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1 /* libgcc functions for Blackfin.
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2 Copyright (C) 2005, 2009 Free Software Foundation, Inc.
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3 Contributed by Analog Devices.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #ifdef L_divsi3
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27 .text
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28 .align 2
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29 .global ___divsi3;
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30 .type ___divsi3, STT_FUNC;
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31
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32 ___divsi3:
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33 [--SP]= RETS;
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34 [--SP] = R7;
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35
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36 R2 = -R0;
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37 CC = R0 < 0;
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38 IF CC R0 = R2;
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39 R7 = CC;
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40
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41 R2 = -R1;
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42 CC = R1 < 0;
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43 IF CC R1 = R2;
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44 R2 = CC;
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45 R7 = R7 ^ R2;
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46
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47 CALL ___udivsi3;
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48
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49 CC = R7;
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50 R1 = -R0;
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51 IF CC R0 = R1;
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52
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53 R7 = [SP++];
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54 RETS = [SP++];
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55 RTS;
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56 #endif
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57
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58 #ifdef L_modsi3
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59 .align 2
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60 .global ___modsi3;
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61 .type ___modsi3, STT_FUNC;
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62
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63 ___modsi3:
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64 [--SP] = RETS;
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65 [--SP] = R0;
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66 [--SP] = R1;
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67 CALL ___divsi3;
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68 R2 = [SP++];
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69 R1 = [SP++];
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70 R2 *= R0;
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71 R0 = R1 - R2;
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72 RETS = [SP++];
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73 RTS;
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74 #endif
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75
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76 #ifdef L_udivsi3
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77 .align 2
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78 .global ___udivsi3;
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79 .type ___udivsi3, STT_FUNC;
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80
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81 ___udivsi3:
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82 P0 = 32;
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83 LSETUP (0f, 1f) LC0 = P0;
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84 /* upper half of dividend */
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85 R3 = 0;
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86 0:
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87 /* The first time round in the loop we shift in garbage, but since we
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88 perform 33 shifts, it doesn't matter. */
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89 R0 = ROT R0 BY 1;
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90 R3 = ROT R3 BY 1;
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91 R2 = R3 - R1;
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92 CC = R3 < R1 (IU);
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93 1:
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94 /* Last instruction of the loop. */
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95 IF ! CC R3 = R2;
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96
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97 /* Shift in the last bit. */
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98 R0 = ROT R0 BY 1;
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99 /* R0 is the result, R3 contains the remainder. */
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100 R0 = ~ R0;
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101 RTS;
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102 #endif
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103
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104 #ifdef L_umodsi3
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105 .align 2
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106 .global ___umodsi3;
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107 .type ___umodsi3, STT_FUNC;
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108
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109 ___umodsi3:
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110 [--SP] = RETS;
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111 CALL ___udivsi3;
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112 R0 = R3;
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113 RETS = [SP++];
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114 RTS;
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115 #endif
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116
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117 #ifdef L_umulsi3_highpart
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118 .align 2
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119 .global ___umulsi3_highpart;
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120 .type ___umulsi3_highpart, STT_FUNC;
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121
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122 ___umulsi3_highpart:
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123 A1 = R1.L * R0.L (FU);
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124 A1 = A1 >> 16;
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125 A0 = R1.H * R0.H, A1 += R1.L * R0.H (FU);
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126 A1 += R0.L * R1.H (FU);
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127 A1 = A1 >> 16;
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128 A0 += A1;
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129 R0 = A0 (FU);
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130 RTS;
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131 #endif
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132
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133 #ifdef L_smulsi3_highpart
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134 .align 2
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135 .global ___smulsi3_highpart;
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136 .type ___smulsi3_highpart, STT_FUNC;
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137
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138 ___smulsi3_highpart:
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139 A1 = R1.L * R0.L (FU);
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140 A1 = A1 >> 16;
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141 A0 = R0.H * R1.H, A1 += R0.H * R1.L (IS,M);
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142 A1 += R1.H * R0.L (IS,M);
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143 A1 = A1 >>> 16;
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144 R0 = (A0 += A1);
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145 RTS;
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146 #endif
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