Function Name : div_s | |
38326102fc43
libgsmefr: beginning to integrate code from ETSI
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
615 | | |
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616 | Purpose : | |
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617 | | |
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618 | Produces a result which is the fractional integer division of var1 by | |
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619 | var2; var1 and var2 must be positive and var2 must be greater or equal | |
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620 | to var1; the result is positive (leading bit equal to 0) and truncated | |
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621 | to 16 bits. | |
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622 | If var1 = var2 then div(var1,var2) = 32767. | |
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623 | | |
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624 | Complexity weight : 18 | |
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625 | | |
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626 | Inputs : | |
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627 | | |
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628 | var1 | |
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629 | 16 bit short signed integer (Word16) whose value falls in the | |
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630 | range : 0x0000 0000 <= var1 <= var2 and var2 != 0. | |
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631 | | |
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632 | var2 | |
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633 | 16 bit short signed integer (Word16) whose value falls in the | |
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634 | range : var1 <= var2 <= 0x0000 7fff and var2 != 0. | |
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635 | | |
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636 | Outputs : | |
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637 | | |
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638 | none | |
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639 | | |
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640 | Return Value : | |
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641 | | |
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642 | var_out | |
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643 | 16 bit short signed integer (Word16) whose value falls in the | |
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644 | range : 0x0000 0000 <= var_out <= 0x0000 7fff. | |
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645 | It's a Q15 value (point between b15 and b14). | |
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646 |___________________________________________________________________________| |
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647 */ |
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648 |
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649 Word16 div_s (Word16 var1, Word16 var2) |
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650 { |
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651 Word16 var_out = 0; |
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652 Word16 iteration; |
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653 Word32 L_num; |
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654 Word32 L_denom; |
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655 |
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656 #if 0 |
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657 if ((var1 > var2) || (var1 < 0) || (var2 < 0)) |
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658 { |
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659 printf ("Division Error var1=%d var2=%d\n", var1, var2); |
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660 exit (0); |
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661 } |
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662 if (var2 == 0) |
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663 { |
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664 printf ("Division by 0, Fatal error \n"); |
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665 exit (0); |
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666 } |
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|
667 #endif |
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668 |
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669 if (var1 == 0) |
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670 { |
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671 var_out = 0; |
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672 } |
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673 else |
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674 { |
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675 if (var1 == var2) |
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676 { |
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677 var_out = MAX_16; |
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678 } |
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|
679 else |
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|
680 { |
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parents:
diff
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|
681 L_num = L_deposit_l (var1); |
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682 L_denom = L_deposit_l (var2); |
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|
683 |
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684 for (iteration = 0; iteration < 15; iteration++) |
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diff
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|
685 { |
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|
686 var_out <<= 1; |
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687 L_num <<= 1; |
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|
688 |
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diff
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|
689 if (L_num >= L_denom) |
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|
690 { |
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|
691 L_num = L_sub (L_num, L_denom); |
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|
692 var_out = add (var_out, 1); |
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|
693 } |
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|
694 } |
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|
695 } |
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|
696 } |
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|
697 |
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698 return (var_out); |
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699 } |